[LeArc] Special Weather Statement : MLI@ 7/20/02 4:59:11 AM

[learc@mailman.qth.net]

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


WWUS35 KMLI 201000
SPSMLI
IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-009-
015>018-024>026-034-035-MOZ009-010-211000-

SIGNIFICANT WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
500 AM CDT SAT JUL 20 2002

...ISOLATED STORMS THIS AFTERNOON AND EVENING WITH DANGEROUS HEAT
AND STORMS ON SUNDAY...

A STATIONARY FRONT ACROSS SOUTHERN IOWA AND CENTRAL ILLINOIS WILL MOVE
BACK NORTH AS A WARM FRONT TODAY AND TONIGHT. FORCING ALONG THE FRONT
MAY BE SUFFICIENT COMBINED WITH DIURNAL HEATING AND MOISTURE TO ALLOW
ISOLATED THUNDERSTORMS TO DEVELOP THIS AFTERNOON AND EVENING. AT THIS
TIME ANY STORMS THAT DO DEVELOP ARE NOT EXPECTED TO BE SEVERE. IF
STORMS WOULD BECOME SEVERE...DAMAGING WIND WOULD BE THE MAIN
THREAT. BRIEF HEAVY DOWNPOURS ARE LIKELY.

ON SUNDAY...A DANGEROUS WEATHER SITUATION DEVELOPS WITH HEAT AND THEN
STORMS. SOUTH TO SOUTHWEST FLOW WILL BRING VERY HOT AND HUMID CONDITIONS
INTO THE REGION. TEMPERATURES IN THE MID TO UPPER 90S ARE EXPECTED WITH
DEW POINTS IN THE LOW TO MID 70S. THIS COMBINATION OF HEAT AND HUMIDITY
WILL PUSH HEAT INDICES INTO THE 105 TO 115 DEGREE RANGE...OR HIGHER.

A STRONG COLD FRONT IS FORECAST TO COLLIDE WITH THE EXTREME HEAT AND
HUMIDITY LATE SUNDAY AFTERNOON AND SUNDAY NIGHT. A FAVORABLE UPPER JET
POSITION AND LOW LEVEL JET WILL ALLOW SEVERE THUNDERSTORMS TO DEVELOP.

CURRENT INFORMATION SUGGESTS THAT A SQUALL LINE SHOULD DEVELOP ALONG OR
JUST AHEAD OF THE FRONT...WITH VERY HIGH WINDS...HAIL...AND HEAVY RAIN
THE MAIN THREATS. THIS SITUATION MUST BE MONITORED VERY CLOSELY...AS
THERE IS A POTENTIAL THAT VERY SEVERE THUNDERSTORMS COULD DEVELOP WITH
WINDS IN EXCESS OF 80 MPH. THE MOST LIKELY TIME PERIOD FOR SEVERE STORMS
WILL BE AFTER SUNSET INTO EARLY MONDAY MORNING.

EMERGENCY MANAGERS ARE STRONGLY URGED TO LISTEN TO LATER FORECASTS
REGARDING THE DANGEROUS HEAT AND STORMS EXPECTED SUNDAY. SPOTTER
ACTIVATION IS NOT ANTICIPATED THIS AFTERNOON OR EVENING...BUT IS LIKELY
SUNDAY NIGHT INTO MONDAY MORNING.

$$
86


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