Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 81, NWS Shreveport, LA

April 9, 2021Angelina County, Nacogdoches County, San Augustine County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 9, 2021, 8:08 PM CDT for Angelina County, Nacogdoches County, San Augustine County, Texas. It was in force for 42 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 9, 2021, 8:08 PM CDT (01:08 UTC)
Expired: Apr 9, 2021, 8:50 PM CDT
In force: 42 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Shreveport radar (KSHV), 137 km from the middle of the area, began a volume at 01:11 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 9, 5:32 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 1.1 hours before the alert went out and 144 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: 148 J/kg
Mixed-layer CIN: -321 J/kg
Mixed-layer LCL: 2441 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 329 m²/s²
0-3 km storm-relative helicity: 421 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

131 
WUUS54 KSHV 100108
SVRSHV
TXC005-347-405-100215-
/O.NEW.KSHV.SV.W.0081.210410T0108Z-210410T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
808 PM CDT Fri Apr 9 2021

The National Weather Service in Shreveport has issued a

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

* Until 915 PM CDT.

* At 808 PM CDT, a severe thunderstorm was located near Lufkin,
  moving northeast at 30 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...
  Lufkin, Hudson, Huntington, Melrose, Macune, Etoile, Woden,
  Martinsville, Chireno, Denning and Homer.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3123 9471 3134 9478 3166 9442 3142 9412
TIME...MOT...LOC 0108Z 236DEG 27KT 3132 9465 

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

50

1 follow-up statement

166 
WWUS54 KSHV 100150
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
850 PM CDT Fri Apr 9 2021

TXC005-347-405-100159-
/O.CAN.KSHV.SV.W.0081.000000T0000Z-210410T0215Z/
Nacogdoches TX-Angelina TX-San Augustine TX-
850 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN NACOGDOCHES...
CENTRAL ANGELINA AND NORTHWESTERN SAN AUGUSTINE COUNTIES IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
eastern Texas.

LAT...LON 3123 9471 3134 9478 3166 9442 3142 9412
TIME...MOT...LOC 0147Z 236DEG 27KT 3150 9435 

$$

19

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 7:05 PM CDT	Special Weather Statement	SHV	Nacogdoches	40 min
Apr 9, 7:07 PM CDT	Special Weather Statement	SHV	Gregg	53 min
Apr 9, 7:11 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Rusk	27 min
Apr 9, 7:35 PM CDT	Special Weather Statement	SHV	Shelby	40 min
Apr 9, 8:36 PM CDT	Special Weather Statement	SHV	Panola, Shelby	54 min
Apr 9, 10:02 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Nacogdoches, Rusk	58 min
Apr 9, 10:48 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River	42 min
Apr 9, 10:50 PM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Rusk, San Augustine, Shelby	55 min
Apr 9, 11:12 PM CDT	Special Weather Statement	SHV	Camp, Cass, Franklin, Morris, Titus	48 min
Apr 9, 11:18 PM CDT	Severe Thunderstorm Warning	SHV	Bowie	42 min
Apr 9, 11:42 PM CDT	Severe Thunderstorm Warning	SHV	Camp, Cass, Franklin, Gregg, Harrison, Marion and 3 more	63 min
Apr 9, 11:47 PM CDT	Severe Thunderstorm Warning	SHV	Camp, Franklin, Gregg, Smith, Upshur, Wood	43 min
Apr 10, 1:05 AM CDT	Special Weather Statement	SHV	Harrison	40 min
Apr 10, 1:28 AM CDT	Special Weather Statement	SHV	Cherokee	47 min
Apr 10, 1:54 AM CDT	Special Weather Statement	SHV	Nacogdoches	51 min
Apr 10, 1:55 AM CDT	Special Weather Statement	SHV	Shelby	50 min
Apr 10, 2:07 AM CDT	Special Weather Statement	SHV	Angelina	38 min
Apr 10, 2:38 AM CDT	Special Weather Statement	SHV	San Augustine	52 min
Apr 10, 2:50 AM CDT	Special Weather Statement	SHV	San Augustine	40 min
Apr 10, 3:04 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine	56 min

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.