Alert archive / Nebraska / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 255, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Jul 6, 1998, 4:30 PM CDT for Cedar County, Nebraska. It was in force for 65 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
- Jul 6, 1998, 4:30 PM CDT (21:30 UTC)
- Expired
- Jul 6, 1998, 5:35 PM CDT
- In force
- 65 min
- Issued by
- NWS Omaha, NE
- Area
- Whole counties
County Cedar County, NE
The radar
The Sioux Falls radar (KFSD), 118 km from the middle of the area, began a volume at 21:29 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 6, 5:05 PM CDT | Thunderstorm Wind 61 | Menominee, NE | |
| Jul 6, 5:10 PM CDT | Thunderstorm Wind 60 | Bow Vly, NE | Roofs damaged. Trees downed. |
| Jul 6, 5:12 PM CDT | Thunderstorm Wind 61 | St Helena, NE | Dog house destroyed. |
| Jul 6, 5:20 PM CDT | Thunderstorm Wind 64 | Randolph, NE | 50 X 80 foot honey storage barn on the west side of Randolph was destroyed. Roof on the Randolph High School was damaged. |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 6, 2:15 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 9.5 hours before the alert went out and 160 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
- 1215 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 979 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- -19 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, Jul 6, 12:01 PM CDT, 4 hours 29 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-071200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1201 PM CDT MON JUL 6 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION WILL LIKELY NEED TO BE ACTIVATED LATER THIS THIS AFTERNOON OVER NORTHEAST NEBRASKA. STORM SPOTTER ACTIVATION MAY BE REQUIRED LATER THIS AFTERNOON AND TONIGHT OVER THE REST OF EASTERN NEBRASKA AND SOUTHWEST IOWA. DISCUSSION... A LOW PRESSURE SYSTEM WAS OVER NORTH-CENTRAL NEBRASKA WITH A WARM FRONT EXTENDING SOUTHEAST INTO SOUTHWEST IOWA. THUNDERSTORMS OVER SOUTH DAKOTA WILL LIKELY DEVELOP SOUTHWARD INTO NORTHEAST NEBRASKA THIS AFTERNOON. THESE WILL CONTINUE TO DEVELOP OVER THE REST OF EASTERN NEBRASKA AND SOUTHWEST IOWA THIS EVENING AND TONIGHT. DUE TO AN EXTREMELY UNSTABLE AIRMASS OVER THE REGION...ANY THUNDERSTORMS THAT DO DEVELOP HAVE THE POTENTIAL TO PRODUCE SEVERE WEATHER INCLUDING TORNADOES. THE OTHER PROBLEM WILL BE THE POTENTIAL FOR HEAVY RAINFALL AND FLOODING. LJH
Special weather statement, Jul 6, 12:01 PM CDT, 4 hours 29 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-071200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1201 PM CDT MON JUL 6 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION WILL LIKELY NEED TO BE ACTIVATED LATER THIS THIS AFTERNOON OVER NORTHEAST NEBRASKA. STORM SPOTTER ACTIVATION MAY BE REQUIRED LATER THIS AFTERNOON AND TONIGHT OVER THE REST OF EASTERN NEBRASKA AND SOUTHWEST IOWA. DISCUSSION... A LOW PRESSURE SYSTEM WAS OVER NORTH-CENTRAL NEBRASKA WITH A WARM FRONT EXTENDING SOUTHEAST INTO SOUTHWEST IOWA. THUNDERSTORMS OVER SOUTH DAKOTA WILL LIKELY DEVELOP SOUTHWARD INTO NORTHEAST NEBRASKA THIS AFTERNOON. THESE WILL CONTINUE TO DEVELOP OVER THE REST OF EASTERN NEBRASKA AND SOUTHWEST IOWA THIS EVENING AND TONIGHT. DUE TO AN EXTREMELY UNSTABLE AIRMASS OVER THE REGION...ANY THUNDERSTORMS THAT DO DEVELOP HAVE THE POTENTIAL TO PRODUCE SEVERE WEATHER INCLUDING TORNADOES. THE OTHER PROBLEM WILL BE THE POTENTIAL FOR HEAVY RAINFALL AND FLOODING. LJH
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 10:20 PM CDT | Severe Thunderstorm Warning | OAX | Knox | 60 min |
| Jul 5, 10:28 PM CDT | Flash Flood Warning | OAX | Washington | 6 hr |
| Jul 5, 11:20 PM CDT | Severe Thunderstorm Warning | OAX | Knox | 45 min |
| Jul 5, 11:32 PM CDT | Severe Thunderstorm Warning | OAX | Antelope | 48 min |
| Jul 6, 3:51 PM CDT | Severe Thunderstorm Warning | OAX | Knox | 64 min |
| Jul 6, 4:27 PM CDT | Severe Thunderstorm Warning | OAX | Antelope | 63 min |
| Jul 6, 4:45 PM CDT | Tornado Warning | OAX | Antelope, Knox, Pierce | 60 min |
| Jul 6, 5:07 PM CDT | Tornado Warning | OAX | Cedar | 63 min |
| Jul 6, 5:19 PM CDT | Severe Thunderstorm Warning | OAX | Boone, Madison | 61 min |
| Jul 6, 5:19 PM CDT | Severe Thunderstorm Warning | OAX | Pierce, Wayne | 61 min |
| Jul 6, 5:26 PM CDT | Severe Thunderstorm Warning | OAX | Stanton | 79 min |
| Jul 6, 5:58 PM CDT | Severe Thunderstorm Warning | OAX | Cuming, Thurston | 67 min |
| Jul 6, 5:58 PM CDT | Severe Thunderstorm Warning | OAX | Cuming, Thurston | 62 min |
| Jul 6, 6:11 PM CDT | Tornado Warning | OAX | Colfax, Platte | 64 min |
| Jul 6, 6:16 PM CDT | Severe Thunderstorm Warning | OAX | Burt | 64 min |
| Jul 6, 6:37 PM CDT | Severe Thunderstorm Warning | OAX | Dodge | 63 min |
| Jul 6, 6:59 PM CDT | Severe Thunderstorm Warning | OAX | Washington | 61 min |
| Jul 6, 6:34 PM CDT | Tornado Warning | OAX | Monona | 61 min |
| Jul 6, 6:49 PM CDT | Tornado Warning | OAX | Harrison | 61 min |
Nearby
Severe 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.