Alert archive / Texas / Special Weather Statements in 2015

Special Weather Statement, NWS Houston/Galveston, TX

April 24, 2015Polk County, Texas

NWS Houston/Galveston, TX issued this special weather statement at Apr 24, 2015, 10:21 AM CDT for Polk County, Texas. It was in force for 39 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: Apr 24, 2015, 10:21 AM CDT (15:21 UTC)
Expired: Apr 24, 2015, 11:00 AM CDT
In force: 39 min
Issued by: NWS Houston/Galveston, TX

County Polk County, TX

The radar

The Houston radar (KHGX), 133 km from the middle of the area, began a volume at 15:21 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 3.4 hours before the alert went out and 162 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: 1123 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 692 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Houston/Galveston, TX wrote its last area forecast discussion before this special weather statement went out at Apr 24, 9:48 AM CDT, 33 minutes earlier.

Area forecast discussion, Apr 24, 9:48 AM CDT, 33 minutes before

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Hazardous weather outlook, Apr 24, 4:07 AM CDT, 6 hours 14 minutes before

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In the hours before

Special weather statement, Apr 24, 7:48 AM CDT, 2 hours 33 minutes before

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Special weather statement, Apr 24, 10:05 AM CDT, 16 minutes before

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Special weather statement, Apr 24, 10:21 AM CDT, 0 minutes before

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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
Apr 23, 10:58 PM CDT	River Flood Warning	HGX	Brazoria	77 min
Apr 24, 7:45 AM CDT	Areal Flood Advisory	HGX	Burleson, Washington	2 hr
Apr 24, 7:48 AM CDT	Special Weather Statement	HGX	Brazos, Burleson	27 min
Apr 24, 10:05 AM CDT	Special Weather Statement	HGX	Polk, San Jacinto, Trinity	40 min
Apr 24, 11:06 AM CDT	Areal Flood Advisory	HGX	Polk	114 min
Apr 24, 4:52 PM CDT	Special Weather Statement	HGX	Madison	38 min
Apr 24, 5:03 PM CDT	Severe Thunderstorm Warning	HGX	Houston, Madison	27 min
Apr 24, 5:15 PM CDT	Tornado Warning	HGX	Houston, Madison, Trinity, Walker	30 min
Apr 24, 5:44 PM CDT	Special Weather Statement	HGX	Houston	46 min
Apr 24, 6:09 PM CDT	Special Weather Statement	HGX	Trinity	36 min

Nearby

Special Weather Statements in Texas, 2015 Every special weather statement in 2015

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.