Cloud Stalker: Tornado watch

Saturday, December 15, 2007

Tornado watch

TORNADO WATCH OUTLINE UPDATE FOR WT 739
NWS STORM PREDICTION CENTER NORMAN OK
940 PM EST SAT DEC 15 2007

TORNADO WATCH 739 IS IN EFFECT UNTIL 600 AM EST FOR THE
FOLLOWING LOCATIONS

FLC001-003-007-017-019-023-029-031-035-041-047-053-057-065-067-
069-075-079-081-083-089-101-103-107-109-119-121-123-125-127-
161100-
/O.NEW.KWNS.TO.A.0739.071216T0240Z-071216T1100Z/

FL
. FLORIDA COUNTIES INCLUDED ARE

ALACHUA BAKER BRADFORD
CITRUS CLAY COLUMBIA
DIXIE DUVAL FLAGLER
GILCHRIST HAMILTON HERNANDO
HILLSBOROUGH JEFFERSON LAFAYETTE
LAKE LEVY MADISON
MANATEE MARION NASSAU
PASCO PINELLAS PUTNAM
ST. JOHNS SUMTER SUWANNEE
TAYLOR UNION VOLUSIA

wish this was happening in the day so could chase it.

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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.