Expires:No;;291621
FXUS63 KLOT 271143
AFDLOT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
543 AM CST FRI NOV 27 2009
.DISCUSSION...
251 AM CST
WITH RIDGING WORKING EAST ACROSS ILLINOIS TODAY...SFC FLOW STARTS 
BACKING FROM NW TO WEST...BECOMING ANTICYCLONIC FOR THE REMAINDER OF 
THE DAY. THUS THE STRATO CU DECK THAT WILL GREET EARLY MORNING
SHOPPERS WILL PUSH EAST OUT OF ILLINOIS AND INDIANA WHILE ERODING
FROM INCREASING SUBSIDENCE BUILDING ACROSS THE AREA. A DIVING UPR
JET ACROSS THE AREA WILL BE HIGHLITED BY SOME SCT TO BKN CI WHICH
WILL DOMINATE SKIES ONCE THE STRATO CU MOVES OUT. MORNING LOWS
AROUND 30 SHUD ONLY CLIMB INTO THE LOWER 40S HOWEVER DESPITE THE
SUNSHINE LEECHING THRU THIS HIGH CLOUD COVER.
WITH UPR RIDGING WORKING ACROSS THE MS VLY TONIGHT INTO SATURDAY
...850 TEMPS WARM UP TO 10C FOR SATURDAY...IMPLYING MAX
TEMPERATURES IN THE 50S. SUNSHINE SHUD BE PLENTIFUL FOR SATURDAY
TO HELP KICK TEMPERATURES UPSTAIRS. BUT INCREASING CLOUDINESS WILL
WORK INTO THE MS VLY SAT NGT INTO SUNDAY AS ANOTHER SYSTEM DIVES
OUT OF THE NRN PLAINS INTO THE GREAT LAKES REGION. ITS ASSOCIATED
COLD FRONT WILL DROP THROUGH NRN IL EARLY SUNDAY MRNG. YET BEST
CHANCES OF RAIN WILL BE NORTH OF ILLINOIS SUNDAY WITH COLD AIR
ADVECTION SUNDAY NIGHT MIXING ANY CHC OF RAIN WITH SNOW. ANY PCPN
WILL BE SHORTLIVED AS HIGH PRESSURE ONCE AGAIN BUILDS INTO THE
MIDWEST AND OHIO VLY FROM THE PLAINS LATE SUN NGT AND MONDAY.
INCONSISTENCIES IN THE EXTENDED FORECAST LEND ITSELF TO WAFFLING. AM 
THUS NOT MAKING ANY CHANGES TO THE EXTENDED AT THIS ISSUANCE.
RLB
&&
.AVIATION...
545 AM CST
1200 UTC TAFS...A QUIET DAY ON TAP FOR AVIATION WEATHER CONCERNS.
LATEST SATELLITE IMAGERY INDICATES THE MVFR STRATOCU DECK IS
BREAKING UP OVER NRN IL/SRN WI. ONLY PATCHES OF MVFR REMAIN AT
ISSUANCE TIME AND BASED ON THE RAPID ERROSION OF THE CLOUD
DECK...EXPECT ALL SITES TO GO VFR BY 14Z. CLOUD COVER WILL
CONTINUE TO DECREASE THROUGH THE DAY AS A SFC RIDGE BEGINS TO
SPREAD EAST ACROSS THE MISSISSIPPI RIVER AND INTO THE UPPER
MIDWEST. 
ALSO...AS THE RIDGE SPREAD EWD...WINDS WILL QUICKLY BACK FROM NWLY
TO SWLY BY EARLY THIS AFTERNOON. THE RIDGE AXIS WILL CROSS IL/IN
LATE AFTERNOON AND EARLY EVENING AND WINDS AT ALL SITES WILL
SETTLE INTO A LIGHT SELY BY LATE EVENING AND REMAIN SO OVERNIGHT.
KREIN 
&&
.MARINE...
345 AM CST
LOW PRESSURE OVER LAKE HURON WILL GRADUALLY FILL OVERNIGHT AS
STRONGER LOW PRESSURE APPROACHING CAPE COD DEEPENS AS IT MOVES
TO NOVA SCOTIA BY SATURDAY MORNING. A RIDGE OF HIGH PRESSURE
EXTENDING ALONG THE MISSISSIPPI RIVER WILL SLOWLY MOVE EAST OVER
THE UPPER GREAT LAKES REGION FRIDAY AND FRIDAY NIGHT. A BROAD AREA
OF LOW PRESSURE OVER FAR SOUTH CENTRAL CANADA AND THE NORTHERN AND
CENTRAL PLAINS ON FRIDAY WILL CONSOLIDATE INTO A SINGLE LOW NEAR
THE UPPER PENINSULA OF MICHIGAN BY SATURDAY AFTERNOON. A COLD
FRONT ASSOCIATED WITH THIS LOW WILL MOVE THROUGH THE WESTERN GREAT
LAKES SATURDAY NIGHT AND SUNDAY MORNING. HIGH PRESSURE WILL
GRADUALLY SPREAD FROM THE PLAINS ACROSS THE GREAT LAKES...MIDWEST
AND MID MISSISSIPPI VALLEY SUNDAY NIGHT AND MONDAY.
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...SMALL CRAFT ADVISORY...NEARSHORE WINTHROP HARBOR TO GARY IN UNTIL 11 AM 
     FRIDAY.
     SMALL CRAFT ADVISORY...NEARSHORE GARY TO MICHIGAN CITY IN UNTIL 4 PM FRIDAY.
&&
$$