Alert archive / Arkansas / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 21, NWS Shreveport, LA

March 28, 20144 counties in Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at Mar 28, 2014, 4:03 PM CDT for 4 counties in Arkansas. It was in force for 42 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: Mar 28, 2014, 4:03 PM CDT (21:03 UTC)
Expired: Mar 28, 2014, 4:45 PM CDT
In force: 42 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Hempstead County, AR, Howard County, AR, Little River County, AR, Sevier County, AR

The radar

The Shreveport radar (KSHV), 163 km from the middle of the area, began a volume at 21:03 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
Mar 28, 2:35 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 9.1 hours before the alert went out and 159 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: 1548 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 564 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 5.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

717 
WUUS54 KSHV 282103
SVRSHV
ARC057-061-081-133-282145-
/O.NEW.KSHV.SV.W.0021.140328T2103Z-140328T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
403 PM CDT FRI MAR 28 2014

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN HEMPSTEAD COUNTY IN SOUTHWEST ARKANSAS...
  SOUTHEASTERN HOWARD COUNTY IN SOUTHWEST ARKANSAS...
  SOUTHEASTERN LITTLE RIVER COUNTY IN SOUTHWEST ARKANSAS...
  THIS INCLUDES THE CITY OF ASHDOWN...
  EXTREME SOUTHEASTERN SEVIER COUNTY IN SOUTHWEST ARKANSAS...

* UNTIL 445 PM CDT

* AT 400 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR   
  PINE PRAIRIE...OR NEAR ASHDOWN...AND MOVING NORTHEAST AT 55 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SARATOGA...TOLLETTE AND BLEVINS...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 3399 9368 3399 9365 3397 9362 3395 9352
      3396 9349 3396 9345 3391 9346 3356 9405
      3368 9417 3401 9373
TIME...MOT...LOC 2102Z 230DEG 48KT 3367 9402

$$

19

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 28, 4:25 PM CDT	Severe Thunderstorm Warning	SHV	Union	20 min
Mar 28, 4:25 PM CDT	Severe Thunderstorm Warning	SHV	Little River	50 min
Mar 28, 4:43 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Nevada, Sevier	62 min
Mar 28, 5:04 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Miller, Nevada	56 min
Mar 28, 5:14 PM CDT	Severe Thunderstorm Warning	SHV	Miller	46 min
Mar 28, 5:48 PM CDT	Severe Thunderstorm Warning	SHV	Columbia, Hempstead, Lafayette, Miller, Nevada	57 min
Mar 28, 5:54 PM CDT	Severe Thunderstorm Warning	SHV	Little River	51 min
Mar 28, 6:38 PM CDT	Flash Flood Warning	SHV	Hempstead, Lafayette, Little River, Miller	2 hr
Mar 28, 6:44 PM CDT	Severe Thunderstorm Warning	SHV	Columbia, Union	61 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2014 Every severe thunderstorm warning in 2014

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.