Alert archive / Texas / Mesoscale Discussions in 2023

Mesoscale Discussion 587

April 21, 20237 parishes in Louisiana; 23 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2023, 1:30 AM CDT for 7 parishes in Louisiana; 23 counties in Texas. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Apr 21, 2023, 1:30 AM CDT (06:30 UTC)
Expired: Apr 21, 2023, 3:00 AM CDT
In force: 90 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 156

All 30 counties

Acadia Parish, LA, Allen Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Vermilion Parish, LA, Aransas County, TX, Bee County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Fort Bend County, TX, Galveston County, TX, Goliad County, TX, Harris County, TX, Jackson County, TX, Jefferson County, TX, Karnes County, TX, Lavaca County, TX, Live Oak County, TX, Matagorda County, TX, Orange County, TX, Refugio County, TX, San Patricio County, TX, Victoria County, TX, Wharton County, TX, Wilson County, TX

The radar

The Houston radar (KHGX), 35 km from the middle of the area, began a volume at 06:34 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 157Apr 21, 1:55 AM CDT

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 20, 8:18 PM CDT	Severe Thunderstorm Watch	SPC	Beauregard, Calcasieu, Cameron, De Soto, Natchitoches, Red River and 2 more	9 hr
Apr 20, 10:37 PM CDT	Mesoscale Discussion	SPC	Allen, Beauregard, Calcasieu, De Soto, Sabine, Vernon	83 min
Apr 21, 1:35 PM CDT	Mesoscale Discussion	SPC	Caldwell, East Carroll, Franklin, Grant, Jackson, Madison and 8 more	115 min
Apr 20, 7:14 PM CDT	Mesoscale Discussion	SPC	Austin, Bastrop, Brazos, Burleson, Caldwell, Colorado and 22 more	91 min
Apr 21, 1:54 AM CDT	Severe Thunderstorm Watch	SPC	Aransas, Atascosa, Bee, Brazoria, Calhoun, Colorado and 12 more	4 hr
Apr 21, 2:12 PM CDT	Mesoscale Discussion	SPC	Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 6 more	2 hr
Apr 21, 2:36 PM CDT	Severe Thunderstorm Watch	SPC	Brooks, Cameron, Hidalgo, Jim Hogg, Kenedy, Starr and 2 more	3 hr

Nearby

Mesoscale Discussions in Texas, 2023 Mesoscale Discussions in Louisiana, 2023 Every mesoscale discussion in 2023

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.