Area Forecast Discussion
Issued by NWS Sioux Falls, SD

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380
FXUS63 KFSD 082321
AFDFSD

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SIOUX FALLS SD
521 PM CST MON FEB 8 2016

.SHORT TERM...(THIS EVENING THROUGH TUESDAY)
ISSUED AT 303 PM CST MON FEB 8 2016

STRONG WINDS AND PERSISTENT LIGHT SNOWS CONTINUE TO CAUSE SIGNIFICANT
TRAVEL ISSUES IN THE TRI-STATE AREA THIS AFTERNOON.  WHILE EXTREMELY
STRONG WINDS HAVE BEEN ON A DOWNWARD TREND...WE ARE CONTINUING TO
SEE WIND GUSTS APPROACHING 40 MPH OVER THE EASTERN CWA AS WINDS AT
THE TOP OF THE MIXED LAYER REMAIN NEAR 50 KNOTS. CONTINUED
CONVECTIVE STREAMERS OF STRATUS MOVING ACROSS THE REGION ARE HAVING
NO ISSUES PRODUCING SNOWFLAKES...AS THE MAJORITY OF THE LAYER
RESIDES IN THE DGZ.

TRENDS INTO THE EVENING CONTINUE TO SUGGEST WEAKENING WINDS...ALBEIT
VERY SLOWLY. HAVE CONCERNS THAT WE MAY LIKELY STAY WELL MIXED
THROUGH THE OVERNIGHT HOURS...ESPECIALLY AREAS EAST OF I-90...WITH
RAP/HRRR SOUNDINGS INDICATING THE POTENTIAL FOR 40 KNOT GUSTS ALL
THE WAY UNTIL MIDNIGHT ESPECIALLY OVER THE BUFFALO RIDGE. THERE IS
ALSO THE POSSIBILITY THAT ANY REMAINING STRATO-CU IN THE AREA WILL
PRODUCE SNOW FLURRIES. WILL BE ISSUING AN ADVISORY FOR AREAS
CURRENTLY IN A BLIZZARD WARNING THROUGH MIDNIGHT SO AS TO NOT
ADVERTISE ANY DRASTICALLY IMPROVING CONDITIONS ONCE BLIZZARD
WARNING EXPIRES AT 00Z.

SURFACE RIDGING WILL ATTEMPT TO SLIDE EASTWARD ON TUESDAY...WITH
ANOTHER BREEZY DAY OVER MINNESOTA/IOWA. HAVE INCLUDED PATCHY BLOWING
SNOW AS GUSTS APPROACHING 30 MPH CONTINUE TO BE POSSIBLE THROUGH
EARLY AFTERNOON.  HIGHS ON TUESDAY WILL STRUGGLE TO REACH 20 DEGREES
EAST OF THE JAMES RIVER VALLEY...WITH HIGHS APPROACHING 30 TOWARD TO
MO RIVER VALLEY.

.LONG TERM...(TUESDAY NIGHT THROUGH MONDAY)
ISSUED AT 303 PM CST MON FEB 8 2016

NORTHWESTERLY UPPER LEVEL FLOW REMAINS LOCKED IN PLACE FOR THE
REMAINDER OF THE WEEK. THE BIG QUESTION WILL BE WHERE THE BAROCLINIC
BOUNDARY SETS UP ACROSS THE DAKOTAS.

MODELS REMAIN UNCERTAIN REGARDING HOW FAR EAST THE BOUNDARY WILL SET
UP INTO TUESDAY EVENING...WITH POTENTIAL IMPACT ACROSS NORTHWEST
INTO SOUTH CENTRAL SOUTH DAKOTA AT LEAST THROUGH THE EARLY MORNING
HOURS. THINK THAT THERE IS ENOUGH WEAK LOW LEVEL LIFT FOR SOME LIGHT
SNOW OR FLURRIES ALONG OUR FAR WESTERN BORDER. STRONGER FORCING AND
LIFT ARRIVES WEDNESDAY MORNING AS AN APPROACHING SHORTWAVE DIVES
SOUTHWARD AND THE BAROCLINIC ZONE ADVANCES EAST INTO SOUTHEAST SD.
MODELS ARE IN BETTER AGREEMENT WITH PLACEMENT OF THIS FEATURE...WITH
LIGHT SNOW FORMING ALONG AND EAST OF THE JAMES RIVES AS THE MID
LEVEL WAVE APPROACHES... HOWEVER THE ECMWF IS ABOUT 6 HOURS QUICKER
WITH THE ONSET THAN THE REST OF THE OPERATIONAL MODELS. SNOW EXITS
THE AREA LATE WEDNESDAY AFTERNOON INTO WEDNESDAY EVENING...AND COULD
PRODUCE A QUICK INCH OR SO OF ACCUMULATION WITH SOME FAIRLY HIGH
SNOW RATIOS IN OUR EASTERN HALF. THE HIGH TEMPERATURE GRADIENT WILL
BE SUBSTANTIAL FROM WEST TO EAST...RANGING FROM HIGHS NEAR 10 ALONG
OUR EASTERN BORDER...TO THE LOWER OR MID 30S IN SOUTH CENTRAL SD.

WE POTENTIALLY SEE ANOTHER WAVE DROPPING SOUTHEAST THROUGH THE
NORTHERN PLAINS ON THURSDAY NIGHT INTO FRIDAY...BUT WILL KEEP
MENTION OF ONLY SLIGHT CHANCE POPS WITH UNCERTAINTY IN THE LOCATION
OF THE BOUNDARY AND TIMING ISSUES. THE GFS KEEPS THE AREA LARGELY
DRY WHILE THE GEM AND ECMWF DEVELOP LIGHT SNOW. IT DOES APPEAR THAT
THIS FEATURE WILL BRING A REINFORCING SHOT OF COOLER AIR...WITH LOWS
DROPPING WELL BELOW ZERO FRIDAY NIGHT.

UPPER RIDGING TO OUR WEST FINALLY ADVANCES INTO THE HIGH PLAINS
LATER SATURDAY INTO EARLY NEXT WEEK. TEMPERATURES WILL LIKELY WARM
OVERNIGHT SATURDAY NIGHT...LEADING INTO MUCH WARMER TEMPERATURES
SUNDAY AND MONDAY.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z TUESDAY EVENING)
ISSUED AT 516 PM CST MON FEB 8 2016

VFR CONDITIONS EXPECTED AT TAF SITES THROUGH THE TAF PERIOD AS
NORTHWESTERLY WINDS SLOWLY DIMINISH THROUGH TOMORROW. FARTHER TO
THE EAST THROUGH SOUTHWESTERN MINNESOTA AND PORTIONS OF NORTHWEST
IOWA...STILL COULD HAVE SCATTERED SNOW SHOWERS THROUGH MID
EVENING BEFORE ENDING LATE. WINDS WILL REMAIN STRONGER OVER THIS
AREA AND WILL RESULT IN PERIODIC REDUCTIONS IN VISIBILITIES IN
PATCHY BLOWING SNOW INTO TUESDAY.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...WINTER WEATHER ADVISORY UNTIL 6 PM CST THIS EVENING FOR SDZ040-
     055-056-062-067-071.

     WIND ADVISORY UNTIL 6 PM CST THIS EVENING FOR SDZ039-054-060-061-
     065-066-068>070.

MN...WINTER WEATHER ADVISORY UNTIL 6 PM CST THIS EVENING FOR MNZ098.

     WINTER WEATHER ADVISORY UNTIL MIDNIGHT CST TONIGHT FOR MNZ071-
     072-080-081-089-090-097.

     BLIZZARD WARNING UNTIL 6 PM CST THIS EVENING FOR MNZ071-072-080-
     081-089-090-097.

IA...WINTER WEATHER ADVISORY UNTIL 6 PM CST THIS EVENING FOR IAZ001-
     012-020-031.

     WINTER WEATHER ADVISORY UNTIL MIDNIGHT CST TONIGHT FOR IAZ002-
     003-013-014-021-022-032.

     BLIZZARD WARNING UNTIL 6 PM CST THIS EVENING FOR IAZ002-003-013-
     014-021-022-032.

NE...WINTER WEATHER ADVISORY UNTIL 6 PM CST THIS EVENING FOR NEZ014.

     WIND ADVISORY UNTIL 6 PM CST THIS EVENING FOR NEZ013.

&&

$$

SHORT TERM...DUX
LONG TERM...
AVIATION...JM



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