[LeArc] Severe Thunderstorm Watch for Macomb, IL

[Weather Underground Email Service]

Severe Thunderstorm Watch
urgent - immediate broadcast requested
Severe Thunderstorm Watch number 596
NWS Storm Prediction Center Norman OK
245 am CDT Tue Aug 14 2007

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

        eastern Iowa
        northern and central Illinois

Effective this Tuesday morning from 245 am until 700 am CDT.

Hail to 1.5 inches in diameter...thunderstorm wind gusts to 80
mph...and dangerous lightning are possible in these areas.

The Severe Thunderstorm Watch area is approximately along and 75
statute miles either side of a line from 40 miles west of
Burlington Iowa to 35 miles south southeast of Rockford Illinois.
  For a complete depiction of the watch see the associated watch
outline update (wous64 kwns wou6).

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.

Other watch information...continue...ww 595...

Discussion...Bow echo over swrn WI continues to move ssewd at 40-50
kt.  Activity is following ern edges of instability gradient where
MLCAPE is 1000-2000 j/kg /MUCAPE of 2000-3000 j/kg/.  Bow should be
the main activity over the next several hours.  Activity over S
central WI is expected to move into air mass with lower dewpoints
that are in the mid/upr 50s.

Aviation...a few severe thunderstorms with hail surface and aloft
to 1.5 inches. Extreme turbulence and surface wind gusts to 70
knots. A few cumulonimbi with maximum tops to 450. Mean storm
motion vector 32040.


...McCarthy

Expires:141200 gmt
;415,0922 425,0891 404,0883 394,0913