Alert archive / Iowa / Severe Thunderstorm Warnings in 1992
Severe Thunderstorm Warning 84, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 29, 1992, 6:17 PM CDT for Wayne County, Iowa. It was in force for 43 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 29, 1992, 6:17 PM CDT (23:17 UTC)
- Expired
- Jul 29, 1992, 7:00 PM CDT
- In force
- 43 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Wayne County, IA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 29, 6:45 PM CDT | Hail 0.75 | Wayne, IA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Omaha, NE (KOVN), launched 12:00Z, 11.3 hours before the alert went out and 263 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
- 927 J/kg
- Mixed-layer CIN
- -224 J/kg
- Mixed-layer LCL
- 985 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 169 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 292317 SVRDSM IAC185-300000- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 617 PM CDT WED JUL 29 1992 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 700 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTH CENTRAL IOWA ...WAYNE COUNTY AT 615 PM...DES MOINES RADAR INDICATED A SEVERE THUNDERSTORM ON THE DECATUR-WAYNE COUNTY LINE...OR ABOUT 60 MILES SOUTH OF DES MOINES. THE STORM WAS MOVING EAST AT 35 MILES AN HOUR...ALONG HIGHWAY 2 TOWARDS CORYDON. PEOPLE IN THE TOWNS OF CORYDON...ALLERTON...PROMISE CITY AND SEYMOUR WILL BE AFFECTED BY THIS STORM. THE STORM SHOULD ARRIVE IN THE CORYDON AREA BY 640 PM. IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN... AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED. MYERS
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 29, 4:58 PM CDT, 1 hour 19 minutes before
IAZALL-292240- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY...UPDATED NATIONAL WEATHER SERVICE DES MOINES IA 445 PM CDT WED JUL 29 1992 AT 430 PM CDT...ISOLATED VERY STRONG THUNDERSTORMS WERE INDICATED OVER CENTRAL IOWA. THE STORMS WERE LOCATED 30 MILES NORTH OF DES MOINES... JUST EAST OF AMES...AND 45 MILES NORTHEAST OF DES MOINES...NEAR MARSHALLTOWN. THESE STORMS CAN PRODUCE VERY HEAVY RAIN AS WELL AS DANGEROUS LIGHTNING. THE MENTIONED STORMS WERE PART OF AN AREA OF SCATTERED SHOWERS AND THUNDERSTORMS OVER NORTHEAST THROUGH SOUTHWEST IOWA. THE SHOWERS AND STORMS WERE WITHIN A 100 MILE WIDE AREA THAT WAS CENTERED ALONG A LINE FROM 25 MILES NORTHEAST OF WATERLOO TO THE IOWA/MISSOURI BORDER 50 MILES WEST OF LAMONI. THE STORMS AND SHOWERS WERE MOVING EAST AT 45 MILES AN HOUR. RICHTER
Special weather statement, Jul 29, 5:12 PM CDT, 1 hour 5 minutes before
IAZ051-052-084-075-074-062-050-073-292315- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 511 PM CDT WED JUL 29 1992 AT 506 PM...DES MOINES RADAR INDICATED A DEVELOPING LINE OF THUNDERSTORMS WITH INTENSE RAINFALL AND DANGEROUS LIGHTNING. THE LINE EXTENDED FROM 35 MILES WEST OF CEDAR RAPIDS...NEAR VAN HORNE SOUTHWEST THROUGH THE GRINNEL VICINITY TO JUST SOUTH OF INDIANOLA AND WINTERSET. INDIANOLA AND WINTERSET ARE 15 TO 25 MILES SOUTH AND SOUTHWEST OF DES MOINES RESPECTIVELY. PEA TO MARBLE-SIZED HAIL...WINDS OF 40 TO 50 MILES AN HOUR AND INTENSE RAINFALL WILL OCCUR WITH THESE STORMS. RAINFALL AMOUNTS OF 1/2 TO 3/4 OF AN INCH CAN OCCUR IN LESS THAN 30 MINUTES WITH THE MOST INTENSE STORMS. THE STORMS ARE MOVING EAST NEAR 40 MILES AN HOUR. THE STORMS SHOULD EXTENDED FROM A CEDAR RAPIDS...OSKALOOSA TO CHARITON LINE BY 600 PM. MYERS
Special weather statement, Jul 29, 5:47 PM CDT, 30 minutes before
IAZALL-292340- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 545 PM CDT WED JUL 29 1992 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR SOUTEAST IOWA UNTIL MIDNIGHT... AT 525 PM CDT...A LINE OF ISOLATED VERY STRONG THUNDERSTORMS WAS INDICATED OVER EAST CENTRAL...CENTRAL...AND SOUTH CENTRAL IOWA. THE LINE WAS 25 MILES WIDE AND WAS CENTERED FROM 15 MILES WEST OF CEDAR RAPIDS...TO 25 MILES NORTHWEST OF LAMONI...NEAR DIAGONAL. GOLFBALL SIZE HAIL WAS REPORTED WITH A STORM OVER SOUTHERN WARREN COUNTY AT 515 PM. OTHERWISE...PEA TO MARBLE SIZE HAIL...WINDS OF 40 TO 50 MILES AN HOUR...AND INTENSE RAINFALL WILL OCCUR WITH THESE STORMS. RAINFALL AMOUNTS OF 1/2 T`O 3/4 OF AN INCH CAN OCCUR IN LESS THAN 30 MINUTES. RICHTER
Special weather statement, Jul 29, 5:52 PM CDT, 25 minutes before
IAZALL-292340- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 551 PM CDT WED JUL 29 1992 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR SOUTEAST IOWA UNTIL 11 PM... AT 525 PM CDT...A LINE OF ISOLATED VERY STRONG THUNDERSTORMS WAS INDICATED OVER EAST CENTRAL...CENTRAL...AND SOUTH CENTRAL IOWA. THE LINE WAS 25 MILES WIDE AND WAS CENTERED FROM 15 MILES WEST OF CEDAR RAPIDS...TO 25 MILES NORTHWEST OF LAMONI...NEAR DIAGONAL. GOLFBALL SIZE HAIL WAS REPORTED WITH A STORM OVER SOUTHERN WARREN COUNTY AT 515 PM. OTHERWISE...PEA TO MARBLE SIZE HAIL...WINDS OF 40 TO 50 MILES AN HOUR...AND INTENSE RAINFALL WILL OCCUR WITH THESE STORMS. RAINFALL AMOUNTS OF 1/2 TO 3/4 OF AN INCH CAN OCCUR IN LESS THAN 30 MINUTES. RICHTER
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 5:20 PM CDT | Severe Thunderstorm Warning | DMX | Warren | 25 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.