Alert archive / Texas / Special Weather Statements in 2011

Special Weather Statement, NWS Houston/Galveston, TX

September 19, 201112 counties in Texas

NWS Houston/Galveston, TX issued this special weather statement at Sep 19, 2011, 3:48 AM CDT for 12 counties in Texas. It was in force for 117 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 19, 2011, 3:48 AM CDT (08:48 UTC)
Expired: Sep 19, 2011, 5:45 AM CDT
In force: 117 min
Issued by: NWS Houston/Galveston, TX

Counties Austin County, TX, Brazoria County, TX, Colorado County, TX, Fort Bend County, TX, Harris County, TX, Jackson County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Waller County, TX, Washington County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 81 km from the middle of the area, began a volume at 08:48 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

Shreveport, LA (KSHV), launched 00:00Z, 8.8 hours before the alert went out and 405 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: 571 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1671 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 5.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 19, 12:49 AM CDT	Special Weather Statement	HGX	Houston	56 min
Sep 19, 2:08 AM CDT	Special Weather Statement	HGX	Brazos, Grimes, Madison	52 min
Sep 19, 4:23 AM CDT	Special Marine Warning	HGX		52 min
Sep 19, 5:55 AM CDT	Special Marine Warning	HGX		65 min

Nearby

Special Weather Statements in Texas, 2011 Every special weather statement 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.