Alert archive / Wisconsin / Flash Flood Warnings in 2010

Flash Flood Warning 15, NWS Twin Cities, MN

August 11, 2010Chippewa County, Eau Claire County, Rusk County, Wisconsin

NWS Twin Cities, MN issued this flash flood warning at Aug 11, 2010, 12:23 AM CDT for Chippewa County, Eau Claire County, Rusk County, Wisconsin. It was in force for 5 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 11, 2010, 12:23 AM CDT (05:23 UTC)
Expired: Aug 11, 2010, 5:30 AM CDT
In force: 5 hr
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Flood severity: None

Counties Chippewa County, WI, Eau Claire County, WI, Rusk County, WI

The radar

The La Crosse radar (KARX), 149 km from the middle of the area, began a volume at 05:24 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Aug 11, 1:40 AM CDT	FLASH FLOOD	2 Nnw Cornell, WI	STREET FLOODING. STORM SEWERS OVERFLOWING.
Aug 11, 2:00 AM CDT	FLASH FLOOD	5 Se Eau Claire, WI	STREET FLOODING. HASTINGS WAY AND VALMONT AVENUE. 8-10 INCHES OF WATER.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this flash flood warning; the first came 77 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 5.4 hours before the alert went out and 198 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1596 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 830 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

731 
WGUS53 KMPX 110523
FFWMPX
WIC017-035-107-111030-
/O.NEW.KMPX.FF.W.0015.100811T0523Z-100811T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1223 AM CDT WED AUG 11 2010

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CHIPPEWA COUNTY IN WEST CENTRAL WISCONSIN...
  NORTHERN EAU CLAIRE COUNTY IN WEST CENTRAL WISCONSIN...
  SOUTHERN RUSK COUNTY IN NORTHWEST WISCONSIN...

* UNTIL 530 AM CDT

* AT 1220 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVING INTO THE WARNED AREA.
  RAINFALL AMOUNTS OF AROUND 4 INCHES IN ONE HOUR AND A HALF...HAVE 
  BEEN REPORTED FARTHER TO THE WEST IN PIERCE COUNTY.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CHIPPEWA FALLS...EAU CLAIRE...ALTOONA...BATEMAN...BLOOMER...BOYD...
  CADOTT...CONRATH...CORNELL...EAGLETON...FALL CREEK...HOLCOMBE...
  ISLAND LAKE...JIM FALLS...LAKE HALLIE...LAKE WISSOTA...LUDINGTON...
  NEW AUBURN...SHELDON AND STANLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...
COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND
OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.

&&

LAT...LON 4537 9072 4537 9091 4481 9091 4473 9093
      4473 9164 4520 9165 4521 9153 4542 9152
      4544 9070

$$

2 follow-up statements

819 
WGUS73 KMPX 110733
FFSMPX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
233 AM CDT WED AUG 11 2010

WIC017-035-107-111030-
/O.CON.KMPX.FF.W.0015.000000T0000Z-100811T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RUSK WI-CHIPPEWA WI-EAU CLAIRE WI-
233 AM CDT WED AUG 11 2010

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHERN RUSK COUNTY IN
NORTHWEST WISCONSIN...AND NORTHERN EAU CLAIRE AND CHIPPEWA COUNTIES
IN WEST CENTRAL WISCONSIN UNTIL 530 AM CDT...

AT 227 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
SCATTERED THUNDERSTORMS WITH VERY HEAVY RAINFALL CONTINUING ACROSS 
THE AREA...ALTHOUGH HEAVY RAINS WERE BEGINNING TO END OVER WESTERN 
CHIPPEWA AND EAU CLAIRE COUNTIES. 

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
CHIPPEWA FALLS...EAU CLAIRE...ALTOONA...BATEMAN...BLOOMER...BOYD...
CADOTT...CONRATH...CORNELL...EAGLETON...FALL CREEK...HOLCOMBE...
ISLAND LAKE...JIM FALLS...LAKE HALLIE...LAKE WISSOTA...LUDINGTON...
NEW AUBURN...SHELDON AND STANLEY.

AT 200 AM CDT...STREET FLOODING WAS REPORTED IN EAU CLAIRE. AT 140 
AM CDT...STREET FLOODING WAS REPORTED IN CORNELL WITH STORM SEWERS 
OVERFLOWING. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 4537 9072 4537 9091 4481 9091 4473 9093
      4473 9164 4520 9165 4521 9153 4542 9152
      4544 9070

$$

507 
WGUS73 KMPX 110943
FFSMPX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
443 AM CDT WED AUG 11 2010

WIC035-110954-
/O.CAN.KMPX.FF.W.0015.000000T0000Z-100811T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
EAU CLAIRE WI-
443 AM CDT WED AUG 11 2010

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHERN EAU CLAIRE
COUNTY IN WEST CENTRAL WISCONSIN IS CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. IF 
FLOODING HAS BEEN OBSERVED...PLEASE REPORT IT TO YOUR LOCAL LAW 
ENFORCEMENT AGENCY.

LAT...LON 4537 9072 4537 9091 4488 9094 4487 9163
      4520 9165 4521 9153 4542 9152 4544 9070

$$

WIC017-107-111030-
/O.CON.KMPX.FF.W.0015.000000T0000Z-100811T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RUSK WI-CHIPPEWA WI-
443 AM CDT WED AUG 11 2010

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR CHIPPEWA AND SOUTHERN
RUSK COUNTIES UNTIL 530 AM CDT...

AS OF 440 AM CDT...ALL OF THE HEAVY RAIN HAD ENDED OVER THE 
AREA...BUT LAW ENFORCEMENT REPORTED THAT SOME ROADS MAY STILL BE 
FLOODED IN SOUTHERN PARTS OF RUSK COUNTY. BASED ON THE HEAVY 
RAINFALL PATTERN...IT IS POSSIBLE THAT SOME FLOODING MAY STILL BE 
OCCURRING IN PARTS OF WESTERN CHIPPEWA COUNTY. 

RUNOFF FROM THIS EXCESSIVE RAINFALL COULD STILL CAUSE FLOODING 
TO OCCUR. SOME LOCATIONS THAT COULD EXPERIENCE FLOODING INCLUDE...
CHIPPEWA FALLS...BATEMAN...BLOOMER...BOYD...CADOTT...CONRATH...
CORNELL...EAGLETON...HOLCOMBE...ISLAND LAKE...JIM FALLS...LAKE WISSOTA...NEW 
AUBURN...SHELDON AND STANLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 4537 9072 4537 9091 4488 9094 4487 9163
      4520 9165 4521 9153 4542 9152 4544 9070

$$

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Twin Cities, MN wrote its last area forecast discussion before this flash flood warning went out at Aug 10, 10:33 PM CDT, 1 hour 50 minutes earlier.

Area forecast discussion, Aug 10, 10:33 PM CDT, 1 hour 50 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1033 PM CDT TUE AUG 10 2010

.UPDATED FOR THE 06Z AVIATION DISCUSSION BELOW...

.DISCUSSION...

SEVERAL FACTORS WILL LEAD TO VERY LOW CONFIDENCE IN THE SHORT TERM
AS MOISTURE CONVERGENCE/THETA-E ADVECTION AND CURRENT CONVECTION
ACROSS WESTERN MN WILL LEAD TO A DISRUPTION OF POPS/QPF OVERNIGHT.

CURRENT REGIONAL RADAR AND WV IMAGERY DOES SHOW THE APPARENT
UPPER LOW BEGINNING TO DEVELOP NEAR THE SD/ND/MN BORDER EARLY THIS
AFTN. THEREFORE...BEST OVERALL LIFT/MOISTURE ADVECTION WILL BE
ACROSS WC MN...AND INTO N MN FOR THE NEXT SEVERAL HRS...WITH
FLOODING BECOMING A MAJOR PROBLEM. CONVECTIVE LINE OF STORMS
ACROSS SW/WC MN CONTINUES TO BUILD TO THE N/NE...WHICH WILL LEAD
TO LIKELY POPS ACROSS SOUTHERN/EC/C MN...AS WELL AS WC WISCONSIN
LATER THIS AFTN/EVENING HRS. HOWEVER...MAIN SFC FRONT OR
CONVERGENCE LINE...WITH AMPLE MOISTURE IN THE BOUNDARY LAYER...MAY
ALLOW FOR MORE DEVELOPMENT ACROSS EASTERN SD/WESTERN MN LATER
THIS EVENING. HOWEVER...THIS IS WHERE CONFIDENCE REMAINS LOW AS
THE MAIN LIFT WILL BE ACROSS NORTHERN MN. THEREFORE...LATE
AFTN/EVENING FORECAST IS BASED ON CURRENT RADAR TRENDS IN THE NEXT
2-3 HRS...WITH ONLY CHC POPS OVERNIGHT IN FAR EASTERN MN/WESTERN
WISCONSIN...WITH NIL OR 10-15% IN THE FAR WEST. LATER SHIFTS WILL
NEED TO UPDATE IF CONVECTION DECIDES TO DEVELOP IN EASTERN SD THIS
EVENING.

AFTER TONIGHT...MAIN UPPER LOW WILL BE ACROSS NORTHERN MN/SOUTHERN
CANADIAN...WITH ONLY A WEAK CONVERGENCE LINE MOVING ACROSS THE
FA. ALTHOUGH THERE REMAINS SOME THREAT OF REDEVELOPMENT WEDNESDAY
AFTN...ESPECIALLY IN WESTERN WISCONSIN...AND CENTRAL MN...NOT TO
CONFIDENT TO CHG CURRENT FORECAST TRENDS. AFTER WEDNESDAY...MODELS
ARE SPEEDING UP THE NEXT SHORT WAVE AND ASSOCIATED LIFT/MOISTURE
TO AFFECT THE WESTERN FA BY LATE WEDNESDAY NIGHT/THURSDAY MORNING.
ALTHOUGH IT WILL RAIN BY LATE IN THE WEEK...TIMING OF THE ONSET OF
CONVECTION REMAINS A PROBLEM. HAVE UPDATED FOR A FASTER SCENARIO
FOR SHRA/TSRA IN THE W/SW FA...WITH A CONTINUE CHC THRU LATE
FRIDAY. THIS SHORT WAVE BY THE END OF THE WEEK IS FAIRLY
STRONG...WITH A STRONG PVA ANOMALY MOVING ACROSS THE DAKOTAS BY
LATE FRIDAY AFTN/EVENING. SVR WX IS A GOOD
POSSIBILITY...ESPECIALLY IF INSTABILITY AND UPPER DYNAMICS COME
TOGETHER DURING PRIME HEATING. SEE LATEST SPC PAGE FOR THE LATEST
INFORMATION.

AFT SATURDAY...AND INTO TUESDAY...A BROAD AREA OF LOW
PRESSURE/UPPER TROUGH/ THAT WILL BE CENTERED ACROSS HUDSON BAY BY
EARLY NEXT WEEK...WILL LEAD TO NW FLOW IN OUR REGION...AND A MUCH
COOLER/STABLE CANADIAN AIR MASS. ..JLT..

&&

.AVIATION... /06Z TAF ISSUANCE/

A BAND OF STRONGER THUNDERSTORMS WILL CONTINUE TO MOVE THROUGH PARTS
OF EAST CENTRAL...SOUTH CENTRAL MN INTO WEST CENTRAL WISCONSIN
OVERNIGHT. SFC BOUNDARY AND COOL FRONT SLOWLY MOVING INTO CENTRAL MN
OVERNIGHT. MARGINAL FLYING CONDS IN THE VICINITY OF THE
THUNDERSTORMS...MORE WIDESPREAD IFR/MARGINAL FLYING CONDITIONS IN
STRATUS/FOG LATER TONIGHT AND EARLY WEDNESDAY MORNING OVER WESTERN
AND CENTRAL MN...WITH SOME PATCHY FOG OVER WISCONSIN. CONDS
IMPROVING TO VFR BY AFTERNOON MOST LOCATIONS.  SFC WNDS SOUTHEAST 5
TO 10 KNOTS...THEN BECOMING WEST AFTER THE SFC FRONTAL BOUNDARY
PASSES.

.KMSP...SEE DISCUSSION ABOVE FOR THE REASON BEHIND THE FORECAST.
CEILINGS AND VISBILITIES LOWERING TO MARGINAL TO IFR FLYING
CONDITIONS IN STRATUS AND FOG AFTER SHRA/ISOLD TRSA DIMINISH OVER
THE AREA AFTER MIDNIGHT. LIGHT SOUTHEAST WINDS...BECOMING WEST
AROUND 10 KNOTS WEDNESDAY AFTERNOON.

&&

.MPX WATCHES/WARNINGS/ADVISORIES...
MN...NONE.
WI...NONE.
&&

JLT/JM

Hazardous weather outlook, Aug 10, 8:49 PM CDT, 3 hours 34 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
849 PM CDT TUE AUG 10 2010

MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028-
111700-
DOUGLAS-TODD-MORRISON-MILLE LACS-KANABEC-STEVENS-POPE-STEARNS-
BENTON-SHERBURNE-ISANTI-CHISAGO-LAC QUI PARLE-SWIFT-CHIPPEWA-
KANDIYOHI-MEEKER-WRIGHT-HENNEPIN-ANOKA-RAMSEY-WASHINGTON-
YELLOW MEDICINE-RENVILLE-MCLEOD-SIBLEY-CARVER-SCOTT-DAKOTA-
REDWOOD-BROWN-NICOLLET-LE SUEUR-RICE-GOODHUE-WATONWAN-BLUE EARTH-
WASECA-STEELE-MARTIN-FARIBAULT-FREEBORN-POLK-BARRON-RUSK-
ST. CROIX-PIERCE-DUNN-PEPIN-EAU CLAIRE-
849 PM CDT TUE AUG 10 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND
SOUTHERN MINNESOTA...AND WEST CENTRAL WISCONSIN.

.DAY ONE...TONIGHT
THUNDERSTORMS WILL CONTINUE OVER PORTIONS OF EAST CENTRAL AND SOUTH
CENTRAL MINNESOTA AND WEST CENTRAL WISCONSIN.  SOME OF THE STRONGER
STORMS COULD PRODUCE LOCALLY HEAVY RAINFALL...SMALL HAIL ALONG WITH
WIND GUSTS TO NEAR 40 MPH.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THUNDERSTORMS ARE POSSIBLE EAST OF I-35 ON WEDNESDAY. SEVERE
WEATHER IS NOT EXPECTED... BUT HEAVY RAIN WILL REMAIN A POTENTIAL
THREAT. THUNDERSTORMS ARE POSSIBLE ACROSS THE ENTIRE OUTLOOK AREA
THURSDAY NIGHT INTO SATURDAY... THEN AGAIN ON MONDAY. THERE IS A
SLIGHT RISK THAT THE STORMS THURSDAY NIGHT AND FRIDAY COULD BE
SEVERE... ALTHOUGH IT IS TOO SOON TO PINPOINT THE LOCATIONS AND
SPECIFIC TIME FRAME WHEN SEVERE WEATHER IS MOST LIKELY.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Local storm report, Aug 10, 11:55 PM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1155 PM CDT TUE AUG 10 2010

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

1022 PM     FLASH FLOOD      1 W LITTLE CANADA       45.02N 93.10W
08/10/2010                   RAMSEY             MN   TRAINED SPOTTER

            STANDING WATER IN INTERSECTION OF COUNTY ROAD C2 AND
            MARION STREET.

&&

AJZ

Local storm report, Aug 11, 12:10 AM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1210 AM CDT WED AUG 11 2010

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

1209 AM     HEAVY RAIN       TAINTER LAKE            44.99N 91.85W
08/11/2010  M3.05 INCH       DUNN               WI   TRAINED SPOTTER

            OCCURRED DURING THE PAST 2 HOURS.

&&

AJZ

Local storm report, Aug 11, 12:13 AM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1213 AM CDT WED AUG 11 2010

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

1209 AM     FLASH FLOOD      N PRESCOTT              44.75N 92.79W
08/11/2010                   PIERCE             WI   TRAINED SPOTTER

            STREET FLOODING FROM 4.73 INCHES OF RAIN IN 1.5 HOURS.
            GARBAGE BAGS FLOATING DOWN STREET.

&&

AJZ

Local storm report, Aug 11, 12:18 AM CDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1218 AM CDT WED AUG 11 2010

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

1217 AM     FLASH FLOOD      SPRING VALLEY           44.85N 92.24W
08/11/2010                   PIERCE             WI   LAW ENFORCEMENT

            SIX INCHES OF WATER ON ROADWAYS IN TOWN.

&&

AJZ

Local storm report, Aug 11, 12:20 AM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1220 AM CDT WED AUG 11 2010

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

1217 AM     FLASH FLOOD      RIVER FALLS             44.86N 92.62W
08/11/2010                   PIERCE             WI   LAW ENFORCEMENT

            CARS STALLED IN TOWN. WATER OVER THE ROAD ON 690TH STREET
            AND WEST COUNTY ROAD E.

&&

AJZ

Local storm report, Aug 11, 12:21 AM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1221 AM CDT WED AUG 11 2010

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

1217 AM     FLASH FLOOD      PRESCOTT                44.75N 92.79W
08/11/2010                   PIERCE             WI   LAW ENFORCEMENT

            CARS STALLED IN AND WEST OF TOWN.

&&

AJZ

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 8:00 PM CDT	Special Weather Statement	MPX	Barron	60 min
Aug 10, 8:41 PM CDT	Areal Flood Advisory	MPX	Barron, Dunn, Polk, Saint Croix	3 hr
Aug 10, 11:01 PM CDT	Flash Flood Warning	MPX	Barron, Dunn, Pierce, Polk, Saint Croix	3 hr
Aug 11, 1:05 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Eau Claire	40 min
Aug 11, 2:07 AM CDT	Special Weather Statement	MPX	Rusk	53 min
Aug 11, 2:21 AM CDT	Areal Flood Warning	MPX	Dunn, Pierce, Saint Croix	3 hr
Aug 11, 6:14 AM CDT	Areal Flood Warning	MPX	Chippewa, Dunn, Pierce, Saint Croix	6 hr

Nearby

Flash Flood Warnings in Wisconsin, 2010 Every flash flood warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.