Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 501, NWS Norman, OK

October 8, 1997Logan County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 8, 1997, 9:00 PM CDT for Logan County, Oklahoma. It was in force for 45 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: Oct 8, 1997, 9:00 PM CDT (02:00 UTC)
Expired: Oct 8, 1997, 9:45 PM CDT
In force: 45 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Logan County, OK

The radar

The Norman radar (KTLX), 67 km from the middle of the area, began a volume at 02:04 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
Oct 8, 9:30 PM CDT	Thunderstorm Wind	Guthrie, OK	Severe thunderstorm winds blew the roof off a barn and downed trees.

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
Oct 8, 5:45 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.0 hours before the alert went out and 78 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: 2384 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 800 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 192 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 9.2

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 Oct 8, 8:40 PM CDT, 20 minutes earlier.

Area forecast discussion, Oct 8, 8:40 PM CDT, 20 minutes before

FPUS3 KOKC 090140
AFDOKC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
840 PM CDT WED OCT 8 1997

MDT CAPE AND SHEAR HAVE COMBINED TO PRODUCE ACTIVE EVENING OF SUPERCELLS
ACROSS CENTRAL OKLAHOMA. STORMS CONTINUE TO FIRE ALONG AND IN ADVANCE OF
SURFACE BOUNDARY FROM NEAR CHEROKEE SWD TO NEAR ALTUS AT 0130Z. ANALYSIS
OF OKLAHOMA MESONETWORK DATA AND KFDR VELOCITY PRODUCTS INDICATES
BOUNDARY IS STATIONARY OR PUSHING SLIGHTLY EASTWARD.  GIVEN THESE TRENDS
IT APPEARS BOUNDARY WILL BE SLOWER THAN PREVIOUS FORECAST...AND MAY NOT
MOVE MUCH AT ALL UNTIL FRONT LOCATED IN WESTERN KANSAS MOVES INTO
OKLAHOMA...WHICH SHOULD HAPPEN DURING EARLY MORNING HOURS BASED ON
ISALLOBARIC MAXIMUM IN CENTRAL PLAINS.

IN THE MEANTIME...SCT CONVECTION...SOME SEVERE...WILL CONTINUE MAINLY
ACROSS CENTRAL ONE THIRD OF OKLAHOMA TO THE EAST OF SURFACE BOUNDARY.
WILL UPDATE ZONES TO ADJUST FOR SLOWER INTRUSION OF LOW-LEVEL DRY AIR.

..16..

.OKC...
OK...NONE.
TX...NONE.

DA

In the hours before

Local storm report, Oct 8, 6:55 PM CDT, 2 hours 5 minutes before

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Local storm report, Oct 8, 7:13 PM CDT, 1 hour 47 minutes before

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Local storm report, Oct 8, 7:15 PM CDT, 1 hour 45 minutes before

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Local storm report, Oct 8, 7:55 PM CDT, 1 hour 5 minutes before

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Local storm report, Oct 8, 8:00 PM CDT, 1 hour before

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Local storm report, Oct 8, 8:55 PM CDT, 5 minutes before

LOCAL STORM REPORT...CORRECTED FOR COUNTY
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
715 PM CDT WED OCT 08 1997

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

0855 PM    7 SE BILLINGS             OK   TORNADO
10/08/97   NOBLE                          REPORTED BY SPOTTER

JS

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 8, 7:32 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	43 min
Oct 8, 8:00 PM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	45 min
Oct 8, 8:14 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	61 min
Oct 8, 8:53 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	37 min
Oct 8, 8:55 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady	35 min
Oct 8, 9:14 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	46 min
Oct 8, 10:39 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	51 min
Oct 8, 11:00 PM CDT	Flash Flood Warning	OUN	Oklahoma	2 hr
Oct 8, 11:04 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Grady	41 min
Oct 8, 11:52 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Stephens	53 min
Oct 8, 11:55 PM CDT	Flash Flood Warning	OUN	Comanche	2 hr
Oct 9, 4:50 AM CDT	Flash Flood Warning	OUN	Jefferson	3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1997 Every 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.