FXUS63 KLOT 271952
AFDLOT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
152 PM 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...
1800 UTC TAFS... A LARGE HIGH PRESSURE RIDGE WILL EXTEND FROM
LOUISIANA TO ONTARIO THIS AFTERNOON. THE WIND WILL BE AROUND 5 TO
8 KNOTS FROM THE NORTHWEST EARLY THIS AFTERNOON. AS THE HIGH
PRESSURE RIDGE MOVES EAST...THE WIND WILL TURN TO THE SOUTH THIS
EVENING. WE EXPECT THE SPEED TO BE 5 TO 10 KNOTS AT THE MOST THIS
EVENING AND TONIGHT. A WEAK SURFACE LOW WILL MOVE INTO SOUTHERN
WISCONSIN BY SATURDAY NIGHT. AS THE LOW APPROACHES SOME HIGH
CLOUDS AROUND 25000 FEET WILL MOVE INTO NORTHERN ILLINOIS. THE
WIND WILL BECOME SOUTHWEST AND INCREASE TO 10 TO 15 KNOTS.
&&
.MARINE...
127 PM CST
A LARGE HIGH EXTENDS FROM SOUTHERN MISSISSIPPI TO ONTARIO CANADA
THIS AFTERNOON. THE HIGH LIES OVER LAKE MICHIGAN. THIS RIDGE WILL
MOVE EAST TO THE EASTERN UNITED STATES BY SATURDAY NIGHT. A LOW
WILL MOVE INTO SOUTHERN WISCONSIN. THE WIND OVER LAKE MICHIGAN
WILL BE NORTHWEST THIS EVENING AND WILL SWITCH TO SOUTHWEST LATE
TONIGHT. DURING SATURDAY NIGHT THE WIND WILL BECOME WEST. DURING
THE DAY SUNDAY WE EXPECT A NORTHWEST WIND WITH SPEED OF 15 TO 25
KNOTS. WE EXPECT A CHANCE OF RAIN SHOWERS ON SUNDAY.
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...NONE.
IN...NONE.
LM...SMALL CRAFT ADVISORY...NEARSHORE GARY TO MICHIGAN CITY IN UNTIL 4 PM FRIDAY.
&&
$$
