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Western Caribbean disturbance 96L close to tropical depression status

Jeff Masters

3:21 PM GMT on October 23, 2011

A region of disturbed weather in the Western Caribbean (Invest 96L) has become more organized this morning, and is close to tropical depression status. A hurricane hunter aircraft is scheduled to investigate 96L this afternoon at 2 pm EDT to see if a tropical depression has formed. The system is located just offshore from the Nicaragua/Honduras border, and is bringing heavy rains to northeastern Honduras. Visible satellite loops show that 96L is close to having a well-developed surface circulation, but the heavy thunderstorm activity is all on the west side of the center, due to a large region of dry air to the east. Wind shear is a moderate 10 - 20 knots due to strong upper-level winds out of the east, and these winds are injecting dry air into 96L's east side, keeping any heavy thunderstorms from developing on that side. Water temperatures are very warm, 29 - 30°C, and these warm waters extend to great depth.


Figure 1. Morning satellite image of 96L.

Forecast for 96L
I expect 96L will be able to organize into a tropical depression later today or on Monday, though this process will be slowed by the dry air to the storm's east, and perhaps by proximity to the land areas of Nicaragua and Honduras. NHC gave 96L a 60% chance of developing into a tropical depression by Tuesday in their 8 am Tropical Weather Outlook today. Steering currents favor a motion to the west-northwest or northwest, and it is likely that heavy rains from 96L will spread over Belize by Tuesday night, when the storm will probably be called Tropical Storm Rina. Heavy rains from the storm will spread over Mexico's Yucatan Peninsula, including Cozumel and Cancun, by Wednesday afternoon. On Wednesday, 96L will be encountering a dry airmass with high wind shear that lies over the extreme northwestern Caribbean. Since 96L is a small storm, these hostile conditions should cause the storm to weaken significantly before any potential landfall occurs.

More......


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navy "track", more like "area of action", at 11am

[Linked Image]

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tracking maps out now.....
[Linked Image]

[Linked Image]

Discussion and 48-hour outlook
------------------------------
at 500 PM EDT...2100 UTC...the center of Tropical Depression
Eighteen was located near latitude 15.9 north...longitude 81.9 west.
The depression is moving toward the northwest near 12 mph...19 km/h.
This general motion is expected to continue tonight...followed by a
turn toward the west-northwest on Monday. On the forecast track...
the center of the depression is expected to pass north of the
northeastern coast of Honduras during the next couple of days.

Maximum sustained winds are near 35 mph...55 km/h...with higher
gusts. Gradual strengthening is expected during the next day or
two and the depression is forecast to become a tropical storm
tonight or Monday.

The latest minimum central pressure reported by Air Force Reserve
reconnaissance aircraft was 1005 mb...29.68 inches.



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#419623 10/24/11 12:00 AM
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...DEPRESSION STRENGTHENS INTO A TROPICAL STORM OVER THE
NORTHWESTERN CARIBBEAN SEA...HEAVY RAINS AFFECTING NORTHEASTERN
HONDURAS...


SUMMARY OF 1100 PM EDT...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...16.4N 82.2W
ABOUT 115 MI...190 KM NE OF CABO GRACIAS A DIOS ON NIC/HON BORDER
ABOUT 210 MI...340 KM SSW OF GRAND CAYMAN
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...NNW OR 335 DEGREES AT 8 MPH...13 KM/H
MINIMUM CENTRAL PRESSURE...1004 MB...29.65 INCHES

If the forecast is right we will have a windy and rainy Thursday.

http://www.stormpulse.com/tropical-storm-rina-2011

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[Linked Image]

Tropical Storm Rina is forecast to strike Belize as a tropical storm at about 18:00 GMT on 27 October. Data supplied by the US National Hurricane Center suggest that the point of landfall will be near17.7 N,87.0 W. TS Rina is expected to bring 1-minute maximum sustained winds to the region of around 92 km/h (57 mph). Wind gusts in the area may be considerably higher.

NAVY TRACK:

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More info //ambergriscaye.com/forum/ubbthreads.php/topics/419626.html

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Tropical Storm Rina formed in the Western Caribbean Sea just off the coast of Honduras last night, and is headed north-northwest towards Mexico's Yucatan Peninsula.

Visible satellite loops show that Rina has had a respectable burst of thunderstorm activity with high, cold cloud tops this morning. This "Central Dense Overcast" (CDO) is characteristic of intensifying tropical storms that are a threat to reach hurricane strength. Rina has been bringing sporadic heavy rain squalls to the Cayman Islands over the past day; George Town on Grand Cayman Island had received 2.28" of rain and a peak wind gust of 31 mph as of 9 am EDT from the storm. Wind shear is a moderate 15 - 20 knots due to strong upper-level winds out of the southeast, and these winds are injecting dry air into Rina's southeast side, inhibiting heavy thunderstorm development there. Water temperatures are very warm, 29 - 30°C, and these warm waters extend to great depth. We don't have any surface wind reports from the vicinity of Rina; the closest buoy is Western Caribbean buoy 42057, about 60 miles east of Rina's center, which had top sustained winds out of the ESE at 29 mph this morning. We'll have to wait for the next hurricane hunter flight, scheduled for 2 pm this afternoon, to get a better idea of Rina's intensity.


Figure 1. Morning satellite image of Rina.

Forecast for Rina
The intensity forecast for Rina has a high amount of uncertainty. Rina should be able to slowly intensify through Tuesday, becoming a strong tropical storm. On Wednesday, Rina will be approaching a dry airmass with high wind shear that lies over the extreme northwestern Caribbean. Since Rina is a small storm, these hostile conditions could cause the storm to dissipate on Wednesday as it nears landfall over the Yucatan Peninsula, as predicted by the ECMWF and NOGAPS models. The completely opposite scenario is predicted by the GFDL and HWRF models, which forecast Rina will stay just south of the high shear/dry air region, and attain major hurricane status. The official NHC forecast of a Category 1 Hurricane Rina late this week is a reasonable compromise between these extremes. The track forecast for Rina also presents difficulties. A west-northwest to northwest motion towards the Yucatan Peninsula is likely through Wednesday. A trough of low pressure is predicted to pass to the north of Rina late this week, but the models are increasingly suggesting that Rina will not be far enough north to get caught up in the trough, but instead will remain trapped in the Western Caribbean. None of the latest 06Z (2 am EDT) model runs of the GFS, NOGAPS, GFDL, or HWRF models are predicting that Rina's center will make it north of Cuba during the next five days. In any case, heavy rains from Rina should begin affecting Mexico's Yucatan Peninsula, northern Belize, and extreme Western Cuba on Wednesday.

97L
A broad region of low pressure about 300 miles west of the southern Lesser Antilles Islands (Invest 97L), is moving west-northwest at 10 mph through the Caribbean Sea. This low has very limited heavy thunderstorm activity, due to dry air, and no signs of a surface circulation. NHC is giving 97L just a 10% chance of developing into a tropical depression by Wednesday. 97L is under low wind shear less than 10 knots, and this shear is expected to remain low through Thursday. By the time 97L reaches the region between Jamaica and Nicaragua in the Central Caribbean on Thursday or Friday, the storm should find a moister environment, and could develop into a tropical depression. The NOGAPS model predicts 97L could develop into a tropical depression by Saturday.

Jeff Masters


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All interests across the western Caribbean, including those of you in Belize, Cancun, Cozumel, western Cuba, should monitor the progress of this storm very closely
http://www.crownweather.com/?page_id=4557

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It is now Hurricane Rina...

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waaahh. Yet another storm messing up our halloween plans.

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