Alert archive / Oklahoma / Flash Flood Warnings in 2009

Flash Flood Warning 6, NWS Norman, OK

April 30, 2009Kay County, Oklahoma

NWS Norman, OK issued this flash flood warning at Apr 30, 2009, 8:57 AM CDT for Kay County, Oklahoma. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 30, 2009, 8:57 AM CDT (13:57 UTC)
Expired: Apr 30, 2009, 1:00 PM CDT
In force: 4 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

County Kay County, OK

The radar

The Vance AFB radar (KVNX), 88 km from the middle of the area, began a volume at 13:59 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

Lamont, OK (KLMN), launched 12:00Z, 2.0 hours before the alert went out and 37 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: 7 J/kg
Mixed-layer CIN: -392 J/kg
Mixed-layer LCL: 675 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 312 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Apr 30, 6:50 AM CDT, 2 hours 7 minutes earlier.

Area forecast discussion, Apr 30, 6:50 AM CDT, 2 hours 7 minutes before

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Hazardous weather outlook, Apr 30, 5:15 AM CDT, 3 hours 42 minutes before

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In the hours before

Special weather statement, Apr 30, 7:41 AM CDT, 1 hour 16 minutes before

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Special weather statement, Apr 30, 7:54 AM CDT, 1 hour 3 minutes before

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Special weather statement, Apr 30, 8:30 AM CDT, 27 minutes before

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Local storm report, Apr 30, 8:56 AM CDT, 1 minute 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
Apr 29, 8:37 PM CDT	River Flood Warning	OUN	Love	4 days
Apr 29, 8:50 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson, Stephens	55 min
Apr 29, 9:05 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	40 min
Apr 29, 9:11 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	49 min
Apr 29, 9:21 PM CDT	Areal Flood Warning	OUN	Carter, Cotton, Jefferson, Love, Marshall, Stephens	6 hr
Apr 29, 9:29 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	61 min
Apr 29, 10:25 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	65 min
Apr 29, 10:37 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Tillman	53 min
Apr 29, 11:27 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Jefferson, Stephens	63 min
Apr 29, 11:48 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Love, Murray	57 min
Apr 30, 1:32 AM CDT	Areal Flood Advisory	OUN	Carter, Garvin, Johnston, Murray, Pontotoc, Stephens	3 hr
Apr 30, 2:13 AM CDT	Areal Flood Warning	OUN	Atoka, Bryan, Carter, Jefferson, Love, Marshall	6 hr
Apr 30, 2:35 AM CDT	River Flood Warning	OUN	Comanche, Cotton	42 hr
Apr 30, 12:52 PM CDT	River Flood Warning	OUN	Harper, Woods, Woodward	25 hr
Apr 30, 2:11 PM CDT	River Flood Warning	OUN	Cotton, Jefferson, Tillman	44 hr
Apr 30, 3:14 PM CDT	Flash Flood Watch	OUN	Alfalfa, Atoka, Blaine, Bryan, Caddo, Canadian and 38 more	61 hr
Apr 29, 8:04 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	56 min
Apr 29, 8:55 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Foard, Knox, Wilbarger	50 min
Apr 29, 9:40 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Foard, Hardeman, Knox, Wichita, Wilbarger	65 min
Apr 29, 9:45 PM CDT	Severe Thunderstorm Warning	OUN	Hardeman, Wilbarger	60 min
Apr 29, 10:44 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	46 min
Apr 29, 11:28 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	62 min
Apr 30, 12:10 AM CDT	Areal Flood Advisory	OUN	Archer, Clay	3 hr
Apr 30, 12:38 AM CDT	Areal Flood Advisory	OUN	Foard, Hardeman, Wilbarger	112 min
Apr 30, 12:54 AM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman, Wilbarger	66 min
Apr 30, 1:58 AM CDT	Severe Thunderstorm Warning	OUN	Archer, Wichita, Wilbarger	62 min
Apr 30, 2:49 AM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor, Wichita, Wilbarger	71 min

Nearby

Flash Flood Warnings in Oklahoma, 2009 Every flash flood 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.