Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 451, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 20, 1997, 1:18 PM CDT for Woods County, Woodward County, Oklahoma. It was in force for 57 min. 3 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 20, 1997, 1:18 PM CDT (18:18 UTC)
- Expired
- Aug 20, 1997, 2:15 PM CDT
- In force
- 57 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Woods County, OK, Woodward County, OK
The radar
The Vance AFB radar (KVNX), 85 km from the middle of the area, began a volume at 18:18 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 20, 1:35 PM CDT | Hail 1 | Lookout, OK | |
| Aug 20, 1:55 PM CDT | Hail 1.75 | Mooreland, OK | |
| Aug 20, 2:10 PM CDT | Hail 1.75 | Mooreland, OK |
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 |
|---|---|---|---|
| Aug 20, 1:00 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lamont, OK (KLMN), launched 12:00Z, 6.3 hours before the alert went out and 142 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
- 949 J/kg
- Mixed-layer CIN
- -205 J/kg
- Mixed-layer LCL
- 1154 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -57 m²/s²
- 0-3 km storm-relative helicity
- -33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.5
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.
NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 19, 3:47 PM CDT, 21 hours 31 minutes earlier.
Area forecast discussion, Aug 19, 3:47 PM CDT, 21 hours 31 minutes before
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</html>The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 12:35 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa | 40 min |
| Aug 20, 1:13 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa | 47 min |
| Aug 20, 1:56 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Garfield, Major | 64 min |
| Aug 20, 2:14 PM CDT | Severe Thunderstorm Warning | OUN | Major, Woodward | 61 min |
| Aug 20, 2:40 PM CDT | Severe Thunderstorm Warning | OUN | Dewey | 65 min |
| Aug 20, 3:17 PM CDT | Severe Thunderstorm Warning | OUN | Ellis | 58 min |
| Aug 20, 3:27 PM CDT | Severe Thunderstorm Warning | OUN | Custer, Roger Mills | 63 min |
| Aug 20, 4:30 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Custer, Roger Mills, Washita | 60 min |
| Aug 20, 5:17 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Greer | 43 min |
| Aug 20, 5:58 PM CDT | Severe Thunderstorm Warning | OUN | Greer | 47 min |
| Aug 19, 7:20 PM CDT | Severe Thunderstorm Warning | OUN | Foard | 40 min |
| Aug 19, 8:01 PM CDT | Severe Thunderstorm Warning | OUN | Foard, Knox | 44 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 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.