Alert archive / Iowa / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 21, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Apr 6, 1998, 8:11 PM CDT for Mills County, Iowa; Cass County, Nebraska. It was in force for 49 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
- Apr 6, 1998, 8:11 PM CDT (01:11 UTC)
- Expired
- Apr 6, 1998, 9:00 PM CDT
- In force
- 49 min
- Issued by
- NWS Omaha, NE
- Area
- Whole counties
Counties Mills County, IA, Cass County, NE
The radar
The Omaha radar (KOAX), 56 km from the middle of the area, began a volume at 01:12 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 6, 6:30 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 1.2 hours before the alert went out and 56 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
- 25 J/kg
- Mixed-layer CIN
- -306 J/kg
- Mixed-layer LCL
- 711 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 158 m²/s²
- 0-3 km storm-relative helicity
- 414 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.2
The text
As transmitted, in the capitals the NWS used until 2016.
716 WUUS1 KOMA 070112 RRA SVROMA IAC129-NEC025-067-109-131-070200- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 811 PM CDT MON APR 6 1998 * SEVERE THUNDERSTORM WARNING FOR CASS COUNTY IN SOUTHEASTERN NEBRASKA LANCASTER COUNTY IN SOUTHEASTERN NEBRASKA GAGE COUNTY IN SOUTHEASTERN NEBRASKA WESTERN OTOE COUNTY IN SOUTHEASTERN NEBRASKA WESTERN MILLS COUNTY IN SOUTHWESTERN IOWA * UNTIL 900 PM CDT * SOME LOCATIONS AFFECTED LINCOLN BEATRICE SYRACUSE PLATTSMOUTH EAGLE GLENWOOD * AT 807 PM DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM AROUND BEATRICE TO LINCOLN TO PLATTSMOUTH TO GLENWOOD IOWA. MOVEMENT WAS NORTHEAST AT 20 MPH. TAKE SHELTER IN A REINFORCED BUILDING ON THE LOWEST FLOOR. DRIVERS SHOULD WATCH OUT FOR WATER OVER ROADS...IN UNDERPASSES AND NEAR STREAMS. REPORTS OF SEVERE WEATHER OR DAMAGE CAN BE GIVEN TO A LAW ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER SERVICE. CHERMOK
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 7:05 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Pottawattamie | 60 min |
| Apr 6, 7:32 PM CDT | Tornado Warning | OAX | Mills | 33 min |
| Apr 6, 8:06 PM CDT | Tornado Warning | OAX | Mills, Pottawattamie | 29 min |
| Apr 6, 7:05 PM CDT | Severe Thunderstorm Warning | OAX | Cass, Gage, Lancaster, Otoe | 60 min |
| Apr 6, 8:11 PM CDT | Severe Thunderstorm Warning | OAX | Gage, Lancaster, Otoe | 49 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1998Severe Thunderstorm Warnings in Nebraska, 1998Every severe thunderstorm warning in 1998
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.