Cloud Stalker: Hello Dolly!!

Sunday, July 20, 2008

Hello Dolly!!

DOLLY HEADING TOWARD THE YUCATAN PENINSULA...

A TROPICAL STORM WARNING IS IN EFFECT FOR THE YUCATAN PENINSULA OF
MEXICO FROM THE BORDER WITH BELIZE TO CAMPECHE MEXICO. A TROPICAL
STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED
WITHIN THE WARNING AREA WITHIN THE NEXT 24 HOURS.

A TROPICAL STORM WATCH IS IN EFFECT FOR THE COAST OF BELIZE FROM
BELIZE CITY NORTHWARD TO THE BORDER WITH MEXICO. A TROPICAL STORM
WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE
WATCH AREA...IN THIS CASE WITHIN THE NEXT 12 TO 24 HOURS.

FOR STORM INFORMATION SPECIFIC TO YOUR AREA...INCLUDING POSSIBLE
INLAND WATCHES AND WARNINGS...PLEASE MONITOR PRODUCTS ISSUED
BY YOUR LOCAL WEATHER OFFICE.

AT 500 PM EDT...2100Z...THE CENTER OF TROPICAL STORM DOLLY WAS
LOCATED NEAR LATITUDE 18.9 NORTH...LONGITUDE 85.0 WEST OR ABOUT 220
MILES...350 KM...EAST OF CHETUMAL MEXICO AND ABOUT 165 MILES...265
KM...SOUTHEAST OF COZUMEL MEXICO.

DOLLY IS MOVING TOWARD THE NORTHWEST NEAR 14 MPH...22 KM/HR. A
NORTHWESTWARD OR WEST-NORTHWESTWARD MOTION IS FORECAST DURING THE
NEXT COUPLE OF DAYS...WITH A GRADUAL DECREASE IN FORWARD SPEED
EXPECTED BY TUESDAY. ON THIS TRACK...THE CENTER OF DOLLY WILL MOVE
ACROSS THE YUCATAN PENINSULA OF MEXICO TONIGHT...EMERGE OVER THE
SOUTHERN GULF OF MEXICO ON MONDAY...AND MOVE INTO THE SOUTHWESTERN
GULF ON TUESDAY.

DATA FROM AN AIR FORCE RECONNAISSANCE AIRCRAFT INDICATE THAT MAXIMUM
SUSTAINED WINDS REMAIN NEAR 45 MPH...75 KM/HR...WITH HIGHER
GUSTS. SLIGHT STRENGTHENING IS POSSIBLE TONIGHT BEFORE DOLLY
REACHES THE YUCATAN PENINSULA. GRADUAL STRENGTHENING IS FORECAST
ON MONDAY AND TUESDAY AFTER DOLLY EMERGES OVER THE SOUTHERN GULF OF
MEXICO.

TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 175 MILES...280 KM
FROM THE CENTER. DOLLY COULD PRODUCE WINDS NEAR TROPICAL STORM
FORCE...ESPECIALLY IN GUSTS...OVER THE WESTERN TIP OF CUBA TONIGHT.

THE MINIMUM CENTRAL PRESSURE RECENTLY REPORTED BY THE RECONNAISSANCE
AIRCRAFT WAS 1008 MB...29.77 INCHES.

DOLLY IS EXPECTED TO PRODUCE RAINFALL OF 4 TO 6 INCHES ACROSS THE
NORTHERN YUCATAN PENINSULA OF MEXICO AND WESTERN CUBA...WITH
ISOLATED MAXIMUM AMOUNTS UP TO 10 INCHES. AN ADDITIONAL 2 TO 4
INCHES IS EXPECTED IN THE CAYMAN ISLANDS...WITH A STORM TOTAL OF UP
TO 8 INCHES.

REPEATING THE 500 PM EDT POSITION...18.9 N...85.0 W. MOVEMENT
TOWARD...NORTHWEST NEAR 14 MPH. MAXIMUM SUSTAINED WINDS...45 MPH.
MINIMUM CENTRAL PRESSURE...1008 MB.

AN INTERMEDIATE ADVISORY WILL BE ISSUED BY THE NATIONAL HURRICANE
CENTER AT 800 PM EDT FOLLOWED BY THE NEXT COMPLETE ADVISORY AT 1100
PM EDT.

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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.