Alert archive / Iowa / Severe Thunderstorm Warnings in 1993
Severe Thunderstorm Warning 207, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 9, 1993, 8:40 PM CDT for Butler County, Iowa. It was in force for 50 min.
The area
The counties it named.
The facts
- Issued
- Aug 9, 1993, 8:40 PM CDT (01:40 UTC)
- Expired
- Aug 9, 1993, 9:30 PM CDT
- In force
- 50 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Butler County, IA
The nearest sounding before it
Minneapolis, MN (KSTC), launched 00:00Z, 1.7 hours before the alert went out and 244 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
- 490 J/kg
- Mixed-layer CIN
- -81 J/kg
- Mixed-layer LCL
- 1739 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, Aug 9, 7:49 PM CDT, 51 minutes before
IAZALL-100140- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 740 PM CDT MON AUG 9 1993 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MUCH OF THE NORTHERN HALF OF IOWA UNTIL 10 PM THIS EVENING... AT 730 PM CDT...INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN AND HAIL WERE LOCATED OVER NORTH CENTRAL AND NORTHEAST IOWA. THESE THUNDERSTORMS WERE LOCATED NORTH AND EAST OF A LINE EXTENDING FROM SIOUX CITY TO DUBUQUE. THE HEAVIEST THUNDERSTORMS WERE LOCATED IN THE MASON CITY AREA...AND ALSO JUST NORTHEAST OF WATERLOO. VERY HEAVY RAIN AND HAIL MAY BE EXPECTED WITH THE PASSAGE OF THESE THUNDERSTORMS. THE THUNDERSTORMS WERE MOVING SOUTHEAST AT 35 MILES ANV HOUR. SCOTT
Special weather statement, Aug 9, 7:59 PM CDT, 41 minutes before
IAZALL-100300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 800 PM CDT MON AUG 9 1993 ...SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR MUCH OF NORTHERN IOWA UNTIL 10 PM... SCATTERED THUNDERSTORMS HAD RAPIDLY DEVELOPED OVER NORTHWEST IOWA AND OVER PARTS OF NORTH CENTRAL IOWA SINCE 7PM. THE STRONGEST OF THESE STORMS WAS LOCATED EAST OF ESTHERVILLE IN EXTREME NORTHWEST IOWA. BRIEF HEAVY RAINS...DANGEROUS LIGHTNING...AND WIND GUSTS UP TO 45 MILES AN HOUR CAN BE EXPECTED WITH THE STRONGER STORMS. IN CENTRAL AND SOUTHERN IOWA...SKIES WERE MOSTLY CLEAR. ISOLATED THUNDERSTORMS COULD MOVE OR DEVELOP IN THE CEDAR RAPIDS AREA BY 9PM... AND POSSIBLY DEVELOP IN THE AMES AND BOONE AREAS AROUND 10 PM. . JM
Special weather statement, Aug 9, 8:00 PM CDT, 40 minutes before
IAZALL-100300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 800 PM CDT MON AUG 9 1993 ...SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR MUCH OF NORTHERN IOWA UNTIL 10 PM... SCATTERED THUNDERSTORMS HAD RAPIDLY DEVELOPED OVER NORTHWEST IOWA AND OVER PARTS OF NORTH CENTRAL IOWA SINCE 7PM. THE STRONGEST OF THESE STORMS WAS LOCATED EAST OF ESTHERVILLE IN EXTREME NORTHWEST IOWA. BRIEF HEAVY RAINS...DANGEROUS LIGHTNING...AND WIND GUSTS UP TO 45 MILES AN HOUR CAN BE EXPECTED WITH THE STRONGER STORMS. IN CENTRAL AND SOUTHERN IOWA...SKIES WERE MOSTLY CLEAR. ISOLATED THUNDERSTORMS COULD MOVE OR DEVELOP IN THE CEDAR RAPIDS AREA BY 9PM... AND POSSIBLY DEVELOP IN THE AMES AND BOONE AREAS AROUND 10 PM. . JM WWJP20RJTD,g
Special weather statement, Aug 9, 8:20 PM CDT, 20 minutes before
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</html>Special weather statement, Aug 9, 8:25 PM CDT, 15 minutes before
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</html>Special weather statement, Aug 9, 8:40 PM CDT, 0 minutes before
IAZALL-100240- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 840 PM CDT MON AUG 9 1993 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MUCH OF THE NORTHERN HALF OF IOWA UNTIL 10 PM THIS EVENING... AT 830 PM CDT...INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN AND HAIL WERE LOCATED OVER NORTH CENTRAL AND NORTHEAST IOWA...AND DEVELOPING IN NORTH WEST IOWA. THESE THUNDERSTORMS WERE LOCATED NORTH OF A LINE EXTENDING FROM SIOUX CITY TO DAVENPORT. THE HEAVIEST THUNDERSTORMS IN NORTH CENTRAL IOWA WERE LOCATED ALONG A LINE EXTENDING FROM BELMOND...25 MILES SOUTHWEST OF MASON CITY...TO CHARLES CITY...30 MILES EAST OF MASON CITY. VERY HEAVY RAINS...WINDS IN EXCESS OF 40 MILES AN HOUR...AND HAIL MAY BE EXPECTED WITH THE PASSAGE OF THESE THUNDERSTORMS. THE THUNDERSTORMS WERE MOVING SOUTHEAST AT 35 MILES AN HOUR. SCOTT
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 7:05 PM CDT | Severe Thunderstorm Warning | DMX | Worth | 33 min |
| Aug 9, 7:35 PM CDT | Severe Thunderstorm Warning | DMX | Buchanan | 55 min |
| Aug 9, 8:00 PM CDT | Flash Flood Warning | DMX | Chickasaw | 3 hr |
| Aug 9, 8:33 PM CDT | Severe Thunderstorm Warning | DMX | Linn | 42 min |
| Aug 9, 10:40 PM CDT | Flash Flood Warning | DMX | Chickasaw | 2 hr |
| Aug 9, 10:48 PM CDT | Flash Flood Warning | DMX | Linn | 4 hr |
| Aug 9, 11:19 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun | 26 min |
| Aug 9, 11:19 PM CDT | Severe Thunderstorm Warning | DMX | Greene | 41 min |
| Aug 9, 11:31 PM CDT | Flash Flood Warning | DMX | Iowa | 3 hr |
Nearby
Severe Thunderstorm Warnings in Iowa, 1993Every severe thunderstorm warning in 1993
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.