AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
345 AM CDT THU MAY 13 1999
UPPER LEVEL FEATURES
NEGATIVELY TILTED SHORT WAVE TROF FM THE DAKOTAS TO SRN IL FCST BY
MODELS TO BECOME A WEAK CLOSED LOW OVR IL AND DIG TO SE TODAY. THIS
LOOKS REASONABLE AS 06-08Z ACARS (ACWEB.FSL.NOAA.GOV) SHOWS 70-90KT
WINDS AROUND 300MB DIVING INTO TROF OVER NEBRASKA WITH ONLY 50 KNOT
WINDS ON EAST SIDE OF TROF. AS UPPER LOW DROPS SE RIDGE OVER CANADA
WILL BUILD IN AND HELP CLEAR SKIES FM NE TO SW.
LOW LEVELS
DRY...COLD AIR FLITERING INTO NRN MI AND FAR NRN WI COURTESY OF
SFC HI OVER CENTRAL CANADA. TEMPS ALREADY DOWN TO MID 30S IN FAR
NRN WISCONSIN. SFC DEWPOINTS IN TEENS AND 20S IN NRN MI AND SRN
CANADA WILL ADVECT INRO NERN WI TODAY WHILE CAA CONTINUES IN LOW LVLS
TODAY AND TONIGHT.
FORECAST DETAILS
LEFTOVER RW IN FAR SWRN PTN OF FCST AREA (WISCONSIN RAPIDS) SHOULD
END BY SUNRISE OR SHORTLY THEREAFTER AS UPPER SYSTEM MOVES S. SKIES
ARE ALREADY CLEAR NE OF A GRB TO EAGLE RIVER LINE...AND SKIES SHOULD
BECOME PARTLY SUNNY FM NE TO SW TODAY. FAR SW MIGHT STAY CLOUDY UNTIL
LATE IN THE DAY. WITH CAA AND NE FLOW OFF LK MI TEMPS SHOULD STAY IN 50S
JUST ABT EVERYWHERE. QUESTION FOR TONIGHT IS HOW MUCH FROST/FREEZING
TEMPS WILL OCCUR. THINK THAT AREA NORTH OF A GRB TO AUW LINE WILL SEE
WIDESPREAD FROST AS LONG AS WINDS DROP OFF TONIGHT. LOW DEWPOINTS AND
CLEAR SKIES MAY ALLOW TEMPS TO FALL TO UPPER 20S IN FAR NE. MKE WILL
ISSUE FROST OR FREEZE ADVISORY WITH ZONE FORECAST.
LEFTOVER RW SHOULD
END IN SWRN PTN OF THE FCST AREAS THIS MORNING AS UPPER SYSTEM MOVES
SOUTH
RDM
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