Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 736, NWS Norman, OK

October 1, 2009Atoka County, Coal County, Johnston County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 1, 2009, 3:31 PM CDT for Atoka County, Coal County, Johnston County, Oklahoma. It was in force for 59 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 1, 2009, 3:31 PM CDT (20:31 UTC)
Expired: Oct 1, 2009, 4:30 PM CDT
In force: 59 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Atoka County, OK, Coal County, OK, Johnston County, OK

The radar

The Norman radar (KTLX), 133 km from the middle of the area, began a volume at 20:31 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 1, 1:16 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 8.5 hours before the alert went out and 131 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: 1967 J/kg
Mixed-layer CIN: -251 J/kg
Mixed-layer LCL: 546 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 519 m²/s²
0-3 km storm-relative helicity: 526 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.1

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 1, 2:21 PM CDT, 1 hour 10 minutes earlier.

Area forecast discussion, Oct 1, 2:21 PM CDT, 1 hour 10 minutes before

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Hazardous weather outlook, Oct 1, 2:35 PM CDT, 56 minutes before

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In the hours before

Special weather statement, Oct 1, 1:50 PM CDT, 1 hour 41 minutes before

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Special weather statement, Oct 1, 2:10 PM CDT, 1 hour 21 minutes before

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Special weather statement, Oct 1, 3:08 PM CDT, 23 minutes before

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Special weather statement, Oct 1, 3:23 PM CDT, 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 1, 2:23 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	31 min
Oct 1, 2:28 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc, Seminole	77 min
Oct 1, 4:10 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	65 min
Oct 1, 4:41 PM CDT	Severe Thunderstorm Warning	OUN	Bryan	64 min

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.