Cold in Minnesota, December 10, 2009

Name: Cold in Minnesota, December 10, 2009
Start: 2009-12-10T00:00
End: 2009-12-10T11:00
Location: Minnesota

December 10, 2009 · NWS ARX · 7 events in 7 counties and zones

Strong winds and plummeting temperatures combined to create wind chills of 20 below to 30 below on December 10 in the wake of a large winter storm.

Where it happened

Every event with a place to put it; 7 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 7

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS ARX wrote it up.

Strong winds and plummeting temperatures combined to create wind chills of 20 below to 30 below on December 10 in the wake of a large winter storm.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS La Crosse, WI wrote its last area forecast discussion before the first event at Dec 9, 3:49 PM CST, 8 hours 11 minutes earlier.

Area forecast discussion, Dec 9, 3:49 PM CST, 8 hours 11 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LA CROSSE WI
349 PM CST WED DEC 9 2009

.SHORT TERM...TONIGHT THROUGH SATURDAY

MAIN FORECAST CONCERN IS ONGOING HAZARDS AS WELL AS LOW WIND CHILLS
TONIGHT THROUGH THURSDAY NIGHT

CURRENTLY AS OF 21Z...WATER VAPOR LOOP AND RUC 500MB HEIGHT ANALYSIS
SHOWED A HIGHLY AMPLIFIED RIDGE OVER THE EAST PACIFIC INTO EASTERN
ALASKA...THEN TROUGHING PRETTY MUCH DOMINATING THE REST OF NORTH
AMERICA. WITHIN THIS TROUGH...A 513 DAM UPPER LOW WAS LOCATED OVER
NORTHERN LOWER MICHIGAN...A SHORTWAVE WAS OVER CENTRAL MONTANA...AND
A POLAR VORTEX WAS DROPPING SOUTH THROUGH THE NUNAVUT REGION OF
CANADA. ASSOCIATED WITH THE UPPER LOW WAS A 975MB LOW NEAR ALPENA
MICHIGAN. TIGHT PRESSURE GRADIENT EXISTS WEST OF THE LOW BACK INTO
WESTERN MINNESOTA AND IOWA....WHICH HAS HELPED KEEP WIND SPEEDS UP
THROUGH THE DAY. WINDS ARE STARTING TO SLOWLY COME DOWN OFF THEIR
HIGHS...WHICH CAN BE SEEN IN THE MKEPNSARX STATEMENTS. PLENTY OF
SNOWFALL WAS OBSERVED FROM THE LOW PRESSURE SYSTEM...WITH AMOUNTS
RANGING FROM 8 TO 17 INCHES. A LITTLE LIGHT SNOW STILL LINGERS OVER
THE FORECAST AREA...LEFTOVER FROM THE DIMINISHING DEFORMATION ZONE.
WITH THE SNOW DIMINISHING AND FALLEN SNOW SETTLING...THE AMOUNT OF
BLOWING SNOW HAS DIMINISHED AS WELL. LOWEST VISIBILITIES ARE IN
EXPOSED AREAS ACROSS SOUTHEAST MINNESOTA AND NORTHEAST IOWA...WHERE
OBS ARE REPORTING AROUND ONE HALF OF A MILE. FARTHER TO THE
WEST...HIGH PRESSURE SITS OVER THE PLAINS. AIRMASS IS QUITE
CHILLY...AIDED BY EXTENSIVE SNOWPACK NOW OVER THE PLAINS...WITH
DEVILS LAKE NORTH DAKOTA ONLY -8F AT 21Z. THIS COLD AIR HAS BEEN
FILTERING IN ON THE BLUSTERY NORTHWEST WINDS.

TONIGHT...UPPER AND SURFACE LOWS OVER LOWER MICHIGAN WILL LIFT UP
INTO WESTERN QUEBEC BY 12Z THURSDAY...ALLOWING SNOW TO FURTHER
DIMINISH AND THE PRESSURE GRADIENT TO CONTINUE TO RELAX. HOWEVER...
THE WINDS ARE NOT GOING TO GO COMPLETELY CALM...SINCE THE RIDGE OVER
THE PLAINS IS PROGGED TO MOSTLY DROP TO THE SOUTH. IN FACT...A
NORTHWEST LOW LEVEL FLOW SHOULD PERSIST...ADVECTING THE COLDER AIR
OVER THE DAKOTAS INTO THE FORECAST AREA. OVERALL GOING LOWS LOOKED
GOOD BASED ON UPSTREAM READINGS AND LATEST GUIDANCE. WITH THE WINDS
STAYING UP AND TEMPERATURES EXPECTED TO FALL INTO THE SINGLE DIGITS
BELOW ZERO IN MOST LOCATIONS...WIND CHILLS SHOULD DROP TO 15 TO 25
BELOW BY 12Z...POSSIBLY EVEN REACHING 30 BELOW IN THE ROCHESTER
AREA. AS FAR AS HAZARDS GO...SINCE NONE OF THE EXPOSED METAR SITES
ACROSS THE REGION HAVE REPORTED BLIZZARD CONDITIONS IN THE PAST
COUPLE OF HOURS...DECIDED TO CANCEL THE BLIZZARD WARNING. AT LEAST
FOR SOUTHEAST MINNESOTA AND NORTHEAST IOWA...WHERE WINDS ARE
STRONGER THIS EVENING AND THE AREA IS MORE EXPOSED...HAVE KEPT A
WINTER WEATHER ADVISORY FOR BLOWING SNOW GOING THERE. AFTER
MIDNIGHT...WIND CHILL CRITERIA LOOKS TO BE MET ACROSS THE FORECAST
AREA...AND THEREFORE WIND CHILL ADVISORIES WERE PUT UP. NOTE THAT
THE WIND CHILL ADVISORY HAS BEEN COMBINED WITH THE WINTER WEATHER
ADVISORY OVER SOUTHEAST MINNESOTA AND NORTHEAST IOWA FOR SIMPLICITY.

THURSDAY...SHORTWAVE CURRENTLY OVER CENTRAL MONTANA IS PROGGED TO
MARCH EASTWARD ACROSS THE DAKOTAS...MINNESOTA AND INTO NORTHERN
WISCONSIN BY LATE IN THE DAY. ASSOCIATED WITH THIS SHORTWAVE IS A
ZONE OF ISENTROPIC LIFT...SEEN ON THE 265K SURFACE. THE RESULT OF
THIS LIFT IS A FORMATION OF A STRATUS DECK...NOTED ON 850MB RH
FIELDS FROM THE GFS/NAM...AND IS PRESENTLY BEING OBSERVED IN CENTRAL
AND EASTERN MONTANA. HAVE INCREASED CLOUD COVER TO ACCOUNT FOR THE
LIFT...ESPECIALLY IN THE AFTERNOON...AND FURTHER INCREASES MAY BE
NECESSARY. THIS CLOUD COVER...COMBINED WITH THE COLD AIRMASS MOVING
IN TONIGHT...WILL NOT HELP AT ALL IN ALLOWING TEMPERATURES TO RISE.
THEREFORE...HAVE KEPT HIGHS WELL BELOW NORMAL...AT MOST TOPPING OUT
AROUND 10 ABOVE. GIVEN THE SLOW TEMPERATURE RISE...KEPT THE WIND
CHILL ADVISORY GOING UNTIL 17Z.

THURSDAY NIGHT INTO FRIDAY...UPPER LEVEL FLOW IS INDICATED TO START
TURNING A LITTLE MORE WESTERLY IN THE WAKE OF THURSDAYS SHORTWAVE.
SOME OF THIS IS DUE TO THE POLAR VORTEX IN THE NUNAVUT REGION
DIGGING DOWN INTO ALBERTA AND SASKATCHEWAN. THIS SWITCH TO A
WESTERLY FLOW ALOFT SHOULD TURN THE LOW LEVEL FLOW INTO A RETURN
WEST-SOUTHWEST FLOW. LOOKING AGAIN AT THE 265K SURFACE FROM THE
09.12Z GFS/NAM...ISENTROPIC LIFT IS STILL PROGGED ACROSS MUCH OF THE
AREA THROUGH FRIDAY MORNING...WITH THE GREATEST AMOUNT OVER TAYLOR
AND CLARK COUNTIES. AFTER COORDINATION WITH SURROUNDING OFFICES...
DECIDED TO NOT ONLY INCREASE CLOUD COVER...BUT INCLUDE THE MENTION
OF SOME FLURRIES OVER TAYLOR AND CLARK COUNTIES AS WELL. TEMPERATURE
FORECASTS ARE A LITTLE TRICKY...GIVEN THE CLOUD COVER AND RETURN
FLOW. HOWEVER...GIVEN HOW COLD WE ARE ON THURSDAY...IT SEEMS
REASONABLE FOR TEMPERATURES TO FALL BACK INTO THE SINGLE DIGITS
BELOW ZERO THURSDAY NIGHT. A LITTLE WARMER CONDITIONS SHOULD BE FELT
ON FRIDAY AS WINDS BRING UP SOME WARMER AIR FROM THE SOUTHWEST.
HOWEVER...WITH SUNSHINE STILL BEING LIMITED AND THE EXTENSIVE
SNOWPACK...KEPT HIGHS STILL 10 TO 15 DEGREES BELOW NORMAL.

FRIDAY NIGHT INTO SATURDAY...UPPER LEVEL FLOW IS PROGGED TO REMAIN
WESTERLY DURING THIS TIME FRAME...AS THE POLAR VORTEX DROPS FURTHER
SOUTH THROUGH ALBERTA. NOT REALLY ANY FORCING MECHANISMS INDICATED
WITHIN THE UPPER FLOW...THEREFORE A DRY FORECAST LOOKS GOOD. SHOULD
BE A WARMER PERIOD AS WELL...WITH 850MB TEMPS CLIMBING TO -4 TO -6C
ON SATURDAY...COMPARED TO THE -20C READINGS EXPECTED ON THURSDAY.
THEREFORE HAVE RAISED BOTH LOWS AND HIGHS...THOUGH FRIDAY NIGHT IS A
LITTLE TRICKY AS THE WINDS MAY BRIEFLY DECOUPLE IN THE EVENING.

.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY

MODELS AND ENSEMBLES ARE IN SURPRISINGLY GOOD AGREEMENT THROUGH THE
LONG TERM PORTION OF THE FORECAST...BOTH IN THE MID LEVEL AND
SURFACE FLOW. ONE MINOR DIFFERENCE EXISTS SUNDAY NIGHT INTO
MONDAY...OTHERWISE ABOVE AVERAGE CONFIDENCE EXISTS IN THE FORECAST.
IN THE MEAN PATTERN...ZONAL FLOW IS PROGGED ACROSS THE COUNTRY
SATURDAY NIGHT...THEN TROUGHING IS GOING TO GRADUALLY DEVELOP ACROSS
THE PLAINS BY MONDAY. THE DEEPER PORTION OF THE TROUGH LOOKS TO
PROGRESS EASTWARD QUICKLY ACROSS THE AREA AS RIDGING BUILDS INTO THE
WESTERN U.S....THOUGH A WEST-NORTHWEST FLOW ALOFT LOOKS TO REMAIN IN
PLACE THROUGH WEDNESDAY.

IN TERMS OF THE DETAILS...A SHORTWAVE OVER SOUTHERN CALIFORNIA
SATURDAY NIGHT IS PROGGED TO LIFT NORTHEAST AS TROUGHING DEVELOPS
OVER WESTERN CANADA AND THE NORTHERN ROCKIES. MODELS HAVING VARYING
TIMING DIFFERENCES WITH THIS SHORTWAVE...BUT IT SEEMS THAT SOMEWHERE
BETWEEN SUNDAY NIGHT AND MONDAY THE SHORTWAVE WOULD CROSS IOWA. WARM
ADVECTION AHEAD OF THE SHORTWAVE COULD SPREAD SOME LIGHT SNOW INTO
THE AREA ON SUNDAY...WARRANTING THE LOW CHANCES OF PRECIPITATION IN
THE FORECAST. BETTER CHANCES FOR PRECIPITATION SHOULD COME SUNDAY
NIGHT AND MONDAY AS THE SHORTWAVE CROSSES JUST TO THE SOUTH. IN THE
WAKE OF THE SHORTWAVE...CANADIAN HIGH PRESSURE IS PROGGED TO DROP
SOUTH INTO THE PLAINS ON TUESDAY...CROSSING THE AREA TUESDAY NIGHT.
WITH THIS HIGH COMING IN...ANTICIPATE DRYING AND COOLING CONDITIONS.
RETURN FLOW LOOKS TO SET UP ON WEDNESDAY...AND ALTHOUGH THERE COULD
BE A SHORTWAVE MOVING THROUGH THE FLOW TO WARRANT SOME PRECIPITATION
CHANCES...PROBABILITY RIGHT NOW LOOKS TO INCLUDE THEM. OVERALL...
TEMPERATURES ARE EXPECTED TO REMAIN AT OR BELOW NORMAL THROUGH THE
PERIOD.

&&

.AVIATION...TONIGHT AND THURSDAY

LATEST 18Z SURFACE ANALYSIS INDICATED A STRONG LOW PRESSURE SYSTEM
OVER NORTHERN LOWER MICHIGAN. A TIGHT PRESSURE GRADIENT ON THE
BACKSIDE OF THE LOW PRESSURE SYSTEM HAS ALLOWED FOR STRONG WINDS AT
BOTH KRST AND KLSE TAF SITES. BLOWING AND DRIFTING SNOW IS REDUCING
VISIBILITIES TO A MILE OR LESS ACROSS PORTIONS OF SOUTHEAST
MINNESOTA AND NORTHEAST IOWA. THE LOW PRESSURE SYSTEM WILL MOVE
NORTHEAST INTO SOUTHERN CANADA THIS EVENING. WINDS WILL CONTINUE TO
BE 20 TO 35 MPH WITH GUSTS UP TO 45 MPH THROUGH 00Z THURSDAY.
VISIBILITIES WILL THEN BEGIN TO IMPROVE TO MVFR RANGE AT KRST BY 00Z
THURSDAY AND MVFR CONDITIONS WILL PREVAIL THROUGH 08Z THURSDAY.
THEN...VFR CONDITIONS ARE EXPECTED AFTER 13Z AT BOTH KRST AND KLSE
TAF SITES...AS A WEAK SURFACE RIDGE BUILDS INTO EASTERN MINNESOTA.

&&

.ARX WATCHES/WARNINGS/ADVISORIES...
WI...WIND CHILL ADVISORY FROM MIDNIGHT TONIGHT TO 11 AM CST THURSDAY
     FOR WIZ017-WIZ029-WIZ032-WIZ033-WIZ034-WIZ041-WIZ042-WIZ043-
     WIZ044-WIZ053-WIZ054-WIZ055-WIZ061.

MN...WINTER WEATHER ADVISORY UNTIL 11 AM CST THURSDAY FOR MNZ079-
     MNZ086-MNZ087-MNZ088-MNZ094-MNZ095-MNZ096.

IA...WINTER WEATHER ADVISORY UNTIL 11 AM CST THURSDAY FOR IAZ008-
     IAZ009-IAZ010-IAZ011-IAZ018-IAZ019-IAZ029-IAZ030.

&&

SHORT/LONG TERM...AJ
AVIATION..........DTJ

Hazardous weather outlook, Dec 9, 11:56 PM CST, 4 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LA CROSSE WI
1156 PM CST WED DEC 9 2009

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-032>034-
041>044-053>055-061-101200-
ADAMS-ALLAMAKEE-BUFFALO-CHICKASAW-CLARK-CLAYTON-CRAWFORD-DODGE-
FAYETTE-FILLMORE-FLOYD-GRANT-HOUSTON-HOWARD-JACKSON-JUNEAU-LA CROSSE-
MITCHELL-MONROE-MOWER-OLMSTED-RICHLAND-TAYLOR-TREMPEALEAU-VERNON-
WABASHA-WINNESHIEK-WINONA-
1156 PM CST WED DEC 9 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PARTS OF SOUTHEAST
MINNESOTA...NORTHEAST IOWA...AND SOUTHWEST INTO CENTRAL WISCONSIN.

.DAY ONE...TONIGHT

TEMPERATURES WILL FALL INTO THE SINGLE DIGITS BELOW ZERO
TONIGHT. NORTHWEST WINDS WILL COMBINE WITH THESE COLD TEMPERATURES
TO PRODUCE WIND CHILL VALUES IN THE 15 TO 25 BELOW
ZERO RANGE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

WIND CHILLS OF 15 TO 25 BELOW WILL BE COMMON THURSDAY MORNING AND
AGAIN LATE THURSDAY NIGHT INTO FRIDAY MORNING.

.SPOTTER INFORMATION STATEMENT...

ANY ADDITIONAL SNOWFALL THAT FELL THROUGH WEDNESDAY WOULD BE
APPRECIATED THURSDAY MORNING.

.EMERGENCY MANAGEMENT COORDINATION...

NO CALL IS SCHEDULED.

DTJ/AJ/DAS

In the hours before

Local storm report, Dec 9, 9:43 PM CST, 2 hours 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
943 PM CST WED DEC 09 2009

...TIME...  ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
...DATE...  ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0108 PM     SNOW             COLBY 4SW               44.87N 90.42W
12/09/2009  E6.0 INCH        CLARK              WI   PUBLIC

0120 PM     SNOW             MCGREGOR 4W             43.01N 91.28W
12/09/2009  E10.0 INCH       CLAYTON            IA   PUBLIC

0122 PM     SNOW             CLAYTON CENTER          42.88N 91.32W
12/09/2009  E10.0 INCH       CLAYTON            IA   PUBLIC

0123 PM     SNOW             HAWKEYE 2N              42.99N 91.97W
12/09/2009  E10.0 INCH       FAYETTE            IA   PUBLIC

0124 PM     SNOW             STACYVILLE              43.44N 92.79W
12/09/2009  E6.0 INCH        MITCHELL           IA   PUBLIC

0127 PM     SNOW             RUSHFORD                43.81N 91.75W
12/09/2009  E16.5 INCH       FILLMORE           MN   PUBLIC

0128 PM     SNOW             WYKOFF 3N               43.76N 92.27W
12/09/2009  E12.4 INCH       FILLMORE           MN   PUBLIC

0129 PM     SNOW             HIGHLAND                43.69N 91.89W
12/09/2009  E12.0 INCH       FILLMORE           MN   PUBLIC

0133 PM     SNOW             ROCHESTER 4E            43.90N 92.38W
12/09/2009  E10.0 INCH       OLMSTED            MN   PUBLIC

0140 PM     SNOW             ORONOCO                 44.16N 92.54W
12/09/2009  E12.9 INCH       OLMSTED            MN   PUBLIC

0142 PM     SNOW             ROCHESTER AIRPORT       43.94N 92.50W
12/09/2009  E12.8 INCH       OLMSTED            MN   PUBLIC

0143 PM     SNOW             GILMAN                  45.17N 90.81W
12/09/2009  E10.0 INCH       TAYLOR             WI   PUBLIC

0147 PM     SNOW             LA CROSSE NWS           43.28N 91.19W
12/09/2009  E12.9 INCH       LA CROSSE          WI   PUBLIC

0148 PM     SNOW             SHELBY                  43.76N 91.16W
12/09/2009  E13.0 INCH       LA CROSSE          WI   PUBLIC

0151 PM     SNOW             BLACK RIVER FALLS       44.30N 90.85W
12/09/2009  E12.0 INCH       JACKSON            WI   PUBLIC

0153 PM     SNOW             MILLSTON                44.20N 90.65W
12/09/2009  E12.0 INCH       JACKSON            WI   PUBLIC

0155 PM     SNOW             LOYAL 6SE               44.71N 90.42W
12/09/2009  E7.0 INCH        CLARK              WI   PUBLIC

0159 PM     SNOW             NECEDAH 3SE             43.98N 90.04W
12/09/2009  E9.0 INCH        JUNEAU             WI   PUBLIC

0202 PM     SNOW             OSSEO                   44.58N 91.21W
12/09/2009  E12.5 INCH       TREMPEALEAU        WI   PUBLIC

0247 PM     SNOW             LA CROSSE 2S            43.81N 91.23W
12/09/2009  E16.8 INCH       LA CROSSE          WI   PUBLIC

0250 PM     SNOW             MAUSTON WRJC RADIO      43.82N 90.07W
12/09/2009  E12.5 INCH       JUNEAU             WI   PUBLIC

0449 AM     SNOW             WINONA 3S               43.99N 91.61W
12/09/2009  E15.0 INCH       WINONA             MN   PUBLIC

0450 AM     SNOW             MEDFORD 4NW             45.16N 90.38W
12/09/2009  E10.3 INCH       TAYLOR             WI   PUBLIC

0451 AM     SNOW             LA CROSSE 5SSE          43.79N 91.21W
12/09/2009  E10.8 INCH       LA CROSSE          WI   PUBLIC

0452 AM     SNOW             GRAND MEADOW            43.71N 92.57W
12/09/2009  E10.0 INCH       MOWER              MN   PUBLIC

0532 PM     SNOW             HAMMOND 1S              44.21N 92.37W
12/09/2009  E12.0 INCH       WABASHA            MN   PUBLIC

0532 PM     SNOW             MONONA 1S               43.04N 91.39W
12/09/2009  E13.0 INCH       CLAYTON            IA   PUBLIC

0537 PM     SNOW             MONDOVI                 44.57N 91.67W
12/09/2009  E10.0 INCH       BUFFALO            WI   PUBLIC

0538 PM     SNOW             HOLMEN 2S               43.95N 91.26W
12/09/2009  E14.6 INCH       LA CROSSE          WI   PUBLIC

0538 PM     SNOW             MUSCODA 6S              43.13N 90.44W
12/09/2009  E11.5 INCH       GRANT              WI   PUBLIC

0540 PM     SNOW             DECORAH                 43.31N 91.79W
12/09/2009  E12.0 INCH       WINNESHIEK         IA   PUBLIC

0630 AM     SNOW             WAUKON 8NW              43.34N 91.60W
12/09/2009  E10.0 INCH       ALLAMAKEE          IA   PUBLIC

0648 AM     SNOW             GOODVIEW                44.07N 91.71W
12/09/2009  E13.8 INCH       WINONA             MN   PUBLIC

0649 AM     SNOW             WILTON 4E               43.82N 90.48W
12/09/2009  E10.0 INCH       MONROE             WI   PUBLIC

0706 AM     SNOW             PETERSON 1S             43.78N 91.82W
12/09/2009  E14.0 INCH       FILLMORE           MN   PUBLIC

0727 AM     SNOW             ARKDALE                 44.03N 89.89W
12/09/2009  E7.5 INCH        ADAMS              WI   PUBLIC

0727 AM     SNOW             READS LANDING 1W        44.40N 92.17W
12/09/2009  E12.0 INCH       WABASHA            MN   PUBLIC

0730 AM     SNOW             ROCHESTER               44.02N 92.47W
12/09/2009  E10.8 INCH       OLMSTED            MN   PUBLIC

0734 AM     SNOW             LONGWOOD                44.89N 90.60W
12/09/2009  E5.0 INCH        CLARK              WI   PUBLIC

0734 AM     SNOW             ZUMBRO FALLS            44.29N 92.43W
12/09/2009  E10.0 INCH       WABASHA            MN   PUBLIC

0735 AM     SNOW             DECORAH 5E              43.30N 91.70W
12/09/2009  E12.0 INCH       WINNESHIEK         IA   PUBLIC

0736 AM     SNOW             FOUR CORNERS            44.08N 90.91W
12/09/2009  E10.5 INCH       MONROE             WI   PUBLIC

0737 AM     SNOW             OELWEIN                 42.67N 91.92W
12/09/2009  E14.0 INCH       FAYETTE            IA   PUBLIC

0738 AM     SNOW             HOLMEN 2NW              43.98N 91.29W
12/09/2009  E15.2 INCH       LA CROSSE          WI   PUBLIC

0741 AM     SNOW             CHARLES CITY            43.06N 92.69W
12/09/2009  E6.0 INCH        FLOYD              IA   PUBLIC

0741 AM     SNOW             EDGEWOOD                42.64N 91.40W
12/09/2009  E11.5 INCH       CLAYTON            IA   PUBLIC

0741 AM     SNOW             VOLGA 1NE               42.81N 91.54W
12/09/2009  E11.0 INCH       CLAYTON            IA   PUBLIC

0742 AM     SNOW             OTRANTO                 43.49N 93.01W
12/09/2009  E10.0 INCH       MITCHELL           IA   PUBLIC

0743 AM     SNOW             RENO                    43.60N 91.28W
12/09/2009  E9.5 INCH        HOUSTON            MN   PUBLIC

0744 AM     SNOW             ELGIN 2SSW              44.11N 92.26W
12/09/2009  E8.0 INCH        WABASHA            MN   PUBLIC

0746 AM     SNOW             NEILLSVILLE 3SW         44.54N 90.62W
12/09/2009  E9.0 INCH        CLARK              WI   PUBLIC

0749 AM     SNOW             DECORAH 8ENE            43.33N 91.70W
12/09/2009  E13.0 INCH       WINNESHIEK         IA   PUBLIC

0752 AM     SNOW             WABASHA                 44.37N 92.04W
12/09/2009  E11.0 INCH       WABASHA            MN   PUBLIC

0752 AM     SNOW             WINONA 2ENE             44.06N 91.63W
12/09/2009  E11.0 INCH       WINONA             MN   PUBLIC

0753 AM     SNOW             WAUCOMA 3SE             43.02N 91.98W
12/09/2009  E10.5 INCH       FAYETTE            IA   PUBLIC

0755 AM     SNOW             CALMAR                  43.18N 91.87W
12/09/2009  E13.4 INCH       WINNESHIEK         IA   PUBLIC

0755 AM     SNOW             TUNNEL CITY             44.00N 90.57W
12/09/2009  E8.3 INCH        MONROE             WI   PUBLIC

0756 AM     SNOW             ELKADER                 42.85N 91.41W
12/09/2009  E8.6 INCH        CLAYTON            IA   PUBLIC

0756 AM     SNOW             PRAIRIE DU CHIEN        43.03N 91.14W
12/09/2009  E10.5 INCH       CRAWFORD           WI   PUBLIC

0757 AM     SNOW             TAYLOR                  44.32N 91.12W
12/09/2009  E14.0 INCH       JACKSON            WI   PUBLIC

0758 AM     SNOW             BYRON                   44.03N 92.65W
12/09/2009  E10.5 INCH       OLMSTED            MN   PUBLIC

0758 AM     SNOW             NECEDAH                 44.03N 90.07W
12/09/2009  E8.9 INCH        JUNEAU             WI   PUBLIC

0802 AM     SNOW             STEUBEN 3NW             43.20N 90.88W
12/09/2009  E12.4 INCH       CRAWFORD           WI   PUBLIC

0806 AM     SNOW             WESTBY 3ENE             43.66N 90.82W
12/09/2009  E10.1 INCH       VERNON             WI   PUBLIC

0807 AM     SNOW             ST ANSGAR               43.38N 92.92W
12/09/2009  E9.3 INCH        MITCHELL           IA   PUBLIC

0807 AM     SNOW             VIROQUA                 43.55N 90.89W
12/09/2009  E9.8 INCH        VERNON             WI   PUBLIC

0808 AM     SNOW             LA FARGE                43.58N 90.64W
12/09/2009  E9.6 INCH        VERNON             WI   PUBLIC

0811 AM     SNOW             IONIA 2W                43.04N 92.48W
12/09/2009  E7.5 INCH        CHICKASAW          IA   PUBLIC

0812 AM     SNOW             SOLDIERS GROVE          43.39N 90.77W
12/09/2009  E9.0 INCH        CRAWFORD           WI   PUBLIC

0815 AM     SNOW             STRAWBERRY POINT        42.68N 91.54W
12/09/2009  E14.0 INCH       CLAYTON            IA   PUBLIC

0816 AM     SNOW             DAKOTA                  43.91N 91.36W
12/09/2009  E16.3 INCH       WINONA             MN   PUBLIC

0817 AM     SNOW             VIOLA                   43.51N 90.67W
12/09/2009  E14.0 INCH       VERNON             WI   PUBLIC

0822 AM     SNOW             READSTOWN               43.45N 90.76W
12/09/2009  E11.0 INCH       VERNON             WI   PUBLIC

0823 AM     SNOW             GALESVILLE              44.08N 91.36W
12/09/2009  E14.0 INCH       TREMPEALEAU        WI   PUBLIC

0824 AM     SNOW             BLAIR 2NW               44.31N 91.25W
12/09/2009  E10.5 INCH       TREMPEALEAU        WI   PUBLIC

0825 AM     SNOW             AUSTIN                  43.67N 92.98W
12/09/2009  E7.0 INCH        MOWER              MN   PUBLIC

0826 AM     SNOW             SPRING GROVE            43.56N 91.64W
12/09/2009  E7.0 INCH        HOUSTON            MN   PUBLIC

0827 AM     SNOW             CRESCO                  43.38N 92.12W
12/09/2009  E10.0 INCH       HOWARD             IA   PUBLIC

0828 AM     SNOW             LANSING 4SE             43.32N 91.16W
12/09/2009  E10.9 INCH       ALLAMAKEE          IA   PUBLIC

0828 AM     SNOW             WARRENS 5WSW            44.11N 90.59W
12/09/2009  E14.1 INCH       MONROE             WI   PUBLIC

0829 AM     SNOW             FAYETTE                 42.84N 91.80W
12/09/2009  E11.5 INCH       FAYETTE            IA   PUBLIC

0831 AM     SNOW             MAUSTON                 43.80N 90.08W
12/09/2009  E11.1 INCH       JUNEAU             WI   PUBLIC

0831 AM     SNOW             ST CHARLES 5N           44.04N 92.07W
12/09/2009  E13.0 INCH       WINONA             MN   PUBLIC

0832 AM     SNOW             NEW HAMPTON             43.06N 92.31W
12/09/2009  E12.5 INCH       CHICKASAW          IA   PUBLIC

0833 AM     SNOW             THEILMAN                44.30N 92.20W
12/09/2009  E9.7 INCH        WABASHA            MN   PUBLIC

0836 AM     SNOW             WESTBORO                45.35N 90.30W
12/09/2009  E7.0 INCH        TAYLOR             WI   PUBLIC

0837 AM     SNOW             ONTARIO                 43.72N 90.59W
12/09/2009  E7.6 INCH        VERNON             WI   PUBLIC

0838 AM     SNOW             PRESTON                 43.67N 92.08W
12/09/2009  E14.0 INCH       FILLMORE           MN   PUBLIC

0841 AM     SNOW             ELKADER 6SSW            42.81N 91.43W
12/09/2009  E8.6 INCH        CLAYTON            IA   PUBLIC

0845 AM     SNOW             OSSEO                   44.58N 91.22W
12/09/2009  E14.0 INCH       TREMPEALEAU        WI   PUBLIC

0846 AM     SNOW             MEDFORD                 45.14N 90.35W
12/09/2009  E12.0 INCH       TAYLOR             WI   PUBLIC

0859 AM     SNOW             WATERVILLE 8S           43.11N 91.29W
12/09/2009  E12.8 INCH       ALLAMAKEE          IA   PUBLIC

0859 AM     SNOW             WINONA                  44.05N 91.66W
12/09/2009  E15.6 INCH       WINONA             MN   PUBLIC

0901 AM     SNOW             ELMA                    43.25N 92.44W
12/09/2009  E7.8 INCH        HOWARD             IA   PUBLIC

0901 AM     SNOW             WILLARD                 44.73N 90.74W
12/09/2009  E9.0 INCH        CLARK              WI   PUBLIC

0907 AM     SNOW             CUBA CITY               42.60N 90.43W
12/09/2009  E9.8 INCH        GRANT              WI   PUBLIC

0908 AM     SNOW             SINSINAWA               42.52N 90.53W
12/09/2009  E7.0 INCH        GRANT              WI   PUBLIC

0912 AM     SNOW             OSAGE                   43.29N 92.81W
12/09/2009  E10.0 INCH       MITCHELL           IA   PUBLIC

0929 AM     SNOW             LA CRESCENT 1N          43.83N 91.31W
12/09/2009  E13.0 INCH       HOUSTON            MN   PUBLIC

0935 PM     SNOW             STODDARD 5NNE           43.72N 91.17W
12/09/2009  E13.5 INCH       VERNON             WI   PUBLIC

0936 PM     SNOW             VALLEY 1NW              43.65N 90.55W
12/09/2009  E9.0 INCH        VERNON             WI   PUBLIC

0940 AM     SNOW             AUSTIN KAAL TV          43.68N 92.95W
12/09/2009  E11.0 INCH       MOWER              MN   PUBLIC

0941 AM     SNOW             SPRING VALLEY 3E        43.68N 92.31W
12/09/2009  E8.0 INCH        FILLMORE           MN   PUBLIC

0942 AM     SNOW             WHITEHALL               44.37N 91.32W
12/09/2009  E8.0 INCH        TREMPEALEAU        WI   PUBLIC

0943 AM     SNOW             BLACK RIVER FALLS       44.30N 90.86W
12/09/2009  E11.7 INCH       JACKSON            WI   PUBLIC

0943 AM     SNOW             SPARTA                  43.95N 90.81W
12/09/2009  E7.0 INCH        MONROE             WI   PUBLIC

0950 AM     SNOW             WAUKON 6ESE             43.24N 91.59W
12/09/2009  E12.5 INCH       ALLAMAKEE          IA   PUBLIC

0951 AM     SNOW             NEW HAMPTON 1S          43.04N 92.32W
12/09/2009  E13.0 INCH       CHICKASAW          IA   PUBLIC

0953 AM     SNOW             MILLVILLE               42.71N 91.08W
12/09/2009  E13.5 INCH       CLAYTON            IA   PUBLIC

0954 AM     SNOW             N. WASHINGTON           43.12N 92.42W
12/09/2009  E12.0 INCH       CHICKASAW          IA   PUBLIC

0957 AM     SNOW             LAKE CAMELOT            44.21N 89.77W
12/09/2009  E11.0 INCH       ADAMS              WI   PUBLIC

0957 AM     SNOW             NASHUA                  42.95N 92.54W
12/09/2009  E6.0 INCH        CHICKASAW          IA   PUBLIC

0959 AM     SNOW             HOKAH                   43.76N 91.35W
12/09/2009  E13.0 INCH       HOUSTON            MN   PUBLIC

1000 AM     SNOW             FRIENDSHIP              43.97N 89.82W
12/09/2009  E8.6 INCH        ADAMS              WI   PUBLIC

1000 AM     SNOW             GILMANTON 8SE           44.39N 91.60W
12/09/2009  E14.0 INCH       BUFFALO            WI   PUBLIC

1001 AM     SNOW             COCHRANE                44.22N 91.82W
12/09/2009  E14.0 INCH       BUFFALO            WI   PUBLIC

1004 AM     SNOW             ROCK DAM LAKE           44.73N 90.84W
12/09/2009  E10.0 INCH       CLARK              WI   PUBLIC

1006 AM     SNOW             WITHEE                  44.96N 90.60W
12/09/2009  E11.0 INCH       CLARK              WI   PUBLIC

1010 AM     SNOW             MOUNT ZION 2NW          43.29N 90.87W
12/09/2009  E7.0 INCH        CRAWFORD           WI   PUBLIC

1011 AM     SNOW             MERRILLAN               44.45N 90.84W
12/09/2009  E10.0 INCH       JACKSON            WI   PUBLIC

1011 AM     SNOW             STEUBEN 2SW             43.15N 90.89W
12/09/2009  E14.0 INCH       CRAWFORD           WI   PUBLIC

1016 AM     SNOW             BLUE RIVER              43.19N 90.57W
12/09/2009  E12.0 INCH       GRANT              WI   PUBLIC

1017 AM     SNOW             WARRENS                 44.13N 90.50W
12/09/2009  E11.0 INCH       MONROE             WI   PUBLIC

1020 AM     SNOW             ABBOTSFORD              44.94N 90.33W
12/09/2009  E9.5 INCH        CLARK              WI   PUBLIC

1020 AM     SNOW             LANCASTER               42.85N 90.71W
12/09/2009  E9.0 INCH        GRANT              WI   PUBLIC

1020 AM     SNOW             TOMAH                   43.98N 90.49W
12/09/2009  E10.0 INCH       MONROE             WI   PUBLIC

1022 AM     SNOW             GILLINGHAM              43.43N 90.45W
12/09/2009  E7.0 INCH        RICHLAND           WI   PUBLIC

1028 AM     SNOW             LAKE CITY               44.45N 92.28W
12/09/2009  E8.0 INCH        WABASHA            MN   PUBLIC

1030 AM     SNOW             STODDARD 2NE            43.69N 91.18W
12/09/2009  E13.3 INCH       VERNON             WI   PUBLIC

1030 AM     SNOW             WESTBORO 4E             45.35N 90.26W
12/09/2009  E10.0 INCH       TAYLOR             WI   PUBLIC

1033 AM     SNOW             CENTERVILLE 1N          44.08N 91.46W
12/09/2009  E13.0 INCH       TREMPEALEAU        WI   PUBLIC

1038 AM     SNOW             NEILLSVILLE 6N          44.63N 90.60W
12/09/2009  E9.0 INCH        CLARK              WI   PUBLIC

1039 AM     SNOW             DODGE CENTER            44.03N 92.86W
12/09/2009  E13.0 INCH       DODGE              MN   PUBLIC

1040 AM     SNOW             MANTORVILLE             44.07N 92.76W
12/09/2009  E10.0 INCH       DODGE              MN   PUBLIC

1043 AM     SNOW             HOUSTON 5E              43.76N 91.49W
12/09/2009  E13.0 INCH       HOUSTON            MN   PUBLIC

1045 AM     SNOW             ORONOCO 2E              44.16N 92.51W
12/09/2009  E13.1 INCH       OLMSTED            MN   PUBLIC

1046 AM     SNOW             MINNESOTA CITY          44.09N 91.75W
12/09/2009  E16.3 INCH       WINONA             MN   PUBLIC

1054 AM     SNOW             DOUGLAS 2N              44.16N 92.57W
12/09/2009  E12.0 INCH       OLMSTED            MN   PUBLIC

1058 AM     SNOW             HOLMEN                  43.96N 91.26W
12/09/2009  E15.5 INCH       LA CROSSE          WI   PUBLIC

1059 AM     SNOW             RENO 3SW                43.53N 91.33W
12/09/2009  E12.0 INCH       HOUSTON            MN   PUBLIC

1105 AM     SNOW             CALEDONIA 6S            43.54N 91.50W
12/09/2009  E14.0 INCH       HOUSTON            MN   PUBLIC

1105 AM     SNOW             COON VALLEY             43.70N 91.01W
12/09/2009  E12.8 INCH       VERNON             WI   PUBLIC

1111 AM     SNOW             WABASHA 5S              44.32N 92.05W
12/09/2009  E11.0 INCH       WABASHA            MN   PUBLIC

1128 AM     SNOW             ROCHESTER               44.02N 92.48W
12/09/2009  E11.8 INCH       OLMSTED            MN   PUBLIC

1129 AM     SNOW             UNION                   42.83N 90.52W
12/09/2009  E14.5 INCH       GRANT              WI   PUBLIC

1130 AM     SNOW             ITHACA                  43.35N 90.28W
12/09/2009  E10.4 INCH       RICHLAND           WI   PUBLIC

1130 AM     SNOW             RICHLAND CENTER         43.34N 90.39W
12/09/2009  E11.0 INCH       RICHLAND           WI   PUBLIC

1133 AM     SNOW             WADENA                  42.84N 91.66W
12/09/2009  E10.5 INCH       FAYETTE            IA   PUBLIC

1136 AM     SNOW             STOCKTON                44.03N 91.77W
12/09/2009  E13.0 INCH       WINONA             MN   PUBLIC

1150 AM     SNOW             ROCHESTER KTTC TV       44.08N 92.51W
12/09/2009  E11.0 INCH       OLMSTED            MN   PUBLIC

1152 AM     SNOW             GOODRICH                45.16N 90.06W
12/09/2009  E6.0 INCH        TAYLOR             WI   PUBLIC

1200 PM     SNOW             LA CROSSE 3E            43.83N 91.20W
12/09/2009  E14.0 INCH       LA CROSSE          WI   PUBLIC

1203 PM     SNOW             FRENCH ISLAND           43.86N 91.26W
12/09/2009  E17.0 INCH       LA CROSSE          WI   PUBLIC

1210 PM     SNOW             OAK CENTER              44.35N 92.40W
12/09/2009  E12.0 INCH       WABASHA            MN   PUBLIC

1215 PM     SNOW             OSSIAN                  43.15N 91.77W
12/09/2009  E9.0 INCH        WINNESHIEK         IA   PUBLIC

1220 PM     SNOW             INDEPENDENCE 3NE        44.39N 91.39W
12/09/2009  E10.0 INCH       TREMPEALEAU        WI   PUBLIC

&&
OBSERVATIONS ARE COLLECTED FROM A VARIETY OF SOURCES WITH VARYING
EQUIPMENT AND EXPOSURE.  NOT ALL DATA LISTED IS CONSIDERED OFFICIAL.

ADAMS

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

7 cold/wind chill. Local standard time, as filed.

Cold/Wind Chill, Dodge

When: December 10, 12:00 AM CST to 11:00 AM CST
Where: Dodge forecast zone
Reported by: Mesonet
Coordinates: 44.023, -92.862 (the zone’s center; the record gives no point)

A wind chill value of -31 was recorded at West Concord.

Cold/Wind Chill, Fillmore

When: December 10, 12:00 AM CST to 11:00 AM CST
Where: Fillmore forecast zone
Reported by: Mesonet
Coordinates: 43.674, -92.090 (the zone’s center; the record gives no point)

Cold/Wind Chill, Houston

When: December 10, 12:00 AM CST to 11:00 AM CST
Where: Houston forecast zone
Reported by: Mesonet
Coordinates: 43.671, -91.493 (the zone’s center; the record gives no point)

Cold/Wind Chill, Mower

When: December 10, 12:00 AM CST to 11:00 AM CST
Where: Mower forecast zone
Reported by: Mesonet
Coordinates: 43.672, -92.752 (the zone’s center; the record gives no point)

Cold/Wind Chill, Olmsted

When: December 10, 12:00 AM CST to 11:00 AM CST
Where: Olmsted forecast zone
Reported by: Mesonet
Coordinates: 44.004, -92.402 (the zone’s center; the record gives no point)

Wind chill values had dropped to -30 in Rochester and in sections of eastern Olmsted County. Values of -28 were reached at the Rochester International Airport.

Cold/Wind Chill, Wabasha

When: December 10, 12:00 AM CST to 11:00 AM CST
Where: Wabasha forecast zone
Reported by: Mesonet
Coordinates: 44.284, -92.230 (the zone’s center; the record gives no point)

Cold/Wind Chill, Winona

When: December 10, 12:00 AM CST to 11:00 AM CST
Where: Winona forecast zone
Reported by: Mesonet
Coordinates: 43.987, -91.779 (the zone’s center; the record gives no point)

What these are

Cold/Wind Chill: Cold or wind chill below warning criteria that caused deaths, injuries or damage.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Minnesota in 2009 Every state in 2009 This day in weather history Warnings in Minnesota, December 2009

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 203609, 203610, 203611, 203612, 203613, 203614, 203615.