Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 10, NWS Shreveport, LA

March 17, 20215 counties in Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Mar 17, 2021, 6:12 AM CDT for 5 counties in Texas. It was in force for 63 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 17, 2021, 6:12 AM CDT (11:12 UTC)
Expired: Mar 17, 2021, 7:15 AM CDT
In force: 63 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Camp County, TX, Franklin County, TX, Smith County, TX, Titus County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 148 km from the middle of the area, began a volume at 11:12 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.

What was reported inside it

Time	Report	Where	Remark
Mar 17, 6:45 AM CDT	TSTM WND DMG	7 S Mount Vernon, TX	TREES REPORTED DOWN NEAR THE LAKE HWY 37 AND FM 900 AREA BY THE LAKE.
Mar 17, 6:45 AM CDT	HAIL 0.7	6 Ese Mineola, TX	DIME SIZE HAIL REPORTED IN HOARD.
Mar 17, 6:48 AM CDT	HAIL 1	Mount Vernon, TX	PEA TO QUARTER SIZE HAIL IN MOUNT VERNON.
Mar 17, 6:50 AM CDT	HAIL 1.75	Mount Vernon, TX	STORM SPOTTER REPORTS GOLF BALL SIZE HAIL IN DOWNTOWN AREA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Mar 17, 4:37 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 11.2 hours before the alert went out and 156 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: 805 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1449 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.8

Open this sounding in Storm Lab

The text

As transmitted.

842 
WUUS54 KSHV 171112
SVRSHV
TXC063-159-423-449-499-171215-
/O.NEW.KSHV.SV.W.0010.210317T1112Z-210317T1215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
612 AM CDT Wed Mar 17 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Northwestern Smith County in northeastern Texas...
  Franklin County in northeastern Texas...
  Wood County in northeastern Texas...
  West central Titus County in northeastern Texas...
  Western Camp County in northeastern Texas...

* Until 715 AM CDT.

* At 611 AM CDT, severe thunderstorms were located along a line
  extending from East Tawakoni to near Canton to near Purtis Creek
  State Park, moving northeast at 55 mph.

  HAZARD...70 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Mineola, Winnsboro, Hagansport, Lindale, Mount Vernon, Quitman,
  Hoard, Scroggins, Pleasant Grove, Newsome, Purley, Hainesville,
  Golden, Forest Hill, Alba, Yantis, Red Springs, Perryville,
  Hopewell and Monticello.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3296 9531 3338 9531 3336 9522 3304 9507
      3290 9512 3290 9515 3279 9515 3244 9529
      3247 9559 3269 9559 3272 9564 3296 9566
TIME...MOT...LOC 1111Z 232DEG 46KT 3289 9596 3260 9582 3235 9593 

HAIL...0.75IN
WIND...70MPH
 
$$

Thorne

1 follow-up statement

763 
WWUS54 KSHV 171158
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
658 AM CDT Wed Mar 17 2021

TXC063-159-423-449-499-171215-
/O.CON.KSHV.SV.W.0010.000000T0000Z-210317T1215Z/
Smith TX-Franklin TX-Wood TX-Titus TX-Camp TX-
658 AM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM CDT
FOR NORTHWESTERN SMITH...FRANKLIN...EASTERN WOOD...WEST CENTRAL TITUS
AND WESTERN CAMP COUNTIES...

At 658 AM CDT, severe thunderstorms were located along a line
extending from 11 miles east of Cooper Lake Park South Sulphur to
Winnsboro to near Hainesville, moving east at 55 mph.

HAZARD...70 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Winnsboro, Lindale, Mount Vernon, Hoard, Scroggins, Newsome, Purley,
Hainesville, Red Springs, Perryville, Hopewell, Monticello and
Cypress.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3246 9552 3294 9534 3296 9534 3296 9531
      3329 9531 3332 9520 3304 9507 3290 9512
      3290 9515 3279 9515 3244 9529
TIME...MOT...LOC 1158Z 270DEG 46KT 3324 9543 3295 9529 3270 9541 

HAIL...0.88IN
WIND...70MPH
 
$$

Thorne

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 1:30 AM CDT	Special Weather Statement	SHV	Marion	45 min
Mar 17, 2:45 AM CDT	Lake Wind Advisory	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	40 hr
Mar 17, 6:49 AM CDT	Special Weather Statement	SHV	Cherokee, Smith	41 min
Mar 17, 6:56 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Franklin, Morris, Red River, Titus	49 min
Mar 17, 7:08 AM CDT	Tornado Warning	SHV	Bowie, Cass, Morris, Red River, Titus	37 min
Mar 17, 7:12 AM CDT	Special Weather Statement	SHV	Camp, Gregg, Morris, Upshur	48 min
Mar 17, 7:32 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Gregg, Harrison, Marion, Panola, Rusk and 2 more	58 min
Mar 17, 7:36 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass, Morris	54 min
Mar 17, 7:43 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Nacogdoches, Panola, Rusk, Smith	62 min
Mar 17, 7:59 AM CDT	Special Weather Statement	SHV	Cass	31 min
Mar 17, 8:27 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Cherokee, Nacogdoches, Rusk, Shelby	63 min
Mar 17, 8:34 AM CDT	Severe Thunderstorm Warning	SHV	Cass, Gregg, Harrison, Marion, Panola, Rusk	56 min
Mar 17, 8:40 AM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Panola, Rusk, Shelby	44 min
Mar 17, 9:29 AM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Panola, Rusk, San Augustine, Shelby	61 min
Mar 17, 11:42 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Sabine, San Augustine	48 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.