Alert archive / Iowa / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 2, NWS La Crosse, WI

April 5, 1997Fayette County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at Apr 5, 1997, 3:13 PM CST for Fayette County, Iowa. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 5, 1997, 3:13 PM CST (21:13 UTC)
Expired
Apr 5, 1997, 3:45 PM CST
In force
32 min
Issued by
NWS La Crosse, WI
Area
Whole counties

County Fayette County, IA

The radar

The La Crosse radar (KARX), 119 km from the middle of the area, began a volume at 21:17 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 5, 2:30 PM CSTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.2 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, Davenport, at 12:00Z on 1997-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 1997-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
515 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
99 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 052114 RRA
SVRLSE
IAC037-065-067-052145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
313 PM CST SAT APR 5 1997

* SEVERE THUNDERSTORM WARNING FOR
    FLOYD COUNTY - NORTHEASTERN IOWA
    CHICKASAW COUNTY - NORTHEASTERN IOWA
    FAYETTE COUNTY - NORTHEASTERN IOWA

* UNTIL 345 PM CST
 
* SOME LOCATIONS AFFECTED
    CHARLES CITY
    NEW HAMPTON
    WEST UNION

* AT 310 PM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE
  OF SEVERE THUNDERSTORMS FROM 20 TO 25 MILES SOUTHWEST OF CHARLES
  CITY TO 30 SOUTH OF WEST UNION. THIS LINE OF STORMS WAS MOVING
  NORTH AT 40 MPH.

* THESE STORMS WILL BE NEAR MARBLE ROCK AND FREDRICKSBURG BY 325 KPM.

THE MAIN THREAT FROM THESE STORMS IS DAMAGING WINDS. DO NOT GO
OUTDOORS.


RIECK/RACY

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 5, 3:13 PM CSTSevere Thunderstorm WarningARXChickasaw, Floyd32 min
Apr 5, 4:03 PM CSTSevere Thunderstorm WarningARXWinneshiek32 min
Apr 5, 4:24 PM CSTSevere Thunderstorm WarningARXAllamakee61 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1997Every severe thunderstorm 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.