Tropics Trying to Come Alive in the Gulf of Mexico
Feb 6, 2012; 6:52 AM ET
The calendar says it's early February, but that is not stopping the tropics from trying to come alive in the southern Gulf of Mexico.
Watching Thunderstorms Near the Yucatan
AccuWeather.com meteorologists are closely monitoring an area of showers and thunderstorms in the south-central Gulf of Mexico, near the Yucatan Peninsula, for possible development Sunday afternoon. A weak area of low pressure is associated with the area of disturbed weather. Light wind shear and warm waters over the region could provide an environment in which the low pressure system develops into an organized sub-tropical or tropical storm, a scenario unusual for this time of the year.
Regardless of its exact development, the stormy weather will translate farther north and east through Monday to the Florida Keys and the southern Florida peninsula, resulting in periods of heavy rain.
Super Sunday tropical disturbance forms in Yucatan Channel
OK, this is officially nuts. The first Super Sunday Invest in history formed this morning in the Yucatan Channel between Mexico and Cuba, and is slowly becoming more organized as it moves northeast towards Southwest Florida. The new disturbance, dubbed Invest 90L
by NHC late this morning, has a modest but growing area of heavy thunderstorms near its center. Visible satellite imagery shows a pronounced spin at middle levels of the atmosphere, and 90L may be able to close off a surface circulation if it can find 24 more hours of marginally favorable conditions. Radar loops out of La Bajada
on the western tip of Cuba show heavy thunderstorms over Western Cuba, but there is no organization of the echoes into low-level spiral bands. Wind shear
is a high 20 - 25 knots, which is marginal for tropical storm formation. Ocean temperatures in the Yucatan Channel are 26 - 26.5°C (79 - 80°F), which is also marginal. 90L is suffering from ingestion of dry air along its western flanks, courtesy of an upper-level trough over the Gulf of Mexico, as seen on water vapor satellite imagery. Figure 1.
Is this football season or baseball season? The Super Sunday Invest 90L looks more characteristic of something we'd expect to see in May.Forecast for 90L
Both the GFS and ECMWF models predict that the shear will remain below 25 knots through Monday, so there is some potential for continued development of 90L as it moves northeast towards South Florida. On Monday afternoon or evening, the storm will merge with a cold front and move over South Florida, bringing heavy rains of 1 - 3 inches and sustained winds of 20 - 25 mph. If it develops into a tropical depression or tropical storm, which I put at a 20% chance, the winds and rains will be higher. I doubt 90L has enough time or favorable enough conditions to become a tropical or subtropical depression, especially considering the disturbance's small size. There is a historical precedent for a tropical storm this time of year in this location--the 1952 Groundhog's Day tropical storm
that hit Southwest Florida. According to Wikipedia, The 1952 Groundhog Day Storm was the only Atlantic tropical cyclone on record in the month of February. First observed in the western Caribbean Sea on February 2, it moved rapidly throughout its duration and struck southwestern Florida within 24 hours of forming. In the state, the winds damaged some crops and power lines, but no serious damage was reported.