Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 474, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jul 7, 1998, 9:31 PM CDT for Harper County, Woods County, Oklahoma. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 7, 1998, 9:31 PM CDT (02:31 UTC)
- Expired
- Jul 7, 1998, 10:15 PM CDT
- In force
- 44 min
- Issued by
- NWS Norman, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Harper County, OK, Woods County, OK
The radar
The Vance AFB radar (KVNX), 102 km from the middle of the area, began a volume at 02:31 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.
The nearest sounding before it
Dodge City, (KDDC), launched 00:00Z, 2.5 hours before the alert went out and 124 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
- 1481 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 1543 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 135 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.2
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 Jul 7, 9:30 PM CDT, 1 minute earlier.
Area forecast discussion, Jul 7, 9:30 PM CDT, 1 minute before
FPUS3 KOKC 080230 AFDOKC AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORMAN OK 930 PM CDT TUE JUL 7 1998 SCATTERED SEVERE STORMS KEEPING THINGS BUSY HERE. CURRENT FORECAST PACKAGE NEEDS SOME RELATIVELY MINOR ADJUSTMENTS IN THE WESTERN SECTIONS. THE MAIN CHANGES NEEDED INVOLVE DESCRIPTIONS OF THE PRECIPITATION COVERAGE AND CHANCES. PLAN TO MAKE APPROPRIATE CHANGES AS SOON AS THE STORMS PERMIT. FCSTID = 23 = CMS .OUN... OK...NONE. TX...NONE.
In the hours before
Local storm report, Jul 7, 7:02 PM CDT, 2 hours 29 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
700 PM CDT TUE JUL 7 1998
TIME (CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0630 PM BESSIE OK 58 MPH WIND GUST
07/07/98 WASHITA AT MESONET SITE
4 WNW OF BESSIELocal storm report, Jul 7, 7:35 PM CDT, 1 hour 56 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
715 PM CDT TUE JUL 7 1998
TIME (CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0707 PM 2 E LITTLE OK 60 MPH WIND GUST
07/07/98 SEMINOLE GUSTS TO ATLEAST 60 MPH
REPORTED BY POINT SPOTTER.
0707 PM 2 E LITTLE OK WIND DAMAGE
07/07/98 SEMINOLE BRANCHES BLOWING OFF OF
PECAN TREE. REPORTED BY
POINT SPOTTER.
TLLocal storm report, Jul 7, 9:11 PM CDT, 20 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
0907 PM CDT TUE JUL 7 1998
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0845 PM 2 SSW MINCO OK 58 MPH WIND GUST MEASURED
07/07/98 GRADY OKLAHOMA MESONETWORK
JSLocal storm report, Jul 7, 9:20 PM CDT, 11 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
0920 PM CDT TUE JUL 7 1998
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0850 PM 2 SSW MINCO OK 83 MPH WIND GUST MEASURED
07/07/98 GRADY OKLAHOMA MESONETWORK
JSLocal storm report, Jul 7, 9:26 PM CDT, 5 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
0922 PM CDT TUE JUL 7 1998
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0900 PM 2 SSW MINCO OK 58 MPH WIND GUST MEASURED
07/07/98 GRADY OKLAHOMA MESONETWORK
JSThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 7:19 PM CDT | Severe Thunderstorm Warning | OUN | Dewey | 26 min |
| Jul 7, 7:27 PM CDT | Severe Thunderstorm Warning | OUN | Ellis | 48 min |
| Jul 7, 7:29 PM CDT | Severe Thunderstorm Warning | OUN | Pottawatomie | 31 min |
| Jul 7, 7:40 PM CDT | Severe Thunderstorm Warning | OUN | Caddo | 50 min |
| Jul 7, 7:46 PM CDT | Severe Thunderstorm Warning | OUN | Dewey, Woodward | 44 min |
| Jul 7, 7:59 PM CDT | Severe Thunderstorm Warning | OUN | Ellis | 46 min |
| Jul 7, 8:15 PM CDT | Severe Thunderstorm Warning | OUN | Washita | 45 min |
| Jul 7, 8:25 PM CDT | Severe Thunderstorm Warning | OUN | Woodward | 50 min |
| Jul 7, 8:38 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Grady | 52 min |
| Jul 7, 8:47 PM CDT | Severe Thunderstorm Warning | OUN | Ellis, Harper | 43 min |
| Jul 7, 11:12 PM CDT | Flash Flood Warning | OUN | Roger Mills | 2 hr |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.