Area Forecast Discussion
Issued by NWS Central Illinois

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000
FXUS63 KILX 231729
AFDILX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
1229 PM CDT SAT MAY 23 2015

.UPDATE...
ISSUED AT 952 AM CDT SAT MAY 23 2015

UPDATED THE FORECAST TO INCREASE THE AMOUNT OF SUNSHINE. LATEST
SATELLITE IMAGERY SHOWING MOSTLY CLEAR SKIES NORTH OF I-72...BUT
WIDESPREAD CLOUDS CONTINUE TO MOVE EASTWARD TOWARD THE MISSISSIPPI
RIVER. THESE SHOULD MAKE SOME INTO THE WESTERN PARTS OF THE
FORECAST AREA BY EARLY AFTERNOON...SPREADING EAST THE REST OF THE
DAY. TEMPERATURES ONLY REQUIRED SOME MINOR EDITS AND SHOULD STILL
TOP OUT IN THE 80 DEGREE VICINITY OVER THE AREA.

&&

.SHORT TERM...(TODAY)
ISSUED AT 342 AM CDT SAT MAY 23 2015

HIGH PRESSURE CENTERED WELL EAST OF THE AREA WILL STILL HAVE
SOME INFLUENCE ON THE WEATHER ACROSS THE AREA TODAY...WITH DRY AND
WARM CONDITIONS. UPPER LEVEL LOW PRESSURE AREA IN THE SOUTHWEST US
WILL KEEP SOUTHWEST FLOW ACROSS THE PLAINS AND MID LEVEL RIDGING
OVER THE MIDWEST. MID AND UPPER LEVEL MOISTURE ASSOCIATED WITH ANY
LITTLE WAVE IN THE SOUTHWEST FLOW WILL LIFT NORTHEAST BUT REMAIN
WEST OF THE AREA. CLOUDS ASSOCIATED WITH ANY OF THESE WAVES WILL
CONTINUE TO SPREAD ACROSS THE CWA TODAY. CLOUDS USUALLY KEEP TEMPS
ON THE COOLER SIDE...BUT WITH SOUTHERLY WINDS TO COMPENSATE FOR THE
CLOUDS...AND 850MB TEMPS SAME AS YESTERDAY...EXPECTING HIGH TEMPS
TODAY TO BE AROUND THE SAME AS YESTERDAY...UPPER 70S TO AROUND 80.

.LONG TERM...(TONIGHT THROUGH FRIDAY)
ISSUED AT 342 AM CDT SAT MAY 23 2015

HIGH PRESSURE RIDGE LOSING GROUND TO APPROACHING SYSTEM FROM THE
WEST.  TONIGHT EXPECTED TO BE A LITTLE WARMER AS CLOUD COVER AND A
SOUTHERLY COMPONENT TO THE WINDS OVERNIGHT LIMIT THE AMOUNT OF
COOLING.  PRECIP FROM THE APPROACHING STORM HAS BEEN WAVERING WITH
ITS ARRIVAL TIME GOING SLOWER ON 00Z RUNS AND FASTER WITH THE 12Z
RUNS OF OPERATIONAL MODELS.  TONIGHT WAS NO DIFFERENT SLOWING THE
ONSET OF PRECIP IN THE FAR WESTERN PORTIONS OF THE CWA UNTIL RIGHT
AROUND 12Z SUN MORNING. SOUTHERLY FLOW CONTINUES TO FEED WARM AIR
AND MOISTURE UP INTO THE REGION AND THE MODELS KEEP THE PRECIP IN
FOR A WHILE WITH A MORE ACTIVE SOUTHWESTERLY FLOW ALOFT.  BETTER
CHANCES FOR PRECIP ACCOMPANY THE MAIN ENERGY MOVING INTO THE MIDWEST
SUN NIGHT AND INTO MONDAY.  MODELS HAVE PRETTY GOOD CONTINUITY WITH
A DRY SLOT DEVELOPING MONDAY AFTERNOON AND INTO THE OVERNIGHT HOURS,
AND HAVE PULLED BACK THE POPS FOR THAT TIME FRAME ACCORDINGLY,
THOUGH NOT ENTIRELY READY TO PULL THEM OUT COMPLETELY WITH THE
POTENTIAL FOR ANY CLEARING REENERGIZING THE ATMOSPHERE FOR AFTERNOON
CONVECTION ON ANY MESOSCALE BOUNDARY.

IN THE LONGER TERM, FORECAST CONTINUES WARM AND RAINY WITH
UNSETTLED WEATHER ON THE EDGE OF WEAK SOUTHWESTERLY FLOW ALOFT.
MIDWEST REMAINS IN THE PATH OF SEVERAL VORTS MOVING OUT OF THE
DEEPER LOW/TROF SITTING OVER THE SOUTHWESTERN CONUS. DEEP LAYER
SHEAR STILL LIMITED WITH WEAK FLOW ALOFT, BUT HOT AND MUGGY AIRMASS
WILL CONTINUE TO FEED INTO THE REGION AND MODELS ARE MORE THAN
GENEROUS WITH THE CONVECTION THROUGH THE END OF THE FORECAST.  THAT
BEING SAID, WED NIGHT THROUGH THU NIGHT REMAIN THE LOWEST POPS IN
THE FORECAST WITH A WEAK RIDGE BRIEFLY MOVING IN BETWEEN SYSTEMS.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z SUNDAY AFTERNOON)
ISSUED AT 1230 PM CDT SAT MAY 23 2015

VFR CONDITIONS EXPECTED THROUGH THE TAF PERIOD. HAVE SEEN SOME
RECENT DIURNAL CUMULUS DEVELOPMENT AROUND 6500 FEET...BUT GENERAL
TREND WILL BE FOR CEILINGS NEAR 10K TO GRADUALLY LOWER TONIGHT
FROM WEST TO EAST. WINDS START TO PICK UP OUT OF THE SOUTH BY MID
MORNING SUNDAY AND BECOME GUSTY BY LATE MORNING. HAVE ADDED SOME
VCSH TO KPIA/KSPI LATE MORNING...BUT THINK THAT MOST LOCATIONS
WILL REMAIN DRY UNTIL AFTER 18Z.

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

UPDATE...GEELHART
SHORT TERM...AUTEN
LONG TERM...HJS
AVIATION...GEELHART



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