Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 348, NWS Norman, OK

July 11, 1997Harmon County, Jackson County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 11, 1997, 7:18 PM CDT for Harmon County, Jackson County, Oklahoma. It was in force for 42 min. 3 reports 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 11, 1997, 7:18 PM CDT (00:18 UTC)
Expired: Jul 11, 1997, 8:00 PM CDT
In force: 42 min
Issued by: NWS Norman, OK
Area: Whole counties

Counties Harmon County, OK, Jackson County, OK

What was reported inside it

Time	Report	Where	Remark
Jul 11, 7:20 PM CDT	Thunderstorm Wind	Hollis, OK	Severe thunderstorm winds damaged fences and roofs, blew windows out, split or uprooted several trees, and destroyed one carport.
Jul 11, 7:30 PM CDT	Thunderstorm Wind 55	Gould, OK	measured at the Oklahoma Mesonet site.
Jul 11, 7:45 PM CDT	Thunderstorm Wind	Eldorado, OK	Power poles were blown down.

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

Amarillo Airport, TX (KAMA), launched 00:00Z, 0.3 hours before the alert went out and 199 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: 147 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 2560 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 11, 4:03 PM CDT, 3 hours 15 minutes earlier.

Area forecast discussion, Jul 11, 4:03 PM CDT, 3 hours 15 minutes before

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In the hours before

Special weather statement, Jul 11, 2:45 PM CDT, 4 hours 33 minutes before

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Special weather statement, Jul 11, 2:49 PM CDT, 4 hours 29 minutes before

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Special weather statement, Jul 11, 3:01 PM CDT, 4 hours 17 minutes before

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Local storm report, Jul 11, 5:57 PM CDT, 1 hour 21 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
558 PM CDT FRI JUL 11 1997

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

455 PM     CANUTE                    OK   SEMI TRUCK BLOWN OVER ON
07/11/97   WASHITA                        INTERSTATE 40

JS

Local storm report, Jul 11, 5:58 PM CDT, 1 hour 20 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
558 PM CDT FRI JUL 11 1997

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

455 PM     CANUTE                    OK   SEMI TRUCK BLOWN OVER ON
07/11/97   WASHITA                        INTERSTATE 40

JS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 9:01 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	44 min
Jul 11, 9:01 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	44 min
Jul 11, 10:13 PM CDT	Flash Flood Warning	OUN	Greer, Jackson, Kiowa	3 hr
Jul 11, 10:13 PM CDT	Flash Flood Warning	OUN	Hardeman	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.