Alert archive / Iowa / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 93, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 27, 1997, 1:38 PM CDT for Pocahontas 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
- Jul 27, 1997, 1:38 PM CDT (18:38 UTC)
- Expired
- Jul 27, 1997, 2:10 PM CDT
- In force
- 32 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Pocahontas County, IA
The radar
The Des Moines radar (KDMX), 137 km from the middle of the area, began a volume at 18:40 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 12:00Z, 6.6 hours before the alert went out and 210 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
- 1764 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 1052 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDSM 271838 RRA
SVRDSM
IAC151-271910-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
138 PM CDT SUN JUL 27 1997
* SEVERE THUNDERSTORM WARNING FOR
NORTHERN POCAHONTAS COUNTY - NORTHWESTERN IOWA
* UNTIL 210 PM CDT
* SOME AREAS AFFECTED
LAURENS
HAVELOCK
PLOVER
ROLFE
* AT 135 PM CDT LOCAL LAW ENFORCEMENT REPORTED A SEVERE THUNDERSTORM
NEAR LAURENS OR 40 MILES NORTHWEST OF FORT DODGE MOVING EAST AT 15
MPH. TORRENTIAL RAINS ARE ALSO LIKELY.
* THE STORM WILL BE NEAR HAVELOCK BY 150 PM CDT.
THIS IS A DANGEROUS STORM. DO NOT GO OUTDOORS.
A TREE WAS REPORTED DOWN IN LAURENS BY COUNTY SHERIFF.
SCHAFER
&What 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, Jul 27, 10:05 AM CDT, 3 hours 33 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-272100- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 1005 AM CDT SUN JUL 27 1997 HAZARD--THUNDERSTORMS PRODUCING LOCALIZED HEAVY RAIN...POSSIBLY DAMAGING DOWNDRAFTS. AREA OF CONCERN AND TIMING--THROUGH MID AFTERNOON...TWO AREAS OF CONCERN...BOTH GENERALLY NORTH OF HIGHWAY 20. A CLUSTER OF STORMS OVER SOUTHEAST NEBRASKA WAS OCCASIONALLY PRODUCING WIND GUSTS TO 60 MPH. THIS WILL MOVE INTO NORTHWEST IOWA BY MIDDAY. ANOTHER AREA OF DEVELOPING STORMS WAS LOCATED OVER NORTHEAST IOWA. THESE STORMS WILL CONTINUE TO DEVELOP AND STRENGTHEN THROGH MIDDAY. IN ADDITION TO WIND...HAIL IS POSSIBLE WITH THESE STORMS. OUTLOOK...THUNDERSTORMS COULD DROP SLOWLY INTO CENTRAL IOWA LATE THIS AFTERNOON OR EVENING. PRECAUTIONS: ALTHOUGH WIDESPREAD SEVERE WEATHER IS NOT EXPECTED WITH THESE STORMS...SCATTERED STORMS COULD PRODUCE DAMAGING WINDS OR HAIL. FELDT
Special weather statement, Jul 27, 10:06 AM CDT, 3 hours 32 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-272100- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 1005 AM CDT SUN JUL 27 1997 HAZARD--THUNDERSTORMS PRODUCING LOCALIZED HEAVY RAIN...POSSIBLY DAMAGING DOWNDRAFTS. AREA OF CONCERN AND TIMING--THROUGH MID AFTERNOON...TWO AREAS OF CONCERN...BOTH GENERALLY NORTH OF HIGHWAY 20. A CLUSTER OF STORMS OVER SOUTHEAST NEBRASKA WAS OCCASIONALLY PRODUCING WIND GUSTS TO 60 MPH. THIS WILL MOVE INTO NORTHWEST IOWA BY MIDDAY. ANOTHER AREA OF DEVELOPING STORMS WAS LOCATED OVER NORTHEAST IOWA. THESE STORMS WILL CONTINUE TO DEVELOP AND STRENGTHEN THROGH MIDDAY. IN ADDITION TO WIND...HAIL IS POSSIBLE WITH THESE STORMS. OUTLOOK...THUNDERSTORMS COULD DROP SLOWLY INTO CENTRAL IOWA LATE THIS AFTERNOON OR EVENING. PRECAUTIONS: ALTHOUGH WIDESPREAD SEVERE WEATHER IS NOT EXPECTED WITH THESE STORMS...SCATTERED STORMS COULD PRODUCE DAMAGING WINDS OR HAIL. FELDT
Special weather statement, Jul 27, 12:30 PM CDT, 1 hour 8 minutes before
IAZ033>039-044>050-057>062-070>075-081>086-092>097-272100 SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 1230 PM CDT SUN JUL 27 1997 ADVISORY INFORMATION--A HEAT ADVISORY IS IN EFFECT FOR CENTRAL AND SOUTHERN IOWA TONIGHT AND SUNDAY...MAINLY ALONG AND SOUTH OF HIGHWAY 30. THE ADVISORY HAS BEEN CANCELLED NORTH OF HIGHWAY 30 DUE TO CLOUDS AND RAIN IN THE AREA. FORECAST CONDITIONS--HEAT INDICES FROM 100 TO 115 THIS AFTERNOON AND EVENING WILL ONCE AGAIN OCCUR AS TEMPERATURES RISE INTO THE MID OR UPPER 90S ALONG WITH DEW POINTS IN THE MID 70S TO LOWER 80S. PRECAUTIONS...THIS WILL BE THE LAST DAY OF OPPRESSIVE HEAT...SO BE SURE TO TAKE IT EASY AND DRINK PLENTY OF FLUIDS. IF YOU ARE UNSURE AS TO YOUR ABILITY TO COPE WITH THE HEAT...SEEK ADEQUATE SHELTER.
Special weather statement, Jul 27, 12:42 PM CDT, 56 minutes before
IAZ033>039-044>050-057>062-070>075-081>086-092>097-272100 SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 1230 PM CDT SUN JUL 27 1997 ADVISORY INFORMATION--A HEAT ADVISORY IS IN EFFECT FOR CENTRAL AND SOUTHERN IOWA TONIGHT AND SUNDAY...MAINLY ALONG AND SOUTH OF HIGHWAY 30. THE ADVISORY HAS BEEN CANCELLED NORTH OF HIGHWAY 30 DUE TO CLOUDS AND RAIN IN THE AREA. FORECAST CONDITIONS--HEAT INDICES FROM 100 TO 115 THIS AFTERNOON AND EVENING WILL ONCE AGAIN OCCUR AS TEMPERATURES RISE INTO THE MID OR UPPER 90S ALONG WITH DEW POINTS IN THE MID 70S TO LOWER 80S. PRECAUTIONS...THIS WILL BE THE LAST DAY OF OPPRESSIVE HEAT...SO BE SURE TO TAKE IT EASY AND DRINK PLENTY OF FLUIDS. IF YOU ARE UNSURE AS TO YOUR ABILITY TO COPE WITH THE HEAT...SEEK ADEQUATE SHELTER.
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 1:41 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 34 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.