Area Forecast Discussion
Issued by NWS Twin Cities, MN

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000
FXUS63 KMPX 151224
AFDMPX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
724 AM CDT MON SEP 15 2014

.UPDATE...FOR 12Z AVIATION DISCUSSION BELOW

&&

.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 330 AM CDT MON SEP 15 2014

WATER VAPOR IMAGERY SHOWS A DECENT SHORTWAVE TROUGH POKING INTO
MINNESOTA EARLY THIS MORNING...WHILE RADAR IMAGERY SHOWS RAIN
BLOSSOMING OVER SOUTHERN MINNESOTA. MODELS HAVE BEEN A BIT TOO
FAR SOUTH WITH THEIR DEPICTION OF PRECIPITATION...PER RADAR
TRENDS. A COUPLE OF THE HI-RES MODELS...NAMELY THE HOPWRF AND
HRRR...HAVE DONE A RESPECTABLE JOB PICKING UP ON THE NORTHERN
EXTENT OF THE PRECIPITATION. HAVE THEREFORE LEANED TOWARD THOSE
TWO MODELS WITH RESPECT TO HOURLY POPS FOR TODAY. WHILE THE AREA
OF RAIN DOES SAG SLIGHTLY SOUTH-SOUTHEAST WITH TIME...THINK
LOCATIONS AS FAR NORTH AS THE INTERSTATE 94 CORRIDOR HAVE A DECENT
SHOT AT LEAST PICKING UP A HUNDREDTH OR TWO OF RAIN...SO DID
ADJUST THE 20-30 POP CHANCES ABOUT 50 MILES FARTHER NORTH. THE
RESPONSIBLE SHORTWAVE AND PV ADVECTION SHIFT OUT OF THE AREA
PRETTY EFFICIENTLY THIS MORNING...SO DO STILL EXPECT THE RAIN TO
END FOR THE AFTERNOON...WITH CLEARING SKIES COMMENCING
ACCORDINGLY. WITH WEAK COLD AIR ADVECTION IN THE WAKE OF THE
TROUGH...WILL SEE BELOW NORMAL HIGHS IN THE UPPER 50S TO LOWER
60S.

THE CONCERN FOR TONIGHT WILL THEN BECOME THE POTENTIAL FOR
FROST...AS SKIES CLEAR AND WINDS DECREASE/DECOUPLE. THE MOST
SUSCEPTIBLE AREA WILL BE CENTRAL/WEST CENTRAL WI...WHERE FORECAST
LOWS DIP INTO THE MID 30S. MAY EVENTUALLY NEED A FROST ADVISORY FOR
AREAS UP TOWARD RICE LAKE AND LADYSMITH IF 12Z RUNS SUPPORT CURRENT
WIND/SKY COVER/TEMP EXPECTATIONS.

.LONG TERM...(TUESDAY THROUGH SUNDAY)
ISSUED AT 330 AM CDT MON SEP 15 2014

WX MODELS CONTINUED TO ADVERTISE DRY CONDS THRU THURSDAY WITH
TEMPS NEAR OR SLIGHTLY BLW SEASONABLE NORMS. THE MEAN UPPER FLOW
WILL SLOWLY TRANSITION TO MORE ZONAL BY THE END OF THE WEEK...THEN
CHG AGAIN BY LATE IN THE WEEKEND AS A STRONG UPPER RIDGE BEGINS TO
BUILD OVER THE ROCKIES.

IN THE SHORT TERM...A WEAK BACKDOOR FRONT IS EXPECTED TO MOVE
SOUTHWARD ACROSS THE WESTERN GREAT LAKES BY WED. ONLY A WIND
SHIFT TO THE N/NE AND SLIGHTLY COOLER TEMPS WILL OCCUR WITH THIS
FRONT. STRONG RETURN FLOW WILL COMMENCE THURSDAY/FRIDAY LEADING TO
ABV NORMAL TEMPS AS THE SFC PRESSURE GRADIENT STRENGTHENS ALONG
THE HIGH PLAINS. THE STRENGTHENING PRESSURE GRADIENT IS DUE TO
STRONG HEIGHT FALLS AS A STORM SYSTEM BEGINS TO MOVE OUT OF THE
NORTHERN ROCKIES. THIS WILL SET THE STAGE FOR STRONG MOISTURE
ADVECTION ALONG THE FRONT FRIDAY. LATEST CIPS HAVE THE
POSSIBILITY OF 80 DEGREE TEMPS IN WESTERN MN FRIDAY AFTN...WITH
MID TO UPPER 70S IN THE EAST. IN ADDITION...SVR WX IS POSSIBLE
ESPECIALLY CONSIDERING THE STRONG JET INTERACTION WITH THE
MOISTURE RETURN.

AS DISCUSSED LAST NIGHT...ANALOG COMPOSITES FOR THE 6-10 AND 8-14
DAY EXTENDED PERIOD REMAIN FAVORABLE FOR A STRONG RIDGE BUILDING
ACROSS THE HIGH PLAINS...AND POSSIBLE INTO THE UPPER MIDWEST THE
WEEK OF SEPT 22ND. THIS IS IN RESPONSE TO STRONG HEIGHT FALLS IN
THE GULF OF ALASKA AND ANTICIPATED NORTHERN MOVEMENT OF THE UPPER
JET CORE. FOR NOW...WILL ONLY ADVERTISE A WARMUP FOR THE WEEK OF
SEPT 22ND...AND NOT GET TO EXCITED FOR THESE ABV NORMAL TEMPS TO
LAST FOR MORE THAN A FEW DAYS.

&&

.AVIATION...(FOR THE 12Z TAFS THROUGH 12Z TUESDAY MORNING)
ISSUED AT 650 AM CDT MON SEP 15 2014

LIGHT RAIN WILL AFFECT CENTRAL/SOUTHERN SITES /KRWF-KMSP-KRNH-
KEAU/ THIS MORNING...ALTHOUGH ASSOCIATED CIGS/VSBYS SHOULD BE
PRIMARILY VFR. IN THE WAKE OF THE RAIN...THE CLEARING OF THE BKN-
OVC CLOUD DECK CIRCA 6-7KFT WILL LAG BY A FEW HOURS. BY MID
AFTERNOON SHOULD SEE MOSTLY SUNNY SKIES. WINDS WILL BECOME
PREDOMINATELY NORTHWEST AT 7-10 KTS BY MID MORNING...THEN DECREASE
BELOW 5KTS AFTER 23Z AND BACK TO A SOUTHWEST DIRECTIONAL
COMPONENT THROUGH THE OVERNIGHT HOURS.

KMSP...
RAIN WILL END BY 15Z WITH CLOUDS CLEARING BY EARLY AFTERNOON.
NORTHWEST WINDS INCREASE TO AROUND 9KTS BY 18Z WITH GUSTS INTO THE
MID TEENS. SPEEDS DECREASE TO AOB 5 KTS AROUND 00Z AND BACK TO THE
SOUTHWEST.

/OUTLOOK FOR KMSP/
TUE...VFR. WINDS SW AT 5-10 KTS.
WED...VFR. WINDS VRB 5KTS.
THU...VFR. WINDS SE AT 10-12 KTS.

&&

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

$$


SHORT TERM...LS
LONG TERM...JLT
AVIATION...LS






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