Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 105, NWS Norman, OK

April 6, 1998Pontotoc County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 6, 1998, 9:38 PM CDT for Pontotoc County, Oklahoma. It was in force for 67 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: Apr 6, 1998, 9:38 PM CDT (02:38 UTC)
Expired: Apr 6, 1998, 10:45 PM CDT
In force: 67 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Pontotoc County, OK

The radar

The Norman radar (KTLX), 86 km from the middle of the area, began a volume at 02:39 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
Apr 6, 10:15 PM CDT	Hail 0.88	Fittstown, 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
Apr 6, 7:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.6 hours before the alert went out and 85 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: 112 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 1259 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 216 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Apr 6, 9:25 PM CDT, 13 minutes earlier.

Area forecast discussion, Apr 6, 9:25 PM CDT, 13 minutes before

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In the hours before

Local storm report, Apr 6, 5:46 PM CDT, 3 hours 52 minutes before

LOCAL STORM REPORT...DELAYED REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
545 PM MON APR 6 1998

TIME(CST)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

450 PM     7 N CROWELL               TX    0.88 INCH HAIL.
04/06/98   FOARD

500 PM     13 S QUANAH               TX    0.88 INCH HAIL.
04/06/98

545 PM     VERNON                    TX    1.00 INCH HAIL.
04/06/98   WILBARGER

SC

Local storm report, Apr 6, 6:21 PM CDT, 3 hours 17 minutes before

LOCAL STORM REPORT...DELAYED REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
620 PM MON APR 6 1998

TIME(CST)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

616 PM     5 S CACHE                 OK    0.75 INCH HAIL.
04/06/98   COMANCHE

SC

Local storm report, Apr 6, 6:56 PM CDT, 2 hours 42 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
0651 PM CDT MON APR  6 1998

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0630 PM     3 SSW   FREEDOM          OK   61 MPH WIND GUST, MEASURED
04/06/98   WOODWARD                       OKLAHOMA MESONETWORK

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 6, 7:09 PM CDT	Severe Thunderstorm Warning	OUN	Major	66 min
Apr 6, 7:14 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	61 min
Apr 6, 7:34 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain	56 min
Apr 6, 7:47 PM CDT	Tornado Warning	OUN	Cotton, Stephens	58 min
Apr 6, 7:51 PM CDT	Severe Thunderstorm Warning	OUN	Grant	54 min
Apr 6, 8:26 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie	49 min
Apr 6, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	47 min
Apr 6, 8:37 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	53 min
Apr 6, 8:42 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Stephens	63 min
Apr 6, 8:53 PM CDT	Severe Thunderstorm Warning	OUN	Seminole	67 min
Apr 6, 9:00 PM CDT	Severe Thunderstorm Warning	OUN	Murray	60 min
Apr 6, 9:21 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	54 min
Apr 6, 10:12 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes	63 min
Apr 6, 10:57 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	48 min
Apr 7, 4:54 PM CDT	Severe Thunderstorm Warning	OUN	Woodward	36 min
Apr 7, 5:29 PM CDT	Severe Thunderstorm Warning	OUN	Major, Woods	46 min
Apr 7, 6:55 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	35 min

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.