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August 1-? Severe Weather


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Ended up no further north than the state line, as this stuff congealed and merged in a hurry. We got underneath the shelf cloud and then played tag with it south for fifteen miles or so. Nice little backroad excursion. Max winds maybe 40 mph. No hail. Decent rain.

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Oh, to look out on Lake Michigan from the bluff at St. Joe!

THE NATIONAL WEATHER SERVICE IN NORTHERN INDIANA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

WESTERN CASS COUNTY IN SOUTHWEST MICHIGAN...

BERRIEN COUNTY IN SOUTHWEST MICHIGAN...

* UNTIL 930 PM EDT

* AT 829 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS

IN EXCESS OF 70 MPH. THESE SEVERE STORMS WERE LOCATED ALONG A LINE

EXTENDING FROM 16 MILES NORTHWEST OF ST. JOSEPH TO 15 MILES

NORTHWEST OF STEVENSVILLE TO 21 MILES NORTHWEST OF SHOREWOOD-TOWER

HILL...AND MOVING EAST AT 50 MPH.

* LOCATIONS IN THE PATH OF SEVERE THUNDERSTORMS INCLUDE...

ST. JOSEPH...

LAKE MICHIGAN BEACH...STEVENSVILLE AND SHOREWOOD-TOWER HILL...

COLOMA...PAW PAW LAKE AND BRIDGMAN...

WATERVLIET...

BUCHANAN AND BERRIEN SPRINGS...

DOWAGIAC...

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izzi update

MESOSCALE DISCUSSION...

720 PM CDT

NOTHING LIKE AN AFD TO CONVINCE STORMS TO NOT TAKE OFF...LINE OF

STORMS OVER NE IL HAS BEEN WEAKENING WITH TIME. LATEST ACARS

SOUNDINGS OUT OF ORD SHOW A NON-TRIVIAL CAP STILL PLACE...THOUGH

THE BASE OF THE INVERSION HAS LIFTED SIGNIFICANTLY WHICH IS LIKELY

AN INDICATION OF COOLING ALOFT DUE TO ASCENT. THE 00Z DVN SOUNDING

HAS JUST COME IN AND SHOWS A VERY IMPRESSIVE MLCAPE VALUE OF 6500

J/KG OF CAP WITH ONLY 31 J/KG OF MLCINH. SO WHILE THE STRONGER

LARGE SCALE ASCENT FROM WI SHORTWAVE APPEARS TO BE MOVING

OUT...HOWEVER CONVERGENCE ALONG THE FRONT HAS BEEN ENOUGH TO

ALLOW FOR TOWERING CBS TO BEGIN DEVELOPING OVER NW IL AND EVEN

RE-NEWED DEVELOPMENT OVER SOUTHERN WI.

GIVEN RECENT TRENDS IN RADAR AND VISIBLE SATELLITE IMAGERY

BECOMING INCREASINGLY CONCERNED ABOUT THE POTENTIAL FOR SEVERE

THUNDERSTORM DEVELOPMENT OVER NORTHWEST ILLINOIS ALONG THE

FRONT...WHICH WOULD THEN PUSH EAST-SOUTHEAST ACROSS THE CWA.

ON A SIDE NOTE...THE MOISTURE POOLING ALONG THE BOUNDARY IS VERY

IMPRESSIVE WITH TDS IN THE LOWER TO MID 80S OVER NW IL INTO

EASTERN IOWA. WITH TEMPS STILL NEAR 90 WILL PROBABLY END UP HAVING

TO EXTEND THE HEAT ADVISORY A FEW MORE HOURS FOR MUCH OF THE CWA.

IZZI

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