Area Forecast Discussion
Issued by NWS Twin Cities, MN

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000
FXUS63 KMPX 282105
AFDMPX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
405 PM CDT SUN SEP 28 2014

.SHORT TERM...(THIS EVENING THROUGH MONDAY)
ISSUED AT 405 PM CDT SUN SEP 28 2014

SHORT TERM CONCERNS ARE THE EXTENT OF LIGHT RAIN SHOWERS/ISOLATED
THUNDER THIS EVENING AND THEN TIMING OF COLD FRONT AND FORCING
ACROSS THE CWA INTO MONDAY.

THE COLD FRONT IS MOVING INTO THE NORTHWEST CORNER OF THE CWA THIS
AFTERNOON.  SOME MODERATE CUMULUS NOTED OVER WESTERN CENTRAL MN.
LITTLE IN THE WAY OF SIGNIFICANT INSTABILITY...BUT APPEARS TO BE
ENOUGH TO GENERATE A FEW ISOLATED SHRA/TSRA INTO THE LATE
AFTERNOON/EVENING. WILL CONTINUE THAT THREAT OVER THE WEST CENTRAL IN
THE EVENING.

THEN WILL FOLLOW A GENERAL SREF/NAM COMPROMISE...WHICH MOVES THE
FRONT THROUGH KMSP THROUGH 09Z-10Z.  THIS IS A BIT FASTER THAN
PREVIOUS RUNS. THE SHORT WAVE TROUGH ASSOCIATED WITH THE FRONT IS
BEEN PROGGED TO BE STRONGER THEREBY OVERCOMING THE RIDGE ALOFT AND
FORCING THE FRONT SOUTH THROUGH 12Z MONDAY.  LAYERED FRONTOGENESIS
AND ATTENDANT UPPER JET MOVING THROUGH NORTHERN MN AND NORTHWEST WI
THROUGH MONDAY MORNING.  THIS SHOULD BE STRONG ENOUGH TO GENERATE
THE LIGHT RAIN SHOWERS OVER THE NORTHEAST PORTION OF THE CWA LATER
TONIGHT THROUGH ABOUT 15Z MONDAY. COLDER AIR DROPS OVER THE AREA
THEN THROUGH THE DAY WITH THE SHOWER THREAT ENDING THROUGH 00Z TUE.

.LONG TERM...(MONDAY NIGHT THROUGH SUNDAY)
ISSUED AT 405 PM CDT SUN SEP 28 2014

THE LONG TERM PORTION OF THE FORECAST STILL LOOKS TO BE
ACTIVE...WITH SEVERAL OPPORTUNTIES FOR PRECIPITATION AS BROAD
TROUGHING DOMINATES THE CENTRAL CONUS.

MONDAY NIGHT INTO TUESDAY SHOULD BE A BRIEF RESPITE BETWEEN
PRECIPITATION-MAKERS...AS THE AREA REMAINS BETWEEN THE DEPARTING
TROUGH TO THE EAST AND THE ADVANCING WESTERN CONUS SYSTEM. MODEL
AGREEMENT HAS IMPROVED WITH RESPECT TO TEMPORAL FACTORS WITH THIS
FEATURE...WHICH STILL LOOKS ON TRACK TO BRING SHOWERS AND
THUNDERSTORMS TO WEST CENTRAL MN TUESDAY AFTERNOON...WHICH
SPREAD EAST TOWARD WESTERN WI DURING TUESDAY EVENING.

WEDNESDAY AND THURSDAY BRING CONTINUED PRECIPITATION CHANCES TO
THE EASTERN PART OF THE AREA...PARTICULARLY ALONG/EAST OF
INTERSTATE 35 AS THE NEGATIVELY TILTED TROUGH LIFTS NORTH ACROSS
MANITOBA AND THE FRONT GETS HUNG UP NEAR THE EASTERN FORECAST AREA.

FRIDAY LOOKS TO BE A FAIRLY CHILLY DAY...AS BRISK NORTHWEST WINDS
COMBINE WITH TEMPERATURES MAXING OUT IN THE 50S...LIKELY UNDER STRATOCU
CLOUDS FOSTERED BY A CYCLONIC FLOW REGIME.

FOR NEXT WEEKEND...THE 28.12Z GFS AND ECMWF SOLUTIONS DEPICT FAST
WEST/NORTHWEST MID LEVEL FLOW TO BE IN PLACE ACROSS THE REGION.
THIS COULD BE CONDUCIVE TO A FEW SHOWERS...BUT CONFIDENCE IS TOO
LOW AT THIS POINT TO INCLUDE A MENTION IN THE FORECAST.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z MONDAY AFTERNOON)
ISSUED AT 1233 PM CDT SUN SEP 28 2014

VFR CONDITIONS WILL THEN PREVAIL AT THE TAF SITES INTO THIS
EVENING. THEN AS COLD FRONT DROPS SOUTH...EXPECT MVFR CIGS TO
SPREAD SOUTH AND EAST THROUGH THE KRNH-KMSP-KRWF 10Z-13Z PERIOD
AND TO KEAU SHORTLY THEREAFTER. MVFR CIGS WILL ENVELOP THE
NORTHERN SITES BEFORE THEN WITH IFR CIGS EXPECTED TO DEVELOP FROM
07Z-12Z. WILL LIKELY CONTINUE THROUGH MID MORNING BEFORE BECOMING
LOW END MVFR AGAIN. BEST SHOT OF THE LIGHT RAIN WILL BE FOUND TO
THE NORTHEAST INTO MONDAY MORNING. WILL SEE WINDS S-SW AHEAD OF
THE FRONT AND THEN BECOMING N-NE WITH FROPA INTO MONDAY. SHOULD BE
10KTS OR LESS TODAY AND COULD BECOME GUSTY INTO MONDAY AFTERNOON
WITH FROPA.

KMSP...MAIN CONCERN DURING THE TAF PERIOD IS MVFR CIGS SPREADING
IN LATE TONIGHT WITH THE COLD FROPA. LATEST MODEL GUIDANCE
SUGGESTS THE FRONT MAY BE COMING IN A BIT FASTER.  THERE IS
POTENTIAL FOR A PERIOD OF IFR CIGS BUT HIGHER CONFIDENCE WAS
HIGHEST ON THE MVFR CIGS 10Z-12Z WITH FROPA.

/OUTLOOK FOR KMSP/

TUE...VFR. MVFR/SHRA LIKELY OVERNIGHT. WINDS SE 10 KTS.
WED...MAINLY VFR. CHANCE MVFR IN SHRA/TSRA. WINDS S 10 KTS.
THU...MAINLY VFR. CHANCE MVFR IN SHRA. W WINDS 5-10 KTS BECOMING
NW.


&&

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

$$

SHORT TERM...DWE
LONG TERM...LS
AVIATION...DWE





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