River Flood Warning 11, NWS Sioux Falls, SD

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
315 AM CST FRI MAR 12 2010

.DISCUSSION...
WL CONT ADVY ACRS SWRN CWA THRU EXPIRATION OF 12Z AS WEB CAMS AND
SFC OBS CONT TO SHOW REDUCED VSBYS ALONG WITH AREAS OF SNOW. ALSO WL
CONT DENSE FOG ADVY ACRS SW MN THRU 15Z WHERE FOG IS WDSPRD...AND
LOCALLY DENSE. FOR NOW WL LEAVE NW IA OUT OF ADVY ALTHO AREAS OF
DENSE FOG CAN ALSO BE EXPECTED.

UPPER LOW OVR SW IA WL CONT TO DROP SEWD THRU SAT WITH WEAK LIFT
PERSISTING ACRS CWA ESPEC TODAY INTO THIS EVE. SO WL NEED TO KEEP
POPS FAIRLY HIGH ACRS CWA TODAY INTO EARLY EVE. WITH TEMPS ABOVE
FREEZING NOT MUCH THREAT FOR ACCUM SNOW...BUT WL KEEP THE MIX
MENTION FOR AT LEAST THIS MORNING...AND THEN RAIN THIS AFTN AS
WARMER AIR ALOFTS WRAPS SWWD ACRS CWA. PRECIP CHC SHUD DECREASE
OVERNIGHT AND MAY END UP JUST BEING AREAS OF DRIZZLE AND FOG MOST OF
NIGHT INTO SAT MORN. NOT MUCH RANGE IN DIRUNAL TEMPERATURES TODAY
AND TODAY WITH A 2 TO 5 DEGREE VAIANCE THRU THE PD.

DOESN'T LOOK TOO IMPRESSIVE FOR MUCH PRECIP ON SAT OR SUN BUT CUD
STILL SEE A STRAY LIGHT SHOWER OR 2 CLIP ERN CWA WITH CYC FLOW
ALOFT. THIS FLOW WL KEEP CWA CLOUDY OR MOCLDY THRU SUN. THIS WL HAVE
AN EFFECT ON TEMPS AND SLIGHTLY COOLER THAN GUID SEEMS THE WAY TO GO
AND INDICATED BY ENSEMBLE MOS GUID. NEXT S/W WL DROP SEWD ACRS CWA
ON MON AND MAY PRODUCE A FEW RW- AND WL KEEP LOP POPS ACRS ERN CWA
FOR NOW. THIS S/W SHUD HELP PUSH ALONG THE THIS STUBBORN UPPER LOW.
MOST OF NEXT WEEK LOOKS WARMER WITH ZONAL FLOW ALOFT...WITH ANOTHER
STORM PSBL BY NEXT WEEKEND.

&&

.AVIATION...

PERIODIC RAIN/SNOW WILL CONTINUE ACROSS THE REGION TODAY...WITH
GENERAL IFR CONDITIONS EXPECTED ACROSS THE AREA THROUGH 15Z.  WILL
SEE VISIBILITIES GENERALLY IMPROVE INTO THE MVFR RANGE AFTER THIS
TIME...THOUGH CIGS WILL REMAIN IN THE IFR RANGE. SUSTAINED
NORTHWESTERLY WINDS OF 15 TO 20 KTS...WITH HIGHER GUSTS...WILL
PERSIST FROM THE INTERSTATE 29 CORRIDOR WESTWARD THROUGH 00Z THIS
EVENING...BEFORE DIMINISHING TONIGHT.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
IA...NONE.

MN...DENSE FOG ADVISORY UNTIL 9 AM CST FRIDAY FOR
     MNZ072-080-081-089-090.

NE...NONE.

SD...WINTER WEATHER ADVISORY UNTIL 6 AM CST FRIDAY FOR
     SDZ050-057-063.

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
0406 AM CST FRI MAR 12 2010

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-131200-
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-
0406 AM CST FRI MAR 12 2010

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

.DAY ONE...TODAY AND TONIGHT

FLOODING...
FLOODING CAN BE EXPECTED ALONG THE JAMES RIVER...VERMILLION RIVER
AND LITTLE SIOUX RIVER UNTIL FURTHER NOTICE.

FOG...
WIDESPREAD DENSE FOG WILL PERSIST ACROSS SOUTHWEST MINNESOTA
THROUGH MID MORNING WITH AREAS OF DENSE FOG ACROSS NORTHWEST
IOWA.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER IS 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.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS
WEATHER OUTLOOK.