[LeArc] Special Weather Statement : MLI@ 8/11/02 5:49:33 AM

[learc@mailman.qth.net]

The following weather message is provided by McDonough County E.S.D.A.


WWUS35 KMLI 111053
SPSMLI
IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-009-
015>018-024>026-034-035-MOZ009-010-121001-

SIGNIFICANT WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
551 AM CDT SUN AUG 11 2002

...SIGNIFICANT CHANGES ON THE HORIZON...

TYPICAL SUMMERTIME HEAT AND HUMIDITY WILL BE FOUND TODAY. A WEAK FRONTAL
BOUNDARY DRAPED ACROSS THE AREA MAY SERVE AS THE FOCUS FOR ISOLATED
THUNDERSTORMS DURING THE MID TO LATE AFTERNOON. DUE TO THE
LACK OF DYNAMICS ALOFT...ANY THUNDERSTORMS THAT MAY DEVELOP ARE NOT
EXPECTED TO BECOME SEVERE. HOWEVER...DUE TO RELATIVELY WEAK WINDS
ANY THUNDERSTORMS THAT DEVELOP WILL BE FAIRLY SLOW MOVING AND WILL HAVE THE
POTENTIAL TO PRODUCE HEAVY RAINFALL OVER A SHORT PERIOD OF TIME.

TONIGHT INTO MONDAY MORNING...THE WEAK FRONTAL BOUNDARY IS EXPECTED TO
LIFT NORTH OF THE REGION. A STRENGTHENING LOW LEVEL JET WILL FOCUS
OVER THE AREA...AS THE FRONTAL ZONE LIFTS NORTH...BRINGING THE
THREAT OF SCATTERED SHOWERS AND THUNDERSTORMS...WITH LOCALIZED HEAVY RAIN
AGAIN POSSIBLE.

A BREAK IN THE RAIN IS EXPECTED BY MIDDAY ON MONDAY...THEN ADDITIONAL
SHOWERS AND THUNDERSTORMS WILL REDEVELOP BY LATE AFTERNOON.
A STRONG COLD FRONT IS EXPECTED TO MOVE INTO CENTRAL IOWA DURING THE
EARLY AFTERNOON. THUNDERSTORMS WILL BECOME MORE ORGANIZED ALONG AND AHEAD
OF THE FRONT AND MOVE EAST...AFFECTING LOCATIONS MAINLY ALONG AND
WEST OF A DUBUQUE TO CEDAR RAPIDS LINE BY LATE AFTERNOON.
STRONG UPPER LEVEL DYNAMICS COMBINED WITH MODEST HEATING AND MODERATE
INSTABILITY...WILL SET THE STAGE FOR THE POTENTIAL OF SEVERE THUNDERSTORMS.
DAMAGING STRAIGHT LINE WINDS AND LARGE HAIL WILL BE THE MAIN THREATS
ALONG WITH VERY HEAVY RAIN.

RAIN WILL LINGER OFF AND ON INTO TUESDAY EVENING...ESPECIALLY SOUTH
OF HIGHWAY 30...BEFORE EXITING TO THE EAST...AS COOL CANADIAN
HIGH PRESSURE BUILDS INTO THE AREA

STORM TOTAL RAINFALL AMOUNTS BY TUESDAY EVENING ARE EXPECTED TO BE BETWEEN
1 AND 1.5 INCHES OVER MANY AREAS...WITH THE POTENTIAL FOR AREAS
OF 2 TO 4 INCHES.

SPOTTER ACTIVATION IS NOT EXPECTED THROUGH TONIGHT...HOWEVER...ACTIVATION
WILL LIKELY BE NEEDED LATE MONDAY AFTERNOON WEST OF A LINE FROM
DUBUQUE...TO IOWA CITY...WITH ACTIVATION LIKELY OVER THE REST OF THE
AREA MONDAY EVENING.

SIGNIFICANTLY COOLER AND DRIER AIR WILL ARRIVE OVER THE AREA BY MIDWEEK.

MCCLURE

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