Alert archive / Missouri / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 90, NWS St. Louis, MO

May 25, 1997Washington County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at May 25, 1997, 10:47 PM CDT for Washington County, Missouri. It was in force for 43 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
May 25, 1997, 10:47 PM CDT (03:47 UTC)
Expired
May 25, 1997, 11:30 PM CDT
In force
43 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Washington County, MO

The radar

The St Louis radar (KLSX), 84 km from the middle of the area, began a volume at 03:48 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

Springfield, MO (KSGF), launched 00:00Z, 3.8 hours before the alert went out and 284 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, Springfield, MO at 00:00Z on 1997-05-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 418 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, Springfield, MO at 00:00Z on 1997-05-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 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
418 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
1632 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
94 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

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

999 
WUUS1 KSTL 260348 RRA
SVRSTL
MOC221-260430-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1047 PM CDT SUN MAY 25 1997
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1130 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN EAST CENTRAL MISSOURI
 
   ...SOUTHERN WASHINGTON COUNTY
 
AT 1045 PM CDT...DOPPLER RADAR SHOWED A SEVERE THUNDERSTORM OVER
SOUTHERN WASHINGTON COUNTY...5 TO 7 MILES WEST OF POTOSI. THE SEVERE
THUNDERSTORM WAS MOVING TO THE SOUTHEAST AT 20 MPH AND WILL AFFECT THE
TOWNS OF IRONDALE...AND CALEDONIA.
 
HAIL IS THE PRIMARY THREAT OF SEVERE WEATHER WITH THIS STORM.
 
THIS STORM HAS A HISTORY OF DAMAGING HAIL. STAY INSIDE AND AWAY
FROM WINDOWS.
 
 
BW/RP

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 25, 7:13 PM CDTSevere Thunderstorm WarningLSXGasconade47 min
May 25, 7:14 PM CDTSevere Thunderstorm WarningLSXFranklin, Saint Louis46 min
May 25, 7:36 PM CDTSevere Thunderstorm WarningLSXFranklin54 min
May 25, 7:49 PM CDTSevere Thunderstorm WarningLSXJefferson56 min
May 25, 8:12 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Warren33 min
May 25, 8:18 PM CDTSevere Thunderstorm WarningLSXCrawford, Washington42 min
May 25, 8:46 PM CDTSevere Thunderstorm WarningLSXJefferson44 min
May 25, 9:24 PM CDTSevere Thunderstorm WarningLSXSainte Genevieve51 min
May 26, 3:15 AM CDTFlash Flood WarningLSXCole, Osage3 hr
May 26, 4:43 AM CDTSevere Thunderstorm WarningLSXSainte Genevieve, Saint Francois47 min
May 26, 2:29 PM CDTSevere Thunderstorm WarningLSXMadison31 min
May 26, 5:39 PM CDTSevere Thunderstorm WarningLSXMadison51 min

Nearby

Severe Thunderstorm Warnings in Missouri, 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.