Alert archive / Texas / Flash Flood Warnings in 2009

Flash Flood Warning 28, NWS Houston/Galveston, TX

May 24, 2009Polk County, San Jacinto County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at May 24, 2009, 5:38 PM CDT for Polk County, San Jacinto County, Texas. It was in force for 112 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 24, 2009, 5:38 PM CDT (22:38 UTC)
Expired
May 24, 2009, 7:30 PM CDT
In force
112 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Flood severity
None

Counties Polk County, TX, San Jacinto County, TX

The radar

The Houston radar (KHGX), 135 km from the middle of the area, began a volume at 22:37 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

Fort Worth, TX (KFWD), launched 12:00Z, 10.6 hours before the alert went out and 322 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, Fort Worth, TX at 12:00Z on 2009-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 692 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, Fort Worth, TX at 12:00Z on 2009-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 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
692 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
556 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
11 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 24, 11:53 AM CDTAreal Flood AdvisoryHGXAustin, Colorado112 min
May 24, 11:57 AM CDTSpecial Marine WarningHGX93 min
May 24, 1:32 PM CDTSevere Thunderstorm WarningHGXBrazoria43 min
May 24, 3:11 PM CDTAreal Flood AdvisoryHGXMatagorda2 hr
May 24, 3:16 PM CDTSevere Thunderstorm WarningHGXBrazoria, Galveston, Harris44 min
May 24, 3:38 PM CDTFlash Flood WarningHGXMatagorda112 min
May 24, 3:49 PM CDTSpecial Marine WarningHGX41 min
May 24, 5:18 PM CDTSpecial Marine WarningHGX57 min

Nearby

Flash Flood Warnings in Texas, 2009Every flash flood warning 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.