Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Houston/Galveston, TX

April 30, 2021Colorado County, Wharton County, Texas

NWS Houston/Galveston, TX issued this special weather statement at Apr 30, 2021, 5:08 AM CDT for Colorado County, Wharton County, Texas. It was in force for 52 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 30, 2021, 5:08 AM CDT (10:08 UTC)
Expired: Apr 30, 2021, 6:00 AM CDT
In force: 52 min
Issued by: NWS Houston/Galveston, TX

Counties Colorado County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 140 km from the middle of the area, began a volume at 10:12 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

Corpus Christi, TX (KCRP), launched 00:00Z, 10.1 hours before the alert went out and 208 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: 1919 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 738 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: -55 m²/s²
0-3 km storm-relative helicity: -51 m²/s²
Significant tornado parameter: -0.8
Supercell composite: -5.8

Open this sounding in Storm Lab

The text

As transmitted.

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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 30, 4:56 AM CDT, 12 minutes earlier.

Area forecast discussion, Apr 30, 4:56 AM CDT, 12 minutes before

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In the hours before

Special weather statement, Apr 30, 4:05 AM CDT, 1 hour 3 minutes before

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Special weather statement, Apr 30, 5:06 AM CDT, 2 minutes before

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Special weather statement, Apr 30, 5:08 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 29, 9:33 PM CDT	Flash Flood Watch	HGX	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more	55 hr
Apr 30, 3:17 AM CDT	Areal Flood Advisory	HGX	Houston, Madison, Trinity, Walker	3 hr
Apr 30, 3:38 AM CDT	Coastal Flood Advisory	HGX	Brazoria, Galveston, Matagorda	15 hr
Apr 30, 3:38 AM CDT	Rip Current Statement	HGX	Brazoria, Galveston, Matagorda	15 hr
Apr 30, 3:49 AM CDT	Small Craft Advisory	HGX		17 hr
Apr 30, 4:05 AM CDT	Special Weather Statement	HGX	Matagorda	40 min
Apr 30, 5:06 AM CDT	Special Weather Statement	HGX	Liberty, Polk, San Jacinto	39 min
Apr 30, 5:40 AM CDT	Areal Flood Advisory	HGX	Austin, Grimes, Harris, Montgomery, Waller, Washington	3 hr
Apr 30, 6:01 AM CDT	Flash Flood Warning	HGX	Grimes, Harris, Montgomery, San Jacinto, Walker, Waller	5 hr
Apr 30, 7:05 AM CDT	Areal Flood Advisory	HGX	Liberty, Montgomery, Polk, San Jacinto	3 hr
Apr 30, 8:19 AM CDT	Areal Flood Advisory	HGX	Chambers, Harris, Liberty, Montgomery	116 min
Apr 30, 9:12 AM CDT	Areal Flood Advisory	HGX	Harris, Liberty, Montgomery, Polk, San Jacinto	2 hr
Apr 30, 9:53 AM CDT	Areal Flood Advisory	HGX	Austin, Harris, Waller, Washington	112 min
Apr 30, 11:04 AM CDT	Areal Flood Advisory	HGX	Austin, Brazos, Burleson, Grimes, Harris, Houston and 9 more	116 min

Nearby

Special Weather Statements in Texas, 2021 Every special weather statement in 2021

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.