Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 756, NWS Norman, OK

October 8, 2009Coal County, Hughes County, Pontotoc County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 8, 2009, 8:56 PM CDT for Coal County, Hughes County, Pontotoc County, Oklahoma. It was in force for 49 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 8, 2009, 8:56 PM CDT (01:56 UTC)
Expired: Oct 8, 2009, 9:45 PM CDT
In force: 49 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Coal County, OK, Hughes County, OK, Pontotoc County, OK

The radar

The Norman radar (KTLX), 100 km from the middle of the area, began a volume at 01:57 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 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, 3:02 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Oct 8, 4:41 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.9 hours before the alert went out and 102 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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 453 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: -200 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

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, 6:21 PM CDT, 2 hours 35 minutes earlier.

Area forecast discussion, Oct 8, 6:21 PM CDT, 2 hours 35 minutes before

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Hazardous weather outlook, Oct 8, 5:10 PM CDT, 3 hours 46 minutes before

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In the hours before

Local storm report, Oct 8, 5:18 PM CDT, 3 hours 38 minutes before

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Local storm report, Oct 8, 5:37 PM CDT, 3 hours 19 minutes before

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Special weather statement, Oct 8, 5:57 PM CDT, 2 hours 59 minutes before

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Special weather statement, Oct 8, 6:00 PM CDT, 2 hours 56 minutes before

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Special weather statement, Oct 8, 6:31 PM CDT, 2 hours 25 minutes before

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Special weather statement, Oct 8, 6:48 PM CDT, 2 hours 8 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
Oct 8, 7:36 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	39 min
Oct 8, 8:50 PM CDT	River Flood Warning	OUN	Pottawatomie, Seminole	17 hr
Oct 8, 10:40 PM CDT	Areal Flood Advisory	OUN	Carter, Murray	3 hr
Oct 8, 11:37 PM CDT	Areal Flood Warning	OUN	Coal, Hughes, Johnston, Pontotoc, Seminole	6 hr
Oct 9, 12:24 AM CDT	Areal Flood Warning	OUN	Murray	4 hr
Oct 9, 8:40 AM CDT	River Flood Warning	OUN	Atoka, Bryan	4 days
Oct 9, 9:17 AM CDT	River Flood Warning	OUN	Bryan	18 hr
Oct 9, 2:52 PM CDT	Freeze Watch	OUN	Ellis, Harper, Roger Mills, Woods, Woodward	24 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2009 Every severe thunderstorm warning in 2009

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.