Alert archive / Wisconsin / Flash Flood Warnings in 2009

Flash Flood Warning 9, NWS Twin Cities, MN

August 13, 2009Chippewa County, Eau Claire County, Wisconsin

NWS Twin Cities, MN issued this flash flood warning at Aug 13, 2009, 10:27 PM CDT for Chippewa County, Eau Claire County, Wisconsin. It was in force for 4 hr. 1 report 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 13, 2009, 10:27 PM CDT (03:27 UTC)
Expired
Aug 14, 2009, 2:30 AM CDT
In force
4 hr
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Flood severity
None

Counties Chippewa County, WI, Eau Claire County, WI

The radar

The La Crosse radar (KARX), 105 km from the middle of the area, began a volume at 03:28 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

TimeReportWhereRemark
Aug 14, 12:07 AM CDTFLASH FLOOD1 S Eau Claire, WILOWES CREEK ROAD WASHED OUT JUST OUTSIDE OF EAU CLAIRE.

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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.5 hours before the alert went out and 177 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2009-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 68 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2009-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
68 J/kg
Mixed-layer CIN
-235 J/kg
Mixed-layer LCL
1298 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
90 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KMPX 140327
FFWMPX
WIC017-035-140730-
/O.NEW.KMPX.FF.W.0009.090814T0327Z-090814T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1027 PM CDT THU AUG 13 2009

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 230 AM CDT

* AT 1020 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL SPREADING INTO
  THE WARNING AREA FROM SOUTHERN DUNN AND PEPIN COUNTY. DOPPLER RADAR
  HAS ESTIMATED THAT 4 INCHES OF RAIN HAS FALLEN DURING THE PAST 3 HOURS
  TO THE WEST OF THE WARNED AREA. SIMILAR AMOUNTS WILL BE POSSIBLE ACROSS
  THE WARNED AREA.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CHIPPEWA FALLS...EAU CLAIRE...ALTOONA...BATEMAN...BOYD...
  BRACKETT...CADOTT...FAIRCHILD...FALL CREEK...FOSTER...LAKE
  HALLIE...LAKE WISSOTA...LUDINGTON AND STANLEY.

THERE HAVE REPORTS OF FLOODED ROADS IN SOUTHERN PIERCE COUNTY WITH THESE
THUNDERSTORMS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

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 4459 9165 4501 9166 4500 9091 4459 9092

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 8:38 PM CDTSpecial Weather StatementMPXPierce37 min
Aug 13, 8:40 PM CDTSevere Thunderstorm WarningMPXPierce35 min
Aug 13, 9:45 PM CDTFlash Flood WarningMPXDunn, Pepin, Pierce3 hr
Aug 13, 10:16 PM CDTSpecial Weather StatementMPXPepin44 min
Aug 13, 11:05 PM CDTSpecial Weather StatementMPXChippewa, Eau Claire55 min
Aug 14, 12:11 AM CDTFlash Flood WarningMPXDunn, Pepin, Pierce6 hr
Aug 14, 12:43 AM CDTSpecial Weather StatementMPXPepin47 min

Nearby

Flash Flood Warnings in Wisconsin, 2009Every flash flood warning in 2009

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.