Alert archive / Nebraska / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 76, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at May 15, 1998, 9:47 AM CDT for Burt County, Nebraska; Monona County, Iowa. It was in force for 63 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
- May 15, 1998, 9:47 AM CDT (14:47 UTC)
- Expired
- May 15, 1998, 10:50 AM CDT
- In force
- 63 min
- Issued by
- NWS Omaha, NE
- Area
- Whole counties
Counties Monona County, IA, Burt County, NE
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 15, 10:30 AM CDT | Thunderstorm Wind 50 | Onawa, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 15, 9:45 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 2.8 hours before the alert went out and 73 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
- 1194 J/kg
- Mixed-layer CIN
- -370 J/kg
- Mixed-layer LCL
- 1627 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- -76 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
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, May 15, 5:00 AM CDT, 4 hours 47 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-161200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 500 AM CDT FRI MAY 15 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION MAY BE NEEDED OVER EASTERN NEBRASKA AND SOUTHWEST IOWA TODAY. DISCUSSION... A COLD FRONT EXTENDING ACROSS CENTRAL NEBRASKA WILL MOVE EASTWARD AS A STRONG UPPER LEVEL DISTURBANCE OVER THE TEXAS PANHANDLE LIFTS NORTHEAST INTO SOUTHWEST IOWA BY EVENING. THESE FEATURES COMBINED WITH A MOIST AND VERY UNSTABLE AIRMASS OVER THE REGION WILL BRING PERIODS OF THUNDERSTORMS TO THE REGION TODAY. THE PRIMARY THREAT FROM THESE STORMS WOULD BE LARGE HAIL AND DAMAGING WINDS. LJH
Special weather statement, May 15, 5:00 AM CDT, 4 hours 47 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-161200- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 500 AM CDT FRI MAY 15 1998 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION MAY BE NEEDED OVER EASTERN NEBRASKA AND SOUTHWEST IOWA TODAY. DISCUSSION... A COLD FRONT EXTENDING ACROSS CENTRAL NEBRASKA WILL MOVE EASTWARD AS A STRONG UPPER LEVEL DISTURBANCE OVER THE TEXAS PANHANDLE LIFTS NORTHEAST INTO SOUTHWEST IOWA BY EVENING. THESE FEATURES COMBINED WITH A MOIST AND VERY UNSTABLE AIRMASS OVER THE REGION WILL BRING PERIODS OF THUNDERSTORMS TO THE REGION TODAY. THE PRIMARY THREAT FROM THESE STORMS WOULD BE LARGE HAIL AND DAMAGING WINDS. LJH
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 15, 7:37 AM CDT | Severe Thunderstorm Warning | OAX | Gage, Jefferson, Pawnee | 48 min |
| May 15, 8:24 AM CDT | Severe Thunderstorm Warning | OAX | Johnson, Nemaha | 61 min |
| May 15, 8:24 AM CDT | Severe Thunderstorm Warning | OAX | Gage, Jefferson | 61 min |
| May 15, 8:28 AM CDT | Tornado Warning | OAX | Gage | 47 min |
| May 15, 8:39 AM CDT | Severe Thunderstorm Warning | OAX | Lancaster, Otoe | 61 min |
| May 15, 8:50 AM CDT | Tornado Warning | OAX | Lancaster, Otoe | 65 min |
| May 15, 8:58 AM CDT | Severe Thunderstorm Warning | OAX | Cass | 62 min |
| May 15, 9:10 AM CDT | Severe Thunderstorm Warning | OAX | Douglas, Sarpy, Saunders | 65 min |
| May 15, 9:34 AM CDT | Severe Thunderstorm Warning | OAX | Washington | 61 min |
| May 15, 9:34 AM CDT | Severe Thunderstorm Warning | OAX | Dodge | 61 min |
| May 15, 9:47 AM CDT | Severe Thunderstorm Warning | OAX | Cuming | 63 min |
| May 15, 10:13 AM CDT | Severe Thunderstorm Warning | OAX | Douglas | 32 min |
| May 15, 10:17 AM CDT | Severe Thunderstorm Warning | OAX | Thurston | 63 min |
| May 15, 12:55 PM CDT | Severe Thunderstorm Warning | OAX | Butler, Colfax, Platte | 65 min |
| May 15, 1:22 PM CDT | Tornado Warning | OAX | Platte | 48 min |
| May 15, 1:33 PM CDT | Severe Thunderstorm Warning | OAX | Madison, Stanton | 62 min |
| May 15, 1:49 PM CDT | Tornado Warning | OAX | Madison, Stanton | 46 min |
| May 15, 8:58 AM CDT | Severe Thunderstorm Warning | OAX | Page | 62 min |
| May 15, 9:16 AM CDT | Severe Thunderstorm Warning | OAX | Montgomery | 64 min |
| May 15, 10:03 AM CDT | Tornado Warning | OAX | Shelby | 47 min |
| May 15, 10:50 AM CDT | Severe Thunderstorm Warning | OAX | Monona | 30 min |
| May 15, 11:28 AM CDT | Severe Thunderstorm Warning | OAX | Mills, Pottawattamie | 62 min |
| May 15, 12:27 PM CDT | Tornado Warning | OAX | Pottawattamie, Shelby | 33 min |
| May 15, 2:58 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery, Pottawattamie | 62 min |
| May 15, 3:01 PM CDT | Severe Thunderstorm Warning | OAX | Harrison | 49 min |
| May 15, 3:10 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 50 min |
| May 15, 3:10 PM CDT | Severe Thunderstorm Warning | OAX | Shelby | 50 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 1998Severe Thunderstorm Warnings in Iowa, 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.