Alert archive / Iowa / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 63, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Jun 29, 1997, 4:01 PM CDT for Harrison County, Iowa. It was in force for 44 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
- Jun 29, 1997, 4:01 PM CDT (21:01 UTC)
- Expired
- Jun 29, 1997, 4:45 PM CDT
- In force
- 44 min
- Issued by
- NWS Omaha, NE
- Area
- Whole counties
County Harrison County, IA
The radar
The Omaha radar (KOAX), 61 km from the middle of the area, began a volume at 21:05 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 29, 4:39 PM CDT | Thunderstorm Wind 54 | Logan, 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, 9.0 hours before the alert went out and 61 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
- 1803 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 732 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 42 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, Jun 29, 11:35 AM CDT, 4 hours 26 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-301200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1135 AM CDT SUN JUN 29 1997 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION MAY BE NEEDED LATE THIS AFTERNOON AND TONIGHT ACROSS EASTERN NEBRASKA AND SOUTHWEST IOWA. DISCUSSION... A WARM AND UNSTABLE AIRMASS CONTINUED TO COVER EASTERN NEBRASKA AND SOUTHWEST IOWA. SEVERAL WEAK BOUNDARIES FROM EARLIER SHOWERS AND THUNDERSTORMS COMBINED WITH AN UPPER LEVEL DISTURBANCE COULD TRIGGER REDEVELOPMENT OF THUNDERSTORMS JUST ABOUT ANYWHERE ACROSS THE AREA LATER THIS AFTERNOON. IN ADDITION...LOW PRESSURE EXPECTED TO DEEPEN OVER WESTERN SOUTH DAKOTA TONIGHT WILL INCREASE LOW LEVEL SOUTH WINDS ACROSS THE CENTRAL PLAINS. THIS WOULD FEED MOIST AND UNSTABLE AIR INTO ANY THUNDERSTORMS THAT DEVELOP WEST OF THE AREA THIS AFTERNOON ...POSSIBLY CAUSING THE THUNDERSTORMS TO BECOME MORE WIDESPREAD TONIGHT AS THEY MOVED EAST. THE PRIMARY THREAT FROM THE THUNDERSTORMS IS HEAVY RAIN AND DAMAGING WINDS. HOWEVER...SOME OF THE STRONGER STORMS COULD PRODUCE LARGE HAIL ...ESPECIALLY FROM LATE AFTERNOON THROUGH LATE EVENING. CHERMOK
Special weather statement, Jun 29, 11:41 AM CDT, 4 hours 20 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-301200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1135 AM CDT SUN JUN 29 1997 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION MAY BE NEEDED LATE THIS AFTERNOON AND TONIGHT ACROSS EASTERN NEBRASKA AND SOUTHWEST IOWA. DISCUSSION... A WARM AND UNSTABLE AIRMASS CONTINUED TO COVER EASTERN NEBRASKA AND SOUTHWEST IOWA. SEVERAL WEAK BOUNDARIES FROM EARLIER SHOWERS AND THUNDERSTORMS COMBINED WITH AN UPPER LEVEL DISTURBANCE COULD TRIGGER REDEVELOPMENT OF THUNDERSTORMS JUST ABOUT ANYWHERE ACROSS THE AREA LATER THIS AFTERNOON. IN ADDITION...LOW PRESSURE EXPECTED TO DEEPEN OVER WESTERN SOUTH DAKOTA TONIGHT WILL INCREASE LOW LEVEL SOUTH WINDS ACROSS THE CENTRAL PLAINS. THIS WOULD FEED MOIST AND UNSTABLE AIR INTO ANY THUNDERSTORMS THAT DEVELOP WEST OF THE AREA THIS AFTERNOON ...POSSIBLY CAUSING THE THUNDERSTORMS TO BECOME MORE WIDESPREAD TONIGHT AS THEY MOVED EAST. THE PRIMARY THREAT FROM THE THUNDERSTORMS IS HEAVY RAIN AND DAMAGING WINDS. HOWEVER...SOME OF THE STRONGER STORMS COULD PRODUCE LARGE HAIL ...ESPECIALLY FROM LATE AFTERNOON THROUGH LATE EVENING. CHERMOK
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 1:58 PM CDT | Severe Thunderstorm Warning | OAX | Madison, Stanton | 62 min |
| Jun 29, 2:30 PM CDT | Flash Flood Warning | OAX | Madison, Stanton | 3 hr |
| Jun 29, 3:14 PM CDT | Severe Thunderstorm Warning | OAX | Dodge | 46 min |
| Jun 29, 3:21 PM CDT | Tornado Warning | OAX | Dodge | 49 min |
| Jun 29, 3:41 PM CDT | Severe Thunderstorm Warning | OAX | Washington | 49 min |
| Jun 29, 4:16 PM CDT | Severe Thunderstorm Warning | OAX | Shelby | 44 min |
| Jun 29, 4:16 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 44 min |
| Jun 29, 4:29 PM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 46 min |
| Jun 29, 4:47 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 33 min |
| Jun 29, 4:58 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 47 min |
| Jun 29, 4:58 PM CDT | Severe Thunderstorm Warning | OAX | Shelby | 47 min |
| Jun 29, 6:38 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Page | 62 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1997Every severe thunderstorm warning in 1997
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.