Alert archive / Arkansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 13, NWS Shreveport, LA

March 17, 20215 counties in Arkansas; Bowie County, Cass County, Morris County, Texas; McCurtain County, Oklahoma

NWS Shreveport, LA issued this severe thunderstorm warning at Mar 17, 2021, 7:36 AM CDT for 5 counties in Arkansas; Bowie County, Cass County, Morris County, Texas; McCurtain County, Oklahoma. It was in force for 54 min. 1 report 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, 7:36 AM CDT (12:36 UTC)
Expired: Mar 17, 2021, 8:30 AM CDT
In force: 54 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Hempstead County, AR, Howard County, AR, Little River County, AR, Miller County, AR, Sevier County, AR, McCurtain County, OK, Bowie County, TX, Cass County, TX, Morris County, TX

The radar

The Shreveport radar (KSHV), 149 km from the middle of the area, began a volume at 12:38 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, 8:24 AM CDT	HAIL 0.88	Maud, TX	NICKEL SIZE HAIL REPORTED IN MAUD.

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 12:00Z, 0.6 hours before the alert went out and 148 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: 1417 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 682 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 328 m²/s²
0-3 km storm-relative helicity: 340 m²/s²
Significant tornado parameter: 2.7
Supercell composite: 14.5

Open this sounding in Storm Lab

The text

As transmitted.

321 
WUUS54 KSHV 171236
SVRSHV
ARC057-061-081-091-133-OKC089-TXC037-067-343-171330-
/O.NEW.KSHV.SV.W.0013.210317T1236Z-210317T1330Z/

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

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Little River County in southwestern Arkansas...
  Hempstead County in southwestern Arkansas...
  Northern Miller County in southwestern Arkansas...
  Southern Sevier County in southwestern Arkansas...
  Southeastern Howard County in southwestern Arkansas...
  Southeastern McCurtain County in southeastern Oklahoma...
  Northern Cass County in northeastern Texas...
  Bowie County in northeastern Texas...
  Northeastern Morris County in northeastern Texas...

* Until 830 AM CDT.

* At 736 AM CDT, severe thunderstorms were located along a line
  extending from near Wilton to 6 miles east of Naples, moving
  northeast at 55 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  Texarkana, Wake Village, Ashdown, Nashville, New Boston, Mineral
  Springs, Foreman, Nash, Hooks, De Kalb, Naples, Redwater, Maud, Red
  Lick, Fouke, Lockesburg, Wilton, Blevins, Tollette and Fulton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3401 9382 3398 9363 3396 9362 3395 9353
      3395 9349 3322 9387 3313 9473 3368 9459
      3367 9456 3365 9459 3364 9459 3366 9455
      3363 9457 3363 9449 3385 9448 3400 9414
      3409 9382
TIME...MOT...LOC 1236Z 238DEG 46KT 3378 9422 3321 9456 

HAIL...1.00IN
WIND...70MPH
 
$$

Thorne

1 follow-up statement

269 
WWUS54 KSHV 171315
SVSSHV

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

OKC089-TXC343-171324-
/O.CAN.KSHV.SV.W.0013.000000T0000Z-210317T1330Z/
McCurtain OK-Morris TX-
815 AM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MCCURTAIN AND
NORTHEASTERN MORRIS COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 AM CDT for
southwestern Arkansas...and northeastern Texas.

LAT...LON 3401 9382 3398 9363 3396 9362 3395 9353
      3395 9349 3322 9387 3316 9444 3332 9440
      3341 9435 3401 9412 3409 9382
TIME...MOT...LOC 1314Z 238DEG 46KT 3403 9373 3346 9408 

$$

ARC057-061-081-091-133-TXC037-067-171330-
/O.CON.KSHV.SV.W.0013.000000T0000Z-210317T1330Z/
Little River AR-Hempstead AR-Miller AR-Sevier AR-Howard AR-Cass TX-
Bowie TX-
815 AM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 AM CDT
FOR SOUTHEASTERN LITTLE RIVER...HEMPSTEAD...NORTHERN MILLER...
SOUTHEASTERN SEVIER...SOUTHEASTERN HOWARD...NORTHEASTERN CASS AND
SOUTHEASTERN BOWIE COUNTIES...

At 814 AM CDT, severe thunderstorms were located along a line
extending from near Murfreesboro to Texarkana, moving northeast at 55
mph.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Texarkana, Wake Village, Ashdown, Nashville, Mineral Springs, Nash,
Hooks, Redwater, Maud, Red Lick, Fouke, Wilton, Blevins, Tollette,
Fulton, Washington, Ogden, Ben Lomond, Corinth and Mandeville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3401 9382 3398 9363 3396 9362 3395 9353
      3395 9349 3322 9387 3316 9444 3332 9440
      3341 9435 3401 9412 3409 9382
TIME...MOT...LOC 1314Z 238DEG 46KT 3403 9373 3346 9408 

HAIL...1.00IN
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, 12:14 AM CDT	Special Weather Statement	SHV	Union	46 min
Mar 17, 12:21 AM CDT	Severe Thunderstorm Warning	SHV	Union	39 min
Mar 17, 2:01 AM CDT	Special Weather Statement	SHV	Columbia, Lafayette	44 min
Mar 17, 2:41 AM CDT	Special Weather Statement	SHV	Miller	49 min
Mar 17, 2:45 AM CDT	Lake Wind Advisory	SHV	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	40 hr
Mar 17, 8:34 AM CDT	Severe Thunderstorm Warning	SHV	Lafayette, Miller	56 min
Mar 17, 8:37 AM CDT	Special Weather Statement	SHV	Hempstead, Lafayette, Miller, Nevada	53 min
Mar 17, 9:26 AM CDT	Special Weather Statement	SHV	Columbia, Lafayette, Nevada	64 min
Mar 17, 2:16 PM CDT	Severe Thunderstorm Warning	SHV	Union	44 min
Mar 17, 2:32 PM CDT	Tornado Warning	SHV	Union	43 min
Mar 17, 1:30 AM CDT	Special Weather Statement	SHV	Marion	45 min
Mar 17, 6:12 AM CDT	Severe Thunderstorm Warning	SHV	Camp, Franklin, Smith, Titus, Wood	63 min
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, 7:43 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, 8:40 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
Mar 16, 11:48 PM CDT	Special Weather Statement	SHV	McCurtain	42 min
Mar 17, 12:43 AM CDT	Special Weather Statement	SHV	McCurtain	17 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2021 Severe Thunderstorm Warnings in Texas, 2021 Severe Thunderstorm Warnings in Oklahoma, 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.