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#518100 - 10/08/16 04:27 AM Re: Monthly Weather Summary [Re: Marty]  
Joined: Oct 1999
Posts: 53,004
Marty Offline
Marty  Offline

Monthly Weather Summary, September 2016

National Meteorological Service of Belize

September 2016 in Belize was mostly moist, especially over the south and over inland areas. The first day started with a few showers and isolated thunderstorms over the south. On the second and third day, fair weather prevailed, with only isolated showers and isolated thunderstorms. On the second night, however, the south experienced a few more.

On the fourth day, a weak tropical wave approached the country. This wave was associated with moisture preceding it and so a few showers and thunderstorms affected the country on the fourth and fifth. The following two days were sunny and fair with isolated showers and isolated thunderstorms.

Another tropical wave affected the country on the eighth and ninth day. The north of the country experienced the bulk of the rainfall. Mainly fair weather followed on the tenth and eleventh day, except for afternoon hours, when inland areas experienced a few showers and thunderstorms.

On the twelfth, the country experienced early morning coastal showers and inland afternoon showers. That same night, another tropical wave crossed the country, spreading showers and thunderstorms around the country.

From the thirteenth to the twenty-first, relatively moist and unstable conditions supported a few showers and thunderstorms over the south and coast at night and over inland areas in the afternoons. Showers continued around the country on the twenty-second and twenty-third , when yet another tropical wave crossed the country.

Over the following three days, relatively moist and unstable conditions supported a few showers, thunderstorms and periods of rain around the country. On the twenty-eighth and twenty-ninth, another tropical wave approached and crossed the country, but supported no significant rainfall. However, on the last day of the month, an upper-level trough over the area, supported unstable atmospheric conditions. At the same time, low-level moisture increased and so the country experienced a few showers and thunderstorms.

In conclusion, the country experienced a relatively moist September in 2016. Five tropical waves were noted to have crossed the country, supporting showers and thunderstorms, except for one that produced no significant rainfall. Apart from these rain makers, moist and unstable conditions were the other supporting factors for the rainfall this month. Present data shows that this September rainfall fell within the normal range for this time of the year.

September 2016 in Belize was mostly moist, especially over the south and over inland areas. The first day started with a few showers and isolated thunderstorms over the south. On the second and third day, fair weather prevailed, with only isolated showers and isolated thunderstorms. On the second night, however, the south experienced a few more.

On the fourth day, a weak tropical wave approached the country. This wave was associated with moisture preceding it and so a few showers and thunderstorms affected the country on the fourth and fifth. The following two days were sunny and fair with isolated showers and isolated thunderstorms.

Another tropical wave affected the country on the eighth and ninth day. The north of the country experienced the bulk of the rainfall. Mainly fair weather followed on the tenth and eleventh day, except for afternoon hours, when inland areas experienced a few showers and thunderstorms.

On the twelfth, the country experienced early morning coastal showers and inland afternoon showers. That same night, another tropical wave crossed the country, spreading showers and thunderstorms around the country.

From the thirteenth to the twenty-first, relatively moist and unstable conditions supported a few showers and thunderstorms over the south and coast at night and over inland areas in the afternoons. Showers continued around the country on the twenty-second and twenty-third , when yet another tropical wave crossed the country.

Over the following three days, relatively moist and unstable conditions supported a few showers, thunderstorms and periods of rain around the country. On the twenty-eighth and twenty-ninth, another tropical wave approached and crossed the country, but supported no significant rainfall. However, on the last day of the month, an upper-level trough over the area, supported unstable atmospheric conditions. At the same time, low-level moisture increased and so the country experienced a few showers and thunderstorms.

In conclusion, the country experienced a relatively moist September in 2016. Five tropical waves were noted to have crossed the country, supporting showers and thunderstorms, except for one that produced no significant rainfall. Apart from these rain makers, moist and unstable conditions were the other supporting factors for the rainfall this month. Present data shows that this September rainfall fell within the normal range for this time of the year.

 

Station

September

Normal

Libertad

111.9

198.1

Towerhill

187.8

191.6

Philip Goldson Airport

160.7

258.8

Central Farm

88.6

177.4

Middlesex

246.5

354.8

Melinda

260.2

241

Spanish Lookout

130.8

174.4

Savannah Forest Stn       

393.9

365.3

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#519319 - 11/27/16 11:19 PM Re: Monthly Weather Summary [Re: Marty]  
Joined: Oct 1999
Posts: 53,004
Marty Offline
Marty  Offline

Monthly Weather Summary, October 2016

National Meteorological Service of Belize

The month of October saw below average rainfall for most stations as rainfall from tropical waves were limited. Weather conditions were affected by persistent low surface pressures over the southwestern and western Caribbean Sea and transient upper level Tutt lows.

A few showers occurred over the north and coast over-night into the 1st and over the mountains in the south during the daytime. The broad circulation of Category 4 Hurricane Matthew centered over the southeastern Caribbean dominated our weather during the first few days of the month. This supported a light and relatively dry northeasterly airflow during the 2nd through the 4th as Matthew moved north across the Caribbean towards western Hispaniola / Haiti and eastern Cuba. At upper levels a Tutt low over the western / central Caribbean moved west of our area by the 2nd and back east of our area by the 5th. This initially supported a convergent northwesterly flow aloft. However on the 2nd it supported isolated thunderstorms in the vicinity of the PGIA and the northern slopes of the Maya Mountains. Then by the 5th and the upper level northwesterly flow became a bit convergent. Weather conditions were mainly fair during the 7th, however during the 8th to 11th a relatively slack pressure gradient supported light winds and in a deep layer southerly flow with increasing upper level moisture, isolated thunderstorm developed in the south at night-time with showers and rain spreading across the country.

The upper levels became drier by Wednesday 12th due to a north-northwesterly flow from a ridge to the west. At low levels a surface trough across the northwestern Caribbean supported a north-northeasterly flow and mainly fair conditions through Thursday 13th. High resolution satellite imagery detected a cyclonic swirl of low clouds centered near 18N 84W and this produced showers over and offshore the south over-night and along the north coast and higher elevations inland during the daytime. This activity was supported by a weakly divergent westerly - southwesterly flow aloft from an upper level low south of western Cuba. This pattern of diurnal shower activity continued Through the 16th. During the 17th and 18th, light winds resulted in land breeze effect over-night. Showers developed mostly over the sea due to coastal convergence and shower activity affected the south and coastal areas during the night and early morning hours with additional activity developing inland and in the higher elevations at peak daytime heating hours. During the 19th showers moved from the sea to northern coastal areas. Then with the upper level high centered over the Gulf of Tehuantepec, the resulting northwesterly flow supported a drying trend through the 20th. Night-time / early morning showers were confined to mostly coastal waters during the 21st with isolated showers over the Maya mountains on the 22nd.

By the 23rd a cold front stalled over northern Yucatan with a shear-line developing between Hisopaniola and northeastern Nicaragua. Over our area a convergent / long fetch northeasterly flow developed, while at upper levels a trough extended down to the northwestern Caribbean with a ridge extending north from the eastern Pacific across Mexico and into the central United States. Afternoon showers affected mostly southern and inland areas, becoming generally isolated over-night into Monday 24th.

Remnant moisture from the dissipating frontal boundary drifted south and southwest from the northwestern Caribbean and supported mostly low-topped showers and periods of rain over most areas during the 25th. By the 26th a Tutt low was centered over Yucatan and provided support for a surface trough extending from the Bay of Campeche to the northwestern Caribbean Sea. Showers, periods of rain and isolated thunderstorms developed over and offshore northern and central areas of the country through the 27th. During the 28th a surface low over the northwestern Caribbean supported a northwesterly flow over our area and weather conditions turned out mainly fair with clear skies at night and little or no rainfall.

Cloudy conditions (layered low and high clouds) prevailed during the 29th and 30th with a moist southerly flow aloft and northwesterly low level flow which confined most showers and thunderstorms to coastal waters east of the reef. However by the evening, showers and thunderstorms developed from near SandHill south-southeastwards to just west of Dangriga and drifted westwards, with a few more developing over southern coastal waters during the night.


Station Total October 2016 Normal
Libertad 96 181.8
Tower Hill 79.2 178.6
Airport 128.9 281.9
Central Farm 131.8 205.1
Belmopan 121 209.6
Pomona 229.4 301.1
Melinda 190.1 287.3
Spanish Lookout 169.3 205.9
Savannah    290.6 277.5
Punta Gorda  232.2 346.6
SJC (Belize City) 178.6 259.6

#520577 - 12/30/16 11:50 PM Re: Monthly Weather Summary [Re: Marty]  
Joined: Oct 1999
Posts: 53,004
Marty Offline
Marty  Offline

Monthly Weather Summary, November 2016

National Meteorological Service of Belize

The month of November saw above average rainfall over central portions of the country; while the south and north saw below average, with the north well below. Two rain events, one at the begriming of the month and the other near the end, were primarily responsible for the greater than normal rainfall over central areas. Only one weak cold front crossed the country, and the predominant surface flow was from the northeast. No new temperature record was set.

The month started out with some rain. A surface trof that extended from Belize eastward was the focus for showers and thunderstorms during the first two days, especially in the nights. The moisture was high and the upper pattern diffluent, with an upper anticyclone centered over our area. Belize City received more than four inches of rain on the 2nd, while San Pedro and some central stations got more than two inches. The next three days (3rd,4th,5th) saw a few showers over some areas, as the trof drifted south and dissipated and a moderate northeast surface flow, supported by a ridge over the western Gulf of Mexico, prevailed. The upper pattern was neutral. The moisture decreased and showers were isolated from the 6th to the 8th. A broad low level trof over the central Caribbean Sea resulted in a light northeast airflow over the northwest Caribbean and Belize.

From the 9th to the 12th a few showers developed mainly in a diurnal manner; ie mostly inland during the daytime and over the coast at night. A light north-northeast airflow was supported by a surface trof over the NW Caribbean Sea just east of Belize and a ridge over southern Mexico. Some southern coastal stations recorded one to two inches on the 11th and 12th. A decrease in available moisture resulted in mainly fair weather, with only isolated showers, on the 13th, then a few showers over the south the next day. It was mostly sunny on the 15th with little or no rain. A light northerly airflow prevailed and a weak cold front reached NW Yucatan. The cold front crossed Belize the next day with a few showers and light rain developing mainly over central and southern districts. Rainfall was minimal with this front, and mostly less than one quarter of an inch. The 17th and 18th saw isolated showers mainly over the south, as a northeast airflow prevailed. A broad low pressure area developed over the SW Caribbean Sea east of Nicaragua and high pressures dominated the Gulf of Mexico. The flow backed to the NNE the next two days (19th, 20th) and mainly fair weather prevailed over the mainland, while a few showers developed over the sea. The moisture was relatively low and the upper pattern generally convergent.

Skies became cloudy on the 21st with a few showers and light rain over central and southern areas, as tropical storm Otto formed east of Nicaragua. Otto would remain almost stationary, become a hurricane, then cross over southern Nicaragua on the 24th. Meanwhile, a few showers prevailed over the country through the 24th, except on the 22nd, when showers were isolated. Melinda recorded four and one half inches of rain on the 24th. High pressures dominated the Gulf of Mexico and north-easterlies prevailed over Belize over these days, as another cold front reached northern Yucatan on the 21st, then moved east without crossing Belize. Skies became overcast on Friday 25th with frequent showers and periods of rain over most areas. A moist north-northeasterly airflow, that was convergent over and just east of Belize, prevailed. Rainfall was heaviest along the coast and over the south. Belize City recorded more than four inches of rain for 25th, and some streets were flooded all day. The next day, showers and rain decreased during the morning, to become generally isolated by evening. The moisture decreased and winds became northeast by Sunday 27th and showers remained isolated. The flow then veered to the southeast during the last three days and the moisture decreased, which supported only isolated showers. The surface ridge moved east and out of the Gulf of Mexico, while low pressures developed over the western Gulf and NE Mexico/ Bay of Campeche ahead of a cold front that entered the NW Gulf of Mexico the last day of the month.


#520913 - 01/15/17 11:44 PM Re: Monthly Weather Summary [Re: Marty]  
Joined: Oct 1999
Posts: 53,004
Marty Offline
Marty  Offline

Monthly Weather Summary, December 2016

National Meteorological Service of Belize

Climatology shows that the main features influencing weather across the country of Belize in December are cold fronts, upper level troughs and the development of moist northeasterly airflows in the area. There was no frontal passage in December of 2016. However, rainfall was above normal for most areas and this was caused by a rather moist tropical air mass that affected the country. Additionally, an upper level ridge persisted over the southwest Caribbean for a major part of the month. This blocked the fronts from entering the area and also supported instability aloft which resulted in deep convection over the area particularly on the 26th of the month.

On the first day of December a marginally moist and light easterly airflow over the area supported cloudy skies at times with a few showers mainly over northern coastal areas of the country. A slack pressure pattern dominated from the 2nd through to the 3rd and moisture also decreased over the area. This supported mainly fair conditions with only isolated showers across the country. The flow veered even further to the east-southeast on the 4th and 5th supporting mainly fair, warm and mostly dry weather. Similar weather continued on the 6th but isolated showers affected inland areas on that day.

In response to a cold front that descended into the Bay of Campeche on the 7th and later became stationary over extreme northern Yucatan, the surface flow backed to the east on the 7th and then to the east-northeast on the 8th through to the 11th. This resulted in a gradual increase in moisture over the area. While the 7th was still mainly fair with only isolated showers, the 8th became cloudy at times with a few showers across the country and similar weather persisted through to the 11th of the month.

Moisture would increase further on the 12th as a trof developed over the western Caribbean linked to a low pressure system crossing Nicaragua. This resulted in cloudy skies with a few showers and periods of rain. The trof was almost over the country on the 13th causing a moist northeasterly surface flow to develop. Furthermore, the upper levels were quite divergent and this supported cloudy skies with several showers, periods of rain and thunderstorms over the country. This was the first major rainfall event for the month resulting in rainfall totals of over an inch in the Belize City, Ladyville and the San Pedro Area. Conditions continued moist and unstable on the 14th but rainfall occurred mostly in the south that day with Punta Gorda receiving about an inch of rainfall.

Moisture decreased on the 15th and 16th but a few showers still affected southern and central areas of the country. Improvements continued on the 17th as the flow veered more to the east and by the 18th a dry easterly to southeasterly flow supported mainly fair conditions with only isolated showers.

The surface flow shifted abruptly to the east-northeast on the 19th as a cold front entered the central Gulf of Mexico. Additionally, the flow was convergent and gusty over the area. This factor coupled with an increase in moisture supported cloudy skies at times with a few showers across the country on the 19th and 20th of the month. Additionally, a broad trof developed over the northwest Caribbean on the 20th and persisted through to the 21st. Therefore, the gusty northeasterly flow persisted but showers decreased on the 21st. By the 22nd conditions were mainly fair with only isolated showers. Conditions continued relatively dry over the area on the 23rd but moisture increased later in the night resulting in an increase in showers.

Conditions were relatively moist on the 24th and 25th resulting in cloudy skies at times with a few showers. These occurred mostly in the south on Christmas Day. Weather conditions deteriorated further on the 26th as an upper ridge east of the area coupled with trofing to the west supported a divergent and moist South-Southwesterly flow aloft. Skies were cloudy to overcast that day with some showers, thunderstorms and periods of rain over most areas. This was the second major rainfall event for the month. Belmopan in the west and Kendall in the south recorded almost an inch and a half of rainfall.

Relatively moist conditions persisted over the area from the 27th through to the 29th although the upper levels had become less divergent. The result was cloudy skies at times with a few showers mainly over central and southern areas. Moisture decreased further on the 30th and 31st resulting in partly cloudy skies with shower activity becoming generally isolated.

The graph and maps below show the rainfall recorded in December 2016 versus the climatological mean for the month for a few of the weather stations across the country. These graphics show most stations recorded above average rainfall except for those in the western Cayo District that recorded below average.





#521447 - 02/07/17 11:44 PM Re: Monthly Weather Summary [Re: Marty]  
Joined: Oct 1999
Posts: 53,004
Marty Offline
Marty  Offline

Monthly Weather Summary, January 2017

National Meteorological Service of Belize

January 2017 started out with beautiful weather. For the first three days, a dry south-easterly flow prevaile, which supported little or no rainfall. On the fourth day, only isolated showers were observed, followed by the fifth and sixth, experiencing fair conditions.

On the seventh, the country experienced pre-frontal activity. Showers and thundershowers were observed, followed by the passage of a cold front.  The eight day met dry and gusty conditions. Wind speeds ranged between fifteen and thirty knots.  On the ninth, wind speeds abated, but dry conditions continued. However, a few showers were observed around the country during the night.

From the tenth through to the seventeenth, a series of high pressure ridges traversed the Gulf of Mexico and the Northwest Caribbean Sea.  These supported and maintained a relatively moist north-easterly flow across Belize. The country experienced light showers each and every day during this period.

Conditions changed with the onset of a dry east to south-easterly flow from the eighteenth to the twenty-first. Once again, fair conditions prevailed with little or no rainfall.

On the twenty-second night, another cold front crossed the country. This time, pre-frontal activity was minimal. Only the Corozal District experienced light isolated showers.

From the twenty-third to the twenty-seventh, fair, cool and dry conditions prevailed. The twenty-eight was met with isolated showers , followed by a few showers on the twenty-ninth, with the passage of a third cold front. The thirtieth was dry and windy, while the last day was cool and dry.

In conclusion, observation showed three cold fronts crossed Belize during January, 2017. Only the first was accompanied by a few thundershowers. Rainfall data collected indicated that rainfall for this month  was below normal. 


Station Total January 2017 Normal
Libertad 47.3    59.4
Towerhill 35.4    72.4
Airport 71.7    98.3
Belmopan 82.8    125
Central Farm 87.7    115.6
Spanish Lookout 54.6    93.4
Melinda 120.4 157.9
Pomona 70.9 162.7
Savannah    119.7 135.7

#522422 - 03/20/17 04:30 AM Re: Monthly Weather Summary [Re: Marty]  
Joined: Oct 1999
Posts: 53,004
Marty Offline
Marty  Offline

Monthly Weather Summary, February 2017

National Meteorological Service of Belize

February 1st 2017 saw a light easterly surface flow prevailing, while at upper levels a trough east of our area supported a convergent / subsident northwesterly flow over our area. Mostly cloudy skies prevailed with little or no rainfall over the mainland, while a few showers over central coastal waters early, drifted on-shore with a few more developing inland during the afternoon and and over-night into the 2nd. Light winds supported some coastal convergence and isolated early morning showers into the 3rd. During the next few days through 13th an east-northeasterly flow supported low level moisture through the lower 10,000ft and night-time / early-morning showers occurred over the south and some central areas of the country.

Mainly fair, warm and dry weather prevailed during Tuesday 14th through Monday 20th as the upper level pattern continued convergent / subsident and a light to moderate east-southeasterly surface / low level flow developed. During the 15th and 16th a frontal boundary was positioned over the Bay of Campeche and a pre-frontal shear-line drifted across Yucatan - Guatemala and northern Belize over-night but supported only isolated showers in the northwesterly flow along with isolated afternoon showers resulting from day-time heating over the Maya Mountains. The shear-line rapidly weakened as it retrogress over the area with the southeasterly flow returning. Upper level moisture increased during Friday 17th as a trough moved nearer our area, while a cold front stalled across central Yucatan then retrogressed and dissipated while the east-southeasterly surface / low level flow continued to dominate.

By the 20th a deep layer trough to the west and northwest supported rapid deepening of a surface low over Texas / Louisiana. the low ejected across he southeastern United States with the associated cold front swinging east and sotheast to Yucatan by the 22nd, while a pre-frontal triough drifted over our area and into the northwestern caribbean sea. The relatively weak frontal boundary would eventually drift over the extreme Northwest Caribbean by Wednesday 22nd, while the associated shear-line continued southeast to southern Costa Rica / Panama. Few showers affected the south during the afternoon / evening of the Tuesday 21st and the northern / central areas through early night-time. A few more showers developed over the northern districts over-night into the 22nd and drifted eastwards to coastal waters by day break. early morning temperatures were slightly cooler where as relatively warm daytime temperatures occurred during Wednesday 22nd through Friday 24th.

An east-southeasterly airflow supported mainly fair weather during 23rd and 24th with isolated afternoon thunderstorms developing over the Maya Moutains during the 25th. By the 26th broad troughing developed over the Northwest Caribbean and supported an east-northeasterly flow. The trough sheared northwestward across Yucatan and the flow veered to the southeast by the 26th with insignificant increase in moisture and shower activity. Mainly fair weather continued during Monday 27th and Tuesday 28th.


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