Freezing Rain Advisory 1, NWS Sioux Falls, SD

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
330 AM CST THU DEC 29 2005

.DISCUSSION...
COMPLICATED FCST THE NEXT FEW DAYS. FIRST PBLM IS DENSE FOG MAINLY E
OF JAMES RVR VALLEY. WITH LLM TRAPPED BLO INVERSION AND LOW LEVEL
SELY FLOW DVLPNG...WUD EXPECT DENSE FOG TO STAY AROUND FOR AWHILE
THIS MORN...SO HAVE EXPANDED AND CONTINUED THRU 15Z.

NOW WE MOVE ON TO S/W CURRENTLY OVR THE NRN ROCKIES. MODELS IN FAIR
AGGREEMENT WITH THIS S/W DIGGING ACRS THE NRN PLAINS THIS AFTN AND
TONIGHT WITH SFC LOW TRACKING ACRS SRN SD TODAY AND THIS EVE AND
ALONG THE MN/IA BORDER TONIGHT AND FRI. PRECIP SHUD START AS RAIN
WITH WARM AIR ALOFT AHEAD OF SYS. CONCERN IS WHETHER PRECIP MAY
START OF ZR- ERN CWA. THIS IS PSBL...BUT LOW LEVELS WL WARM INTO MID
TO UPPER 30S FAIRLY QUICKLY ONE LIGHT RAIN STARTS...SO DO NOT EXPECT
MUCH ZR-. STG HGT FALLS WITH S/W AND WUD EXPECT RAIN TO CHANGE OVER
TO SNOW FAIRLY QUICKLY FM WEST TO E TONIGHT...WITH BEST LIFT N OF
I90 AND BEST CHC OF ACCUM SNOW NE OF A HON-OTG LINE TONIGHT INTO SAT
MORN. SYS IS MOVG QUICKLY BUT A SWAT OF 4 INCHES IS QUITE LIKELY IN
THIS AREA. SO HAVE GONE WITH A SNOW ADVY FOR THESE AREAS. WINDS SHUD
PICK UP ACRS THE W AND S AS SFC LOW DEEPENS. WL NOT GO WITH ANY WND
ADVY ATTM BUT SWRN CWA CUD COME CLOSE LATER TONIGHT.

UPPER LOW WL MOVE INTO WRN GREAT LAKES REGION BY FRI EVE...SO WUD
EXPECT PLENTY OF CLDS AND A CHC OF LIGHT SNOW ACRS CWA ON FRI.
FAIRLY COLD AIR WL FUNNEL INTO CWA FRI AND HAVE LOWERED MAX TEMPS
ACRS CWA.

SHUD BE FAIRLY QUITE ON SAT WITH TEMPS STILL ABOVE NORM...BUT WL
SHADE BACK A FEW DEG AS LOW LEVEL SELY FLOW DEVELOPS. WL NOT CHANGE
LATER PDS TOO MUCH...BUT WL SPEED UP CHC OF PRECIP ON TUES. WL KEEP
CHC OF PRECIP SUN AS DECENT S/W MOVES ACRS THE PLAINS. AIRMASS MAY
BE WARM ENUF FOR A MIC OF LIGHT RAIN OR LIGHT SNOW...BEFORE CHANGING
OVR TO SNOW IN THE EVE. ACTIVE WX PATTERN WITH WLYS INTO NEXT
WEEK...BUT TEMPS WL STILL REMAIN ABOVE NORM.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
IA...DENSE FOG ADVISORY UNTIL 9 AM CST THIS MORNING FOR
     IAZ001-IAZ002-IAZ003-IAZ012-IAZ013-IAZ020-IAZ031.
MN...DENSE FOG ADVISORY UNTIL 9 AM CST THIS MORNING FOR
     MNZ071-MNZ072-MNZ080-MNZ081-MNZ089-MNZ090-MNZ097-MNZ098.
     SNOW ADVISORY FROM MIDNIGHT TONIGHT TO 9 AM CST FRIDAY FOR
     MNZ071-MNZ072-MNZ080-MNZ081.
NE...DENSE FOG ADVISORY UNTIL 9 AM CST THIS MORNING FOR
     NEZ013-NEZ014.
SD...DENSE FOG ADVISORY UNTIL 9 AM CST THIS MORNING FOR
     SDZ040-SDZ055-
     SDZ056-SDZ061-SDZ062-SDZ066-SDZ067-SDZ069-SDZ070-SDZ071.
     SNOW ADVISORY FROM 9 PM THIS EVENING TO 6 AM CST FRIDAY
     FOR SDZ038-SDZ039-SDZ040.

&&

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