Alert archive / Texas / Areal Flood Warnings in 2021

Areal Flood Warning 16, NWS Houston/Galveston, TX

May 24, 2021Brazoria County, Harris County, Texas

NWS Houston/Galveston, TX issued this areal flood warning at May 24, 2021, 3:44 PM CDT for Brazoria County, Harris County, Texas. It was in force for 2 hr. 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, 2021, 3:44 PM CDT (20:44 UTC)
Expired: May 24, 2021, 5:45 PM CDT
In force: 2 hr
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon
Flood severity: None

Counties Brazoria County, TX, Harris County, TX

The radar

The Houston radar (KHGX), 33 km from the middle of the area, began a volume at 20:46 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 12:00Z, 8.7 hours before the alert went out and 273 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: 1151 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 608 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -32 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning 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 areal flood warning went out at May 24, 1:29 PM CDT, 2 hours 15 minutes earlier.

Area forecast discussion, May 24, 1:29 PM CDT, 2 hours 15 minutes before

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In the hours before

Local storm report, May 24, 1:04 PM CDT, 2 hours 40 minutes before

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Local storm report, May 24, 1:10 PM CDT, 2 hours 34 minutes before

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Local storm report, May 24, 1:20 PM CDT, 2 hours 24 minutes before

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Special weather statement, May 24, 1:54 PM CDT, 1 hour 50 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
May 23, 10:07 PM CDT	Rip Current Statement	HGX	Brazoria, Galveston, Matagorda	65 hr
May 24, 9:28 AM CDT	River Flood Warning	HGX	Lavaca	31 hr
May 24, 10:19 AM CDT	Areal Flood Advisory	HGX	Brazoria, Fort Bend, Harris, Montgomery, Waller	116 min
May 24, 11:14 AM CDT	Areal Flood Advisory	HGX	Harris, Montgomery	3 hr
May 24, 11:40 AM CDT	Special Marine Warning	HGX		50 min
May 24, 11:42 AM CDT	Areal Flood Advisory	HGX	Brazoria, Fort Bend, Galveston, Harris	2 hr
May 24, 12:42 PM CDT	Flash Flood Warning	HGX	Harris, Montgomery	3 hr
May 24, 1:54 PM CDT	Special Weather Statement	HGX	Brazoria	51 min
May 24, 2:50 PM CDT	Areal Flood Advisory	HGX	Brazoria	115 min
May 24, 5:47 PM CDT	Flash Flood Warning	HGX	Austin, Colorado, Washington	4 hr
May 24, 6:18 PM CDT	Special Weather Statement	HGX	Austin	42 min

Nearby

Areal Flood Warnings in Texas, 2021 Every areal flood warning 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.