Area Forecast Discussion
Issued by NWS Twin Cities, MN

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936
FXUS63 KMPX 090026
AFDMPX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
626 PM CST MON FEB 8 2016

.UPDATE...
ISSUED AT 625 PM CST MON FEB 8 2016

UPDATED TO INCLUDE 00Z AVIATION DISCUSSION BELOW.

&&

.SHORT TERM...(THIS EVENING THROUGH TUESDAY)
ISSUED AT 258 PM CST MON FEB 8 2016

CONDITIONS HAVE SLOWLY IMPROVED ACROSS SC/SW/WC MN
SINCE NOON...ESPECIALLY WHERE BLIZZARD CONDITIONS HAD OCCURRED
BETWEEN REDWOOD FALLS...NEW ULM...ST. JAMES AND FAIRMONT. SEVERAL
HIGHWAYS IN SW MN AND I-90 WERE CLOSED THIS MORNING DUE TO SEVERE
BLOWING AND DRIFTING SNOW ALONG WITH NUMEROUS CAR ACCIDENTS. WEB
CAMS IN THESE AREA DOES SHOW IMPROVEMENT...AND WITH WIND SPEEDS
EXPECTED TO DIMINISH SOME BY THE EVENING...THE BLIZZARD WARNING WILL
LIKELY BE ALLOWED TO EXPIRE AT 6 PM. ALTHOUGH "BLIZZARD" CONDITIONS
MAY NOT BE REALIZED...AREAS OF BLOWING AND DRIFTING SNOW WILL
CONTINUE DUE TO WIND SPEEDS AROUND 20-30 MPH OVERNIGHT/TUESDAY. I
WOULDN/T BE SURPRISED IF A WINTER WEATHER ADVISORY IS REPLACED WITH
THE BLIZZARD WARNING THIS EVENING. ELSEWHERE...ONLY PATCHY BLOWING
SNOW IS EXPECTED WITH SKIES SLOWLY BECOMING CLEAR FROM NW TO SE.
OCCASIONAL SNOW SHOWERS WILL CONTINUE IN FAR EC MN/WC WI DURING THE
EVENING DUE TO THE PERSISTENT DEEP DENDRITIC GROWTH ZONE...AMPLE
MOISTURE AND MARGINAL LIFT. TEMPS OVERNIGHT WILL BE DEPENDENT ON THE
AMOUNT OF SKY COVER...ESPECIALLY TOWARD MORNING. A FEW BELOW ZERO
READINGS ARE LIKELY IN CENTRAL MN BY DAYBREAK...WITH SINGLE DIGITS
ABOVE ZERO ELSEWHERE. TUESDAY TEMPS WITH CONTINUED STRONG CAA WILL
LEAD TO HIGHS A FEW DEGREES COOLER THAN TODAY WITH READINGS ONLY
REACHING THE UPPER SINGLE DIGITS...TO LOWER TEENS.

.LONG TERM...(TUESDAY NIGHT THROUGH MONDAY)
ISSUED AT 258 PM CST MON FEB 8 2016

THE MAIN THEME IN THE LONG TERM IS BELOW NORMAL TEMPERATURES. THE
DOWNWARD TREND IS ALREADY IN PLACE AND WILL BE REINFORCED DURING
THE WEEK AHEAD WITH SEVERAL SURGES OF ARCTIC AIR. AFTER SEVERAL
DAYS LATE LAST WEEK AND THIS PAST WEEKEND WHERE TEMPERATURES
AVERAGED SOME 10 TO 15 DEGREES ABOVE NORMAL...MUCH OF THE LONG
TERM WILL FEATURE DAYS AVERAGING BETWEEN 10 TO 15 DEGREES BELOW
NORMAL. THE COLDEST DAY LOOKS TO BE SATURDAY WITH MORNING LOWS
FROM 5 BELOW TO 15 BELOW ZERO WITH HIGHS IN THE SINGLE DIGITS.
MODERATION WILL BEGIN ON SUNDAY WITH TEMPERATURES THEN TRENDING
ABOVE NORMAL FOR EARLY NEXT WEEK.

ON THE WEATHER FRONT...THERE ARE THREE SNOW EVENTS DURING THE LONG
TERM. THE FIRST IS ON WEDNESDAY...THE SECOND THURSDAY NIGHT AND
EARLY FRIDAY WITH THE THIRD FROM SUNDAY INTO MONDAY. THE FIRST
TWO SNOW EVENTS LOOK TO BE LIGHT AND MAINLY AFFECT WEST CENTRAL
THROUGH SOUTH CENTRAL MN. WE ENDED UP ADDING POPS FOR WEDNESDAY AS
THE ECMWF CAME FURTHER EAST WITH THE WAVE SLIDING DOWN THE SPINE
OF MN AND WAS IN VERY CLOSE AGREEMENT WITH THE PAST TWO RUNS OF
THE GFS. SNOW AMOUNTS ARE IN THE NEIGHBORHOOD OF ONE INCH FROM
MADISON TO FAIRMONT.

THE SECOND WAVE IN THE NORTHWEST FLOW PASSES BY THURSDAY NIGHT AND
EARLY FRIDAY. IT IS ON ABOUT THE SAME TRAJECTORY AS THE WEDNESDAY
ONE. THIS TIME THE ECMWF IS A LITTLE STRONGER THAN THE GFS. PARTS
OF THE MN RIVER VALLEY COULD SEE UP TO AN INCH OF SNOW ACCUMULATION.

AGREEMENT BETWEEN THE GFS AND ECMWF DIVERGE FOR THE WEEKEND AS THE
FLOW PATTERN CHANGES ALOFT. THE GFS WOULD SWITCH RATHER QUICKLY TO
A MORE WESTERLY FLOW WITH A WEAKER INCOMING WAVE THAT KEEPS MUCH
OF THE PRECIPITATION STAYING MORE TO THE NORTH AND EAST OF THE
TWIN CITIES FROM SUNDAY INTO MONDAY. THE ECMWF IS SLOWER ON
BACKING THE UPPER FLOW TO THE WEST AS IT BRINGS A CLOSED LOW DOWN
ACROSS MN AND IA. THIS TRANSLATES INTO SNOW FOR AREAS MAINLY WEST
AND SOUTH OF THE TWIN CITIES. WITH THIS BEING DAYS 6 AND 7...WE
OPTED TO HAVE SLIGHT CHANCE POPS ACROSS THE MN CWA WITH 25-30
POPS ACROSS MUCH OF THE WI CWA.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z TUESDAY EVENING)
ISSUED AT 625 PM CST MON FEB 8 2016

WANING VISIBLE AND ARRIVING FOG IMAGERY CONTINUE TO SHOW QUITE A
BIT OF MAINLY MVFR CEILINGS ACROSS THE AREA. WITH CYCLONIC
BOUNDARY LAYER FLOW PERSISTING... AND PLENTY OF BOUNDARY LAYER
MOISTURE REMAINING... CEILING SHOULD STICK AROUND FOR A WHILE YET.
THINGS LOOK TO SCATTER OUT FROM NORTHWEST TO SOUTHEAST... BUT THE
TIMING OF THAT IS STILL SOMEWHAT UNCERTAIN. CHOSE TO GO THE
SOMEWHAT MORE PESSIMISTIC ROUTE... WHICH IS ACTUALLY IN REASONABLE
AGREEMENT WITH THE LATEST LAMP. THIS WILL KEEP CEILINGS IN PLACE
THROUGH THE OVERNIGHT FOR MOST LOCATIONS... AND MAINLY IN THE MVFR
CATEGORY. DON/T EXPECT TOO MUCH IN THE WAY OF MVFR VISIBILITIES
WITH BOTH FALLING AND BLOWING SNOW ON THE DECREASE... BUT DID
INCLUDE SOME FOR A WHILE YET... AND MAY NEED TO EXTEND THINGS
DEPENDING ON HOW THE NEXT SEVERAL HOURS GO.

KMSP...MAIN UNCERTAINTIES ARE WITH HOW LONG CEILINGS WILL
PERSIST... AND WHETHER THEY WILL BE ABOVE OR BELOW 3K FT AGL. WITH
THE INVERSION LOWERING AND THE GENERALLY EXPECTED NOCTURNAL
TRENDS... DID BRING THINGS BACK INTO MVFR... AND DIDN/T ALLOW
THINGS TO SCATTER OUT UNTIL TUESDAY MORNING. UPSTREAM TRENDS
CERTAINLY SUPPORT CEILINGS STICKING AROUND FOR A WHILE YET... SO
FEEL REASONABLY CONFIDENT IN THAT EXPECTATION THROUGH AT LEAST
06-09Z. WE COULD SEE SOME FALLING SNOW WORK BACK IN LATER THIS
EVENING... IN WHICH CASE SOME AMENDMENTS MAY BE NEEDED TO INCLUDE
SOME SLIGHTLY LOWER VISIBILITIES.

/OUTLOOK FOR KMSP/
TUESDAY OVERNIGHT...VFR. NORTHWEST WIND 5 TO 15 KT.
WEDNESDAY...VFR. NORTH WIND LESS THAN 10 KT.
WEDNESDAY NIGHT...VFR. NORTH WIND LESS THAN 10 KT.
THURSDAY...VFR. VARIABLE WIND LESS THAN 10 KT.
THURSDAY NIGHT...MVFR CEILINGS AND VISIBILITIES POSSIBLE WITH A
CHANCE OF SNOW. WEST WIND 5 TO 10 KT.
FRIDAY...MVFR CEILINGS AND VISIBILITIES POSSIBLE EARLY WITH A
CHANCE OF SNOW. NORTHWEST WIND 10 TO 20 KT.

&&

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

$$

UPDATE...
SHORT TERM...JLT
LONG TERM...RAH
AVIATION...



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