Blizzard in Nebraska, November 28 to 29, 2005

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1055 AM CST MON NOV 28 2005

.DISCUSSION...
MAJOR WINTER STORM UNDERWAY...WITH MAIN UPPER SYSTEM SWINGING NWRD
ACRS CNTRL IA. WELL DEFINED DRY SLOT PUSHING NWRD AND WWRD INTO FAR
SERN SD THIS MORNING...CUTTING BACK ON PCPN INTENSITY...WITH
SECONDARY AREA OF PRECIPITATION NEAR THE UPPER LOW CORE IN IA.
A REAL MIXED BAG EARLIER ON WITH EVERY TYPE UNDER THE SUN NOTED FROM
BKX TO FSD TO YKN AND WWRD...UNTIL MAINLY S ACRS FAR W...AND WARM
ENOUGH FOR RAIN E.  REPORTS E OF THE JAMES VALLEY ARE OF VERY LITTLE
SNOWFALL SO FAR...MAINLY A DUSTING WITH MORE IN FORM OF ICE/SLEET.
SUCH ARE THE ANTECEDENT CONDITIONS HEADING INTO THE REST OF THE DAY.

FOR THE SHORT TERM...WL CONTINUE TO BACK LOWER POPS WWRD THRU THE
REMAINDER OF THE MORNING...BEFORE LIMITING ROTATION OF BAND SETS UP
MORE PERSISTENT AREA OF PRECIP JUST OF KFSD. THE LOWER I29 CORRIDOR
APPEARS TO BE MORE OF THE GENERATION AREA ON EDGE OF DRY SLOT FOR
THAT WHICH WILL MOVE INTO THE BAND TO THE W.  WL LKLY FIND A
CONSIDERABLE SNOWFALL GRADIENT ALG ERN EDGE OF WARNING AREA...WHICH
SHUD BEGIN TO COLLAPSE SEWRD AS UPR LOW LIFTS BY LTR IN AFTN.

ONE ISSUES THAT IS INDISPUTABLE WITH THIS STORM IS THE WIND...WHICH
HAS ALREADY BEEN GUSTING TO AROUND 60 MPH ACRS THE WRN CWA. REPORTS
ARE DISMAL FOR CONDITIONS THERE...AND WILL NOT GET ANY BETTER THRU
THE AFTN WITH STRONGEST WIND SUPPORT LOCATED ON WRN FLANK OF
FRONTOGENETIC BAND.  WITH SNOWFALL ALREADY IN PLACE ARND YKN...SEE
NO REASON NOT TO ADD INTO THE BLIZZARD WARNING. MUCH OF THE WINTER
STORM WARNING AREA TO E WL EVENTUALLY GET ENOUGH SNOWFALL BY LATER
IN AFTN.  REFINED GRIDS ALREADY SENT...WITH ONE OF THE MORE SIG
CHANGES TO INCREASE EVENING WINDS.

&&

.PREV DISCUSSION...
STG SYS MOVG UP STILL KEEPNG IT MILD ERN CWA BUT GNRLY COOLNG
GETTING GOING TO THE W. CHANGEOVER TO SNW SHUD PROCEED VERY QUICKLY
NEXT FEW HRS OVER SD...THEN PROCEED MORE SLWLY ACRS SWRN MN AND NWRN
IA. SOME ZR WILL CONT NEXT FEW HRS BUT EVENTUALLY THAT SHUD
DISAPPEAR. WITH TIMING OF PCPN...WARNGS LOOK VERY GOOD WHERE WE HAVE
THEM NOW WITH SOME ADJUSTMENTS IN STARTING TIMES FOR WHEN CONDS WILL
BE GETTNG BAD...AND MORE IMPORTANTLY THE UPGRADE TO BLIZZARD WARNG
ALG AND W OF JAMES RVR...GOING E OF RVR TO KINGSBURY CO UP NORTH.
WITH EXPCTED SNW AND INCRG VERY STG WNDS WE HAVE BEEN ALL BUT SAYING
THIS ANYWAY. NOW WITH WIDESPRD PCPN BACKNG UP AS EXPCTED TO THE W
FROM ERN CWA... INDICATNS BCM STGR AND BEST TO GO WITH THE WORST SO
TO SPEAK. WILL KEEP WNTR STRM WARNG AS SUCH FRTHR E INCLUDG FSD WITH
A LTL LATR ONSET AND LESSER SNW AMNTS...WNTR WX ADVY INTO MN AND IA
FOR SOME SNW AND BS LATR TDA...AN WILL KEEP NO HILITE FAR SE FROM
SLB TO SPW. WND ADVY THERE A PSBLTY BUT THAT WUDNT BE TILL END OF
DAY ANYWAY SO WILL HOLD OFF.

WILL KEEP HILITES TIL MDNGT AS WE HAVE BEEN WITH WNDS DCRG SLWLY BUT
STEADILY TNGT AND SOME LINGRNG LGT SNW MAINLY NE.

WILL GET RID OF LINGRNG LGT SNW BY MIDMORNING TUE...OTRW TUE SHUD
BRING DCRG CLDS AND CONTD DCRG WNDS WITH SOME WNDY CONDS STILL IN
ERN FCST AREA.

WED SYS STILL LOOKS ABOUT THE SAME. SOME MODELS SUCH AS ETA AND EVEN
GFS HAVE SYS PRETTY WEAK BUT THINK IT HAS POTENTL TO BE BETTER THAN
THEY SHOW. THIS EVEN SEEMS TO BE HINTED AT BY 00Z 48 HR NGM.

AFTER ENDING LINGRING SNW FROM THIS SYS BY THU MRNG...WILL GO WITH
DRY FOR REST OF FCST INCLUDG THRU NEXT WEEKEND. GFS SHOWS POTNTL SYS
BY SUN OR MON BUT CANADIAN SHOWS SOMETHING COMPLETELY DIFFERENT AND
WIL NOT INTRO PCPN AT THIS TIME...INCLUDING PRELIM NEW DAY 7 GRIDS
FOR NEXT MON. COLD TEMPS AFTER WED SYS WILL MODERATE BY WEEKEND BUT
DONT EXPECT IT TO GET TOO BALMY...SHUD BE A DECENT ICE FORMING PD
COMING UP FOR ALL THE ITCHY ICE FISHERMEN ARND.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...

SD...BLIZZARD WARNING THRU MIDNIGHT TNGT DE SMET TO YANKTON LINE
     AND W.
     WINTER STORM WARNING MID MRNG THRU MIDNIGHT TNGT E OF ABV LINE
     XCP UNION CO IN XTRM SERN SD.
     WINTER WX ADVY LATE MRNG THRU MIDNIGHT TNGT UNION CO.
MN...WINTER STORM WARNING MID MRNG THRU MIDNIGHT TNGT LINCOLN CO.
     WINTER WX ADVISORY LATE MRNG THRU MIDNIGHT TNGT SWRN MN OUTSIDE
     OF LINCOLN CO.
IA...WINTER WX ADVY LATE MRNG THRU MIDNIGHT TNGT SIOUX CITY TO
     ROCK RAPIDS TO SPIRIT LAKE...OR WRN AND NRN PARTS OF NWRN IA.

&&

CHAPMAN/WILLIAMS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
0538 AM CST MON NOV 28 2005

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-291200-
AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA-
CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE-
DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON-
IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN-
LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN-
OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN-
SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON-
0538 AM CST MON NOV 28 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA...
SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA.

.DAY ONE...TODAY AND TONIGHT

WINTER WEATHER...
A WINTER STORM WILL BRING HEAVY SNOW AND BLIZZARD CONDITIONS TO
AREAS NEAR AND WEST OF THE JAMES RIVER TODAY. THE SNOW WILL BE ON
TOP OF HEAVY ICING THAT TOOK PLACE IN PART OF THE AREA DURING THE
NIGHT. FURTHER EAST IN SOUTH DAKOTA...RAIN FREEZING RAIN AND SNOW
WILL QUICKLY CHANGE TO SNOW THIS MORNING WITH HEAVY SNOW
ACCUMULATIONS AND BLOWING SNOW EXPECTED BY AFTERNOON. BLIZZARD
AND WINTER STORM WARNINGS ARE IN EFFECT FOR SOUTHEAST SOUTH
DAKOTA AND TRAVEL WILL BE VERY DIFFICULT OR IMPOSSIBLE.

IN SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND EXTREME NORTHEAST
NEBRASKA...RAIN WILL CHANGE TO SNOW DURING THE DAY. A FEW INCHES
OF SNOW ACCOMPANIED BY BLOWING SNOW CAN BE EXPECTED...WITH THE
MOST ACCUMULATIONS IN AREAS NEAR SOUTH DAKOTA. TRAVEL WILL BECOME
HAZARDOUS. A WINTER WEATHER ADVISORY IS IN EFFECT FOR MUCH OF THE
AREA.

SNOW IS EXPECTED TO DECREASE RAPIDLY BY EARLY EVENING...ALTHOUGH
LIGHT SNOW ACCUMULATIONS AND BLOWING SNOW WILL CONTINUE IN AREAS.
ONLY VERY LIGHT SNOW IS EXPECTED AFTER MIDNIGHT.

WIND AND FOG...
STRONG WINDS OVER SOUTHEAST SOUTH DAKOTA WILL GRADUALLY SPREAD
INTO SOUTHWEST MINNESOTA AND NORTHWEST IOWA BY THE END OF THE
DAY. SUSTAINED WINDS ARE EXPECTED TO REACH AT LEAST 30 MPH. GUSTS
AROUND 45 MPH CAN BE EXPECTED IN THE BLIZZARD WARNING AREA NEAR
AND WEST OF THE JAMES RIVER.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

LOW PRESSURE MOVING ACROSS THE AREA FROM THE WEST MAY BRING SNOW
ACCUMULATIONS WEDNESDAY AND WEDNESDAY NIGHT. HEAVY SNOW IS NOT
EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.

&&

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT
WWW.CRH.NOAA.GOV/FSD. THIS INCLUDES THE GRAPHICAL HAZARDOUS
WEATHER OUTLOOK.

WILLIAMS