Alert archive / Iowa / Severe Thunderstorm Warnings in 1993
Severe Thunderstorm Warning 177, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 27, 1993, 9:44 PM CDT for Linn County, Iowa. It was in force for 46 min.
The area
The counties it named.
The facts
- Issued
- Jul 27, 1993, 9:44 PM CDT (02:44 UTC)
- Expired
- Jul 27, 1993, 10:30 PM CDT
- In force
- 46 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Linn County, IA
The nearest sounding before it
Minneapolis, MN (KSTC), launched 00:00Z, 2.7 hours before the alert went out and 348 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
- 175 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 1555 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 35 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, Jul 27, 6:40 PM CDT, 3 hours 4 minutes before
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</html>Special weather statement, Jul 27, 6:47 PM CDT, 2 hours 57 minutes before
IAZALL-280040- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 642 PM CDT TUE JUL 27 1993 ...A TORNADO WATCH IS IN EFFECT FOR THE EASTERN TWO THIRDS OF IOWA UNTIL 10PM... AT 633 PM CDT...VERY STRONG THUNDERSTORMS PERSISTED OVER CENTRAL IOWA. THESE STORMS WERE CLUSTERED BETWEEN OGDEN...STORY CITY AND 10 MILES EAST OF NEVADA...OR WITHIN A 25 MILE RADIUS OF AMES. THE STORMS IN THIS AREA WILL PRODUCE VERY HEAVY RAIN...FREQUENT DEADLY LIGHTNING AND SOME PEA TO MARBLE SIZED HAIL. THESE STORMS WERE PART OF A 25 TO 45 MILE WIDE AREA OF SHOWERS AND STORMS THAT EXTENDED FROM 45 MILES WEST OF DES MOINES NEAR ADAIR NORTHEAST TO INDEPENDENCE. INDEPENDENCE IS 20 MILES EAST OF WATERLOO. ISOLATED THUNDERSTORMS WERE LOCATED 10 MILES SOUTHWEST OF MASON CITY AND BETWEEN CHARLES CITY AND CRESCO. CHARLES CITY IS 30 MILES EAST OF WATERRLOO WHILE CRESCO IS 55 MILES NORTHEAST OF MASON CITY. THE SHOWERS AND STORMS MOVING EAST NORTHEAST AT 30 MILES AN HOUR. BARLOW/PRENTICE
Special weather statement, Jul 27, 7:51 PM CDT, 1 hour 53 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-280230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 750 PM CDT TUE JUL 27 1993 ...THUNDERSTORMS TO AFFECT A GOOD PART OF NORTHEAST IOWA... AT 740 PM THUNDERSTORMS CONTINUED TO AFFECT AREAS EAST OF I-35 WITH THE STRONGEST STORMS 10 MILES SOUTH OF WATERLOO NEAR HUDSON. OTHER STRONG STORMS WERE LOCATED FROM 25 MILES WEST OF DECORAH TO 5 MILES NORTH OF DECORAH. THESE STORMS WERE MOVING EAST AT 25 MPH AND ARE CAPABLE OF PRODUCING HEAVY RAINS...GUSTY WINDS...SMALL HAIL AND DEADLY LIGHTNING. PEOPLE IN THE CITIES OF HUDSON...LAPORTE CITY AND HESPER SHOULD BE PREPARED TO MOVE TO A PLACE OF SHELTER SHOULD SEVERE WEATHER OCCUR. SINCE 715 PM THE STORMS HAVE WEAKENED AND THE THREAT OF SEVERE WEATHER HAS DECREASED BUT STILL EXISTS. THE ONLY REPORT OF SEVERE WEATHER TONIGHT WAS A 90 MPH WIND GUST AT CONRAD IN GRUNDY COUNTY AT 710 PM. REMEMBER A TORNADO WATCH REMAINS IN EFFECT UNTIL 10 PM. SHOULD SEVERE WEATHER APPROACH OR A WARNING BE ISSUED BE SURE TO SEEK IMMEDIATE SHELTER AND MONITOR NOAA WEATHER RADIO...COMMERCIAL TV OR RADIO. COLLAR
Special weather statement, Jul 27, 7:52 PM CDT, 1 hour 52 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-280230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 750 PM CDT TUE JUL 27 1993 ...THUNDERSTORMS TO AFFECT A GOOD PART OF NORTHEAST IOWA... AT 740 PM THUNDERSTORMS CONTINUED TO AFFECT AREAS EAST OF I-35 WITH THE STRONGEST STORMS 10 MILES SOUTH OF WATERLOO NEAR HUDSON. OTHER STRONG STORMS WERE LOCATED FROM 25 MILES WEST OF DECORAH TO 5 MILES NORTH OF DECORAH. THESE STORMS WERE MOVING EAST AT 25 MPH AND ARE CAPABLE OF PRODUCING HEAVY RAINS...GUSTY WINDS...SMALL HAIL AND DEADLY LIGHTNING. PEOPLE IN THE CITIES OF HUDSON...LAPORTE CITY AND HESPER SHOULD BE PREPARED TO MOVE TO A PLACE OF SHELTER SHOULD SEVERE WEATHER OCCUR. SINCE 715 PM THE STORMS HAVE WEAKENED AND THE THREAT OF SEVERE WEATHER HAS DECREASED BUT STILL EXISTS. THE ONLY REPORT OF SEVERE WEATHER TONIGHT WAS A 90 MPH WIND GUST AT CONRAD IN GRUNDY COUNTY AT 710 PM. REMEMBER A TORNADO WATCH REMAINS IN EFFECT UNTIL 10 PM. SHOULD SEVERE WEATHER APPROACH OR A WARNING BE ISSUED BE SURE TO SEEK IMMEDIATE SHELTER AND MONITOR NOAA WEATHER RADIO...COMMERCIAL TV OR RADIO. COLLAR
Special weather statement, Jul 27, 9:40 PM CDT, 4 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-280330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 940 PM CDT TUE JUL 27 1993 ...LOOK FOR THE STORMS TO GRADUALLY TAPER OFF... AT 935 PM THUNDERSTORMS CONTINUED MAINLY EAST OF HIGHWAY 63. THE STORM PRODUCING THE HEAVIEST RAIN WAS LOCATED 10 MILES EAST OF WATERLOO BETWEEN RAYMOND AND JESUP. THE STROMS WERE MOVING EAST AT NEAR 40 MPH AND WILL AFFECT JESUP AND INDEPENDENCE THROUGH 1015 PM. OTHER SHOWERS AND STORMS ARE GOING TO BECOME CONFINED TO AREAS EAST OF HIGHWAY 150 BY 1030 PM. THE REST OF NORTHEAST IOWA CAN EXPECT SLOWLY CLEARING SKIES INTO MIDNIGHT. THE TORNADO WATCH HAS BEEN CANCELLED AS THE THREAT OF SEVERE WEATHER HAS DIMINISHED. COLLAR
Special weather statement, Jul 27, 9:42 PM CDT, 2 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-280330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 940 PM CDT TUE JUL 27 1993 ...LOOK FOR THE STORMS TO GRADUALLY TAPER OFF... AT 935 PM THUNDERSTORMS CONTINUED MAINLY EAST OF HIGHWAY 63. THE STORM PRODUCING THE HEAVIEST RAIN WAS LOCATED 10 MILES EAST OF WATERLOO BETWEEN RAYMOND AND JESUP. THE STROMS WERE MOVING EAST AT NEAR 40 MPH AND WILL AFFECT JESUP AND INDEPENDENCE THROUGH 1015 PM. OTHER SHOWERS AND STORMS ARE GOING TO BECOME CONFINED TO AREAS EAST OF HIGHWAY 150 BY 1030 PM. THE REST OF NORTHEAST IOWA CAN EXPECT SLOWLY CLEARING SKIES INTO MIDNIGHT. THE TORNADO WATCH HAS BEEN CANCELLED AS. THE THREAT OF SEVERE WEATHER HAS DIMINISHED. COLLAR
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 7:10 PM CDT | Severe Thunderstorm Warning | DMX | Grundy | 17 min |
| Jul 27, 7:14 PM CDT | Severe Thunderstorm Warning | DMX | Marshall | 21 min |
| Jul 27, 7:14 PM CDT | Severe Thunderstorm Warning | DMX | Tama | 31 min |
| Jul 27, 7:44 PM CDT | Severe Thunderstorm Warning | DMX | Benton | 31 min |
| Jul 27, 8:08 PM CDT | Severe Thunderstorm Warning | DMX | Linn | 37 min |
| Jul 27, 8:10 PM CDT | Severe Thunderstorm Warning | DMX | Buchanan | 35 min |
| Jul 27, 9:18 PM CDT | Severe Thunderstorm Warning | DMX | Benton, Iowa | 27 min |
| Jul 27, 9:50 PM CDT | Flash Flood Warning | DMX | Benton | 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.