Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 514, NWS Norman, OK

October 30, 1997Seminole County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 30, 1997, 8:38 PM CST for Seminole County, Oklahoma. It was in force for 22 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 30, 1997, 8:38 PM CST (02:38 UTC)
Expired: Oct 30, 1997, 9:00 PM CST
In force: 22 min
Issued by: NWS Norman, OK
Area: Whole counties

County Seminole County, OK

The radar

The Norman radar (KTLX), 63 km from the middle of the area, began a volume at 02:38 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.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.6 hours before the alert went out and 72 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: 271 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1712 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 159 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 Oct 30, 3:53 PM CST, 4 hours 45 minutes earlier.

Area forecast discussion, Oct 30, 3:53 PM CST, 4 hours 45 minutes before

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In the hours before

Local storm report, Oct 30, 6:55 PM CST, 1 hour 43 minutes before

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Local storm report, Oct 30, 7:56 PM CST, 42 minutes before

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      <div class="status" id="status">Temporary Notice</div>
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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 30, 7:33 PM CST	Severe Thunderstorm Warning	OUN	Garvin, Murray	42 min
Oct 31, 2:13 AM CST	Flash Flood Warning	OUN	Pushmataha	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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.