Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 471, NWS Norman, OK

July 7, 1998Woodward County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 7, 1998, 8:25 PM CDT for Woodward County, Oklahoma. It was in force for 50 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: Jul 7, 1998, 8:25 PM CDT (01:25 UTC)
Expired: Jul 7, 1998, 9:15 PM CDT
In force: 50 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Woodward County, OK

The radar

The Vance AFB radar (KVNX), 108 km from the middle of the area, began a volume at 01:27 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
Jul 7, 8:50 PM CDT	Thunderstorm Wind 56	Ft Supply, 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 nearest sounding before it

Dodge City, (KDDC), launched 00:00Z, 1.4 hours before the alert went out and 160 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

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

Open this sounding in Storm Lab

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, 3:30 PM CDT, 4 hours 55 minutes earlier.

Area forecast discussion, Jul 7, 3:30 PM CDT, 4 hours 55 minutes before

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In the hours before

Local storm report, Jul 7, 7:02 PM CDT, 1 hour 23 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 BESSIE

Local storm report, Jul 7, 7:35 PM CDT, 50 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.

TL

The 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, 8:38 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, 9:31 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woods	44 min
Jul 7, 11:12 PM CDT	Flash Flood Warning	OUN	Roger Mills	2 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1998 Every 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; radar from the NEXRAD Level II archive.