Area Forecast Discussion
Issued by NWS Twin Cities, MN

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FXUS63 KMPX 251759
AFDMPX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1159 AM CST TUE NOV 25 2014

.SHORT TERM...(TODAY THROUGH WEDNESDAY)
ISSUED AT 309 AM CST TUE NOV 25 2014
ISSUED BY NATIONAL WEATHER SERVICE LA CROSSE WI

ATTENTION FOCUSED ON NEXT FAST-MOVING SYSTEM APPROACHING IN THE
NORTHWEST FLOW PATTERN WITH ACCUMULATING SNOW AND BLUSTERY
CONDITIONS ANTICIPATED FOR PARTS OF THE AREA.

BRIEF PERIOD OF TRANQUIL WEATHER TODAY AS HIGH PRESSURE MOVES
THROUGH THE REGION. SATELLITE IMAGERY SHOWS A WEDGE OF CLEAR SKIES
THROUGH THE HEART OF MN...BUT THAT IS QUICKLY REPLACED BY AN
ADVANCING SHIELD OF LOW CLOUD ACROSS THE EASTERN DAKOTAS AND FAR
WESTERN MN. THIS LOOKS TO ADVANCE EAST ACROSS THE FORECAST AREA
TODAY.

ATTENTION THEN QUICKLY TURNS TO THE APPROACHING SYSTEM FOR TONIGHT
INTO WEDNESDAY. MODELS IN REASONABLE AGREEMENT IN TRACKING THE
SURFACE LOW FROM WESTERN ND LATE TODAY...TO NEAR ABERDEEN DURING
THE EVENING...AND INTO NORTHWEST IA OVERNIGHT. WITH THIS TRACK...
ANTICIPATE THE BAND OF HEAVIEST SNOW TO FALL ACROSS EASTERN SD AND
SOUTHWEST MN FROM THE SISSETON HILLS TO THE BUFFALO RIDGE.
SOMEWHAT LIMITED MOISTURE AND SPEED OF SYSTEM SHOULD LIMIT AMOUNTS
FOR THE MOST PART...BUT 2-4 INCHES DOES APPEAR VERY POSSIBLE.
BEHIND THE SYSTEM ON WEDNESDAY...GUSTY NORTHWEST WINDS LOOK TO
RAMP UP AND COULD CAUSE A FEW ISSUES WITH BLOWING AND DRIFTING.
COORDINATED WITH FGF/ABR/FSD REGARDING THE POSSIBLE NEED FOR AN
WINTER WEATHER ADVISORY TO ADDRESS THESE CONCERNS. BUT THERE
REMAINS JUST A BIT OF UNCERTAINTY ON THE EXACT TRACK AND EVENTUAL
SNOW AMOUNTS. DECISION WAS MADE TO HOLD OFF AT THIS POINT...BUT
DAY SHIFT WILL MONITOR CLOSELY.

AS MAIN SHORT WAVE TROUGH DROPS SOUTH THROUGH MO/IL ON WED...
SECONDARY TROUGH DROPS IN FROM MANITOBA AND INTO THE ARROWHEAD AND
LAKE SUPERIOR AREA. THIS...IN CONCERT WITH AMPLE COLD ADVECTION
SHOULD HELP TO SQUEEZE OUT ANY REMAINING MOISTURE IN THE FORM OF
LIGHT SNOW. SREF SHOWING HIGHER PROBABILITY OF SNOW BUT MOST
OTHER MODEL SOLUTIONS HAVE LOWER CHANCES. THIS LOOKS TO ME LIKE A
HIGH CHANCE FOR SNOW...BUT A LOWER CHANCE FOR ACCUMULATION. WITH
THAT IN MIND BOOSTED THE CHANCES UP INTO THE LIKELY CATEGORY BUT
KEPT ACCUMULATIONS TO A MINIMUM.

.LONG TERM...(WEDNESDAY NIGHT THROUGH NEXT MONDAY)
ISSUED AT 309 AM CST TUE NOV 25 2014
ISSUED BY NATIONAL WEATHER SERVICE LA CROSSE WI

HIGH PRESSURE AGAIN BUILDS IN WEDNESDAY NIGHT WITH ANY RESIDUAL
SNOW TAPERING OFF AND ENDING. THE COLD SURGE IS IMPRESSIVE WITH
925 MB TEMPS DROPPING TO -16 TO -19 DEG C AND 850 MB BY 12Z THU.
WITH FRESH SNOW ON THE GROUND AGAIN...MOST MODELS DO NOT APPEAR
TO BE COLD ENOUGH. WENT NEAR OR BELOW THE COOLEST OF THE GUIDANCE
FOR THIS PERIOD.

NORTHWEST FLOW CONTINUES THROUGH THE END OF THE WEEK...WITH THE
NEXT FAST-MOVING SYSTEM DUE IN ALREADY THURSDAY NIGHT/FRIDAY.
UPPER FLOW IS STARTING TO BECOME LESS AMPLIFIED BY THIS TIME SO
SOME MODERATION IN TEMPERATURES WILL BEGIN. DESPITE THIS SHORT
WAVE BEING A BIT WEAKER...THE ISENTROPIC UPGLIDE LOOKS SUFFICIENT
TO GENERATE A GOOD CHANCE FOR ACCUMULATING SNOWS ACROSS THE
NORTHERN 2/3 OF MN.

DEEPER TROUGH BEGINS DIGGING INTO SOUTHWEST CANADA AND THE PACIFIC
NORTHWEST COAST BY THE WEEKEND. WEAK WAVES MOVING EAST AHEAD OF
THIS COULD BRING CHANCES FOR SNOW TO NORTHERN MN...BUT KEPT THE
FORECAST AREA OUT OF THIS FOR THE MOST PART. THIS PATTERN WILL
ALSO LEAD TO SOME MODERATION OF TEMPERATURES BACK UP TO NEAR THE
FREEZING MARK AGAIN.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z WEDNESDAY AFTERNOON)
ISSUED AT 1159 AM CST TUE NOV 25 2014

MVFR CEILINGS AT KEAU EXPECTED TO DISSIPATE BY 19Z AS SHORT WAVE
RIDGE MOVES IN WITH THE LOW LEVEL FLOW BECOMING WESTERLY. TO THE
WEST...A PATCH OF VFR CLOUDS FROM 035-050 WILL COVER THE TAF SITES
FOR MUCH OF THE AFTERNOON AS WELL AS MOVE INTO KEAU BY 20Z. THIS
DECK MAY SCATTER OUT THIS EVENING BUT MID LEVEL CLOUDS BKN-
OVC080-100 WILL BE SPREADING IN AHEAD OF CLIPPER. THE HEAVIEST SNOW
BAND WITH THIS SYSTEM IS DOWN THE MN RIVER FROM APPLETON TO
MANKATO. THIS WILL IMPACT KRWF WEDNESDAY MORNING WITH MODERATE
SNOW POSSIBLE IN THE MORNING. VSBY FORECAST OF 3/4SM ATTM. SOME OF
THIS SNOW WILL GET PULLED EASTWARD ACROSS THE TWIN CITIES AND WEST
CENTRAL WI FROM MID MORNING ONWARD AS A SHORT WAVE PASSES BY TO
THE NORTH. OVERALL...MVFR CEILINGS WILL FOLLOW CLOSELY WITH THE
ONSET OF SNOW LATER TONIGHT AND WEDNESDAY. WINDS WILL BACK FROM
SOUTHERLY TO NW DURING THE TAF PERIOD.

KMSP...VFR THIS AFTERNOON AND MUCH OF TONIGHT. CEILINGS AND
VISIBILITIES DETERIORATING BETWEEN 12Z AND 15Z ON WEDNESDAY TO
MVFR/IFR RESPECTIVELY AS SNOW MOVES IN. SNOW DIMINISHING IN THE
LATE AFTERNOON WITH WINDS BECOMING NORTHWEST THROUGH THE EVENING.
SNOW ACCUMULATION ON WEDNESDAY FROM 2-3 INCHES.

/OUTLOOK FOR KMSP/
THU...VFR. NW 4-8 KTS.
FRI...CHC MVFR AND -SN. WINDS SE 5 KTS.
SAT...CHC MVFR. WINDS NORTH 10 KTS.

&&

.MPX WATCHES/WARNINGS/ADVISORIES...
MN...NONE.
WI...NONE.
&&

$$

SHORT TERM...MW
LONG TERM...MW
AVIATION...RAH






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