Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 656, NWS Norman, OK

September 12, 1999Harper County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Sep 12, 1999, 2:10 AM CDT for Harper County, Oklahoma. It was in force for 50 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: Sep 12, 1999, 2:10 AM CDT (07:10 UTC)
Expired: Sep 12, 1999, 3:00 AM CDT
In force: 50 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Harper County, OK

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 11, 9:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Dodge City, (KDDC), launched 00:00Z, 7.2 hours before the alert went out and 111 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: 1386 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 963 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.8

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 Sep 11, 3:30 PM CDT, 10 hours 40 minutes earlier.

Area forecast discussion, Sep 11, 3:30 PM CDT, 10 hours 40 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 11, 10:39 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	36 min
Sep 11, 10:56 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	34 min
Sep 11, 11:08 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	37 min
Sep 11, 11:29 PM CDT	Severe Thunderstorm Warning	OUN	Stephens	31 min
Sep 11, 11:43 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	32 min
Sep 12, 12:15 AM CDT	Severe Thunderstorm Warning	OUN	Comanche	30 min
Sep 12, 12:32 AM CDT	Severe Thunderstorm Warning	OUN	Tillman	28 min
Sep 12, 12:46 AM CDT	Severe Thunderstorm Warning	OUN	Comanche	29 min
Sep 12, 12:53 AM CDT	Severe Thunderstorm Warning	OUN	Tillman	37 min
Sep 12, 1:06 AM CDT	Severe Thunderstorm Warning	OUN	Cotton, Stephens	39 min
Sep 12, 1:35 AM CDT	Severe Thunderstorm Warning	OUN	Harper	40 min
Sep 12, 1:38 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	52 min
Sep 12, 2:30 AM CDT	Severe Thunderstorm Warning	OUN	Ellis	45 min
Sep 12, 2:43 AM CDT	Flash Flood Warning	OUN	Kay	2 hr
Sep 12, 3:01 AM CDT	Tornado Warning	OUN	Woodward	29 min
Sep 12, 3:20 AM CDT	Severe Thunderstorm Warning	OUN	Woods	40 min
Sep 12, 3:32 AM CDT	Tornado Warning	OUN	Woodward	28 min
Sep 12, 3:57 AM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major, Woods	33 min
Sep 12, 4:21 AM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major	24 min
Sep 12, 4:38 AM CDT	Flash Flood Warning	OUN	Woods, Woodward	2 hr
Sep 12, 10:45 AM CDT	Flash Flood Warning	OUN	Carter, Love	2 hr
Sep 11, 7:15 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Wichita, Wilbarger	30 min
Sep 11, 7:35 PM CDT	Severe Thunderstorm Warning	OUN	Knox	40 min
Sep 11, 7:44 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Wichita	46 min
Sep 11, 8:27 PM CDT	Severe Thunderstorm Warning	OUN	Hardeman	48 min
Sep 11, 9:36 PM CDT	Severe Thunderstorm Warning	OUN	Wilbarger	24 min
Sep 11, 11:53 PM CDT	Severe Thunderstorm Warning	OUN	Hardeman, Wilbarger	37 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1999 Every severe thunderstorm warning in 1999

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.