Alert archive / Iowa / Severe Thunderstorm Warnings in 1993
Severe Thunderstorm Warning 20, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at May 27, 1993, 7:35 PM CDT for Marshall County, Story County, Iowa. It was in force for 25 min.
The area
The counties it named.
The facts
- Issued
- May 27, 1993, 7:35 PM CDT (00:35 UTC)
- Expired
- May 27, 1993, 8:00 PM CDT
- In force
- 25 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Marshall County, IA, Story County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.6 hours before the alert went out and 272 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
- 1369 J/kg
- Mixed-layer CIN
- -96 J/kg
- Mixed-layer LCL
- 1893 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 184 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 7.1
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, May 27, 7:00 PM CDT, 35 minutes before
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</html>Special weather statement, May 27, 7:20 PM CDT, 15 minutes before
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</html>Special weather statement, May 27, 7:20 PM CDT, 15 minutes before
IAZ060-280115- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 720 PM CDT THU MAY 27 1993 ...STRONG THUNDERSTORMS COULD PUSH ACROSS THE DES MOINES AREA BETWEEN 730 AND 815 PM THIS EVENING... A LINE OF THUNDERSTORMS WAS LOCATED ABOUT 25 MILES NORTH OF DES MOINES AS OF 715 PM. ALTHOUGH THE INDIVIDUAL STORMS WERE MOVING EAST...THE LINE WAS TENDING TO SAG SOUTH. IT IS LIKELY THAT THESE THUNDERSTORMS COULD REACH NORTH PARTS OF THE DES MOINES METRO AREA BETWEEN 730 AND 815 PM. ALTHOUGH MORE LIKELY ACROSS NORTH SECTIONS...IT IS POSSIBLE THAT THE STORMS COULD MOVE NEAR THE DOWNTOWN AREA...INCLUDING SEC TAYLOR STADIUM...BETWEEN 815 AND 830 PM. A PERIOD OF HEAVY RAIN...GUSTY WINDS...DANGEROUS LIGHTNING AND PERHAPS SOME HAIL CAN BE EXPECTED WITH THESE STORMS. FELDT
Special weather statement, May 27, 7:25 PM CDT, 10 minutes before
IAZ006>011-016>019-026>029-038>040-280130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 725 PM CDT THU MAY 27 1993 ...STRONG THUNDERSTORMS MOVING INTO GRUNDY COUNTY... A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR NORTHEAST AND NORTH CENTRAL IOWA UNTIL 10 PM TO THE EAST OF HIGHWAY 65. THE WATCH ALSO DOES NOT INCLUDE BUCHANAN COUNTY. AT 715 PM RADAR INDICATED STRONG THUNDERSTORM IN SOUTHEAST GRUNDY COUNTY BETWEEN WHITTEN AND GRUNDY CENTER. THESE STORMS WILL AFFECT THE GRUNDY CENTER AREA BY 730 PM AND DIKE BY 745 PM. THESE STORMS WILL LIKELY PRODUCE BRIEF DOWNPOURS... STRONG WINDS AND SMALL HAIL. ANOTHER AREA OF THUNDERSTORMS WAS JUST WEST OF WATERLOO AND WILL AFFECT THE WATERLOO AND WAVERLY AREAS THROUGH 8 PM. THESE STORMS WERE WEAKENING BUT STILL WILL PRODUCE BRIEF STRONG WINDS AND HEAVY DOWNPOURS. DP
Special weather statement, May 27, 7:27 PM CDT, 8 minutes before
IAZ006>011-016>019-026>029-038>040-280130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 725 PM CDT THU MAY 27 1993 ...STRONG THUNDERSTORMS MOVING INTO GRUNDY COUNTY... A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR NORTHEAST AND NORTH CENTRAL IOWA UNTIL 10 PM TO THE EAST OF HIGHWAY 65. THE WATCH ALSO DOES NOT INCLUDE BUCHANAN COUNTY. AT 715 PM RADAR INDICATED STRONG THUNDERSTORM IN SOUTHEAST GRUNDY COUNTY BETWEEN WHITTEN AND GRUNDY CENTER. THESE STORMS WILL AFFECT THE GRUNDY CENTER AREA BY 730 PM AND DIKE BY 745 PM. THESE STORMS WILL LIKELY PRODUCE BRIEF DOWNPOURS... STRONG WINDS AND SMALL HAIL. ANOTHER AREA OF THUNDERSTORMS WAS JUST WEST OF WATERLOO AND WILL AFFECT THE WATERLOO AND WAVERLY AREAS THROUGH 8 PM. THESE STORMS WERE WEAKENING BUT STILL WILL PRODUCE BRIEF STRONG WINDS AND HEAVY DOWNPOURS. DP
Special weather statement, May 27, 7:34 PM CDT, 1 minute before
IAZ006>011-016>019-026>029-038>040-280130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 725 PM CDT THU MAY 27 1993 ...STRONG THUNDERSTORMS MOVING INTO GRUNDY COUNTY... A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR NORTHEAST AND NORTH CENTRAL IOWA UNTIL 10 PM TO THE EAST OF HIGHWAY 65. THE WATCH ALSO DOES NOT INCLUDE BUCHANAN COUNTY. AT 715 PM RADAR INDICATED STRONG THUNDERSTORM IN SOUTHEAST GRUNDY COUNTY BETWEEN WHITTEN AND GRUNDY CENTER. THESE STORMS WILL AFFECT THE GRUNDY CENTER AREA BY 730 PM AND DIKE BY 745 PM. THESE STORMS WILL LIKELY PRODUCE BRIEF DOWNPOURS... STRONG WINDS AND SMALL HAIL. ANOTHER AREA OF THUNDERSTORMS WAS JUST WEST OF WATERLOO AND WILL AFFECT THE WATERLOO AND WAVERLY AREAS THROUGH 8 PM. THESE STORMS WERE WEAKENING BUT STILL WILL PRODUCE BRIEF STRONG WINDS AND HEAVY DOWNPOURS. DP
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 7:07 PM CDT | Severe Thunderstorm Warning | DMX | Story | 38 min |
| May 27, 7:53 PM CDT | Tornado Warning | DMX | Marshall | 27 min |
| May 27, 8:12 PM CDT | Tornado Warning | DMX | Black Hawk | 33 min |
| May 27, 8:41 PM CDT | Severe Thunderstorm Warning | DMX | Buchanan | 50 min |
| May 27, 8:48 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 34 min |
| May 27, 11:07 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Madison | 23 min |
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.