Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 46, NWS Shreveport, LA

April 7, 20214 counties in Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 7, 2021, 4:09 PM CDT for 4 counties in Texas. It was in force for 51 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 7, 2021, 4:09 PM CDT (21:09 UTC)
Expired: Apr 7, 2021, 5:00 PM CDT
In force: 51 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Angelina County, TX, Nacogdoches County, TX, Sabine County, TX, San Augustine County, TX

The radar

The Shreveport radar (KSHV), 123 km from the middle of the area, began a volume at 21:10 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 7, 12:38 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 9.2 hours before the alert went out and 130 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: 532 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 506 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 267 m²/s²
0-3 km storm-relative helicity: 433 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

457 
WUUS54 KSHV 072109
SVRSHV
TXC005-347-403-405-072200-
/O.NEW.KSHV.SV.W.0046.210407T2109Z-210407T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
409 PM CDT Wed Apr 7 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Southeastern Nacogdoches County in eastern Texas...
  North central Angelina County in eastern Texas...
  Central San Augustine County in eastern Texas...
  Northwestern Sabine County in eastern Texas...

* Until 500 PM CDT.

* At 409 PM CDT, a severe thunderstorm was located near Melrose, or
  15 miles southeast of Nacogdoches, moving southeast at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Melrose, Macune, Etoile, Woden, Chireno, Broaddus, Denning and
  Chinaquapin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for eastern Texas.

A Tornado Watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted, act quickly and move to a
place of safety inside a sturdy structure such as a basement or small
interior room.

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3144 9462 3164 9448 3145 9400 3121 9414
TIME...MOT...LOC 2109Z 299DEG 23KT 3150 9444 

HAIL...1.00IN
WIND...60MPH
 
$$

05

1 follow-up statement

674 
WWUS54 KSHV 072138
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
438 PM CDT Wed Apr 7 2021

TXC005-072147-
/O.CAN.KSHV.SV.W.0046.000000T0000Z-210407T2200Z/
Angelina TX-
438 PM CDT Wed Apr 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL ANGELINA COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 800 PM CDT for eastern Texas.

LAT...LON 3139 9444 3155 9427 3145 9400 3121 9414
TIME...MOT...LOC 2137Z 299DEG 23KT 3141 9425 

$$

TXC347-403-405-072200-
/O.CON.KSHV.SV.W.0046.000000T0000Z-210407T2200Z/
Nacogdoches TX-San Augustine TX-Sabine TX-
438 PM CDT Wed Apr 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR EAST CENTRAL NACOGDOCHES...CENTRAL SAN AUGUSTINE AND NORTHWESTERN
SABINE COUNTIES...

At 437 PM CDT, a severe thunderstorm was located near Macune, or 26
miles north of Ebenezer, moving southeast at 25 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Macune, Broaddus, Denning and Chinaquapin. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for eastern Texas.

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3139 9444 3155 9427 3145 9400 3121 9414
TIME...MOT...LOC 2137Z 299DEG 23KT 3141 9425 

HAIL...1.00IN
WIND...60MPH
 
$$

05

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 7, 1:22 PM CDT	Severe Thunderstorm Warning	SHV	Sabine, San Augustine, Shelby	38 min
Apr 7, 1:32 PM CDT	Special Weather Statement	SHV	Camp, Upshur	43 min
Apr 7, 2:12 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Marion, Upshur	63 min
Apr 7, 2:30 PM CDT	Special Weather Statement	SHV	Cherokee	45 min
Apr 7, 4:02 PM CDT	Special Weather Statement	SHV	Angelina, San Augustine, Shelby	43 min
Apr 7, 4:50 PM CDT	Special Weather Statement	SHV	San Augustine	40 min
Apr 7, 4:58 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine	62 min
Apr 7, 5:36 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	39 min
Apr 7, 6:25 PM CDT	Areal Flood Advisory	SHV	Angelina, Nacogdoches, Sabine, San Augustine	3 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2021 Every severe thunderstorm 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.