91L Grows into TD1; Will Bring Heavy Rains to Florida and the Bahamas ~Dr. Jeff Masters, Weather Underground

Posted on June 30, 2014 By

Here we go! Hurricane Season is afoot. So is Flood Season up north. Down here in New Orleans, heat and humidity cover the city like a wide cotton bed sheet. ~Bruce Biles

An area of disturbed weather over the warm waters of the Gulf Stream, about 230 miles east of Jacksonville, Florida (Invest 91L) has grown more organized since Saturday, and is a threat to develop into a tropical depression early this week. Satellite loops on Sunday morning showed 91L with only a modest amount of heavy thunderstorm activity, but the system had a pronounced spin, and the heavy thunderstorms were organizing into spiral bands. Long-range radar out of Melbourne, Florida showed two of these bands about 75 – 150 miles east of the Central Florida coast. Sea surface temperatures in this region were about 1°C above average, 27 – 28°C–plenty of heat energy for a developing tropical cyclone. Wind shear was light, 5 – 10 knots, but was enough to keep any heavy thunderstorms from developing on the north side of 91L. Water vapor satellite loops showed some modest patches of dry air to the north of 91L, and this dry air was retarding development on Sunday morning. The Hurricane Hunters are on call to investigate 91L on Sunday afternoon. Read more.

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