Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 85, NWS Houston/Galveston, TX

May 25, 2020Brazoria County, Galveston County, Harris County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 25, 2020, 4:16 AM CDT for Brazoria County, Galveston County, Harris County, Texas. It was in force for 18 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 25, 2020, 4:16 AM CDT (09:16 UTC)
Expired: May 25, 2020, 4:34 AM CDT
In force: 18 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Brazoria County, TX, Galveston County, TX, Harris County, TX

The radar

The Houston radar (KHGX), 13 km from the middle of the area, began a volume at 09:20 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 00:00Z, 9.3 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: 1693 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1009 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at May 25, 3:45 AM CDT, 31 minutes earlier.

Area forecast discussion, May 25, 3:45 AM CDT, 31 minutes before

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In the hours before

Local storm report, May 25, 2:21 AM CDT, 1 hour 55 minutes before

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Special weather statement, May 25, 2:36 AM CDT, 1 hour 40 minutes before

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Special weather statement, May 25, 2:50 AM CDT, 1 hour 26 minutes before

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Special weather statement, May 25, 2:59 AM CDT, 1 hour 17 minutes before

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Special weather statement, May 25, 3:35 AM CDT, 41 minutes before

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Special weather statement, May 25, 4:03 AM CDT, 13 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 24, 7:12 PM CDT	Areal Flood Advisory	HGX	Chambers, Harris, Liberty	2 hr
May 24, 7:28 PM CDT	Areal Flood Advisory	HGX	Brazoria, Chambers, Fort Bend, Harris	2 hr
May 24, 8:10 PM CDT	Flash Flood Warning	HGX	Harris	65 min
May 24, 8:29 PM CDT	Special Marine Warning	HGX		91 min
May 24, 8:50 PM CDT	Areal Flood Advisory	HGX	Brazoria, Galveston, Harris	90 min
May 24, 10:47 PM CDT	Small Craft Advisory	HGX		8 hr
May 25, 12:35 AM CDT	Special Marine Warning	HGX		115 min
May 25, 12:48 AM CDT	Special Weather Statement	HGX	Colorado, Jackson	42 min
May 25, 1:19 AM CDT	Special Weather Statement	HGX	Matagorda	41 min
May 25, 1:34 AM CDT	Special Weather Statement	HGX	Wharton	41 min
May 25, 2:05 AM CDT	Special Marine Warning	HGX		25 min
May 25, 2:05 AM CDT	Special Weather Statement	HGX	Matagorda	40 min
May 25, 2:27 AM CDT	Special Marine Warning	HGX		2 hr
May 25, 2:36 AM CDT	Special Weather Statement	HGX	Wharton	24 min
May 25, 2:50 AM CDT	Special Weather Statement	HGX	Matagorda	10 min
May 25, 2:59 AM CDT	Special Weather Statement	HGX	Brazoria	31 min
May 25, 3:35 AM CDT	Special Weather Statement	HGX	Brazoria	25 min
May 25, 3:53 AM CDT	Special Marine Warning	HGX		67 min
May 25, 4:03 AM CDT	Special Weather Statement	HGX	Brazoria	27 min
May 25, 4:23 AM CDT	Special Marine Warning	HGX		67 min
May 25, 6:14 AM CDT	River Flood Warning	HGX	Polk, San Jacinto, Trinity, Walker	18 hr
May 25, 3:34 PM CDT	Small Craft Advisory	HGX		18 hr
May 25, 3:47 PM CDT	Rip Current Statement	HGX	Brazoria, Galveston, Matagorda	8 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2020 Every severe thunderstorm warning in 2020

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.