[LeArc] Special Weather Statement : MLI@ 4/20/02 6:16:23 AM

[learc@mailman.qth.net]

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


WWUS35 KMLI 201116
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
600 AM CDT SAT APR 20 2002

...RAIN AND SNOW DEVELOPING TONIGHT AND SUNDAY...

...SYNOPSIS...
A LARGE CANADIAN HIGH PRESSURE SYSTEM ACROSS THE NORTHERN GREAT LAKES
WILL CONTINUE TO PUSH COOLER AIR INTO THE REGION TODAY THROUGH
SUNDAY. A STRONG STORM SYSTEM WILL DEVELOP IN THE SOUTHERN PLAINS BY
THIS EVENING...AND THEN SKIRT EAST ALONG THE SOUTHERN EDGE OF THE
HIGH PRESSURE RIDGE. THIS LOW PRESSURE SYSTEM WILL MOVE ACROSS
MISSOURI THROUGH EARLY SUNDAY AFTERNOON...AND CONTINUE TO EAST
CENTRAL ILLINOIS BY SUNDAY EVENING. THIS STORM WILL DRAW UP PLENTY OF
MOISTURE FROM THE GULF OF MEXICO AND USE IT TO FUEL PRECIPITATION TO
THE NORTH OF IT OVER THE LOCAL AREA.

...THUNDERSTORMS LATE TONIGHT INTO SUNDAY...
ELEVATED THUNDERSTORMS EMBEDDED IN THE RAIN SHIELD WILL BE POSSIBLE
MAINLY ALONG AND SOUTH OF THE INTERSTATE 80 CORRIDOR AFTER MIDNIGHT.
THESE STORMS WILL LAST THROUGH EARLY SUNDAY AFTERNOON BEFORE SHIFTING
EAST. UPWARD VERTICAL MOTIONS INDUCED BY THE STRENGTH OF THE SYSTEM
AND DIFFLUENT FLOW ALOFT SUGGEST THESE STORMS MAY PRODUCE PEA SIZE TO
HALF INCH HAIL. SIGNIFICANT TO LOCALLY HEAVY RAIN AMOUNTS OF 1 TO 2
INCHES WILL BE POSSIBLE BY SUNDAY EVENING...CAUSING RISES ON AREA
RIVERS AND STREAMS.

...WINTRY MIX DEVELOPING LATE TONIGHT...
FARTHER TO THE NORTH...COLDER AIR IN THE LOWER LEVELS OF THE
ATMOSPHERE WILL BE PULLED INTO THE STORM...WITH THE RAIN EXPECTED TO
CHANGE OVER TO SNOW AND SLEET BY LATE TONIGHT. AREAS ALONG AND NORTH
OF A VINTON...TO STERLING LINE WILL BE MOST FAVORABLE TO EXPERIENCE
THE SLEET AND SNOW BY SUNDAY MORNING.

...POTENTIAL FOR ACCUMULATING SNOW SUNDAY...
THE SNOW WILL CONTINUE INTO SUNDAY NORTH OF A VINTON...TO MOUNT
CARROLL LINE. WITH THE WARMING OF THE DAY...THE SNOW IS EXPECTED TO
MIX WITH RAIN AND SLEET AT TIMES...BEFORE TRENDING BACK TO ALL SNOW
AGAIN BY LATE AFTERNOON. AT THIS TIME...DESPITE THE VERY WARM
TEMPERATURES THE PAST SEVERAL DAYS...THIS AREA MAY STILL EXPERIENCE 2
TO 4 INCHES OF WET SNOW STICKING MAINLY ON GRASSY SURFACES.  ON DOWN
TO THE INTERSTATE 80 CORRIDOR...THE RAIN WILL MIX WITH SNOW BY LATE
SUNDAY AFTERNOON BUT WARM SURFACES AND THE LATE CHANGEOVER SHOULD
RESULT IN LITTLE SNOW ACCUMULATIONS...MAINLY ON GRASSY SURFACES.

IF THE STORM SYSTEM TRACKS FARTHER NORTH THAN EXPECTED...THE
PRECIPITATION WILL BE MORE IN THE FORM OF RAIN AND REDUCE THE
ACCUMULATING SNOW POTENTIAL. CONVERSELY...IF THE STORM SYSTEM TRACKS
FARTHER SOUTH AND THE SNOW IS ABLE TO PERSIST SUNDAY AND SUNDAY
EVENING...AMOUNTS COULD REACH OR SURPASS 6 INCHES FROM VINTON TO
MOUNT CARROLL.

EMERGENCY MANAGERS...HIGHWAY DEPARTMENTS...AND GARDENERS ARE URGED TO
LISTEN TO LATER FORECASTS AND FOR POSSIBLE ADVISORIES REGARDING THIS
LATE WEEKEND STORM SYSTEM.

$$

12/33