Alert archive / Arkansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 17, NWS Tulsa, OK

March 17, 2021Benton County, Washington County, Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at Mar 17, 2021, 4:09 PM CDT for Benton County, Washington County, Arkansas. It was in force for 13 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, 4:09 PM CDT (21:09 UTC)
Expired: Mar 17, 2021, 4:22 PM CDT
In force: 13 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Benton County, AR, Washington County, AR

The radar

The Western Arkansas radar (KSRX), 113 km from the middle of the area, began a volume at 21:09 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, 4:10 PM CDT	HAIL 1	1 S Oak Grove, AR	DELAYED REPORT: RESTAURANT EMPLOYEE REPORTS UP TO 1 HAIL NEAR THE INTERSECTION OF HIGHWAY 412 AND I-49. HAIL ALSO COVERED THE GROUND.

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, 2:00 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 9.2 hours before the alert went out and 73 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: 102 J/kg
Mixed-layer CIN: -235 J/kg
Mixed-layer LCL: 956 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 236 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

As transmitted.

425 
WUUS54 KTSA 172109
SVRTSA
ARC007-143-172200-
/O.NEW.KTSA.SV.W.0017.210317T2109Z-210317T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
409 PM CDT Wed Mar 17 2021

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Northeastern Benton County in northwestern Arkansas...
  North central Washington County in northwestern Arkansas...

* Until 500 PM CDT.

* At 408 PM CDT, a severe thunderstorm was located over Tontitown,
  moving north at 40 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 in or near the path include...
  Fayetteville...                   Springdale...
  Rogers...                         Bentonville...
  Lowell...                         Pea Ridge...
  Tontitown...                      Bethel Heights...
  Cave Springs...                   Gateway...
  Johnson...                        Elm Springs...
  Avoca...                          Hill Top...
  Walnut Hill...                    Monte Ne...
  Wheeler...                        Larue...

This includes Interstate 49 between mile markers 64 and 93.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A Tornado Watch remains in effect until 800 PM CDT for northwestern
Arkansas.

LAT...LON 3607 9412 3610 9430 3650 9421 3650 9387
      3646 9387
TIME...MOT...LOC 2108Z 191DEG 33KT 3618 9421 

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

1 follow-up statement

571 
WWUS54 KTSA 172122
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
422 PM CDT Wed Mar 17 2021

ARC007-143-172132-
/O.CAN.KTSA.SV.W.0017.000000T0000Z-210317T2200Z/
Benton AR-Washington AR-
422 PM CDT Wed Mar 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BENTON AND NORTH
CENTRAL WASHINGTON 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 Tornado Watch remains in effect until 800 PM CDT for northwestern
Arkansas.

LAT...LON 3607 9412 3610 9430 3650 9421 3650 9387
      3646 9387
TIME...MOT...LOC 2121Z 191DEG 33KT 3631 9418 

$$
Snider

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 17, 1:33 AM CDT	Severe Thunderstorm Warning	TSA	Sebastian	42 min
Mar 17, 1:52 AM CDT	Special Weather Statement	TSA	Sebastian	23 min
Mar 17, 2:37 AM CDT	Severe Thunderstorm Warning	TSA	Franklin, Sebastian	38 min
Mar 17, 3:14 AM CDT	Severe Thunderstorm Warning	TSA	Franklin, Sebastian	33 min
Mar 17, 6:33 AM CDT	Special Weather Statement	TSA	Benton, Crawford, Franklin, Sebastian, Washington	42 min
Mar 17, 3:10 PM CDT	Special Weather Statement	TSA	Washington	35 min
Mar 17, 3:31 PM CDT	Severe Thunderstorm Warning	TSA	Benton	13 min
Mar 17, 4:02 PM CDT	Special Weather Statement	TSA	Benton	28 min
Mar 17, 4:40 PM CDT	Special Weather Statement	TSA	Benton	35 min
Mar 17, 4:48 PM CDT	Severe Thunderstorm Warning	TSA	Benton	27 min
Mar 17, 5:23 PM CDT	Special Weather Statement	TSA	Benton	37 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 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.