[LeArc] Tornado Watch for Macomb, IL

[Weather Underground Email Service]

Tornado Watch
urgent - immediate broadcast requested
Tornado Watch number 619
NWS Storm Prediction Center Norman OK
1055 am CDT Tue Jul 13 2004

The NWS Storm Prediction Center has issued a
Tornado Watch for portions of

Eastern Iowa
northern and central Illinois

Effective this Tuesday morning and afternoon from 1055 am until
500 PM CDT.

Tornadoes...hail to 3 inches in diameter...thunderstorm wind gusts
to 80 mph...and dangerous lightning are possible in these areas.

The Tornado Watch area is along and 85 statute miles east and west
of a line from 30 miles east northeast of Dubuque Iowa to 15 miles
southwest of Bloomington Illinois.

Remember...a Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings.

Discussion...extreme instability ern IA spreading into IL ahead of
vigorous upper trough.  Rapid severe thunderstorm development will
occur ahead of cold front across nern IA/nwrn IL. 40-50kt of deep
layer shear coupled with mucapes above 5000 j/kg will support
supercells which will enhance large hail and tornado threat.

Aviation...tornadoes and a few severe thunderstorms with hail
surface and aloft to 3 inches. Extreme turbulence and surface wind
gusts to 70 knots. A few cumulonimbi with maximum tops to 600.
Mean storm motion vector 30030.


...Hales

;423,0883 401,0873 401,0904 423,0915;



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