000
FXUS63 KGRB 272058
AFDGRB

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
258 PM CST TUE JAN 27 2015

FORECAST DISCUSSION FOR ROUTINE AFTERNOON FORECAST ISSUANCE

.SHORT TERM...TONIGHT AND WEDNESDAY
ISSUED AT 258 PM CST TUE JAN 27 2015

THE LATEST RAP ANALYSIS AND SATELLITE/RADAR IMAGERY SHOW ARCTIC HIGH
PRESSURE NOSING SOUTHWEST ACROSS THE UPPER PENINSULA AND THE STATE
OF WISCONSIN.  BUT DESPITE THE RIDGE AXIS SHARPENING OVER NE
WISCONSIN...LOW STRATUS HAS BEEN AWFULLY DIFFICULT TO ERODE THIS
AFTERNOON.  CLOUDS OVER NORTHERN LAKE MICHIGAN ARE VERY SLOWLY
ERODING FROM EAST TO WEST...AND AS BOUNDARY LAYER FLOW LIGHTENS AND
BACKS TO THE NORTH LATER THIS AFTERNOON...THINK THIS WILL ACCELERATE
CLEARING OVER THE FOX VALLEY AND LAKESHORE.  OTHERWISE...OVERCAST
CONDITIONS TO REMAIN OVER CENTRAL AND NORTH-CENTRAL WISCONSIN.
LOOKING UPSTREAM...CLOUDS ARE INCREASING AGAIN OVER THE NORTHERN
PLAINS AND NORTHWEST LAKE SUPERIOR AHEAD OF THE NEXT CLIPPER SYSTEM
WHICH WILL ARRIVE WEDNESDAY NIGHT.  IN THE MEANTIME...CLOUD AND TEMP
TRENDS ARE THE MAIN FORECAST CONCERNS.

TONIGHT...ARCTIC HIGH PRESSURE WILL TEMPORARILY BUILD ACROSS EASTERN
WISCONSIN THIS EVENING THEN RETREAT BACK EAST OVERNIGHT.  STILL
ANTICIPATING AT LEAST PARTIAL CLEARING TAKING PLACE OVER THE FOX
VALLEY AND LAKE SHORE AS THE RIDGE AXIS MOVES INTO THAT AREA. FARTHER
WEST...WINDS WILL TURN TO THE SOUTH OR SOUTHWEST...AND TRENDS OVER
THE U.P. SUPPORT THAT CLOUDS WILL JUST ROTATE NORTHWARD...LEAVING A
LOW OVERCAST DECK IN PLACE.  AS A RESULT...INCREASED SKY COVER.
THEN OVERNIGHT...MID AND HIGH CLOUDS WILL BE RETURNING FROM THE
NORTHWEST...AND ANY CLEARING OVER EASTERN WISCONSIN SHOULD GO BACK
TO BROKEN OR OVERCAST.  TRENDED WARMER WITH LOW TEMPS DUE TO THE
PERSISTENT CLOUD COVER.

WEDNESDAY...LOW PRESSURE WILL BE MOVING INTO THE NORTHERN
MISSISSIPPI VALLEY DURING THE AFTERNOON.  AS WINDS BACK TO THE
SOUTHEAST...WARMER LOW LEVEL AIR WILL FINALLY SURGE INTO CENTRAL AND
NORTHEAST WISCONSIN...WHICH SHOULD ERODE ANY REMAINING LOW OVERCAST.
HOWEVER...WILL STILL HAVE AMPLE MID AND UPPER CLOUDS
OVERHEAD...MAKING FOR A MOSTLY CLOUDY DAY.  AN 850MB WARM FRONT WILL
BE MAKING INTO NORTH-CENTRAL AND CENTRAL WISCONSIN BY LATE IN THE
AFTERNOON...BUT PROGGED SOUNDINGS CONTINUE TO SHOW A WEDGE OF DRY
AIR AROUND 10KFT THAT SHOULD BE ENOUGH TO KEEP THE AREA DRY.  HIGHS
WARMING INTO THE LOW TO MID 30S.

.LONG TERM...WEDNESDAY NIGHT THROUGH TUESDAY
ISSUED AT 258 PM CST TUE JAN 27 2015

NORTHWEST UPPER FLOW WILL CONTINUE THROUGH THE PERIOD...SO IT WILL
BE GENERALLY COLD AND DRY. THERE ARE AT LEAST TWO OPPORTUNITIES FOR
SOME SNOW. THE FIRST IS TOMORROW NIGHT AND EARLY THURSDAY AS JET
ENERGY APPROACHES FROM THE WEST. THERE ISN/T MUCH MOISTURE
AVAILABLE UNTIL THE SYSTEM GETS EAST OF WISCONSIN. THEREFORE SNOW
SHOULD BE LIGHT AND MIGHT BEGIN AS SLEET ACROSS THE CENTRAL AND
EAST CENTRAL AREAS. THERE IS ANOTHER CHANCE OF SNOW SATURDAY NIGHT
AND SUNDAY AHEAD OF ARCTIC AIR. THE GFS AND ECMWF HAVE A FEW WAVES
OF LOW PRESSURE THAT MOVE NORTHEAST ALONG THE FRONT...RESULTING IN
LOTS OF DIFFERENCES IN TIMING AND SNOW AMOUNTS. MILD PACIFIC AIR
WILL BRING US WARMER THAN NORMAL TEMPERATURES THURSDAY THEN BELOW
NORMAL TEMPERATURES ARE EXPECTED THROUGH THE MIDDLE OF NEXT WEEK.
THERE. WIND CHILL ADVISORIES MAY BE NEEDED MONDAY.
&&

.AVIATION...FOR 18Z TAF ISSUANCE
ISSUED AT 1121 AM CST TUE JAN 27 2015

WIDESPREAD MVFR AND IFR CIGS CONTINUE TO IMPACT THE REGION LATE THIS
MORNING.  HAVE TRENDED MORE PESSIMISTICALLY WITH THIS FORECAST
DESPITE ARCTIC HIGH PRESSURE BUILDING SOUTHWEST INTO THE STATE.
THOUGH CLEARING IS TRYING TO PUSH IN FROM THE EAST...PROGRESS HAS
BEEN SLOWER THAN ORIGINALLY THOUGHT AND NOW THINK THAT THE CENTRAL
AND NORTH-CENTRAL TAFS SITES WILL REMAIN MVFR OVERCAST DURING THE
AFTERNOON AND PART OF THE EVENING.  ANTICIPATED CIGS LOWERING AGAIN
OVERNIGHT IN THIS AREA AS THE INVERSION LOWERS.  ACROSS EASTERN
WISCONSIN...POTENTIAL REMAINS FOR CLEARING TO TAKE PLACE LATER THIS
AFTERNOON WHEN WINDS OFF THE LAKE SUBSIDE.  NO MATTER WHAT THE LOW
CLOUDS DO...MID AND HIGH CLOUDS WILL BE INCREASING TONIGHT THOUGH
EXPECT PRECIP TO HOLD OFF UNTIL LATER PERIODS.
&&

.GRB WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

SHORT TERM.....MPC
LONG TERM......RDM
AVIATION.......MPC