[LeArc] Severe Thunderstorm Watch for Macomb, IL and Area

[Weather Underground Email Service]

Severe Thunderstorm Watch
urgent - immediate broadcast requested
Severe Thunderstorm Watch number 640
NWS Storm Prediction Center Norman OK
1230 PM CDT Thu Aug 23 2007

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

        northern and central Illinois
        Northwest Indiana
        extreme southern Wisconsin
        Lake Michigan

Effective this Thursday afternoon and evening from 1230 PM until
800 PM CDT.

Hail to 2 inches in diameter...thunderstorm wind gusts to 70
mph...and dangerous lightning are possible in these areas.

The Severe Thunderstorm Watch area is approximately along and 90
statute miles north and south of a line from 10 miles west
southwest of Moline Illinois to 30 miles east northeast of Meigs
Field Illinois.  For a complete depiction of the watch see the
associated watch outline update (wous64 kwns wou0).

Remember...a Severe Thunderstorm Watch means conditions are
favorable for 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. Severe thunderstorms can and occasionally
do produce tornadoes.

Discussion...convective system moving ewd across ern IA is expected
to progress enewd and intensify this afternoon.  MCS is in advance
of a short wave trough moving into extreme wrn IA...and is embedded
within a largely unidirectional wswly wind field with speeds of
40-50 kt above the pbl.  Visible imagery shows mainly clear skies
over IL and extreme srn WI ahead of the MCS which will allow
continued strong heating of very moist air mass.  Damaging wind
gusts and occasional hail will be possible with strongest cells as
they move enewd 35-40 kt.

Aviation...a few severe thunderstorms with hail surface and aloft
to 2 inches. Extreme turbulence and surface wind gusts to 60
knots. A few cumulonimbi with maximum tops to 500. Mean storm
motion vector 24035.


...Weiss

Expires:240100 gmt
;424,0904 432,0870 404,0870 401,0904


Severe Thunderstorm Watch
1228 PM CDT Thu Aug 23 2007
the National Weather Service has issued Severe Thunderstorm Watch
640 in effect until 8 PM CDT this evening for the following areas

In Illinois this watch includes 13 counties

In north central Illinois

Bureau                Putnam

In northwest Illinois

Carroll               Henry IL              Jo Daviess
Mercer                Rock Island           Stephenson
Whiteside

In west central Illinois

Hancock               Henderson             McDonough
Warren

This includes the cities of...Aledo...Carthage...Freeport...
Galena...Hennepin...Kewanee...Macomb...Moline...Monmouth...
Mount Carroll...Oquawka...Princeton...Rock Falls...
Rock Island and Sterling.

Expires:240100 gmt
VTEC:/O.NEW.KDVN.SV.A.0640.070823T1728Z-070824T0100Z/


-------------------------------------------------------
Amateur Radio Operator
Duane Whittingham - N9SSN
Skywarn, ARES/RACES, EMA/ESDA
Red Cross Volunteer & SATERN Member