Alert archive / Iowa / Flash Flood Warnings in 1997

Flash Flood Warning 5, NWS La Crosse, WI

June 23, 1997Allamakee County, Clayton County, Iowa

NWS La Crosse, WI issued this flash flood warning at Jun 23, 1997, 1:06 AM CDT for Allamakee County, Clayton County, Iowa. It was in force for 4 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
Jun 23, 1997, 1:06 AM CDT (06:06 UTC)
Expired
Jun 23, 1997, 5:10 AM CDT
In force
4 hr
Issued by
NWS La Crosse, WI
Area
Whole counties

Counties Allamakee County, IA, Clayton County, IA

The radar

The La Crosse radar (KARX), 85 km from the middle of the area, began a volume at 06:08 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.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 6.1 hours before the alert went out and 175 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, Davenport, at 00:00Z on 1997-06-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3560 joules per kilogram.LCLEL10008507005003002001001 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, Davenport, at 00:00Z on 1997-06-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 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
3560 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
971 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
65 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KLSE 230607
FFWLSE
IAC005-043-231010-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
106 AM CDT MON JUN 23 1997

* FLASH FLOOD WARNING FOR
    SOUTHERN ALLAMAKEE COUNTY - NORTHEASTERN IOWA
    CLAYTON COUNTY - NORTHEASTERN IOWA

* UNTIL 510 AM CDT
 
* SOME LOCATIONS OR STREAMS AFFECTED
    LUANA
    VOLNEY
    VOLGA
    VOLGA RIVER
    SILVER CREEK

* CAUSE AND EFFECT...
    VERY HEAVY RAINS FROM THUNDERSTORMS WERE FALLING ON SATURATED
    GROUNDS. THE STORMS WERE MOVING EAST AT 10 MPH AND WILL AFFECT
    THESE LOCATIONS THROUGH 3AM.

* FORECAST CONDITIONS...
    AN ADDITIONAL INCH OF RAIN IS POSSIBLE BETWEEN 1 AM AND 3 AM.

LEAVE FLOOD PRONE AND LOW` LYING AREAS IMMEDIATELY.

RACY/NELSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 22, 9:33 PM CDTSevere Thunderstorm WarningARXFloyd72 min
Jun 22, 10:28 PM CDTSevere Thunderstorm WarningARXMitchell62 min
Jun 22, 11:17 PM CDTSevere Thunderstorm WarningARXHoward33 min

Nearby

Flash Flood Warnings in Iowa, 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; radar from the NEXRAD Level II archive.