Alert archive / Iowa / Severe Thunderstorm Warnings in 1996
Severe Thunderstorm Warning 69, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 20, 1996, 5:11 PM CDT for Crawford County, Iowa. It was in force for 34 min. 4 reports 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
- Jun 20, 1996, 5:11 PM CDT (22:11 UTC)
- Expired
- Jun 20, 1996, 5:45 PM CDT
- In force
- 34 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Crawford County, IA
The radar
The Omaha radar (KOAX), 114 km from the middle of the area, began a volume at 22:12 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 20, 5:16 PM CDT | Hail 0.75 | Denison, IA | |
| Jun 20, 5:23 PM CDT | Hail 1 | Deloit, IA | |
| Jun 20, 5:41 PM CDT | Thunderstorm Wind 50 | Schleswig, IA | |
| Jun 20, 5:45 PM CDT | Hail 1.25 | Schleswig, 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.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 10.2 hours before the alert went out and 114 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
- 2885 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 717 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 147 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 10.7
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDSM 202211
SVRDSM
IAC047-202245-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
511 PM CDT THU JUN 20 1996
* SEVERE THUNDERSTORM WARNING FOR
EASTERN CRAWFORD COUNTY - WEST CENTRAL IOWA
* UNTIL 545 PM CDT
* SOME LOCATIONS AFFECTED
DELOIT
VAIL
WESTSIDE
* AT 509 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM JUST WEST OF
DELOIT OR 55 MILES SOUTHEAST OF SIOUX CITY MOVING SOUTHEAST AT 25
MPH.
* THE STORM WILL BE NEAR VAIL AT 520 PM CDT.
THIS IS A DANGEROUS STORM. DO NOT GO OUTDOORS.
STARKWhat 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
Local storm report, Jun 20, 12:40 PM CDT, 4 hours 31 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA 1225 AM CST THU JUN 20 1996
TIME(CDT) .....CITY LOCATION..... ST ...EVENT/REMARKS...
DATE(CDT) ....COUNTY LOCATION....
1147 PM NORTH OF ODEBOLT IA 1.75 INCH HAIL 6/19/96 SAC 1247 AM NORTH OF ODEBOLT IA 1.75 INCH HAIL 6/20/96 SAC 0118 AM DENISON IA 1.75 INCH HAIL 6/20/96 CRAWFORD 0140 AM 6 N DENISON IA .75 INCH HAIL 6/20/96 CRAWFORD 0222 AM 10 NE AUDUBON IA 70 MPH WIND GUST
6/20/96 AUDUBON 0247 AM 10 NE AUDUBON IA WIND DAMAGE LARGE TREES 6/20/96 AUDUBON DAMAGED 0941 AM 10 SW AUDUBON IA WIND DAMAGE LARGE TREES 6/20/96 AUDUBON DOWN 0945 AM AUDUBON IA WIND DAMAGE POWER LINES 6/20/96 AUDUBON DOWN 1010 AM 5 NE GUTHRIE CENTER IA .75 INCH HAIL 6/20/96 GUTHRIE 1015 AM STUART IA WIND DAMAGE LARGE TREES 6/20/96 GUTHRIE DOWN AND CAR DAMAGE 1056 AM CRESTON IA 59 MPH WIND GUST 6/20/96 UNION
Local storm report, Jun 20, 12:40 PM CDT, 4 hours 31 minutes before
PRELIMINARY LOCAL STORM REPORT...CORRECTED TIME NATIONAL WEATHER SERVICE DES MOINES IA 1240 PM CST THU JUN 20 1996 TIME(CDT) .....CITY LOCATION..... ST ...EVENT/REMARKS... DATE(CDT) ....COUNTY LOCATION.... 1147 PM NORTH OF ODEBOLT IA 1.75 INCH HAIL 6/19/96 SAC 1247 AM NORTH OF ODEBOLT IA 1.75 INCH HAIL 6/20/96 SAC 0118 AM DENISON IA 1.75 INCH HAIL 6/20/96 CRAWFORD 0140 AM 6 N DENISON IA .75 INCH HAIL 6/20/96 CRAWFORD 0222 AM 10 NE AUDUBON IA 70 MPH WIND GUST 6/20/96 AUDUBON 0247 AM 10 NE AUDUBON IA WIND DAMAGE LARGE TREES 6/20/96 AUDUBON DAMAGED 0941 AM 10 SW AUDUBON IA WIND DAMAGE LARGE TREES 6/20/96 AUDUBON DOWN 0945 AM AUDUBON IA WIND DAMAGE POWER LINES 6/20/96 AUDUBON DOWN 1010 AM 5 NE GUTHRIE CENTER IA .75 INCH HAIL 6/20/96 GUTHRIE 1015 AM STUART IA WIND DAMAGE LARGE TREES 6/20/96 GUTHRIE DOWN AND CAR DAMAGE 1056 AM CRESTON IA 59 MPH WIND GUST 6/20/96 UNION JOHNSON
Local storm report, Jun 20, 12:43 PM CDT, 4 hours 28 minutes before
PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE DES MOINES IA 1243 PM CST THU JUN 20 1996 TIME(CDT) .....CITY LOCATION..... ST ...EVENT/REMARKS... DATE(CDT) ....COUNTY LOCATION.... 1230 AM SCHALLER IA 1.75 INCH HAIL 6/20/96 SAC 0230 AM 10 NE AUDUBON IA NUMEROUS LARGE TREES DOWN 6/20/96 AUDONBON JOHNSON
Special weather statement, Jun 20, 2:54 PM CDT, 2 hours 17 minutes before
IAZ004>006-015-016-023>025-033>036-044>048-057>060-070>073-081>083- 092>094-202230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 255 PM CDT THU JUN 20 1996 HAZARD...SCATTERED SEVERE THUNDERSTORMS CAPABLE OF PRODUCING WIND GUSTS TO 75 MPH...HAIL ONE INCH IN DIAMETER...AND ISOLATED RAINFALL AMOUNTS OF 2 TO 3 INCHES. AREA OF CONCERN...WESTERN HALF OF IOWA...ALONG AND WEST OF A LAMONI TO DES MOINES TO LAKE MILLS LINE. TIMING DETAILS...LATE THIS AFTERNOON ACROSS FAR NORTHWEST IOWA AND THIS EVENING AND TONIGHT OVER CENTRAL AND NORTHERN IOWA. METEOROLOGICAL COMMENTS...A STATIONARY FRONT LOCATED ACROSS NORTHEAST THROUGH SOUTHWEST IOWA WILL CONTINUE TO BE THE FOCUS FOR ADDITIONAL THUNDERSTORM DEVELOPMENT LATE THIS AFTERNOON INTO TONIGHT. AN UPPER LEVEL DISTURBANCE IS FORECAST TO PUSH OUT OF THE ROCKIES AND INTO THE PLAINS LATE THIS AFTERNOON AND INTERACT WITH AN EXTREMELY UNSTABLE AIRMASS ACROSS EASTERN NEBRASKA. THUNDERSTORMS WERE ALREADY OCCURRING OVER PARTS OF NORTHEAST NEBRASKA INTO NORTHWEST IOWA AND FURTHER DEVELOPMENT IS ANTICIPATED LATER THIS AFTERNOON AS THE UPPER LEVEL DISTURBANCE MOVES EAST. LOW LEVEL WIND PROFILES ACROSS WESTERN IOWA ARE EXPECTED TO BECOME MORE FAVORABLE FOR SUPERCELL DEVELOPMENT LATE THIS AFTERNOON INTO THIS EVENING AS THE DISTURBANCE INTERACTS WITH THE STATIONARY FRONTAL SYSTEM LYING ACROSS THE STATE. LATEST VISIBLE SATELLITE PICTURES INDICATE SKIES WERE CLEARING ACROSS PARTS OF SOUTHWEST IOWA WHICH WILL ALLOW THE ATMOSPHERE TO DESTABILIZE EVEN FURTHER LATER THIS AFTERNOON. LIFTED INDICES ACROSS EASTERN NEBRASKA WERE ALREADY RANGING FROM -10 TO -15 INDICATING EXTREME INSTABILITY PRESENT IN THIS AREA. THUNDERSTORMS WILL INTENSIFY ACROSS NORTHWEST IOWA LATE THIS AFTERNOON WITH ADDITIONAL DEVELOPMENT EXPECTED FURTHER SOUTH INTO FAR WEST AND SOUTHWEST IOWA BY THIS EVENING. IN ADDITION TO THE THREAT FOR LARGE HAIL AND ISOLATED TORNADOES...THERE ALSO EXISTS THE REAL THREAT OF ADDITIONAL HEAVY RAINFALL...ESPECIALLY ACROSS THE NORTHWEST HALF OF THE STATE. PRESENT INDICATIONS SUGGEST THE POTENTIAL FOR UP TO 3 INCHES OF RAIN ACROSS EXTREME NORTHERN IOWA LATER TONIGHT INTO FRIDAY MORNING. FURTHER SOUTH...RAINFALL AMOUNTS WILL RANGE FROM ONE HALF TO ONE INCH WHICH WILL FURTHER AGGRAVATE THE ALREADY SATURATED SOIL CONDITIONS. PRECAUTIONS...SPOTTER ACTIVATION IS LIKELY LATER THIS AFTERNOON INTO TONIGHT. EMERGENCY MANAGERS AND WATER RESOURCE PERSONNEL SHOULD KEEP ABREAST OF THE SITUATION. SMITH
Special weather statement, Jun 20, 2:57 PM CDT, 2 hours 14 minutes before
IAZ004>006-015-016-023>025-033>036-044>048-057>060-070>073-081>083- 092>094-202230- CENTRAL IOWA THUNDERSTORM OUTLOOK...CORRECTION NATIONAL WEATHER SERVICE DES MOINES IA 255 PM CDT THU JUN 20 1996 HAZARD...SCATTERED SEVERE THUNDERSTORMS CAPABLE OF PRODUCING WIND GUSTS TO 75 MPH...HAIL ONE INCH IN DIAMETER...AND ISOLATED RAINFALL AMOUNTS OF 2 TO 3 INCHES. AREA OF CONCERN...WESTERN HALF OF IOWA...ALONG AND WEST OF A LAMONI TO DES MOINES TO LAKE MILLS LINE. TIMING DETAILS...LATE THIS AFTERNOON ACROSS FAR NORTHWEST IOWA AND THIS EVENING AND TONIGHT OVER CENTRAL AND NORTHERN IOWA. METEOROLOGICAL COMMENTS...A STATIONARY FRONT LOCATED ACROSS NORTHEAST THROUGH SOUTHWEST IOWA WILL CONTINUE TO BE THE FOCUS FOR ADDITIONAL THUNDERSTORM DEVELOPMENT LATE THIS AFTERNOON INTO TONIGHT. AN UPPER LEVEL DISTURBANCE IS FORECAST TO PUSH OUT OF THE ROCKIES AND INTO THE PLAINS LATE THIS AFTERNOON AND INTERACT WITH AN EXTREMELY UNSTABLE AIRMASS ACROSS EASTERN NEBRASKA. THUNDERSTORMS WERE ALREADY OCCURRING OVER PARTS OF NORTHEAST NEBRASKA INTO NORTHWEST IOWA AND FURTHER DEVELOPMENT IS ANTICIPATED LATER THIS AFTERNOON AS THE UPPER LEVEL DISTURBANCE MOVES EAST. LOW LEVEL WIND PROFILES ACROSS WESTERN IOWA ARE EXPECTED TO BECOME MORE FAVORABLE FOR SUPERCELL DEVELOPMENT LATE THIS AFTERNOON INTO THIS EVENING AS THE DISTURBANCE INTERACTS WITH THE STATIONARY FRONTAL SYSTEM LYING ACROSS THE STATE. LATEST VISIBLE SATELLITE PICTURES INDICATE SKIES WERE CLEARING ACROSS PARTS OF SOUTHWEST IOWA WHICH WILL ALLOW THE ATMOSPHERE TO DESTABILIZE EVEN FURTHER LATER THIS AFTERNOON. LIFTED INDICES ACROSS EASTERN NEBRASKA WERE ALREADY RANGING FROM -10 TO -15 INDICATING EXTREME INSTABILITY PRESENT IN THIS AREA. THUNDERSTORMS WILL INTENSIFY ACROSS NORTHWEST IOWA LATE THIS AFTERNOON WITH ADDITIONAL DEVELOPMENT EXPECTED FURTHER SOUTH INTO FAR WEST AND SOUTHWEST IOWA BY THIS EVENING. IN ADDITION TO THE THREAT FOR LARGE HAIL AND ISOLATED TORNADOES...THERE ALSO EXISTS THE REAL THREAT OF ADDITIONAL HEAVY RAINFALL...ESPECIALLY ACROSS THE NORTHWEST HALF OF THE STATE. PRESENT INDICATIONS SUGGEST THE POTENTIAL FOR UP TO 3 INCHES OF RAIN ACROSS EXTREME NORTHERN IOWA LATER TONIGHT INTO FRIDAY MORNING. FURTHER SOUTH...RAINFALL AMOUNTS WILL RANGE FROM ONE HALF TO ONE INCH WHICH WILL FURTHER AGGRAVATE THE ALREADY SATURATED SOIL CONDITIONS. PRECAUTIONS...SPOTTER ACTIVATION IS LIKELY LATER THIS AFTERNOON INTO TONIGHT. EMERGENCY MANAGERS AND WATER RESOURCE PERSONNEL SHOULD KEEP ABREAST OF THE SITUATION. SMITH
Special weather statement, Jun 20, 4:04 PM CDT, 1 hour 7 minutes before
IAZ004>006-015-016-023>025-033>036-044>048-057>060-070>073-081>083- 092>094-202230- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 410 PM CDT THU JUN 20 1996 HAZARD...SCATTERED SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DOWNBURST WIND GUSTS TO 75 MPH...ISOLATED TORNADOES...HAIL ONE INCH IN DIAMETER...AND ISOLATED RAINFALL AMOUNTS OF 2 TO 3 INCHES. AREA OF CONCERN...NORTHWEST THIRD OF IOWA THIS EVENING...NORTHWEST OF AN ALGONA TO DENISON LINE. OVER WESTERN AND NORTHERN IOWA LATE THIS EVENING AND TONIGHT...ALONG AND WEST OF A LAMONI TO DES MOINES TO LAKE MILLS LINE. TIMING DETAILS...THIS EVENING ACROSS NORTHWEST IOWA AND OVERNIGHT FOR CENTRAL AND NORTHERN IOWA. METEOROLOGICAL COMMENTS...A STATIONARY FRONT LOCATED ACROSS NORTHEAST THROUGH SOUTHWEST IOWA WILL CONTINUE TO BE THE FOCUS FOR ADDITIONAL THUNDERSTORM DEVELOPMENT LATE THIS AFTERNOON INTO TONIGHT. AN UPPER LEVEL DISTURBANCE IS FORECAST TO PUSH OUT OF THE ROCKIES AND INTO THE PLAINS LATE THIS AFTERNOON AND INTERACT WITH AN EXTREMELY UNSTABLE AIRMASS ACROSS EASTERN NEBRASKA. THUNDERSTORMS WERE ALREADY OCCURRING OVER PARTS OF NORTHEAST NEBRASKA INTO NORTHWEST IOWA AND FURTHER DEVELOPMENT IS ANTICIPATED LATER THIS AFTERNOON AS THE UPPER LEVEL DISTURBANCE MOVES EAST. LOW LEVEL WIND PROFILES ACROSS WESTERN IOWA ARE EXPECTED TO BECOME MORE FAVORABLE FOR SUPERCELL DEVELOPMENT LATE THIS AFTERNOON INTO THIS EVENING AS THE DISTURBANCE INTERACTS WITH THE STATIONARY FRONTAL SYSTEM LYING ACROSS THE STATE. LATEST VISIBLE SATELLITE PICTURES INDICATE SKIES CONTINUING TO CLEAR OVER PARTS OF SOUTHWEST AND CENTRAL IOWA WHICH WILL ALLOW THE ATMOSPHERE TO DESTABILIZE EVEN FURTHER THIS EVENING. LIFTED INDICES ACROSS EASTERN NEBRASKA WERE ALREADY RANGING FROM -10 TO -15 INDICATING EXTREME INSTABILITY PRESENT IN THIS AREA. STRONG THUNDERSTORMS ALREADY OCCURRING OVER NORTHWEST IOWA WILL CONTINUE TO PUSH EASTWARD THIS EVENING WHILE ADDITIONAL STORM DEVELOPMENT IS EXPECTED FURTHER SOUTH INTO FAR WEST AND SOUTHWEST IOWA THIS EVENING. IN ADDITION TO THE THREAT FOR LARGE HAIL AND ISOLATED TORNADOES...THERE ALSO EXISTS THE THREAT OF ADDITIONAL HEAVY RAINFALL...ESPECIALLY ACROSS THE NORTHWEST HALF OF THE STATE. PRESENT INDICATIONS SUGGEST THE POTENTIAL FOR UP TO 3 INCHES OF RAIN ACROSS EXTREME NORTHERN IOWA LATER TONIGHT INTO FRIDAY MORNING. FURTHER SOUTH...RAINFALL AMOUNTS WILL RANGE FROM ONE HALF TO ONE INCH WHICH WILL FURTHER AGGRAVATE THE ALREADY SATURATED SOIL CONDITIONS. PRECAUTIONS...SPOTTER ACTIVATION IS LIKELY THIS EVENING AND TONIGHT. EMERGENCY MANAGERS AND WATER RESOURCE PERSONNEL SHOULD KEEP ABREAST OF THE SITUATION. SMITH
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 11:44 PM CDT | Severe Thunderstorm Warning | DMX | Sac | 31 min |
| Jun 20, 12:39 AM CDT | Severe Thunderstorm Warning | DMX | Sac | 21 min |
| Jun 20, 1:00 AM CDT | Severe Thunderstorm Warning | DMX | Crawford | 25 min |
| Jun 20, 1:16 AM CDT | Flash Flood Warning | DMX | Sac | 3 hr |
| Jun 20, 1:23 AM CDT | Severe Thunderstorm Warning | DMX | Crawford | 32 min |
| Jun 20, 9:25 AM CDT | Severe Thunderstorm Warning | DMX | Audubon, Cass | 30 min |
| Jun 20, 9:49 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Guthrie | 41 min |
| Jun 20, 10:16 AM CDT | Severe Thunderstorm Warning | DMX | Dallas, Madison | 44 min |
| Jun 20, 10:36 AM CDT | Severe Thunderstorm Warning | DMX | Polk, Warren | 39 min |
| Jun 20, 10:51 AM CDT | Severe Thunderstorm Warning | DMX | Madison, Union | 29 min |
| Jun 20, 1:18 PM CDT | Flash Flood Warning | DMX | Audubon | 3 hr |
| Jun 20, 4:23 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 37 min |
| Jun 20, 5:32 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 43 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1996Every severe thunderstorm warning in 1996
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; radar from the NEXRAD Level II archive.