Area Forecast Discussion
Issued by NWS Twin Cities, MN

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000
FXUS63 KMPX 232343
AFDMPX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
543 PM CST MON FEB 23 2015

.SHORT TERM...(THIS EVENING THROUGH TUESDAY)
ISSUED AT 230 PM CST MON FEB 23 2015

A STRONG PRESSURE GRADIENT TONIGHT WILL KEEP TEMPS FROM FALLING
MUCH...AND WILL LIKELY HOLD AND BEGIN TO RISE OVERNIGHT. TEMPERATURES
ACROSS SOUTHERN MANITOBA ARE IN THE MID/UPPER 20S AHEAD OF A
STRONG WARM FRONT MOVING INTO THE DAKOTAS THIS AFTN. THESE WARMER
TEMPS WILL LIKELY ADVECT SE AND SPREAD ACROSS WESTERN MN DURING
THE EVENING...AND ACROSS SOUTHERN MN AFT MIDNIGHT. IN
ADDITION...STRONG WAA AHEAD OF THIS FRONT WILL LEAD TO SOME -SN
DURING THE EVENING...ESPECIALLY ACROSS CENTRAL AND NORTHERN MN.
HOWEVER...THE INITIAL DRY AIR MASS IN SOUTHERN MN WILL LIKELY
DISSIPATE ANY PRECIPITATION THAT FALLS UNTIL WELL AFT MIDNIGHT AS
ANOTHER STRONGER SHRTWV ACROSS CENTRAL MANITOBA RACING SE OVER
MN/WI BY MORNING. LATEST WV IMAGERY SHOWS THIS SHRTWV FAIRLY
STRONG...SO I WOULD NOT BE SURPRISE TO SEE SOME ACCUMULATING
SNOWFALL IN OUR NE CWA BY LATE TUESDAY MORNING. HOW FAR SW THIS
AREA OF LIGHT SNOW OCCURS IS DEPENDENT ON THE DEPTH OF THE
MOISTURE AND LOCATION OF THE SHRTWV. BY LATE MORNING...A COLD
FRONT WOULD HAVE MOVED ACROSS MOST OF MN...CAUSING TEMPS DURING
THE AFTN TO SLOWLY FALL. GUSTY WINDS WILL ALSO CONTINUE THRU THE
AFTN AS STRONG CAA DEVELOPS.

.LONG TERM...(TUESDAY NIGHT THROUGH MONDAY)
ISSUED AT 230 PM CST MON FEB 23 2015

NO SIGNIFICANT CHANGES TO THE EXTENDED FORECAST. AS ALLUDED TO IN THE
PREVIOUS DISCUSSION...COLD WEATHER IS A CERTAINTY...WITH LINGERING
LIGHT SNOW REMAINING POSSIBLE...BUT NOT LIKELY ACROSS CENTRAL MN AND
WESTERN WI.

THERE ARE TWO MAIN CHANCES FOR PRECIPITATION. THE FIRST COMES
WEDNESDAY AS A POTENT PV ANOMALY DIVES ALONG THE MISSOURI RIVER
VALLEY AND WILL PRODUCE A QUICK BURST OF MODERATE TO HEAVY SNOWFALL.
THE BULLSEYE OF QPF MATCHES UP WILL WITH THE H850 THETA_E
ADVECTION...BUT THIS FORCING REMAINS SOUTHWEST OF THE CWA. SO...LIGHT
SNOW SHOULD REMAIN CONFINED SOUTH AND WEST OF THE UPPER MINNESOTA
RIVER VALLEY.

THIS SYSTEM WILL BE FOLLOWED BY ANOTHER ARCTIC HIGH WITH COLD
TEMPERATURES AND CLEAR SKIES. THIS HIGH WILL SHIFT EASTWARD AS AN
UPPER LEVEL TROUGH CARVES OUT ACROSS THE 4-CORNERS REGION...WITH
DOWNSTREAM SOUTHWEST FLOW DEVELOPING ACROSS THE CENTRAL CONUS. THE
NORTHERN EXTEND OF THIS SOUTHWEST FLOW WILL DETERMINE THE STORM
TRACK...AND POTENTIAL FOR SNOW OVER THE WEEKEND. AT THIS TIME...DID
NOT STRAY FROM A BLENDED GUIDANCE...WHICH HAS THE HEAVIEST SNOW
CLOSER TO THE I-80 CORRIDOR THAN THE I-90 CORRIDOR.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z TUESDAY EVENING)
ISSUED AT 543 PM CST MON FEB 23 2015

A TIGHT PRESSURE GRADIENT WILL BE MAINTAINED ACROSS THE TAF SITES
TONIGHT IN ADVANCE OF AN APPROACHING COLD FRONT DROPPING SOUTH
FROM CENTRAL CANADA. SOUTH TO SOUTHWEST WINDS THIS EVENING WILL BE
FROM 12-18 KNOTS SUSTAINED ALONG WITH GUSTS FROM 20 TO 25 KNOTS.
SOME LIGHT SNOW IS EXPECTED WITH THE FRONTAL PASSAGE LATE IN THE
NIGHT ACROSS CENTRAL MN THROUGH WEST CENTRAL WI. CONFIDENCE IS
HIGHEST FOR MVFR CEILINGS AND VISIBILITIES AT BOTH KRNH AND KEAU
FROM ABOUT 08Z THROUGH 15Z. NORTHWEST WINDS WILL INCREASE TO NEAR
20 KNOTS IN THE WAKE OF THE COLD FRONT ON TUESDAY AND PERSIST
THROUGH THE DAY. GUSTS WILL BE FROM 25 TO 30 KNOTS.

KMSP...WINDS THIS EVENING WILL BE FROM 200-210 DEGREES NEAR 15
KNOTS. WINDS WILL VEER TO THE WEST BEFORE DAYBREAK AND THEN
NORTHWEST IN THE MORNING AS A COLD FRONT MOVES THROUGH. SMALL
THREAT FOR MVFR CEILINGS/VISIBILITIES IN -SN WITH THE FRONTAL
PASSAGE. NORTHWEST WINDS IN THE WAKE FOR THE FRONT 15-20 KNOTS
GUSTING 25-30 KNOTS.

/OUTLOOK FOR KMSP/

WED...VFR. WINDS NNW 10 KTS.
THU...VFR. WINDS NW 5-10 KTS.
FRI...VFR. WINDS WSW 5 KTS.

&&

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

$$

SHORT TERM...JLT
LONG TERM...JRB
AVIATION...RAH



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