Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 111, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Aug 14, 1997, 6:43 PM CDT for Knox County, Nebraska. It was in force for 62 min. 6 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
- Aug 14, 1997, 6:43 PM CDT (23:43 UTC)
- Expired
- Aug 14, 1997, 7:45 PM CDT
- In force
- 62 min
- Issued by
- NWS Omaha, NE
- Area
- Whole counties
County Knox County, NE
The radar
The Sioux Falls radar (KFSD), 142 km from the middle of the area, began a volume at 23:43 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 |
|---|---|---|---|
| Aug 14, 6:45 PM CDT | Hail 2.5 | Verdel, NE | |
| Aug 14, 6:45 PM CDT | Hail 2.5 | Center, NE | A significant hailstorm damaged corn and soybean crops in many parts of Knox county. The most significant damage occurred between Verdigre and Niobrara then east to Center and Bloomfield. |
| Aug 14, 7:01 PM CDT | Thunderstorm Wind 61 | Verdigre, NE | |
| Aug 14, 7:40 PM CDT | Thunderstorm Wind 61 | Center, NE | Numerous 3 to 4 inch tree limbs downed. |
| Aug 14, 7:50 PM CDT | Thunderstorm Wind 61 | Verdigre, NE | Many trees and power lines downed. |
| Aug 14, 7:55 PM CDT | Hail 0.75 | Bloomfield, NE |
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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.7 hours before the alert went out and 280 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
- 22 J/kg
- Mixed-layer CIN
- -328 J/kg
- Mixed-layer LCL
- 1120 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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, Aug 14, 5:55 PM CDT, 48 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093- IAZ043-055-056-069-079-080-090-091-151200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 555 PM CDT THU AUG 14 1997 ...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA... SPOTTER ACTION... STORM SPOTTER ACTIVATION MAY BE NECESSARY THIS EVENING INTO TONIGHT OVER EASTERN NEBRASKA AND SOUTHWEST IOWA. DISCUSSION... THUNDERSTORMS HAVE STARTED TO DEVELOP AHEAD OF A SURFACE TROF THAT EXTENDS FROM CENTRAL SOUTH DAKOTA THROUGH CENTRAL NEBRASKA. VERY UNSTABLE AIR IS IN PLACE ACROSS EASTERN NEBRASKA AND AS THE STORMS MOVE EAST INTO THE REGION THIS EVENING SEVERE STORMS MAY DEVELOP WITH THE PRIMARY THREAT BEING LARGE HAIL AND DAMAGING WINDS. FOBERT
Nearby
Severe 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.