Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 252, NWS Shreveport, LA

December 23, 2015McCurtain County, Oklahoma; Sevier County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at Dec 23, 2015, 6:37 AM CST for McCurtain County, Oklahoma; Sevier County, Arkansas. It was in force for 38 min. 2 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: Dec 23, 2015, 6:37 AM CST (12:37 UTC)
Expired: Dec 23, 2015, 7:15 AM CST
In force: 38 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Sevier County, AR, McCurtain County, OK

The radar

The Western Arkansas radar (KSRX), 153 km from the middle of the area, began a volume at 12:37 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
Dec 23, 6:43 AM CST	TSTM WND DMG	Broken Bow, OK	TREES DOWN ON HOUSES AND ON VEHICLES ON SYLVIE ROAD. POWER LINES DOWN AS WELL.
Dec 23, 6:47 AM CST	TSTM WND DMG	1 S Broken Bow, OK	SEVERAL TREES AND POWER LINES DOWN IN BROKEN BOW.

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
Dec 23, 12:06 AM CST	Tornado Watch	SPC	7 hr
Dec 23, 6:20 AM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 0.6 hours before the alert went out and 186 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: 1041 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 598 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 293 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 6.2

Open this sounding in Storm Lab

The text

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

941 
WUUS54 KSHV 231237
SVRSHV
ARC133-OKC089-231315-
/O.NEW.KSHV.SV.W.0252.151223T1237Z-151223T1315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
637 AM CST WED DEC 23 2015

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN SEVIER COUNTY IN SOUTHWESTERN ARKANSAS...
  CENTRAL MCCURTAIN COUNTY IN SOUTHEASTERN OKLAHOMA...

* UNTIL 715 AM CST

* AT 637 AM CST...A SEVERE THUNDERSTORM WAS LOCATED JUST SOUTHWEST
  OF IDABEL...OR 26 MILES NORTHEAST OF CLARKSVILLE...MOVING
  NORTHEAST AT 55 MPH. OTHER STRONG THUNDERSTORMS WERE NEAR THE
  MCCURTAIN AND SEVIER COUNTY LINE...OR 5 MILES WEST OF
  DEQUEEN...ALSO MOVING NORTHEAST AT 55 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...
  DE QUEEN...IDABEL...BROKEN BOW...GILLHAM...HAWORTH...GARVIN...CERROGORDO...
  OAK HILL...HOLLY CREEK...GOODWATER...EAGLETOWN...WEST LINE...WEST OTIS
  AND GOLDEN.

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.

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 PM CST FOR SOUTHWESTERN
ARKANSAS...SOUTHEASTERN OKLAHOMA AND NORTHEASTERN TEXAS.

LAT...LON 3430 9447 3419 9447 3419 9424 3405 9421
      3393 9446 3394 9448 3392 9448 3376 9482
      3377 9483 3375 9483 3381 9492 3383 9492
      3382 9493 3384 9497 3386 9497 3385 9498
      3386 9500 3396 9501
TIME...MOT...LOC 1235Z 236DEG 49KT 3395 9485 

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

15

1 follow-up statement

549 
WWUS54 KSHV 231309
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
709 AM CST WED DEC 23 2015

OKC089-231318-
/O.CAN.KSHV.SV.W.0252.000000T0000Z-151223T1315Z/
MCCURTAIN OK-
709 AM CST WED DEC 23 2015

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MCCURTAIN COUNTY IS
CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 PM CST FOR SOUTHWESTERN
ARKANSAS AND SOUTHEASTERN OKLAHOMA.

LAT...LON 3419 9424 3405 9421 3393 9446 3394 9447
      3394 9448 3419 9447
TIME...MOT...LOC 1308Z 226DEG 50KT 3416 9441 

$$

ARC133-231315-
/O.CON.KSHV.SV.W.0252.000000T0000Z-151223T1315Z/
SEVIER AR-
709 AM CST WED DEC 23 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 AM CST
FOR NORTHWESTERN SEVIER COUNTY...

AT 709 AM CST...A SEVERE THUNDERSTORM WAS LOCATED NEAR GILLHAM...OR
8 MILES NORTHWEST OF DE QUEEN...MOVING NORTHEAST AT 60 MPH. THIS
STORM HAS SHOWN A WEAKENING TREND IN THE LAST FEW MINUTES...AND
FURTHER WEAKENING IS POSSIBLE.

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...
DE QUEEN...GILLHAM...WEST OTIS AND WEST LINE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH A TORNADO IS NOT
IMMEDIATELY LIKELY...IF ONE IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE
OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 PM CST FOR SOUTHWESTERN
ARKANSAS AND SOUTHEASTERN OKLAHOMA.

LAT...LON 3419 9424 3405 9421 3393 9446 3394 9447
      3394 9448 3419 9447
TIME...MOT...LOC 1308Z 226DEG 50KT 3416 9441 

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

15

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 23, 5:13 AM CST	Severe Thunderstorm Warning	SHV	McCurtain	62 min
Dec 23, 5:41 AM CST	Special Weather Statement	SHV	McCurtain	34 min
Dec 23, 12:40 AM CST	Special Weather Statement	SHV	Columbia	35 min
Dec 23, 12:49 AM CST	Special Weather Statement	SHV	Columbia	26 min
Dec 23, 7:51 AM CST	Special Weather Statement	SHV	Little River	39 min
Dec 23, 8:17 AM CST	Special Weather Statement	SHV	Howard	58 min
Dec 23, 8:59 AM CST	Special Weather Statement	SHV	Hempstead	31 min
Dec 23, 9:15 AM CST	Special Weather Statement	SHV	Hempstead, Nevada	60 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2015 Severe Thunderstorm Warnings in Arkansas, 2015 Every severe thunderstorm warning in 2015

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.