NZUS99 KLOT 271818
WRKAVA
AVIATION FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO IL
118 PM CDT TUE MAR 27 2012
//ORD AND MDW CONCERNS...UPDATED 18Z...
* SOUTH WINDS GUSTING TO ARND 30KT THIS AFTERNOON.
* FRONTAL PASSAGE LATE THIS EVENING...ASSOCIATED PRECIP/TS
  COVERAGE/INTENSITY A CONCERN.
* WINDS VEERING SWLY TO WLY FOLLOWING FRONTAL PASSAGE.
KREIN/PAW
//DISCUSSION...UPDATED 18Z...
COLD FRONT WILL BE MOVING INTO NORTHERN ILLINOIS THIS EVENING.
ISOLATED TO SCATTERED SHRA/TSRA DEVELOPING AHEAD OF THE FRONT IN
THE 00Z-04Z TIME FRAME. THE EARLY PART OF THAT PERIOD AT RFD AND A
LITTLE LATER IN THE PERIOD AT THE EASTERN TERMINALS. COVERAGE IS
STILL UNCERTAIN...WITH NORTHERN ILLINOIS BEING NEAR THE NORTH EDGE
OF A LARGE AREA FAVORABLE FOR DEVELOPMENT. THE FRONT WILL PUSH
THROUGH QUICKLY OVERNIGHT ENDING THE THREAT OF SHRA/TSRA AND
SHIFTING WINDS TO THE WEST.
KREIN/PAW
//ORD AND MDW CONFIDENCE...UPDATED 18Z...
* HIGH CONFIDENCE IN WIND FORECAST.
* MODERATE CONFIDENCE ON FRONTAL PASSAGE TIMING
* LOW TO MODERATE CONFIDENCE ON TSRA COVERAGE/INTENSITY
KREIN/PAW
//OUTLOOK FOR ORD/MDW FOR 00Z THURSDAY-12Z TUESDAY...UPDATED 12Z...
 * WEDNESDAY...VFR. GUSTY WESTERLY WINDS.
 * THURSDAY...VFR. 
 * FRIDAY...CHC OF -SHRA AND SLIGHT CHC OF -TSRA. 
 * SATURDAY...CHC OF -SHRA AND SLIGHT CHC OF -TSRA. 
 * SUNDAY...VFR.
SHEA