Alert archive / Iowa / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 101, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Jul 23, 1997, 4:56 AM CDT for Fremont County, Iowa; Otoe County, Nebraska. It was in force for 49 min. 2 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
- Jul 23, 1997, 4:56 AM CDT (09:56 UTC)
- Expired
- Jul 23, 1997, 5:45 AM CDT
- In force
- 49 min
- Issued by
- NWS Omaha, NE
- Area
- Whole counties
Counties Fremont County, IA, Otoe County, NE
The radar
The Omaha radar (KOAX), 81 km from the middle of the area, began a volume at 09:56 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 |
|---|---|---|---|
| Jul 23, 5:15 AM CDT | Thunderstorm Wind 52 | Nebraska City, NE | |
| Jul 23, 5:30 AM CDT | Thunderstorm Wind 52 | Hamburg, 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 00:00Z, 9.9 hours before the alert went out and 81 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
- 1353 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 1400 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 148 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KOMA 230957 RRA SVROMA IAC071-NEC131-231045- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 456 AM CDT WED JUL 23 1997 * SEVERE THUNDERSTORM WARNING FOR EASTERN OTOE COUNTY - IN SOUTHEASTERN NEBRASKA FREMONT COUNTY - IN SOUTHWESTERN IOWA * UNTIL 545 AM CDT * SOME LOCATIONS AFFECTED ANDERSON BY AROUND 455 AM CDT SIDNEY BY AROUND 455 AM CDT RIVERTON BY AROUND 515 AM CDT HAMBURG BY AROUND 515 AM CDT FARRAGUT BY AROUND 520 AM CDT * AT 455 AM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER RADAR 36 MILES SOUTH OF DOWNTOWN OMAHA OR 8 MILES WEST OF SIDNEY MOVING SOUTHEAST AT 25 MPH. THIS SEVERE THUNDERSTORM MAY PRODUCE LARGE HAIL...GREATER THAN 3/4 INCH IN DIAMETER AND DESTRUCTIVE WINDS OF OVER 60 MPH. GET INTO A SAFE BUILDING...AWAY FROM WINDOWS OR GLASS DOORS. SKERRITT
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 8:07 AM CDT | Severe Thunderstorm Warning | OAX | Shelby | 63 min |
| Jul 23, 4:16 AM CDT | Severe Thunderstorm Warning | OAX | Cass, Sarpy | 44 min |
| Jul 23, 5:42 AM CDT | Severe Thunderstorm Warning | OAX | Nemaha | 48 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1997Severe Thunderstorm Warnings in Nebraska, 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.