Alert archive / Arkansas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 9, NWS Shreveport, LA

March 17, 2021Union County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at Mar 17, 2021, 12:21 AM CDT for Union County, Arkansas. It was in force for 39 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, 12:21 AM CDT (05:21 UTC)
Expired: Mar 17, 2021, 1:00 AM CDT
In force: 39 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Union County, AR

The radar

The Shreveport radar (KSHV), 158 km from the middle of the area, began a volume at 05:22 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, 12:38 AM CDT	HAIL 0.88	El Dorado, AR	DIME TO NICKEL SIZE HAIL REPORTED BY EL DORADO PD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 5.4 hours before the alert went out and 149 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: 805 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1449 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.8

Open this sounding in Storm Lab

The text

As transmitted.

547 
WUUS54 KSHV 170521
SVRSHV
ARC139-170600-
/O.NEW.KSHV.SV.W.0009.210317T0521Z-210317T0600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
1221 AM CDT Wed Mar 17 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Central Union County in south central Arkansas...

* Until 100 AM CDT.

* At 1220 AM CDT, severe thunderstorms were located along a line
  extending from near Wesson to 7 miles southwest of Lawson, moving
  northeast at 45 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...
  El Dorado, Norphlet, Calion, Urbana, Lawson, Wesson, Moro Bay State
  Park, Hew Hope, Newell, Pigeon Hill, Hillsboro, Three Creeks,
  Catesville and Kenova.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3306 9252 3305 9296 3336 9269 3336 9255
      3333 9252 3332 9253 3333 9250 3332 9249
      3333 9248 3332 9246 3329 9247 3327 9244
      3328 9238 3330 9235 3328 9234 3328 9233
      3326 9232 3328 9230 3326 9229 3326 9227
TIME...MOT...LOC 0520Z 227DEG 38KT 3310 9283 3313 9257 

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

13

2 follow-up statements

708 
WWUS54 KSHV 170531
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
1231 AM CDT Wed Mar 17 2021

ARC139-170600-
/O.CON.KSHV.SV.W.0009.000000T0000Z-210317T0600Z/
Union AR-
1231 AM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR CENTRAL UNION COUNTY...

At 1231 AM CDT, severe thunderstorms were located along a line
extending from near Wesson to Lawson, moving northeast at 45 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...
El Dorado, Norphlet, Calion, Urbana, Lawson, Moro Bay State Park,
Newell, Pigeon Hill and Kenova.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3315 9241 3314 9288 3336 9269 3336 9255
      3333 9252 3332 9253 3333 9250 3332 9249
      3333 9248 3332 9246 3329 9247 3327 9244
      3328 9238 3330 9235 3328 9234 3328 9233
      3326 9232 3328 9230 3326 9229 3326 9227
TIME...MOT...LOC 0531Z 227DEG 38KT 3316 9276 3319 9250 

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

13

583 
WWUS54 KSHV 170546
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
1246 AM CDT Wed Mar 17 2021

ARC139-170600-
/O.CON.KSHV.SV.W.0009.000000T0000Z-210317T0600Z/
Union AR-
1246 AM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR NORTHEASTERN UNION COUNTY...

At 1246 AM CDT, severe thunderstorms were located along a line
extending from near El Dorado to Moro Bay State Park, moving
northeast at 45 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...
El Dorado, Norphlet, Calion, Moro Bay State Park and Pigeon Hill. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3324 9235 3324 9269 3336 9269 3336 9255
      3333 9252 3332 9253 3333 9250 3332 9249
      3333 9248 3332 9246 3329 9247 3327 9244
      3328 9238 3330 9235 3328 9234 3328 9233
      3326 9232 3328 9230 3326 9229 3326 9227
TIME...MOT...LOC 0546Z 227DEG 38KT 3326 9264 3329 9238 

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

13

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, 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, 7:36 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Miller, Sevier	54 min
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

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.