Area Forecast Discussion
Issued by NWS Green Bay, WI

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000
FXUS63 KGRB 312332
AFDGRB

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
632 PM CDT TUE MAR 31 2015

UPDATED AVIATION PORTION FOR 00Z TAF ISSUANCE

.SYNOPSIS...
ISSUED AT 247 PM CDT TUE MAR 31 2015

MILD THE NEXT FEW DAYS WITH SHOWERS AND POSSIBLY SOME
THUNDERSTORMS WEDNESDAY NIGHT INTO THURSDAY. COOLER FOR LATE IN
THE WEEK AND THE WEEKEND.

PROGRESSIVE AND ENERGETIC BAND OF WESTERLIES WILL CONTINUE ACRS
MUCH OF THE CONUS AND SRN CANADA FOR THE REST OF THE WEEK AND THE
START OF THE WEEKEND. A TRANSITION TO A MORE SOUTHWEST FLOW
REGIME...THOUGH STILL WITH ONLY MODEST AMPLITUDE...INCREASINGLY
LIKELY FOR EARLY NEXT WEEK.

THE MAIN WEATHER PRODUCER THE NEXT FEW DAYS WILL BE CYCLONE
MIGRATING THROUGH SRN CANADA. WARMER AIR RETURNING NWD AHEAD OF
THE CYCLONE WL RESULT IN A FEW MILD DAYS ACRS THE AREA. COOLER
AIR WL SHIFT SWD IN IT/S WAKE...AND LIKELY LINGER INTO NEXT WEEK.
EXPECT MODEST PCPN TO OCCUR WITH THE PASSAGE OF THE COLD FRONT
TRAILING SWD FM THE CYCLONE. AN EVEN MORE FAVORABLE PATTERN FOR
PCPN COULD EVOLVE NEXT WEEK AS FRONTAL BOUNDARY SETS UP NR THE
REGION. BEST ESTIMATE IS THAT AMNTS WL END UP AOA NORMAL FOR THE
PERIOD.
&&

.SHORT TERM...TONIGHT AND WEDNESDAY
ISSUED AT 247 PM CDT TUE MAR 31 2015

QUIET WEATHER IS EXPECTED IN THE SHORT TERM FOR THE MOST PART.
NORTHEAST WISCONSIN IN A TRANSITION ZONE BETWEEN A SPRAWLING HIGH
TO THE EAST...AND AN APPROACHING LOW PRESSURE SYSTEM OUT OF THE
NORTHERN PLAINS. PRECIPITATION CHANCES RETURN WEDNESDAY AFTERNOON
AHEAD OF A COLD FRONT WITH SHOWERS AND ISOLATED THUNDER IN THE
FCST.

RIDGING ALOFT WILL KEEP THE AREA DRY TONIGHT. LOOKED AT FOG
POTENTIAL FOR TONIGHT...BUT WAST VERY OVERWHELMING. WHILE
SURFACE WINDS WILL BE LIGHT AGAIN...WINDS JUST ABOVE THE SFC
SHOULD KEEP THINGS MIXED AND HINDER ANY FOG DEVELOPMENT.
FURTHERMORE...LOOKING AT UPSTREAM OBS FROM LAST NIGHT IN THE
DAKOTAS AND MONTANA WHERE OUR WEATHER FOR TONIGHT WILL BE
ORIGINATING FROM...NO FOG WAS NOTED. IF FOG WERE TO DEVELOP...THE
BEST CHANCES WOULD IN THE NORTH AND EAST...WHICH WILL BE FURTHEST
AWAY FROM THE TIGHTENING PRESSURE GRADIENT AS OUR NEXT SYSTEM
APPROACHES OUT OF THE NORTHERN PLAINS.

MODELS STILL HAVE THE LOW PRESSURE SYSTEM AND ASSOCIATED COLD
FRONT MOVING INTO MINNESOTA AND NW MN WEDNESDAY AFTERNOON. A LOW
LEVEL JET STARTS RAMPING UP IN THE EARLY MORNING HOURS OF
WEDNESDAY...BRINGING MUCH WARMER TEMPERATURES INTO THE AREA AND
CLOUDS TO THE NORTH. IN FACT...WEDNESDAY SHOULD BE THE WARMEST DAY
OF THE YEAR SO FAR. SOME BETTER UPPER LEVEL DYNAMICS WILL SLIDE
OVER THE STATE AROUND 18Z WEDNESDAY AHEAD OF THE MAIN SYSTEM.
THIS COMBINED WITH THE LOW LEVEL JET COULD POP UP A FEW RAIN
SHOWERS IN NORTHERN WISCONSIN IN THE AFTERNOON...HOWEVER LOOKING
TO OUR WEST THERE ARE NO SHOWERS AND VERY LIMITED CLOUD COVER.
BUFKIT SOUNDINGS SHOW LITTLE MOISTURE FOR SHOWER ACTIVITY TO
DEVELOP...SO TOOK SLIGHT CHANCES OUT FOR THE NORTH IN THE EARLY
AFTERNOON AND FOCUSED POPS ON THE APPROACHING DISTURBANCE. WITH
THIS IN MIND...SLOWED PROGRESSION OF POPS EAST IN THE AFTERNOON AS
BEST CHANCES WONT BE UNTIL THE FRONT ARRIVE WEDNESDAY NIGHT.

.LONG TERM...WEDNESDAY NIGHT THROUGH TUESDAY
ISSUED AT 247 PM CDT TUE MAR 31 2015

THE MAIN WEATHER MAKER THE NEXT FEW DAYS WILL BE CYCLONE CROSSING
SRN CANADA. THE GUIDANCE HAS NOT CHANGED MUCH IN THE HANDLING OF
THE SYSTEM SINCE YDA. EDGED POPS UPWARD AS WE ARE GETTING CLOSER
TO THE EVENT...WITH CATEGORICALS NOW MOST LCNS AT SOME POINT.
CONTD MENTION OF THUNDER DESPITE LATE NGT/EARLY MORNING FROPA AS
MID-LVL LAPSE RATES ARE QUITE STEEP AND FAIRLY STG LLJ WL BE
TRANSPORTING MOISTURE INTO THE RGN.

SEVERAL OF THE MODELS HAVE WAFFLED BACK ARND TO THE IDEA OF
SECONDARY WV ALONG THE TRAILING COLD FRONT RIDING FAR ENOUGH N TO
CLIP THE SE CORNER OF THE FCST AREA WITH PCPN FRI. JUST WANT TO
GIVE THIS ONE MORE RUN TO GET SORTED OUT BEFORE PUTTING PCPN BACK
IN THAT PERIOD...SO WENT WITH SILENT 14/S ACRS E-C WI FOR NOW.

LITTLE CONFIDENCE IN THE EXACT DETAILS OF THE PATTERN IN TERMS OF
PCPN LCN/TIMING IN THE LATTER PART OF THE FCST. BUT IT SEEMS
LIKELY THAT A STG FRONTAL BOUNDARY WL SET-UP NR THE RGN AND
PROVIDE THE FOCUS FOR PCPN. AT THIS TIME OF YEAR...IT/S MUCH MORE
LIKELY THAT THE FCST AREA WL END UP SITTING N OF THE FRONT...WITH
CHILLY ELY FLOW AND PERIODS OF PCPN. SOME OF THAT COULD EVEN BE
SNOW.
&&

.AVIATION...FOR 00Z TAF ISSUANCE
ISSUED AT 632 PM CDT TUE MAR 31 2015

VFR CONDITIONS ARE EXPECTED TO BE PRESENT THROUGH THE
TAF PERIOD.  WEAK LOW PRESSURE WILL EXIT FAR NORTHEAST WISCONSIN
THIS EVENING...ENDING LIGHT SHOWERS OVER THE DOOR PENINSULA.
THEREAFTER...WILL SEE PERIODS OF SCATTERED TO BROKEN MID-CLOUDS.
WINDS ON WEDNESDAY...HOWEVER...WILL TURN TO THE SOUTHEAST AND BECOME
STRONG AND GUSTY DURING THE AFTERNOON.  SHOWERS AND THUNDERSTORMS
WILL BE POSSIBLE WEDNESDAY NIGHT.



MPC.
&&

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

$$

SYNOPSIS.......SKOWRONSKI
SHORT TERM.....ALLEN
LONG TERM......SKOWRONSKI
AVIATION.......MPC





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