Alert archive / Texas / Flash Flood Watches in 2009

Flash Flood Watch 2, NWS Amarillo, TX

July 29, 200920 counties in Texas; Beaver County, Cimarron County, Texas County, Oklahoma

NWS Amarillo, TX issued this flash flood watch at Jul 29, 2009, 4:38 AM CDT for 20 counties in Texas; Beaver County, Cimarron County, Texas County, Oklahoma. It took effect at Jul 29, 2009, 1:00 PM CDT. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Jul 29, 2009, 4:38 AM CDT (09:38 UTC)
In effect from: Jul 29, 2009, 1:00 PM CDT
Expired: Jul 30, 2009, 4:13 AM CDT
In force: 15 hr
Issued by: NWS Amarillo, TX
Flood severity: None

All 23 counties

Beaver County, OK, Cimarron County, OK, Texas County, OK, Armstrong County, TX, Carson County, TX, Collingsworth County, TX, Dallam County, TX, Deaf Smith County, TX, Donley County, TX, Gray County, TX, Hansford County, TX, Hartley County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Oldham County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 66 km from the middle of the area, began a volume at 09:39 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, 9.6 hours before the alert went out and 66 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: 489 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 2404 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.7

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 Jul 29, 12:01 AM CDT, 4 hours 37 minutes earlier.

Area forecast discussion, Jul 29, 12:01 AM CDT, 4 hours 37 minutes before

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Hazardous weather outlook, Jul 28, 11:57 PM CDT, 4 hours 41 minutes before

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In the hours before

Special weather statement, Jul 28, 11:34 PM CDT, 5 hours 4 minutes before

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Special weather statement, Jul 29, 12:36 AM CDT, 4 hours 2 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
Jul 28, 7:03 PM CDT	Areal Flood Advisory	AMA	Potter, Randall	3 hr
Jul 28, 7:22 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Potter, Randall	53 min
Jul 28, 7:34 PM CDT	Flash Flood Warning	AMA	Armstrong, Carson, Potter, Randall	4 hr
Jul 28, 7:47 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Donley, Gray, Potter	58 min
Jul 28, 8:09 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Randall	42 min
Jul 28, 8:45 PM CDT	Severe Thunderstorm Warning	AMA	Collingsworth, Donley, Gray, Wheeler	60 min
Jul 28, 10:37 PM CDT	Areal Flood Advisory	AMA	Lipscomb	3 hr
Jul 28, 11:34 PM CDT	Areal Flood Warning	AMA	Randall	12 hr
Jul 29, 5:19 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	56 min
Jul 29, 6:02 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	47 min
Jul 29, 6:32 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Hartley, Oldham	58 min
Jul 29, 6:41 PM CDT	Severe Thunderstorm Warning	AMA	Cimarron	34 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.