Alert archive / Arkansas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 13, NWS Tulsa, OK

January 10, 2020Benton County, Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at Jan 10, 2020, 3:39 PM CST for Benton County, Arkansas. It was in force for 36 min. 3 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: Jan 10, 2020, 3:39 PM CST (21:39 UTC)
Expired: Jan 10, 2020, 4:15 PM CST
In force: 36 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Benton County, AR

The radar

The Western Arkansas radar (KSRX), 110 km from the middle of the area, began a volume at 21:38 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
Jan 10, 4:10 PM CST	HAIL 1	Siloam Springs, AR
Jan 10, 4:22 PM CST	HAIL 1.75	2 Se Decatur, AR	SIZE ESTIMATED FROM PHOTO ON SOCIAL MEDIA.
Jan 10, 4:24 PM CST	HAIL 1	2 E Siloam Springs, AR	HAIL OBSERVED EAST OF SILOAM SPRINGS OFF OF AIRPORT ROAD.

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
Jan 10, 10:42 AM CST	Tornado Watch	SPC	10 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 9.7 hours before the alert went out and 82 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: 619 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 540 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

821 
WUUS54 KTSA 102139
SVRTSA
ARC007-102215-
/O.NEW.KTSA.SV.W.0013.200110T2139Z-200110T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
339 PM CST Fri Jan 10 2020

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Central Benton County in northwestern Arkansas...

* Until 415 PM CST.

* At 339 PM CST, a severe thunderstorm was located over Siloam
  Springs, moving northeast at 45 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations in or near the path include...
  Rogers...                         Bentonville...
  Siloam Springs...                 Bella Vista...
  Pea Ridge...                      Gentry...
  Cave Springs...                   Decatur...
  Highfill...                       Springtown...
  Northwest Arkansas Regional Air...
  Hiwasse...
  Miller...                         Centerton...
  Avoca...                          Lake Francis...
  Hill Top...                       Fairmount...
  Walnut Hill...                    Vaughn...

This includes Interstate 49 between mile markers 82 and 93.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

&&

A Tornado Watch remains in effect until 600 PM CST for northwestern
Arkansas...and northeastern Oklahoma.

LAT...LON 3644 9393 3621 9431 3622 9433 3620 9434
      3610 9450 3610 9453 3616 9456 3624 9458
      3650 9428 3650 9404
TIME...MOT...LOC 2139Z 225DEG 38KT 3620 9452 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 10, 3:12 PM CST	Tornado Warning	TSA	Benton	28 min
Jan 10, 3:25 PM CST	Severe Thunderstorm Warning	TSA	Benton	50 min
Jan 10, 3:49 PM CST	Severe Thunderstorm Warning	TSA	Benton, Washington	41 min
Jan 10, 3:50 PM CST	Areal Flood Advisory	TSA	Benton, Carroll, Madison, Washington	3 hr
Jan 10, 4:02 PM CST	Winter Weather Advisory	TSA	Benton, Carroll, Madison, Washington	23 hr
Jan 10, 4:12 PM CST	Severe Thunderstorm Warning	TSA	Benton	48 min
Jan 10, 4:24 PM CST	Severe Thunderstorm Warning	TSA	Benton, Crawford, Franklin, Washington	51 min
Jan 10, 5:01 PM CST	Tornado Warning	TSA	Carroll, Madison, Washington	44 min
Jan 10, 5:10 PM CST	Severe Thunderstorm Warning	TSA	Benton, Carroll, Madison, Washington	48 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2020 Every severe thunderstorm warning in 2020

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.