Alert archive / Minnesota / Flash Flood Warnings in 1997

Flash Flood Warning 8, NWS La Crosse, WI

July 20, 1997Winona County, Minnesota

NWS La Crosse, WI issued this flash flood warning at Jul 20, 1997, 8:51 PM CDT for Winona County, Minnesota. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 20, 1997, 8:51 PM CDT (01:51 UTC)
Expired
Jul 20, 1997, 11:30 PM CDT
In force
3 hr
Issued by
NWS La Crosse, WI
Area
Whole counties

County Winona County, MN

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.9 hours before the alert went out and 174 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 1997-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1231 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 1997-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -22 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
1231 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
1020 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-22 m²/s²
0-3 km storm-relative helicity
31 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLSE 210153
FFWLSE
MNC169-210430-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
851 PM CDT SUN JUL 20 1997

* FLASH FLOOD WARNING FOR
    SOUTHERN WINONA COUNTY - SOUTHEASTERN MINNESOTA

* UNTIL 1130 PM CDT
 
* SOME LOCATIONS OR STREAMS AFFECTED
    WITOKA
    CENTERVILLE
    RIDGEWAY
    CLYDE

* CAUSE AND EFFECT...
    RAINFALL OF UP TO 2 INCHES SINCE 745 PM HAS CAUSED FLASH
    FLOODING IN THE WITOKA AREA...ABOUT 10 MILES SOUTH OF WINONA.

* FORECAST CONDITIONS...
    HEAVY RAIN IS EXPECTED TO CONTINUE IN THE AREA FOR UNTIL AROUND
    10 PM./

LEAVE FLOOD PRONE AND LOW LYING AREAS IMMEDIATELY.

RRS
 

&

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 20, 7:25 PM CDTTornado WarningARXDodge, Olmsted65 min
Jul 20, 8:02 PM CDTSevere Thunderstorm WarningARXWinona63 min
Jul 20, 8:19 PM CDTTornado WarningARXWinona41 min
Jul 20, 8:29 PM CDTTornado WarningARXOlmsted36 min
Jul 20, 8:52 PM CDTTornado WarningARXHouston58 min
Jul 20, 9:00 PM CDTTornado WarningARXWinona45 min
Jul 20, 9:15 PM CDTTornado WarningARXFillmore, Mower60 min
Jul 20, 10:15 PM CDTSevere Thunderstorm WarningARXFillmore45 min

Nearby

Flash Flood Warnings in Minnesota, 1997Every flash flood warning in 1997

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.