Alert archive / Arkansas / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 79, NWS Shreveport, LA

April 4, 2017Howard County, Little River County, Sevier County, Arkansas; McCurtain County, Oklahoma; Bowie County, Red River County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 4, 2017, 10:26 PM CDT for Howard County, Little River County, Sevier County, Arkansas; McCurtain County, Oklahoma; Bowie County, Red River County, Texas. It was in force for 12 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: Apr 4, 2017, 10:26 PM CDT (03:26 UTC)
Expired: Apr 4, 2017, 10:38 PM CDT
In force: 12 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

Counties Howard County, AR, Little River County, AR, Sevier County, AR, McCurtain County, OK, Bowie County, TX, Red River County, TX

The radar

The Shreveport radar (KSHV), 162 km from the middle of the area, began a volume at 03:27 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 4, 9:12 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 00:00Z, 3.4 hours before the alert went out and 162 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: 91 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 2479 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

969 
WUUS54 KSHV 050326
SVRSHV
ARC061-081-133-OKC089-TXC037-387-050415-
/O.NEW.KSHV.SV.W.0079.170405T0326Z-170405T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
1026 PM CDT TUE APR 4 2017

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Northwestern Little River County in southwestern Arkansas...
  Sevier County in southwestern Arkansas...
  South central Howard County in southwestern Arkansas...
  Southeastern McCurtain County in southeastern Oklahoma...
  Northwestern Bowie County in northeastern Texas...
  East central Red River County in northeastern Texas...

* Until 1115 PM CDT

* At 1025 PM CDT, a severe thunderstorm was located 13 miles
  southeast of Idabel, or 18 miles west of Foreman, moving northeast
  at 55 mph.

  HAZARD...Half dollar size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Damage to vehicles is expected. 

* Locations impacted include...
  De Queen, Ashdown, Horatio, Foreman, Idabel, De Kalb, Lockesburg,
  Wilton, Winthrop, Ben Lomond, Arkinda, Oak Grove, Haworth,
  Eagletown, Silver Ridge, Moon, Cerrogordo, Beaverdams, Goodlake and
  Geneva.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3348 9472 3382 9490 3415 9449 3414 9407
      3378 9390
TIME...MOT...LOC 0325Z 236DEG 48KT 3373 9472 

HAIL...1.25IN
WIND...<50MPH
 
$$

FB

1 follow-up statement

714 
WWUS54 KSHV 050338
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
1038 PM CDT TUE APR 4 2017

ARC061-081-133-OKC089-TXC037-387-050347-
/O.CAN.KSHV.SV.W.0079.000000T0000Z-170405T0415Z/
Little River AR-Sevier AR-Howard AR-McCurtain OK-Bowie TX-
Red River TX-
1038 PM CDT TUE APR 4 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN LITTLE RIVER...
SEVIER...SOUTH CENTRAL HOWARD...SOUTHEASTERN MCCURTAIN...NORTHWESTERN
BOWIE AND EAST CENTRAL RED RIVER COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning has been cancelled.  However small hail is
still possible with this thunderstorm.

A severe thunderstorm watch remains in effect until 300 AM CDT for
southwestern Arkansas...southeastern Oklahoma...and northeastern
Texas.

LAT...LON 3348 9472 3382 9490 3415 9449 3414 9407
      3378 9390
TIME...MOT...LOC 0336Z 236DEG 48KT 3382 9455 

$$

FB

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 4, 7:08 PM CDT, 3 hours 18 minutes earlier.

Area forecast discussion, Apr 4, 7:08 PM CDT, 3 hours 18 minutes before

Area Forecast Discussion
National Weather Service Shreveport LA
708 PM CDT Tue Apr 4 2017

.UPDATE...
Lake wind advisory has expired for this evening. Updated zone
forecast package has been issued. Stronger winds are expected to
return on Wednesday, and a new advisory will be warranted so plan
to include that in the evening update after analyzing additional
model guidance. Some of our western areas may even require a wind
advisory so that determination will be made for the next update.

/19/

&&

.PREV DISCUSSION... /issued 625 PM CDT Tue Apr 4 2017/

AVIATION...
Increasing mid to upper level CIGS will continue to spread from
west to east courtesy of an approaching upper level disturbance to
the northwest. This disturbance will also be responsible for the
development of isolated -SHRA/-TSRA particularly nearing/affecting
ktxk, ktyr, kggg, kshv and maybe klfk tonight. Have therefore
elected to insert VCSH or VCTS at the aforementioned sites late
tonight/early tomorrow morning. There is a Severe Thunderstorm
Watch in effect until 9 pm CDT across eastern OK so we will keep
an eye out for any rogue storm development.

Otherwise, slightly breezy conditions exist across the western
terminals due to the approaching upper level disturbance, which
is why a Lake Wind Advisory is in effect until 7 pm CDT for all
of east TX, deep east TX, southeast OK and portions of northwest
LA. Winds will stay up a bit but remain below Wind Advisory
criteria shortly after sunset, as winds veer to the northwest by
tomorrow morning. Wind speeds are anticipated to pick up quite a
bit by late tomorrow morning/early afternoon with sustained wind
speeds of 16-20 kts /possibly higher/ with higher gusts expected.

PREV DISCUSSION... /issued 234 PM CDT Tue Apr 4 2017/

DISCUSSION...
Upper low continues to churn its way ewd across the srn plains
this afternoon, and a lack of cloud cover downstream per visible
satellite confirms the lack of moisture that our 12Z and 18Z
soundings show. Nevertheless, models indicate that at least some
recovery will accompany the trof as it moves into central OK later
this afternoon/evening. Sct tstms will be possible, mainly across
the I-30 corridor and nwd. Strong shear and steep mid level lapse
rates will allow for a few of the storms to become severe, with
large hail as the primary threat. Further s, coverage will be more
isold and storm intensity will likely be scaled down due to lack
of moisture and distance from the better upper level support.
Thunderstorms and the threat for severe weather will come to an
end prior to sunrise, but a few shwrs may remain possible as
moisture wraps around the back side of the low.

Sharpening pressure gradient will accompany the low and will make
for some very gusty winds Wed. A Lake Wind Advisory will be
needed but will hold off and allow the mid shift to issue so as
to not confuse with the advisory already in effect for today.

Cooler and drier air will filter in behind the low late Wed as it
finally pushes ewd and leaves us under nw flow aloft. We will see
overnight low temps dip into the mid and even lower 40s for
Wed/Thu nights and daytime temps very near seasonal averages
through Friday.

Sly flow will return ahead of another upper trof beginning
Saturday, which will help to send our temperatures back up into
the 80s for the weekend. Rain chances will return as the trof
ejects into the plains and a cold front approaches our region
Monday. /12/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  57  69  48  73 /  20  10  10   0
MLU  65  71  49  71 /  20  10  10   0
DEQ  50  66  43  70 /  40  20  10   0
TXK  53  66  45  70 /  30  20  10   0
ELD  59  66  45  70 /  20  10  10   0
TYR  52  69  45  74 /  20   0  10   0
GGG  54  70  46  73 /  20  10  10   0
LFK  56  72  47  75 /  20   0  10   0

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...None.
LA...None.
OK...None.
TX...None.
&&

19

Hazardous weather outlook, Apr 4, 11:10 AM CDT, 11 hours 16 minutes before

Hazardous Weather Outlook
National Weather Service Shreveport LA
1110 AM CDT Tue Apr 4 2017

ARZ061-070>073-LAZ001>006-010>014-017>022-TXZ108>112-124>126-
136>138-149>153-165>167-051615-
Nevada-Miller-Lafayette-Columbia-Union-Caddo-Bossier-Webster-
Claiborne-Lincoln-De Soto-Red River-Bienville-Jackson-Ouachita-
Sabine-Natchitoches-Winn-Grant-Caldwell-La Salle-Franklin-Titus-
Camp-Morris-Cass-Wood-Upshur-Marion-Smith-Gregg-Harrison-Cherokee-
Rusk-Panola-Nacogdoches-Shelby-Angelina-San Augustine-
1110 AM CDT Tue Apr 4 2017

This Hazardous Weather Outlook is for portions of south central
Arkansas...southwest Arkansas...north central Louisiana...
northwest Louisiana...east Texas and northeast Texas.

.DAY ONE...This Afternoon and Tonight...

A few showers and thunderstorms will be possible tonight as a cold
front moves across the region. However, hazardous weather is not
expected at this time.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

Thunderstorms will be possible again Monday as another cold front
approaches the region. No hazardous weather is expected at this
time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated through tonight.

ARZ050-051-059-060-OKZ077-TXZ096-097-051615-
Sevier-Howard-Little River-Hempstead-McCurtain-Red River-Bowie-
1110 AM CDT Tue Apr 4 2017

This Hazardous Weather Outlook is for portions of southwest
Arkansas...southeast Oklahoma and northeast Texas.

.DAY ONE...This Afternoon and Tonight...

Isolated to scattered thunderstorms will be possible late this
afternoon and tonight, and a few could produce large hail.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

Thunderstorms will be possible again Monday as another cold front
approaches the region. No hazardous weather is expected at this
time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated through tonight.

12

In the hours before

Local storm report, Apr 4, 8:04 PM CDT, 2 hours 22 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE SHREVEPORT LA
804 PM CDT TUE APR 4 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0259 PM     TORNADO          7 WSW MIDWAY            31.63N 92.25W
04/02/2017                   LA SALLE           LA   NWS STORM SURVEY

            AN EF-2 TORNADO WITH MAX ESTIMATED WINDS OF
            111-120 MPH TOUCHED DOWN ALONG HIGHWAY 8,
            PRIMARILY SNAPPING AND UPROOTING TREES.
            SEVERAL OUTBUILDINGS LOST SIDING OR PORTIONS
            OF THEIR ROOFS, AND SEVERAL HOMES ON SEARCY
            EDEN ROAD HAD ROOF DAMAGE. THE MOST
            SIGNIFICANT DAMAGE CAME WHEN AN OIL DERRICK
            TOPPLED AND THE CONCRETE ANCHOR BLOCK WAS
            PULLED OUT OF THE GROUND. A SECOND VERY OLD
            AND RUSTY DERRICK ALSO COLLAPSED AND
            CRUMBLED. THE TOTAL PATH LENGTH WAS 2.43
            MILES, WITH A MAXIMUM WIDTH OF 0.64 MILES.

&&

15

Local storm report, Apr 4, 8:12 PM CDT, 2 hours 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
812 PM CDT TUE APR 4 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0307 PM     TORNADO          12 SW FLORIEN           31.31N 93.58W
04/02/2017                   SABINE             LA   NWS STORM SURVEY

            AN EF-1 TORNADO WITH MAX ESTIMATED WINDS
            BETWEEN 95-105 MPH TOUCHED DOWN ALONG HOG
            HEAVEN ROAD IN EXTREME SOUTHWEST SABINE
            PARISH, CROSSING FERGUSON ROAD WHILE
            TRAVELING ACROSS THE HEAVILY WOODED AREAS
            BEFORE CROSSING HIGHWAY 191 NEAR PROSPECT
            ROAD. NUMEROUS TREES WERE SNAPPED AND
            UPROOTED, WITH THE ROOF OF A DOUBLEWIDE
            MANUFACTURED HOME TORN OFF AND A NEARBY
            OUTBUILDING DESTROYED. THE TORNADO
            PARALLELED PROSPECT ROAD, WHERE IT WAS MOST
            INTENSE BETWEEN VICTORIA ROAD AND WREN LANE.
            THIS TORNADO CROSSED CLEARWATER ROAD,
            PROSPECT ROAD ONCE AGAIN, AND FRED VOGLE
            ROAD, BEFORE TRAVELLING ACROSS HEAVILY
            WOODED AREAS EAST OF PROSPECT ROAD. SEVERAL
            ADDITIONAL TREES WERE SNAPPED AND UPROOTED
            ALONG AND NORTH OF GANDY ROAD, BEFORE THE
            TORNADO FINALLY LIFTED JUST SHY OF HIGHWAY
            171 JUST SOUTH OF FLORIEN. THE PATH LENGTH
            WAS 9.86 MILES, WITH A PATH WIDTH OF 370
            YARDS.

&&

15

Local storm report, Apr 4, 9:19 PM CDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
919 PM CDT TUE APR 04 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0835 PM     HAIL             4 N VALLIANT            34.06N  95.09W
04/04/2017  E1.00 INCH       MCCURTAIN          OK   EMERGENCY MNGR

            QUARTER SIZE HAIL REPORTED 4 MILES NORTH OF VALLIANT

&&

EVENT NUMBER SHV1700061

19

Special weather statement, Apr 4, 9:43 PM CDT, 43 minutes before

Special Weather Statement
National Weather Service Shreveport LA
943 PM CDT TUE APR 4 2017

OKZ077-050315-
McCurtain OK-
943 PM CDT TUE APR 4 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN MCCURTAIN COUNTY UNTIL
1015 PM CDT...

At 943 PM CDT, Doppler radar was tracking a strong thunderstorm 15
miles northwest of Broken Bow, or 34 miles west of De Queen, moving
northeast at 50 mph.

Nickel size hail and wind gusts up to 40 mph will be possible with
this storm.

Locations impacted include...
Plunketville, Watson, Bethel, Mount Herman, Smithville and Sherwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

A severe thunderstorm watch remains in effect until 300 AM CDT for
southeastern Oklahoma.

LAT...LON 3431 9447 3406 9497 3424 9506 3425 9505
      3434 9505 3451 9469 3451 9446
TIME...MOT...LOC 0243Z 236DEG 45KT 3420 9492

FB

Special weather statement, Apr 4, 9:47 PM CDT, 39 minutes before

Special Weather Statement
National Weather Service Shreveport LA
947 PM CDT TUE APR 4 2017

ARZ050-051-OKZ077-050330-
Howard AR-Sevier AR-McCurtain OK-
947 PM CDT TUE APR 4 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SEVIER...
NORTHWESTERN HOWARD AND EAST CENTRAL MCCURTAIN COUNTIES UNTIL 1030 PM
CDT...

At 947 PM CDT, Doppler radar was tracking a strong thunderstorm near
Idabel, or 24 miles west of Horatio, moving northeast at 55 mph.

Dime size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
De Queen, Dierks, Idabel, Broken Bow, Gillham, Eagletown, Hochatown,
Goodwater, Lebanon, Holly Creek, Glover, West Line, Oak Hill and
Golden.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

A severe thunderstorm watch remains in effect until 300 AM CDT for
southwestern Arkansas...and southeastern Oklahoma.

LAT...LON 3413 9402 3383 9477 3406 9497 3431 9447
      3419 9447 3419 9425 3436 9425 3435 9420
TIME...MOT...LOC 0247Z 237DEG 48KT 3395 9478

19

Local storm report, Apr 4, 10:05 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1005 PM CDT TUE APR 4 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1002 PM     HAIL             CLARKSVILLE             33.61N 95.05W
04/04/2017  E1.75 INCH       RED RIVER          TX   LAW ENFORCEMENT

            SHERIFF OFFICE REPORTED 1.75" HAIL IN
            CLARKSVILLE.

&&

27

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 10:00 PM CDT	Lake Wind Advisory	SHV	Columbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more	21 hr
Apr 4, 10:41 PM CDT	Special Weather Statement	SHV	Howard, Little River, Sevier	34 min
Apr 4, 11:15 PM CDT	Special Weather Statement	SHV	Howard	15 min
Apr 4, 11:46 PM CDT	Special Weather Statement	SHV	Howard, Little River, Sevier	44 min
Apr 4, 8:22 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	38 min
Apr 4, 9:02 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	14 min
Apr 4, 9:10 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	24 min
Apr 4, 9:43 PM CDT	Special Weather Statement	SHV	McCurtain	32 min
Apr 4, 9:45 PM CDT	Severe Thunderstorm Warning	SHV	McCurtain	45 min
Apr 4, 9:47 PM CDT	Special Weather Statement	SHV	McCurtain	43 min
Apr 4, 10:45 PM CDT	Special Weather Statement	SHV	McCurtain	45 min
Apr 4, 11:30 PM CDT	Special Weather Statement	SHV	McCurtain	45 min
Apr 4, 11:03 PM CDT	Special Weather Statement	SHV	Red River	42 min
Apr 5, 2:44 AM CDT	Special Weather Statement	SHV	Angelina	46 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2017 Severe Thunderstorm Warnings in Texas, 2017 Severe Thunderstorm Warnings in Oklahoma, 2017 Every severe thunderstorm warning in 2017

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.