Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 417, NWS Norman, OK

June 20, 1998Garfield County, Grant County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 20, 1998, 7:02 PM CDT for Garfield County, Grant County, Oklahoma. It was in force for 33 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: Jun 20, 1998, 7:02 PM CDT (00:02 UTC)
Expired: Jun 20, 1998, 7:35 PM CDT
In force: 33 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Garfield County, OK, Grant County, OK

The radar

The Vance AFB radar (KVNX), 35 km from the middle of the area, began a volume at 00:05 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
Jun 20, 7:30 PM CDT	Hail 1	Enid, 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
Jun 20, 5:30 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.0 hours before the alert went out and 156 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: 2183 J/kg
Mixed-layer CIN: -239 J/kg
Mixed-layer LCL: 2070 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.6

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 Jun 20, 3:30 PM CDT, 3 hours 32 minutes earlier.

Area forecast discussion, Jun 20, 3:30 PM CDT, 3 hours 32 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
330 PM CDT SAT JUN 20 1998

COLD FRONT OVR NWRN OK EXPECTED TO MOVE LITTLE THROUGH SUNDAY
MORNING THEN RETURN NORTH AS A WARM FRONT RAPIDLY SUNDAY. STRONG CAP
OVER WRN ZONES IS INHIBITING TSTMS ALONG THE DRYLINE.  HOWEVER
DRYLINE SHOULD CONTINUE TO PUSH SLOWLY EAST THIS EVENING AND IS
EXPECTED TO TRIGGER ISOLATED THUNDER SOMEWHERE IN WCNTRL/SWRN ZONES
WHERE CIN IS LOWEST.

STRENGTHENING CAP/RIDGE WILL EVENTUALLY PUT AN END TO THE POPS BUT
WILL ALSO KEEP THINGS HOT.  WILL ISSUE HEAT ADVISORY THROUGH SUNDAY
FOR MOST OF FA WITH MINS NEAR 80 AND MAXES NEAR 100/ HEAT INDEX OVER
105.

FCSTID = 10
OKC   79  99  78 100 /  20  20  20  10
HBR   78 107  80 107 /  20  20  20  10
SPS   78 109  79 108 /  20  20  20  10
GAG   65 104  70 105 /   0   0   0  20
PNC   81 101  81 101 /  20  20  10  20
DUA   80 101  80 101 /  20  20  20  10

.OUN...
OK...NONE.
TX...NONE.

~

In the hours before

Local storm report, Jun 20, 6:50 PM CDT, 12 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
650 PM CDT SAT JUN 20 1998

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

0650 PM    2 W KREMLIN               OK   1.75 INCH HAIL
06/20/98   GARFIELD

0630 PM    ENID                      OK   1.25 INCH HAIL
06/20/98   GARFIELD

0535 PM    4 E WATONGA               OK   1.00 INCH HAIL
06/20/98   BLAINE

0648 PM    LOYAL                     OK   1.00 INCH HAIL
06/20/98   KINGFISHER

0536 PM    6 S DRUMMOND              OK   1.75 INCH HAIL
06/20/98   GARFIELD

0554 PM    10 S ENID                 OK   1.75 INCH HAIL
06/20/98   GARFIELD

0550 PM    DRUMMOND                  OK   1.80 INCH HAIL
06/20/98   GARFIELD

0645 PM    8 NNW INDIAHOMA           OK   .88 INCH HAIL
06/20/98   COMANCHE

FM/ZIG

Local storm report, Jun 20, 6:50 PM CDT, 12 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
650 PM CDT SAT JUN 20 1998

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

0650 PM    2 W KREMLIN               OK   1.75 INCH HAIL
06/20/98   GARFIELD

0630 PM    ENID                      OK   1.25 INCH HAIL
06/20/98   GARFIELD

0535 PM    4 E WATONGA               OK   1.00 INCH HAIL
06/20/98   BLAINE

0648 PM    LOYAL                     OK   1.00 INCH HAIL
06/20/98   KINGFISHER

0536 PM    6 S DRUMMOND              OK   1.75 INCH HAIL
06/20/98   GARFIELD

0554 PM    10 S ENID                 OK   1.75 INCH HAIL
06/20/98   GARFIELD

0550 PM    DRUMMOND                  OK   1.80 INCH HAIL
06/20/98   GARFIELD

0645 PM    8 NNW INDIAHOMA           OK   .88 INCH HAIL
06/20/98   COMANCHE

FM/ZIG

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 7:20 PM CDT	Severe Thunderstorm Warning	OUN	Kay	40 min
Jun 20, 7:28 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	32 min
Jun 20, 7:44 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	26 min
Jun 20, 7:59 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	26 min
Jun 20, 8:07 PM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	23 min
Jun 20, 8:10 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	20 min
Jun 20, 8:25 PM CDT	Severe Thunderstorm Warning	OUN	Logan	20 min
Jun 20, 8:30 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Oklahoma	30 min
Jun 20, 8:41 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	34 min
Jun 20, 8:44 PM CDT	Severe Thunderstorm Warning	OUN	Logan	31 min
Jun 20, 8:57 PM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	33 min
Jun 20, 11:06 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	39 min
Jun 20, 11:20 PM CDT	Severe Thunderstorm Warning	OUN	Grant	40 min
Jun 20, 11:57 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	48 min
Jun 21, 12:43 AM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	47 min
Jun 21, 6:20 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	40 min
Jun 21, 6:08 PM CDT	Severe Thunderstorm Warning	OUN	Hardeman	37 min
Jun 21, 6:43 PM CDT	Severe Thunderstorm Warning	OUN	Hardeman	47 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.