Alert archive / Iowa / Severe Thunderstorm Warnings in 1992
Severe Thunderstorm Warning 74, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 15, 1992, 9:11 PM CDT for Polk County, Story County, Iowa. It was in force for 49 min.
The area
The counties it named.
The facts
- Issued
- Jul 15, 1992, 9:11 PM CDT (02:11 UTC)
- Expired
- Jul 15, 1992, 10:00 PM CDT
- In force
- 49 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Polk County, IA, Story County, IA
The nearest sounding before it
Omaha, NE (KOVN), launched 00:00Z, 2.2 hours before the alert went out and 245 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
- 1427 J/kg
- Mixed-layer CIN
- -91 J/kg
- Mixed-layer LCL
- 684 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 66 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 4.0
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 15, 8:19 PM CDT, 52 minutes before
IAZ006>011-016>019-026>029-038>040-160200- SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR NORTHEAST IOWA NATIONAL WEATHER SERVICE WATERLOO IA 810 PM CDT WED JUL 15 1992 ...STRONG THUNDERSTORMS WERE IN NORTH CENTRAL AND NORTHEAST IOWA... AT 810 PM THUNDERSTORMS AND SHOWERS WERE MOVING EAST AND SOUTHEAST IN NORTH CENTRAL AND NORTHEAST IOWA AT 30 MILES AN HOUR. THE SHOWERS AND THUNDERSTORMS WERE PRODUCING BRIEF HEAVY RAIN AND VIVID LIGHTNING. BY 910 PM CDT THUNDERSTORMS AND SHOWERS WILL BE IN AND NEAR THE CITIES OF MASON CITY/CHARLES CITY/OSAGE/HAMPTON AND NEW HAMPTON. THE REST OF NORTHEAST IOWA WILL BE MOSTLY CLOUDY WITH TEMPERATURES STARTING TO FALL INTO THE LOW 70S. RR
Special weather statement, Jul 15, 8:28 PM CDT, 43 minutes before
IAZ006>011-016>019-026>029-038>040-160200- SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR NORTHEAST IOWA NATIONAL WEATHER SERVICE WATERLOO IA...CORRECTION 825 PM CDT WED JUL 15 1992 ...THERE IS A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHEAST AND NORTH CENTRAL IOWA... AT 810 PM THUNDERSTORMS AND SHOWERS WERE MOVING EAST AND SOUTHEAST IN NORTH CENTRAL AND NORTHEAST IOWA AT 30 MILES AN HOUR. THE SHOWERS AND THUNDERSTORMS WERE PRODUCING BRIEF HEAVY RAIN AND VIVID LIGHTNING. BY 910 PM CDT THUNDERSTORMS AND SHOWERS WILL BE IN AND NEAR THE CITIES OF MASON CITY/CHARLES CITY/OSAGE/HAMPTON AND NEW HAMPTON. THE REST OF NORTHEAST IOWA WILL BE MOSTLY CLOUDY WITH TEMPERATURES STARTING TO 4FALL INTO THE LOW 70S. RR
Special weather statement, Jul 15, 8:32 PM CDT, 39 minutes before
IAZ006>011-016>019-026>029-038>040-160200- SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR NORTHEAST IOWA NATIONAL WEATHER SERVICE WATERLOO IA...CORRECTION 830 PM CDT WED JUL 15 1992 ...THERE IS A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHEAST IOWA... AT 810 PM THUNDERSTORMS AND SHOWERS WERE MOVING EAST AND SOUTHEAST IN NORTH CENTRAL AND NORTHEAST IOWA AT 30 MILES AN HOUR. THE SHOWERS AND THUNDERSTORMS WERE PRODUCING BRIEF HEAVY RAIN AND VIVID LIGHTNING. BY 910 PM CDT THUNDERSTORMS AND SHOWERS WILL BE IN AND NEAR THE CITIES OF MASON CITY/CHARLES CITY/OSAGE/HAMPTON AND NEW HAMPTON. THE REST OF NORTHEAST IOWA WILL BE MOSTLY CLOUDY WITH TEMPERATURES STARTING TO FALL INTO THE LOW 70S.< RR
Special weather statement, Jul 15, 8:46 PM CDT, 25 minutes before
IAZALL-160245- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 8XX PM CDT WED JUL 15 1992 ...TORNADO WATCH FOR SOUTHWEST AND CENTRAL IOWA UNTIL 10 PM CDT... ...SEVERE THUNDERSTORM WATCH FOR PARTS OF CENTRAL AND EASTERN IOWA UNTIL 1 AM CDT THURSDAY MORNING... AT 831 PM CDT...AN AREA OF SCATTERED VERY STRONG THUNDERSTORMS AND ISOLATED INTENSE THUNDERSTORMS WAS INDICATED OVER THE CENTRAL THIRD OF IOWA. THE AREA WAS 80 MILES WIDE AND WAS CENTERED ALONG A LINE FROM WEBSTER CITY TO LAMONI. THE INTENSE STORMS WERE LOCATED AT LAMONI... 45 MILES NORTHWEST OF DES MOINES EAST OF COON RAPIDS...AND 10 MILES SOUTHEAST OF WEBSTER CITY. PEA TO DIME SIZED HAIL...WIND GUSTS TO 70 MILES AN HOUR...AND VERY HEAVY RAIN WERE REPORTED WITH THESE STORMS. THE STORMS WERE MOVING SOUTHEAST AT 25 MILES AN HOUR. RICHTER/FILLBACH
Special weather statement, Jul 15, 8:47 PM CDT, 24 minutes before
IAZALL-160245- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY...CORRECTION FOR TIME NATIONAL WEATHER SERVICE DES MOINES IA 845 PM CDT WED JUL 15 1992 ...TORNADO WATCH FOR SOUTHWEST AND CENTRAL IOWA UNTIL 10 PM CDT... ...SEVERE THUNDERSTORM WATCH FOR PARTS OF CENTRAL AND EASTERN IOWA UNTIL 1 AM CDT THURSDAY MORNING... AT 831 PM CDT...AN AREA OF SCATTERED VERY STRONG THUNDERSTORMS AND ISOLATED INTENSE THUNDERSTORMS WAS INDICATED OVER THE CENTRAL THIRD OF IOWA. THE AREA WAS 80 MILES WIDE AND WAS CENTERED ALONG A LINE FROM WEBSTER CITY TO LAMONI. THE INTENSE STORMS WERE LOCATED AT LAMONI... 45 MILES NORTHWEST OF DES MOINES EAST OF COON RAPIDS...AND 10 MILES SOUTHEAST OF WEBSTER CITY. PEA TO DIME SIZED HAIL...WIND GUSTS TO 70 MILES AN HOUR...AND VERY HEAVY RAIN WERE REPORTED WITH THESE STORMS. THE STORMS WERE MOVING SOUTHEAST AT 25 MILES AN HOUR. RICHTER/FILLBACH
Special weather statement, Jul 15, 9:06 PM CDT, 5 minutes before
IAZ006>011-016>019-026>029-038>040-160300- SPECIAL WEATHER STATEMENT AND WEATHER UPDATE FOR NORTHEAST IOWA NATIONAL WEATHER SERVICE WATERLOO IA...CORRECTION 900 PM CDT WED JUL 15 1992 ...THERE IS A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHEAST IOWA... AT 900 PM THUNDERSTORMS AND SHOWERS WERE MOVING SOUTHEAST IN NORTHEAST IOWA AT 30 MILES AN HOUR. THE THUNDERSTORMS WERE PRODUCING BRIEF HEAVY RAIN AND VIVID LIGHTNING. BY 1010 PM CDT THUNPDERSTORMS AND SHOWERS WILL BE IN AND NEAR THE CITIES OF DUMONT/ALLISON/WATERLOO/WAVERLY/NASHUA/DECORAH AND NEW HAMPTON. THE REST OF NORTHEAST IOWA WILL BE MOSTLY CLOUDY WITH THUNDERSTORMS AND SHOWERS BY MIDNIGHT. RR
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 7:05 PM CDT | Tornado Warning | DMX | Webster | 40 min |
| Jul 15, 7:19 PM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Wright | 26 min |
| Jul 15, 7:44 PM CDT | Severe Thunderstorm Warning | DMX | Hamilton | 46 min |
| Jul 15, 8:30 PM CDT | Flash Flood Warning | DMX | Decatur, Ringgold, Taylor, Union | 2 hr |
| Jul 15, 9:05 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Wayne | 40 min |
| Jul 15, 9:14 PM CDT | Severe Thunderstorm Warning | DMX | Lucas, Monroe | 46 min |
| Jul 15, 9:15 PM CDT | Flash Flood Warning | DMX | Boone | 2 hr |
| Jul 15, 9:41 PM CDT | Severe Thunderstorm Warning | DMX | Davis, Van Buren | 49 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1992Every severe thunderstorm warning in 1992
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.