Alert archive / Texas / Flash Flood Watches in 2009

Flash Flood Watch 1, NWS Brownsville, TX

September 10, 20096 counties in Texas

NWS Brownsville, TX issued this flash flood watch at Sep 10, 2009, 9:35 AM CDT for 6 counties in Texas. It was in force for 33 hr.

The area

The counties it named.

The facts

Issued
Sep 10, 2009, 9:35 AM CDT (14:35 UTC)
Expired
Sep 11, 2009, 7:00 PM CDT
In force
33 hr
Issued by
NWS Brownsville, TX
Flood severity
None

Counties Brooks County, TX, Cameron County, TX, Hidalgo County, TX, Kenedy County, TX, Starr County, TX, Willacy County, TX

The radar

The Brownsville radar (KBRO), 93 km from the middle of the area, began a volume at 14:36 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

Del Rio, TX (KDRT), launched 12:00Z, 2.6 hours before the alert went out and 418 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-pSkew-T log-p diagram, Del Rio, TX at 12:00Z on 2009-09-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 324 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 12:00Z on 2009-09-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
324 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
606 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
-25 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 9, 8:07 PM CDTAreal Flood AdvisoryBROStarr53 min
Sep 9, 9:01 PM CDTAreal Flood AdvisoryBROStarr119 min
Sep 10, 6:22 AM CDTAreal Flood AdvisoryBROCameron53 min
Sep 10, 9:40 AM CDTAreal Flood AdvisoryBROKenedy65 min
Sep 10, 11:29 AM CDTAreal Flood AdvisoryBROStarr3 hr
Sep 10, 12:59 PM CDTAreal Flood AdvisoryBROCameron91 min
Sep 10, 3:00 PM CDTAreal Flood AdvisoryBROCameron2 hr

Nearby

Flash Flood Watches in Texas, 2009Every 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.