Alert archive / Arkansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 196, NWS Shreveport, LA

October 11, 2021Howard County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at Oct 11, 2021, 1:03 AM CDT for Howard County, Arkansas. It was in force for 27 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: Oct 11, 2021, 1:03 AM CDT (06:03 UTC)
Expired: Oct 11, 2021, 1:30 AM CDT
In force: 27 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Howard County, AR

The radar

The Western Arkansas radar (KSRX), 120 km from the middle of the area, began a volume at 06:02 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
Oct 10, 11:07 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 6.1 hours before the alert went out and 198 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: 193 J/kg
Mixed-layer CIN: -245 J/kg
Mixed-layer LCL: 1467 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

183 
WUUS54 KSHV 110603
SVRSHV
ARC061-110630-
/O.NEW.KSHV.SV.W.0196.211011T0603Z-211011T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
103 AM CDT Mon Oct 11 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Northern Howard County in southwestern Arkansas...

* Until 130 AM CDT.

* At 103 AM CDT, a severe thunderstorm was located near Grannis, or
  10 miles west of Umpire, moving east 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...
  Umpire, Athens and Burg. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 400 AM CDT for southwestern
Arkansas.

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

A Tornado Watch remains in effect until 400 AM CDT for southwestern
Arkansas.

&&

LAT...LON 3435 9394 3427 9394 3426 9392 3419 9392
      3419 9391 3417 9391 3417 9410 3418 9409
      3419 9410 3419 9424 3427 9424 3427 9426
      3435 9426
TIME...MOT...LOC 0603Z 261DEG 44KT 3424 9423 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

44

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 11, 12:26 AM CDT	Severe Thunderstorm Warning	SHV	Howard, Little River, Miller, Sevier	64 min
Oct 11, 1:29 AM CDT	Severe Thunderstorm Warning	SHV	Howard, Sevier	31 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.