Alert archive / Nebraska / Tornado Warnings in 2002
Tornado Warning 20, NWS Omaha, NE
NWS Omaha, NE issued this tornado warning at Aug 16, 2002, 7:57 PM CDT for Cedar County, Knox County, Nebraska. It was in force for 33 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
- Aug 16, 2002, 7:57 PM CDT (00:57 UTC)
- Expired
- Aug 16, 2002, 8:30 PM CDT
- In force
- 33 min
- Issued by
- NWS Omaha, NE
- Area
- Counties, with a storm outline in the text
Counties Cedar County, NE, Knox County, NE
The radar
The Sioux Falls radar (KFSD), 128 km from the middle of the area, began a volume at 00:56 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 |
|---|---|---|---|
| Aug 16, 8:06 PM CDT | Hail 0.88 | Crofton, NE | Reported near Gavins Point Dam. |
| Aug 16, 8:10 PM CDT | Hail 1.75 | St Helena, NE | Hail up to golfball size was reported near St Helena for a 15 minute period. |
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, 1.0 hours before the alert went out and 175 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
- 3070 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1356 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 229 m²/s²
- 0-3 km storm-relative helicity
- 597 m²/s²
- Significant tornado parameter
- 3.9
- Supercell composite
- 18.4
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 7:25 PM CDT | Tornado Warning | OAX | Knox | 35 min |
| Aug 16, 8:31 PM CDT | Severe Thunderstorm Warning | OAX | Cedar | 29 min |
| Aug 17, 12:02 AM CDT | Severe Thunderstorm Warning | OAX | Antelope | 28 min |
| Aug 17, 12:17 AM CDT | Severe Thunderstorm Warning | OAX | Pierce, Wayne | 43 min |
| Aug 17, 12:30 AM CDT | Severe Thunderstorm Warning | OAX | Antelope, Boone, Madison | 60 min |
| Aug 17, 12:39 AM CDT | Severe Thunderstorm Warning | OAX | Cedar | 36 min |
| Aug 17, 1:04 AM CDT | Severe Thunderstorm Warning | OAX | Thurston, Wayne | 41 min |
| Aug 17, 1:16 AM CDT | Severe Thunderstorm Warning | OAX | Cuming, Stanton | 44 min |
| Aug 17, 1:42 AM CDT | Severe Thunderstorm Warning | OAX | Colfax, Dodge | 48 min |
| Aug 17, 1:53 AM CDT | Severe Thunderstorm Warning | OAX | Burt | 22 min |
| Aug 17, 2:55 AM CDT | Severe Thunderstorm Warning | OAX | Cass, Lancaster, Otoe, Sarpy | 35 min |
| Aug 17, 3:03 AM CDT | Severe Thunderstorm Warning | OAX | Gage, Jefferson, Saline | 42 min |
| Aug 17, 3:13 AM CDT | Severe Thunderstorm Warning | OAX | Johnson, Pawnee | 32 min |
| Aug 17, 3:27 AM CDT | Severe Thunderstorm Warning | OAX | Nemaha, Richardson | 33 min |
| Aug 17, 3:51 AM CDT | Severe Thunderstorm Warning | OAX | Gage, Jefferson, Johnson, Pawnee | 24 min |
Nearby
Tornado Warnings in Nebraska, 2002Every tornado warning in 2002Tornadoes in 2002
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.