Alert archive / Texas / Flash Flood Watches in 2011

Flash Flood Watch 2, NWS San Angelo, TX

October 8, 201123 counties in Texas

NWS San Angelo, TX issued this flash flood watch at Oct 8, 2011, 5:16 AM CDT for 23 counties in Texas. It took effect at Oct 8, 2011, 7:00 AM CDT. It was in force for 28 hr.

The area

The counties it named.

The facts

Issued: Oct 8, 2011, 5:16 AM CDT (10:16 UTC)
In effect from: Oct 8, 2011, 7:00 AM CDT
Expired: Oct 9, 2011, 10:52 AM CDT
In force: 28 hr
Issued by: NWS San Angelo, TX
Flood severity: None

All 23 counties

Brown County, TX, Callahan County, TX, Coke County, TX, Coleman County, TX, Concho County, TX, Fisher County, TX, Haskell County, TX, Irion County, TX, Jones County, TX, Kimble County, TX, Mason County, TX, McCulloch County, TX, Menard County, TX, Nolan County, TX, Runnels County, TX, San Saba County, TX, Schleicher County, TX, Shackelford County, TX, Sterling County, TX, Sutton County, TX, Taylor County, TX, Throckmorton County, TX, Tom Green County, TX

The radar

The San Angelo radar (KSJT), 71 km from the middle of the area, began a volume at 10:17 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

Midland Regional, TX (KMAF), launched 00:00Z, 10.3 hours before the alert went out and 219 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: 493 J/kg
Mixed-layer CIN: -177 J/kg
Mixed-layer LCL: 2174 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 San Angelo, TX wrote its last area forecast discussion before this flash flood watch went out at Oct 8, 3:49 AM CDT, 1 hour 27 minutes earlier.

Area forecast discussion, Oct 8, 3:49 AM CDT, 1 hour 27 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 8, 1:57 PM CDT	Areal Flood Advisory	SJT	Taylor	108 min
Oct 8, 2:27 PM CDT	Areal Flood Advisory	SJT	Tom Green	48 min
Oct 8, 3:55 PM CDT	Special Weather Statement	SJT	Brown, Callahan, Coleman	65 min
Oct 8, 4:47 PM CDT	Special Weather Statement	SJT	Crockett, Schleicher, Sutton	88 min
Oct 8, 5:27 PM CDT	Areal Flood Advisory	SJT	Crockett, Schleicher, Sutton	108 min
Oct 8, 5:54 PM CDT	Areal Flood Advisory	SJT	Coleman, Runnels	111 min
Oct 8, 6:07 PM CDT	Areal Flood Advisory	SJT	Taylor	113 min
Oct 8, 6:25 PM CDT	Areal Flood Advisory	SJT	Callahan, Shackelford	110 min
Oct 8, 6:58 PM CDT	Areal Flood Advisory	SJT	Tom Green	77 min

Nearby

Flash Flood Watches in Texas, 2011 Every flash flood watch in 2011

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.