Alert archive / Texas / Flash Flood Watches in 2009

Flash Flood Watch 3, NWS Amarillo, TX

August 18, 200916 counties in Texas; Beaver County, Texas County, Oklahoma

NWS Amarillo, TX issued this flash flood watch at Aug 18, 2009, 4:50 AM CDT for 16 counties in Texas; Beaver County, Texas County, Oklahoma. It took effect at Aug 18, 2009, 7:00 AM CDT. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued: Aug 18, 2009, 4:50 AM CDT (09:50 UTC)
In effect from: Aug 18, 2009, 7:00 AM CDT
Expired: Aug 19, 2009, 4:00 AM CDT
In force: 21 hr
Issued by: NWS Amarillo, TX
Flood severity: None

Counties Beaver County, OK, Texas County, OK, Armstrong County, TX, Carson County, TX, Collingsworth County, TX, Donley County, TX, Gray County, TX, Hansford County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 81 km from the middle of the area, began a volume at 09:52 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 9.8 hours before the alert went out and 81 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: 607 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 2171 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 432 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

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 Amarillo, TX wrote its last area forecast discussion before this flash flood watch went out at Aug 18, 3:49 AM CDT, 1 hour 1 minute earlier.

Area forecast discussion, Aug 18, 3:49 AM CDT, 1 hour 1 minute before

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Hazardous weather outlook, Aug 18, 1:09 AM CDT, 3 hours 41 minutes before

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In the hours before

Local storm report, Aug 17, 11:20 PM CDT, 5 hours 30 minutes before

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Special weather statement, Aug 17, 11:47 PM CDT, 5 hours 3 minutes before

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Special weather statement, Aug 17, 11:56 PM CDT, 4 hours 54 minutes before

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Special weather statement, Aug 17, 11:58 PM CDT, 4 hours 52 minutes before

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Special weather statement, Aug 18, 12:38 AM CDT, 4 hours 12 minutes before

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Special weather statement, Aug 18, 1:15 AM CDT, 3 hours 35 minutes before

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The office that day

Everything else NWS Amarillo, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 17, 7:08 PM CDT	Severe Thunderstorm Warning	AMA	Donley	67 min
Aug 17, 7:11 PM CDT	Severe Thunderstorm Warning	AMA	Gray, Wheeler	64 min
Aug 17, 7:36 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	54 min
Aug 17, 8:22 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Sherman	53 min
Aug 17, 8:39 PM CDT	Severe Thunderstorm Warning	AMA	Collingsworth	44 min
Aug 17, 8:50 PM CDT	Severe Thunderstorm Warning	AMA	Hansford, Sherman	55 min
Aug 17, 9:19 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	56 min
Aug 17, 9:25 PM CDT	Severe Thunderstorm Warning	AMA	Hansford, Hutchinson	65 min
Aug 17, 11:05 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Sherman	55 min
Aug 18, 2:38 AM CDT	Areal Flood Advisory	AMA	Potter, Randall	112 min
Aug 18, 5:48 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley	57 min
Aug 18, 6:08 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Oldham	82 min
Aug 18, 6:35 PM CDT	Tornado Warning	AMA	Deaf Smith, Oldham	40 min
Aug 18, 6:56 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley	64 min
Aug 17, 7:43 PM CDT	Severe Thunderstorm Warning	AMA	Beaver, Texas	30 min

Nearby

Flash Flood Watches in Texas, 2009 Flash Flood Watches in Oklahoma, 2009 Every flash flood watch 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.