Alert archive / Iowa / Severe Thunderstorm Warnings in 1992
Severe Thunderstorm Warning 96, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Sep 9, 1992, 7:46 AM CDT for Polk County, Iowa. It was in force for 29 min.
The area
The counties it named.
The facts
- Issued
- Sep 9, 1992, 7:46 AM CDT (12:46 UTC)
- Expired
- Sep 9, 1992, 8:15 AM CDT
- In force
- 29 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Polk County, IA
The nearest sounding before it
Omaha, NE (KOVN), launched 12:00Z, 0.8 hours before the alert went out and 236 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
- 100 J/kg
- Mixed-layer CIN
- -263 J/kg
- Mixed-layer LCL
- 558 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 211 m²/s²
- 0-3 km storm-relative helicity
- 274 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.1
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, Sep 9, 4:42 AM CDT, 3 hours 4 minutes before
IAZALL-091045- RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 441 AM CDT WED SEP 9 1992 AT 425 AM CDT...STRONG THUNDERSTORMS WERE INDICATED OVER SOUTHEAST IOWA. THE STORMS WERE LOCATED WITHIN A 20 MILE WIDE AREA CENTERED FROM 20 MILES NORTHWEST OF OTTUMWA NEAR OSKALOOSA TO 20 MILES NORTHEAST OF OTTUMWA NEAR RICHLAND. ANOTHER STRONG STORM WAS LOCATED NEAR KEOSAUQUA. THESE STORMS WILL PRODUCE BRIEF HEAVY RAIN...SMALL HAIL... AND DEADLY LIGHTNING. THESE STORMS WERE PART OF AN AREA OF SCATTERED SHOWERS AND THUNDERSTORMS OVER THE SOUTHEAST HALF OF THE STATE. OTHER SHOWERS AND STORMS WERE OCCURRING OVER WEST CENTRAL AND NORTHWEST IOWA AS WELL. THE SHOWERS AND STORMS WERE MOVING EAST AT 40 MILES AN HOUR. RICHTER
Special weather statement, Sep 9, 4:52 AM CDT, 2 hours 54 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 450 AM CDT WEDNESDAY SEPTEMBER 9 1992 ...OUTBREAK OF SEVERE THUNDERSTORMS AND TORNADOES IS EXPECTED TODAY INTO TONIGHT FROM THE MIDDLE MISSISSIPPI VALLEY INTO THE LOWER GREAT LAKES AREA... THE NATIONAL SEVERE STORMS FORECAST CENTER IN KANSAS CITY MISSOURI IS FORECASTING AN OUTBREAK OF SEVERE THUNDERSTORMS AND TORNADOES TODAY INTO TONIGHT OVER PORTIONS OF THE MIDDLE MISSISSIPPI AND OHIO VALLEYS...AND THE LOWER GREAT LAKES REGION. THE STATES WHICH ARE MOST LIKELY TO EXPERIENCE THE BRUNT OF THE SEVERE THUNDERSTORM ACTIVITY INCLUDE... ...MOST OF MISSOURI AND ILLINOIS... ...EASTERN IOWA... ...SOUTHERN WISCONSIN AND SOUTHERN MICHIGAN... ...NORTHERN AND CENTRAL INDIANA... ...NORTHWEST OHIO... / A STRONG COLD FRONT MOVING EAST ACROSS THE CENTRAL PLAINS INTO THE MID AND UPPER MISSISSIPPI VALLEY TODAY IS EXPECTED TO PRODUCE AN OUTBREAK OF SEVERE THUNDERSTORMS AND TORNADOES ACROSS MUCH OF THE MIDWEST. A VERY STRONG UPPER LEVEL JET STREAM IS FORECAST TO DRIVE THE COLD FRONT EASTWARD ACROSS A MOIST AND UNSTABLE AIRMASS AS LOW LEVEL WINDS BRING MOISTURE NORTHWARD FROM THE GULF OF MEXICO. THE COMBINATION OF WARM SURFACE TEMPERATURES COUPLED WITH THE STRONG UPPER LEVEL WINDS WILL CAUSE EXPLOSIVE THUNDERSTORM DEVELOPMENT BY AFTERNOON AHEAD OF THE COLD FRONT MOVING INTO EASTERN KANSAS..IOWA.. AND MISSOURI. THE THUNDERSTORMS WILL SPREAD RAPIDLY EASTWARD DURING THE AFTERNOON AND EVENING BRINGING A HIGH RISK OF SEVERE WEATHER TO PARTS OF IOWA..MISSOURI..ILLINOIS..INDIANA..SOUTHERN PORTIONS OF WISCONSIN AND MICHIGAN...AND NORTHWEST OHIO. ALSO...A FEW SEVERE THUNDERSTORMS ARE EXPECTED TO AFFECT PARTS OF KANSAS..OKLAHOMA.. SOUTHEAST NEBRASKA..NORTHERN ARKANSAS..AND NORTHERN PORTIONS OF WISCONSIN AND MICHIGAN TODAY. THE COMBINATION OF AN INTENSIFYING LOW PRESSURE SYSTEM...STRONG MID LEVEL WINDS AND A VERY MOIST UNSTABLE AIR MASS AHEAD OF THE COLD FRONT IS EXPECTED TO RESULT IN POTENTIALLY DESTRUCTIVE TORNADOES IN THE HIGH RISK AREA. DAMAGING THUDERSTORM WINDS AND LARGE HAIL ARE ALSO LIKELY WITH THE WIDESPREAD THUNDERSTORM ACTIVITY ACROSS THE MIDWEST. IT IS EMPHASIZED THAT THIS IS A POTENTIALLY DANGEROUS WEATHER SITUATION TODAY INTO TONIGHT FROM MISSOURI AND IOWA INTO THE LOWER GREAT LAKES AREA. ALL PERSONS IN THE THREATENED AREA ARE URGED TO REVIEW SAFETY RULES ...AND LISTEN TO RADIO..TV..OR NOAA WEATHER RADIO FOR LATER STATEMENTS AND POSSIBLE WATCHES OR WARNINGS. THIS IS A POTENTIALLY DANGEROUS WEATHER SITUATION FOR THE AFFECTED AREAS AND SHOULD BE MONITORED CLOSELY. ..LARRY WILSON.. NATIONAL SEVERE STORMS FORECAST CENTER ..BOB CORBETT.. NATIONAL WEATHER SERVICE FORECAST OFFICE...DES MOINES IA
Special weather statement, Sep 9, 5:43 AM CDT, 2 hours 3 minutes before
IAZALL-091145- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 541 AM CDT WED SEP 9 1992 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR A SMALL PART OF SOUTHEAST IOWA UNTIL 11 AM CDT... AT 525 AM CDT...STRONG THUNDERSTORMS WERE INDICATED OVER SOUTHEAST IOWA. THE STORMS WERE LOCATED 20 MILES SOUTHEAST OF OTTUMWA AND 15 MILES SOUTHEAST OF CEDAR RAPIDS NEAR IOWA CITY. ANOTHER STRONG THUNDERSTORM WAS LOCATED IN WEST CENTRAL IOWA NEAR HARLAN. THESE STORMS WILL PRODUCE SMALL HAIL...BRIEF HEAVY RAIN...AND FREQUENT DANGEROUS LIGHTNING. THESE STORMS WERE PART OF AN AREA OF SCATTERED SHOWERS AND THUNDERSTORMS THAT COVERED MOST OF IOWA EXCEPT FOR PARTS OF THE \CENTRAL AND NORTHEAST COUNTIES. THE SHOWERS AND THUNDERSTORMS WERE MOVING EAST AT 40 MILES AN HOUR. RICHTER
Special weather statement, Sep 9, 6:40 AM CDT, 1 hour 6 minutes before
IAZALL-091245- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 639 AM CDT WED SEP 9 1992 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR A SMALL PART OF SOUTHEAST IOWA UNTIL 11 AM CDT... AT 625 AM CDT...STRONG THUNDERSTORMS WERE INDICATED OVER WEST CENTRAL IOWA...45 MILES WEST OF DES MOINES AND MOVING EAST AT 40 MILES AN HOUR. OTHER STRONG THUNDERSTORMS WERE LOCATED 25 MILES NORTHWEST OF OTTUMWA NEAR OSKALOOSA AND 30 MILES NORTHEAST OF OTTUMWA NEAR WASHINGTON. THESE STORMS WILL PRODUCE SMALL HAIL...BRIEF HEAVY RAIN...AND FREQUENT DANGEROUS LIGHTNING. THESE STORMS WERE PART OF AN AREA OF SCATTERED SHOWERS AND THUNDERSTORMS THAT WERE OCCURRING SOUTH OF A LINE EXTENDING FROM SIOUX CITY TO DUBUQUE. THE SHOWERS AND THUNDERSTORMS WERE MOVING EAST AT 40 MILES AN HOUR. RICHTER
Special weather statement, Sep 9, 7:43 AM CDT, 3 minutes before
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</html>The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 9, 7:17 AM CDT | Severe Thunderstorm Warning | DMX | Polk | 28 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.