Alert archive / Iowa / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 13, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at May 7, 1997, 3:36 PM CDT for Shelby County, Iowa. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 7, 1997, 3:36 PM CDT (20:36 UTC)
- Expired
- May 7, 1997, 4:40 PM CDT
- In force
- 64 min
- Issued by
- NWS Omaha, NE
- Area
- Whole counties
County Shelby County, IA
The radar
The Omaha radar (KOAX), 97 km from the middle of the area, began a volume at 20:36 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 7, 2:00 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 8.6 hours before the alert went out and 97 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 963 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 202 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.1
The text
As transmitted, in the capitals the NWS used until 2016.
901 WUUS1 KOMA 072037 RRA SVROMA IAC165-072140- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 336 PM CDT WED MAY 7 1997 * SEVERE THUNDERSTORM WARNING FOR SHELBY COUNTY - IN SOUTHWESTERN IOWA * UNTIL 440 PM CDT * SOME LOCATIONS AFFECTED EARLING NOW WESTPHALIA NOW CORLEY BY AROUND 345 PM CDT HARLAN BY AROUND 345 PM CDT IRWIN BY AROUND 355 PM CDT JACKSONVILLE BY AROUND 400 PM CDT BOTNA BY AROUND 405 PM CDT ELK HORN BY AROUND 410 PM CDT * AT 335 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER RADAR 37 MILES NORTHEAST OF DOWNTOWN OMAHA OR 5 MILES WEST SOUTHWEST OF WESTPHALIA MOVING EAST AT 30 MPH. PEOPLE IN THE WARNED AREA SHOULD GET INTO A REINFORCED SHELTER AND PREPARE FOR DAMAGING WINDS...LARGE HAIL...VERY HEAVY RAIN...AND DANGEROUS LIGHTNING. BYRD
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, May 7, 10:52 AM CDT, 4 hours 44 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-081200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1055 AM CDT WED MAY 7 1997 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION MAY BE REQUIRED INTO THIS EVENING OVER EASTERN NEBRASKA AND WESTERN IOWA. DISCUSSION... THUNDERSTORMS DEVELOPING OVER NORTHEAST NEBRASKA COULD POSSIBLY BECOME SEVERE EARLY THIS AFTERNOON OVER PARTS OF EAST CENTRAL NEBRASKA AND WEST CENTRAL IOWA. THESE STORMS WERE NORTH OF A WARM FRONT THAT WAS ALONG THE PLATTE RIVER. OTHER THUNDERSTORM DEVELOPMENT...INCLUDING SOME POSSIBLY SEVERE...COULD DEVELOP OR MOVE INTO SOUTHEAST NEBRASKA AND SOUTHWEST IOWA LATER THIS AFTERNOON AS A COLD FRONT ENTERS THE AREA. THE MAIN THREAT FROM THESE STORMS ARE GUSTY WINDS AND HAIL...ALTHOUGH SUPERCELL DEVELOPMENT AND A POSSIBLE TORNADO CAN/T PBE RULED OUT. CHERMOK
Special weather statement, May 7, 10:55 AM CDT, 4 hours 41 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-081200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1055 AM CDT WED MAY 7 1997 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION MAY BE REQUIRED INTO THIS EVENING OVER EASTERN NEBRASKA AND WESTERN IOWA. DISCUSSION... THUNDERSTORMS DEVELOPING OVER NORTHEAST NEBRASKA COULD POSSIBLY BECOME SEVERE EARLY THIS AFTERNOON OVER PARTS OF EAST CENTRAL NEBRASKA AND WEST CENTRAL IOWA. THESE STORMS WERE NORTH OF A WARM FRONT THAT WAS ALONG THE PLATTE RIVER. OTHER THUNDERSTORM DEVELOPMENT...INCLUDING SOME POSSIBLY SEVERE...COULD DEVELOP OR MOVE INTO SOUTHEAST NEBRASKA AND SOUTHWEST IOWA LATER THIS AFTERNOON AS A COLD FRONT ENTERS THE AREA. THE MAIN THREAT FROM THESE STORMS ARE GUSTY WINDS AND HAIL...ALTHOUGH SUPERCELL DEVELOPMENT AND A POSSIBLE TORNADO CAN/T BE RULED OUT. CHERMOK
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 3:01 PM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 64 min |
| May 7, 4:16 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Pottawattamie | 64 min |
| May 7, 4:49 PM CDT | Tornado Warning | OAX | Mills | 66 min |
| May 7, 5:58 PM CDT | Severe Thunderstorm Warning | OAX | Montgomery, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.