Cloud Stalker: Dean update

Monday, August 20, 2007

Dean update

7:30 am
Monday, August 20, 2007

Eye of Category 4 Hurricane Dean Approaching the Southern Coast of Jamaica...Dean May Strengthen into a Category 5 Hurricane on Monday While Impacting Grand Cayman Island...Rough Surf and Rip Current Threat Increases in the Florida Panhandle Waters on Tuesday and Wednesday...Dean to Impact Mexico's Yucatan Peninsula on Tuesday...

At 2 PM EDT Sunday, the eye of Category 4 Hurricane Dean was located about 80 miles to the southeast of Kingston, Jamaica. Maximum sustained winds are near 145 mph, and Dean is moving towards the west-northwest around 18 mph. Hurricane warnings remain in effect for portions of Jamaica, the Cayman Islands, and the southern Haitian coastline. Hurricane watches have been posted for portions of Mexico's Yucatan peninsula. Tropical storm warnings and watches remain in effect for Haiti and Cuba.
The eye of Hurricane Dean will approach the southern Jamaican coast on Sunday evening. The official forecast from the National Hurricane Center maintains Dean on a west-northwest course during the next 5 days. Dean may strengthen into a Category 5 hurricane on Monday as the cyclone impacts Grand Cayman Island and moves over the very warm waters of the northwestern Caribbean Sea. Dean will take aim on Mexico's Yucatan peninsula by Tuesday before moving into the southwestern Gulf of Mexico. Please visit the National Hurricane Center's website for more details on Hurricane Dean.

Swells from Hurricane Dean will propagate towards the beaches of the Florida panhandle on Tuesday and Wednesday. Waves may reach the 5 to 7 foot range in the panhandle, and a high risk of rip currents is expected during this time frame. Floridians and visitors to the panhandle beaches should heed the advice of lifeguards and posted signs.

A strengthening ridge of high pressure positioned over the southeastern United States this week will result in more hot and unseasonably dry weather for Florida. Only isolated afternoon and evening thunderstorms are in the forecast, and heat indices could climb into the 105-110 degree range. Although heat-related advisories have not been issued, excessive heat safety should be practiced this week.

Like I said in my earlyer post it's gonna be Hot!
Stay in the shade if you can and drink plenty of water!
Have a great Monday if you can mine is already starting off yucky,with less then five hour sleep i see a nap after work today!
Jess

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HAIL (3/4 inch or greater)

Hail can cause significant damage to your vehicle, break windows and damage roofs of homes and businesses.
Hail can cause significant bodily injuries such as broken bones and even blindness if wind blown.
Softball (4.5 inches) sized hail was reported in Lake Wales, Florida on March 30, 1996.
Haildrifts, up to four feet deep of dime to nickel sized hail, occurred in low-lying areas near Zephyrhills, Florida on January 29, 1997.
Hailstones the size of softballs can fall at speeds faster than 100 mph

supercell

Supercells derive their rotation through tilting of horizontal vorticity (an invisible horizontal vortex) caused by wind shear. Strong updrafts lift the air turning about a horizontal axis and cause this air to turn about a vertical axis. This forms the deep rotating updraft, the mesocyclone.
A cap or capping inversion is usually required to form a downdraft of sufficient strength. The cap puts an inverted (warm-above-cold) layer above a normal (cold-above-warm) boundary layer, and by preventing warm surface air from sinking too far, allows one or both of the following:
Air below the cap warms and/or becomes more moist
Air above the cap cools
This creates a warmer, moister layer below a cooler layer, which is increasingly unstable (because warm air is less dense and tends to rise). When the cap weakens or moves, explosive development follows.
In North America, supercells usually show up on Doppler radar as starting at a point or hook shape on the southwestern side, fanning out to the northeast. The heaviest precipitation is usually on the southwest side, ending abruptly short of the rain-free updraft base or main updraft (not visible to radar). The rear flank downdraft, or RFD, carries precipitation counterclockwise around the north and northwest side of the updraft base, producing a "hook echo" that indicates the presence of a mesocyclone.