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Monthly Weather Summary, November 2018
National Meteorological Service of Belize
Monthly weather summaries are prepared by the climate section of the National Meteorological Service (NMS) of Belize. The NMS of Belize maintains a network of over 25 weather stations that are situated primarily in the agricultural regions of the country. Temperature and rainfall are read at 9 am each morning and the rainfall total read at this time represents the accumulated rainfall for the previous day.
November is the last month of the Atlantic basin hurricane season. For Belize it is a month in which the climate of the country transitions gradually from the rainy season to the cooler transition period between December and January. Therefore, it is a month in which the country is affected from both tropical systems such as tropical waves and possible tropical cyclones as well as frontal systems.
November 2018 started off generally fair. A cold front over the Gulf of Mexico and ridging northeast of the area supported a dry easterly to southeasterly airflow on the first day. This became a bit more easterly on day two as northern and inland portions of the country experienced a few showers and isolated thunderstorms due to the proximity of the front over northern Yucatan. Moisture increased further on the 3rd and 4th as the stationary front lingered just north of the area supporting a few showers and isolated thunderstorms across the country.
Conditions became generally fair once more on the 5th and 6th of the month as the remnants of the front drifted north and a drier easterly to east-southeasterly airflow dominated. Meanwhile a weak tropical wave was gradually approaching. On the morning of November 7th the axis of the tropical wave was located near 82W. The wave crossed late on the 7th into early morning on the 8th supporting a few overnight showers that lasted into the morning of the 8th.
The following few days from the 9th through to the 12th of November 2018 was characterized by generally fair weather with isolated showers. The upper levels in particular were very dry and hostile to any significant convective development during this period. A weak tropical wave crossed on the morning of November 11th but did not produce any significant increase in rainfall totals and only a modest increase in the coverage of isolated showers across the country.
The approach and passage of a cold front eventually ended the relatively dry spell described above. On the 13th, the front was located over the Bay of Campeche. Moisture convergence ahead of this system produced a few showers over inland and southern areas on that day with isolated thunderstorms during the night. Moisture increased further on the 14th as the front extended across northern Yucatan. A few showers and periods of rain affected mainly northern and inland areas on that day spreading to coastal areas during the night as the cold front crossed the country. The 15th was cloudy and cool in the wake of the cold front with light rain mainly offshore and over central parts of the country. The following day continued cloudy and cool but with little to no rainfall.
The remnants of the front in the form of a surface trof slowly began to drift back towards the country during the following few days. This supported rainfall activity mainly over the south and offshore areas at first. As a result the 17th was cloudy and cool with light rain mainly over the sea and along southern coastal areas. By the 18th, showers and periods of rain extended to central and southern areas with thunderstorms offshore.
Showery activity persisted and intensified somewhat during the following few days from the 19th peaking around the 21st and 22nd. It is worth noting that over 4 inches of rainfall was recorded at the Airport on the 21st which resulted in localized flooding in the area.
Rainfall activity gradually decreased on the 23rd and 24th with the weather becoming mostly fair on the 24th. Fair conditions persisted for the following two days (25th and 26th) as a dry southeasterly airflow prevailed over the area.
A cold front just north of northern Belize and a trof just east of the country changed weather conditions over the country on the 27th. These features supported an increase in moisture which resulted in a few overnight showers over the Toledo district and a few showers, thunderstorms and rain over the mainland and southern areas during the day. The front became stationary over central Belize on the 28th supporting cloudy and cool conditions with showers and light rain mainly over the sea and coast during the morning and then over central and northern areas in the afternoon. The frontal system retrogressed northward while slowly dissipating on the 29th producing showers and light rain over the Orange Walk and Corozal districts. By the 30th, the country saw a return to generally fair weather with only a few showers lingering over the north during the morning.
The graph and maps below summarize the total rainfall and average maximum and minimum temperature recorded during the month of November 2018. They also give an indication of how these readings compare to the normal for the month across the stations sampled. As can be seen, rainfall was generally normal for most of the southern two-thirds of the country. However, there are a couple exceptions. One is the west (Spanish Lookout and Central Farm area) where rainfall totals were around 25-55% above normal for the month and the other is the Stann Creek Valley (Pomona) area where totals were slightly below normal. No manual observations were available from the north at the time of this report. Preliminary (un-validated) data from automatic weather stations suggests that rainfall totals were significantly below normal in that area. In terms of maximum temperatures, most of the stations sampled here show above normal maximum/daytime temperature, except Central Farm where the average maximum temperature for the month was near normal and Savannah where the data suggests slightly cooler daytime temperature than normal. Nighttime/minimum temperatures were also slightly higher than normal for most areas except for Punta Gorda and Pomona.
Monthly Rainfall Summary
Monthly Maximum Temperatures
Monthly Minimum Temperatures
Rainfall Observed: November 2018 (mm)
Rainfall Observed: November 2018 (% Above/Below Average)