Alert archive / Iowa / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 4, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Apr 5, 1997, 6:56 PM CST for Sac County, Iowa. It was in force for 34 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, 6:56 PM CST (00:56 UTC)
- Expired
- Apr 5, 1997, 7:30 PM CST
- In force
- 34 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Sac County, IA
The radar
The Des Moines radar (KDMX), 135 km from the middle of the area, began a volume at 00:56 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
Omaha, NE (KOAX), launched 00:00Z, 0.9 hours before the alert went out and 158 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.
- Mixed-layer CAPE
- 89 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 1566 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 103 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDSM 060055 RRA
SVRDSM
IAC161-060130-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
656 PM CST SAT APR 5 1997
* SEVERE THUNDERSTORM WARNING FOR
SAC COUNTY - WEST CENTRAL IOWA
* UNTIL 730 PM CST
* SOME AREAS AFFECTED
ODEBOLT
LAKE VIEW
SAC CITY
* AT 654 PM CST RADAR INDICATED A SEVERE THUNDERSTORM 3 MILES SOUTH OF
ODEBOLT...OR ABOUT 60 MILES SOUTHWEST OF FORT DODGE MOVING NORTHEAST
AT 30 MPH.
* THE STORM WILL BE NEAR LAKE VIEW BY 705 PM AND THROUGH SAC CITY BY
715 PM CST.
THIS IS A DANGEROUS STORM. DO NOT GO OUTDOORS.
SMITHWhat forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Apr 5, 3:48 PM CST, 3 hours 8 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-052245- SPECIAL WEATHER STATEMENT...CORRECTED NATIONAL WEATHER SERVICE DES MOINES IA 342 PM CST SAT APR 5 1997 ...THE SEVERE THUNDERSTORM WATCH FOR NORTHERN IOWA HAS BEEN CANCELLED BUT REMAINS IN EFFECT FOR EASTERN IOWA UNTIL 7 PM CST... THE THUNDERSTORMS WHICH PRODUCED WIND GUSTS TO 70 MPH HAVE EXITED CENTRAL IOWA AND CONTINUE TO MOVE NORTHEAST AT 40 MPH. AS A RESUfLT THE SEVERE THUNDERSTORM WATCH FOR CENTRAL IOWA HAS BEEN CANCELLED. CLEARING CONDITIONS WILL MOVE ACROSS IOWA FROM THE SOUTH THROUGH EARLY EVENING BUT SHOWERS WIILL REDEVELOP ACROSS THE AREA AFTER 10 PM. FAB
Special weather statement, Apr 5, 3:49 PM CST, 3 hours 7 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-052245- SPECIAL WEATHER STATEMENT...CORRECTED NATIONAL WEATHER SERVICE DES MOINES IA 342 PM CST SAT APR 5 1997 ...THE SEVERE THUNDERSTORM WATCH FOR NORTHERN IOWA HAS BEEN CANCELLED BUT REMAINS IN EFFECT FOR EASTERN IOWA UNTIL 7 PM CST... THE THUNDERSTORMS WHICH PRODUCED WIND GUSTS TO 70 MPH HAVE EXITED CENTRAL IOWA AND CONTINUE TO MOVE NORTHEAST AT 40 MPH. AS A RESULT THE SEVERE THUNDERSTORM WATCH FOR NORTHERN IOWA HAS BEEN CANCELLED. THE STORMS WILL CONTINUE TO MOVE ACROSS EASTERN IOWA WHERE THE WATCH REMAINS IN EFFECT. CLEARING CONDITIONS WILL MOVE ACROSS IOWA FROM THE SOUTH THROUGH EARLY EVENING BUT SHOjWERS WIILL REDEVELOP ACROSS THE AREA AFTER 10 PM. FAB
Special weather statement, Apr 5, 5:10 PM CST, 1 hour 46 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-060200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 510 PM CST SAT APR 5 1997 ...THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT FOR A PORTION OF EASTERN IOWA HAS BEEN CANCELLED... THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT FOR A PORTION OF EASTERN IOWA HAS BEEN CANCELLED. THE STORMS THAT PROMPTED THE ISSUANCE OF THE WATCH HAVE MOVED RAPIDLY OUT OF THE STATE AND NO LONGER POSE A THREAT THIS EVENING. ADDITIONAL SHOWERS AND THUNDERSTORMS WERE MOVING RAPIDLY OUT OF SOUTHWEST IOWA INTO CENTRAL IOWA. PRESENT INDICATIONS SUGGEST THERE IS THE POTENTIAL FOR SOME SMALL HAIL WITH THESE STORMS...HOWEVER NO WIDEPSREAD SEVERE WEATHER IS EXPECTED WITH THESE STORMS AS THEY TRACK ACROSS THE STATE. SMITH
Special weather statement, Apr 5, 5:11 PM CST, 1 hour 45 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-060200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 510 PM CST SAT APR 5 1997 ...THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT FOR A PORTION OF EASTERN IOWA HAS BEEN CANCELLED... THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT FOR A PORTION OF EASTERN IOWA HAS BEEN CANCELLED. THE STORMS THAT PROMPTED THE ISSUANCE OF THE WATCH HAVE MOVED RAPIDLY OUT OF THE STATE AND NO LONGER POSE A THREAT THIS EVENING. ADDITIONAL SHOWERS AND THUNDERSTORMS WERE MOVING RAPIDLY OUT OF SOUTHWEST IOWA INTO CENTRAL IOWA. PRESENT INDICATIONS SUGGEST THERE IS THE POTENTIAL FOR SOME SMALL HAIL WITH THESE STORMS...HOWEVER NO WIDEPSREAD SEVERE WEATHER IS EXPECTED WITH THESE STORMS AS THEY TRACK ACROSS THE STATE. SMITH
Special weather statement, Apr 5, 6:47 PM CST, 9 minutes before
IAZ033-044>045-060200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 648 PM CST SAT APR 5 1997 ...SEVERE THUNDERSTORM WARNING HAS EXPIRED FOR NORTHWEST CRAWFORD COUNTY... THE SEVERE THUNDERSTORM WARNING THAT WAS IN EFFECT FOR NORTHWEST CRAWFORD COUNTY HAS EXPIRED. OTHER THAN THE GOLF BALL SIZE HAIL THAT WAS REPORTED IN CHARTER OAK AROUND 630 PM...NO OTHER REPORTS WERE RECEIVED. SMITH
Special weather statement, Apr 5, 6:48 PM CST, 8 minutes before
IAZ033-044>045-060200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 648 PM CST SAT APR 5 1997 ...SEVERE THUNDERSTORM WARNING HAS EXPIRED FOR NORTHWEST CRAWFORD COUNTY... THE SEVERE THUNDERSTORM WARNING THAT WAS IN EFFECT FOR NORTHWEST CRAWFORD COUNTY HAS EXPIRED. OTHER THAN THE GOLF BALL SIZE HAIL THAT WAS REPORTED IN CHARTER OAK AROUND 630 PM...NO OTHER REPORTS WERE RECEIVED. SMITH
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 6:26 PM CST | Severe Thunderstorm Warning | DMX | Crawford | 19 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.