Alert archive / Oklahoma / Flash Flood Watches in 2007

Flash Flood Watch 8, NWS Norman, OK

July 10, 200721 counties in Oklahoma

NWS Norman, OK issued this flash flood watch at Jul 10, 2007, 3:49 AM CDT for 21 counties in Oklahoma. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Jul 10, 2007, 3:49 AM CDT (08:49 UTC)
Expired: Jul 10, 2007, 7:00 PM CDT
In force: 15 hr
Issued by: NWS Norman, OK
Flood severity: None

All 21 counties

Atoka County, OK, Bryan County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Lincoln County, OK, Love County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 70 km from the middle of the area, began a volume at 08:51 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, 8.8 hours before the alert went out and 63 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: 3020 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1274 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 7.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 watch went out at Jul 10, 3:38 AM CDT, 11 minutes earlier.

Area forecast discussion, Jul 10, 3:38 AM CDT, 11 minutes before

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Hazardous weather outlook, Jul 9, 11:35 PM CDT, 4 hours 14 minutes before

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In the hours before

Special weather statement, Jul 10, 2:10 AM CDT, 1 hour 39 minutes before

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Special weather statement, Jul 10, 2:22 AM CDT, 1 hour 27 minutes before

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Special weather statement, Jul 10, 2:34 AM CDT, 1 hour 15 minutes before

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Special weather statement, Jul 10, 2:51 AM CDT, 58 minutes before

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Special weather statement, Jul 10, 3:12 AM CDT, 37 minutes before

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Special weather statement, Jul 10, 3:49 AM CDT, 0 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
Jul 9, 7:13 PM CDT	Severe Thunderstorm Warning	OUN	Dewey	47 min
Jul 9, 7:13 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	47 min
Jul 9, 7:44 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	46 min
Jul 9, 7:47 PM CDT	Severe Thunderstorm Warning	OUN	Custer	43 min
Jul 9, 8:10 PM CDT	Severe Thunderstorm Warning	OUN	Grant	50 min
Jul 9, 8:37 PM CDT	Severe Thunderstorm Warning	OUN	Custer	23 min
Jul 9, 8:48 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Oklahoma	42 min
Jul 9, 8:51 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	39 min
Jul 9, 9:03 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	42 min
Jul 9, 9:11 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	49 min
Jul 9, 9:30 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland	45 min
Jul 9, 9:45 PM CDT	Severe Thunderstorm Warning	OUN	Greer	45 min
Jul 9, 9:54 PM CDT	Severe Thunderstorm Warning	OUN	Bryan	36 min
Jul 9, 10:04 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	41 min
Jul 9, 10:34 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	18 min
Jul 9, 10:41 PM CDT	Severe Thunderstorm Warning	OUN	Grady	49 min
Jul 9, 11:01 PM CDT	Severe Thunderstorm Warning	OUN	McClain	44 min
Jul 9, 11:10 PM CDT	Severe Thunderstorm Warning	OUN	Logan	50 min
Jul 9, 11:11 PM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	34 min
Jul 9, 11:29 PM CDT	Severe Thunderstorm Warning	OUN	Grady	31 min
Jul 9, 11:41 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland	34 min
Jul 9, 11:44 PM CDT	Severe Thunderstorm Warning	OUN	McClain	31 min
Jul 9, 11:48 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	42 min
Jul 10, 12:00 AM CDT	Severe Thunderstorm Warning	OUN	Garvin	45 min
Jul 10, 12:42 AM CDT	Severe Thunderstorm Warning	OUN	Garvin	48 min
Jul 10, 1:27 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray	48 min
Jul 10, 2:39 AM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	36 min
Jul 10, 3:02 AM CDT	Severe Thunderstorm Warning	OUN	Canadian	43 min
Jul 10, 3:29 AM CDT	Severe Thunderstorm Warning	OUN	McClain	31 min
Jul 10, 4:26 AM CDT	Severe Thunderstorm Warning	OUN	Carter	49 min
Jul 10, 5:05 AM CDT	Severe Thunderstorm Warning	OUN	Love	40 min
Jul 10, 6:15 AM CDT	Severe Thunderstorm Warning	OUN	Oklahoma	45 min
Jul 10, 4:04 PM CDT	Severe Thunderstorm Warning	OUN	Bryan	41 min
Jul 10, 4:43 PM CDT	Severe Thunderstorm Warning	OUN	Bryan	47 min

Nearby

Flash Flood Watches in Oklahoma, 2007 Every flash flood watch in 2007

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.