Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 5, NWS Shreveport, LA

February 28, 2021McCurtain County, Oklahoma

NWS Shreveport, LA issued this severe thunderstorm warning at Feb 28, 2021, 12:57 PM CST for McCurtain County, Oklahoma. It was in force for 17 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: Feb 28, 2021, 12:57 PM CST (18:57 UTC)
Expired: Feb 28, 2021, 1:14 PM CST
In force: 17 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County McCurtain County, OK

The radar

The Western Arkansas radar (KSRX), 117 km from the middle of the area, began a volume at 18:58 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
Feb 28, 10:43 AM CST	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 7.0 hours before the alert went out and 228 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: 458 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 573 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 321 m²/s²
0-3 km storm-relative helicity: 414 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted.

719 
WUUS54 KSHV 281857
SVRSHV
OKC089-281945-
/O.NEW.KSHV.SV.W.0005.210228T1857Z-210228T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
1257 PM CST Sun Feb 28 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Northern McCurtain County in southeastern Oklahoma...

* Until 145 PM CST.

* At 1256 PM CST, a severe thunderstorm was located 7 miles northeast
  of Fort Towson, or 18 miles northeast of Hugo, moving northeast at
  50 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...
  Rufe, Smithville, Slim, Bethel, Ringold, Mount Herman and Sherwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3430 9449 3405 9516 3424 9515 3425 9505
      3433 9504 3451 9474 3451 9464
TIME...MOT...LOC 1856Z 239DEG 41KT 3412 9521 

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

20

1 follow-up statement

736 
WWUS54 KSHV 281914
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
114 PM CST Sun Feb 28 2021

OKC089-281923-
/O.CAN.KSHV.SV.W.0005.000000T0000Z-210228T1945Z/
McCurtain OK-
114 PM CST Sun Feb 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MCCURTAIN COUNTY 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 600 PM CST for
southeastern Oklahoma.

LAT...LON 3430 9449 3405 9516 3424 9515 3425 9505
      3433 9504 3451 9474 3451 9464
TIME...MOT...LOC 1912Z 239DEG 41KT 3422 9500 

$$

20

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 27, 9:09 PM CST	Dense Fog Advisory	SHV	McCurtain	5 hr
Feb 28, 12:51 PM CST	Special Weather Statement	SHV	McCurtain	39 min
Feb 28, 1:20 PM CST	Special Weather Statement	SHV	McCurtain	25 min
Feb 28, 1:34 PM CST	Severe Thunderstorm Warning	SHV	McCurtain	26 min

Nearby

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.