Area Forecast Discussion
Issued by NWS Central Illinois

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FXUS63 KILX 020807
AFDILX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
307 AM CDT WED SEP 2 2015

.SHORT TERM...(TODAY)
ISSUED AT 307 AM CDT WED SEP 2 2015

UPPER RIDGE ORIENTED FROM THE SOUTHERN PLAINS TO THE EASTERN GREAT
LAKES WILL CONTINUE TO BE THE DOMINANT WEATHER FEATURE ACROSS
CENTRAL ILLINOIS TODAY...PROVIDING MOSTLY SUNNY AND HOT CONDITIONS.
VIGOROUS SHORT-WAVE THAT HAS TRIGGERED SCATTERED HEAVY DOWNPOURS
ACROSS PORTIONS OF EAST-CENTRAL ILLINOIS OVER THE PAST TWO DAYS HAS
SHIFTED FURTHER EAST INTO OHIO AND WILL NOT BE A FACTOR.
MEANWHILE...A SECOND WAVE ACROSS SOUTHERN MINNESOTA WILL STAY WELL
TO THE N/NW OF THE AREA.  MAY SEE SOME HIGH/THIN CLOUDS FROM
CONVECTIVE DEBRIS ASSOCIATED WITH THIS FEATURE...BUT OVERALL SKY
CONDITION WILL REMAIN MOSTLY SUNNY. HIGH TEMPERATURES WILL BE
SIMILAR TO YESTERDAY...MAINLY IN THE LOWER 90S.

&&

.LONG TERM...(TONIGHT THROUGH Tuesday)
ISSUED AT 307 AM CDT WED SEP 2 2015

MINNESOTA SHORT-WAVE TROUGH WILL TRACK E/NE ACROSS WISCONSIN
TODAY...THEN WILL DROP SOUTHEASTWARD INTO MICHIGAN/NORTHERN INDIANA
ON THURSDAY.  WITH THIS PARTICULAR TRACK...ANY ASSOCIATED CONVECTION
SHOULD STAY MAINLY TO THE N/NE OF THE AREA...HOWEVER LOCATIONS
ALONG/NORTHEAST OF I-74 COULD POTENTIALLY SEE AN ISOLATED
THUNDERSTORM THURSDAY AFTERNOON/EVENING.  THE NAM CONTINUES TO BE
THE MOST AGGRESSIVE WITH PRECIP FURTHER SOUTH INTO PORTIONS OF THE
KILX CWA...WHILE THE LATEST ECMWF KEEPS THE CONVECTION MUCH FURTHER
NORTH ACROSS MICHIGAN.  THINK A MIDDLE-OF-THE ROAD APPROACH IS BEST
HERE...WITH SHOWERS/THUNDER REMAINING JUST N/NE OF THE CWA.  HIGH
TEMPERATURES WILL ONCE AGAIN REACH THE LOWER 90S.

THE UPPER RIDGE WILL REMAIN IN PLACE ACROSS THE REGION THROUGH THE
WEEKEND...ENSURING A CONTINUATION OF VERY WARM AND LARGELY DRY
CONDITIONS.  AN ISOLATED THUNDERSTORM CANNOT COMPLETELY BE RULED OUT
ON ANY PARTICULAR DAY...HOWEVER SYNOPTIC FORCING WILL REMAIN WEAK AT
BEST...SO WILL MAINTAIN A DRY FORECAST WITH HIGHS IN THE LOWER
90S THROUGH SUNDAY.

AFTER THAT...THINGS GET A LITTLE MORE INTERESTING AS THE RIDGE
GRADUALLY BEGINS TO BREAK DOWN.  MODELS ARE STRUGGLING WITH THE
PATTERN CHANGE...WITH THE GENERAL TREND SUGGESTING A SLOWER
WEAKENING OF THE RIDGE AND A DELAYED ARRIVAL OF A COLD FRONT.  THINK
00Z SEP 2 ECMWF MAY HAVE THE MOST REASONABLE HANDLE ON THE
SITUATION...SHOWING A DEEP UPPER LOW DIVING INTO THE PACIFIC
NORTHWEST THIS WEEKEND THEN LIFTING INTO SOUTHERN CANADA EARLY NEXT
WEEK.  THIS WILL PUSH A DISSIPATING COLD FRONT INTO CENTRAL ILLINOIS
ON MONDAY.  DUE TO HIGH UPPER HEIGHTS AND WEAK CONVERGENCE ALONG THE
BOUNDARY...WILL ONLY CARRY SLIGHT CHANCE POPS WITH HIGHS IN THE
UPPER 80S TO AROUND 90 ON MONDAY.  THE ECMWF THEN SHOWS ANOTHER
STRONG SHORT-WAVE TRACKING SOUTHEASTWARD OUT OF WESTERN CANADA NEXT
WEEK THAT WILL EVENTUALLY PUSH A STRONGER COLD FRONT INTO THE
REGION.  TIMING REMAINS IN QUESTION...BUT IT APPEARS FROPA WILL
OCCUR DURING THE TUESDAY/WEDNESDAY TIME FRAME.  WILL THEREFORE CARRY
CHANCE POPS ON TUESDAY...WITH HIGHS DROPPING BACK INTO THE MIDDLE
80S.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z Wednesday NIGHT)
ISSUED AT 1145 PM CDT TUE SEP 1 2015

AN UPPER LEVEL HIGH PRESSURE RIDGE WILL MOVE IN FOR THE NIGHT
BRINGING CLEARING SKIES AFTER THE EVENING THUNDERSTORMS THAT
AFFECTED PORTIONS OF EAST CENTRAL AND SOUTHEAST ILLINOIS. THE MAIN
WEATHER FEATURE OVERNIGHT WILL BE THE POSSIBILITY OF INCREASING
FOG DEVELOPMENT...ESPECIALLY EAST CENTRAL IL WHERE THERE WILL BE A
COMBINATION OF LIGHTER WINDS AND LOW LEVEL MOISTURE FOLLOWING THE
EVENING RAINFALL. 06Z TAFS INCLUDE PERIODS OF IFR-MVFR VISIBILITY
AT KCMI-KDEC-KBMI. VFR CONDITIONS DEVELOPING BY 13Z. WINDS FOR
THE PERIOD GENERALLY S-SW UP TO 10 KTS.


&&

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

$$

SHORT TERM...Barnes
LONG TERM...Barnes
AVIATION...Onton


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