Severe Thunderstorm Warning 175, NWS Shreveport, LA

450 
WWUS54 KSHV 211233
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
733 AM CDT SUN MAY 21 2017

TXC073-401-423-211300-
/O.CON.KSHV.SV.W.0175.000000T0000Z-170521T1300Z/
Smith TX-Rusk TX-Cherokee TX-
733 AM CDT SUN MAY 21 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 AM CDT
FOR SOUTHEASTERN SMITH...SOUTHERN RUSK AND NORTHEASTERN CHEROKEE
COUNTIES...

At 732 AM CDT, severe thunderstorms were located along a line
extending from near Bullard to near Turnertown to 8 miles south of 
Henderson to 7 miles southwest of Minden, moving northeast at 30 mph.
Hail the size of quarters was reported earlier with these storms near
Lake Striker north of Reklaw, Texas. 

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...
Whitehouse, Bullard, Troup, Arp, Mount Selman, Mixon, New Salem,
Minden, Turnertown, New Summerfield, Mount Enterprise, Concord,
Glenfawn, Brachfield and Laneville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

These storms are producing large hail. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows.

&&

LAT...LON 3212 9537 3227 9515 3202 9460 3197 9460
      3197 9451 3195 9451 3187 9477 3197 9512
TIME...MOT...LOC 1232Z 225DEG 38KT 3213 9525 3211 9501 3204 9484 3194
9478

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

13

Area Forecast Discussion
National Weather Service Shreveport LA
551 AM CDT Sun May 21 2017

.AVIATION...
Sfc cold front has moved to southern portions of the area and will
provide a focus for possible stg tstms at beginning of fcst
period, before this boundary moves south of the area. KLFK
terminal may in in the midst of these stg storms at 21/12z
beginning of fcst period. Meanwhile, an elevated frontal boundary
remains fairly stnry along or just south of I-30. Scattered
ongoing convection also expected to remain centered along this
boundary, and may continue to impact KTXK and KELD terminals, but
not as stg as convection further south. Thus, isold to sct
convection possible across much of area this aftn, but will high
based with mostly vfr cloud conditions, even near rw/trw. A strong
short wave will then move back into the area from the west after
22/06z, with more widespread showers developing mainly south of
I-20 with mid lvl decks beginning to lower. N-ne winds around 5 to
10 kts expected today, becmg lgt after 22/00z./07/

&&

.PREV DISCUSSION... /issued 257 AM CDT Sun May 21 2017/

DISCUSSION...

Despite being well removed from the vigorous upper level
trough across the Northern Plains into the Upper Great Lakes
region of the country, we continue to deal with isolated to
scattered convection across portions of the Four State Region
early this morning. This due in part to a myriad of convective
outflow boundaries, not to mention residual instability from some
atmospheric recovery from Sat Aftn, a weak sfc cold front making
slow progress into our region and weak upper level perturbations
in west southwest flow aloft across East Texas into Northern
Louisiana and Southern Arkansas.

Cold front as of 06z was oriented near a LZK...TXK...PSN line and
was continuing to make slow but steady progress south and east
early this morning. The front should continue moving southeast
during the day, moving through all but our extreme southeast
parishes of Northern Louisiana by this afternoon. Seeing some
elevated convection currently to the north and west of the
Interstate 30 corridor of Northeast Texas and Southwest Arkansas
with this convection oriented along the 850mb front which has made
just about as much progress south and east as it will make today.
For this reason, cannot rule out additional prefrontal and post
frontal showers and thunderstorms once again today but the best
coverage should be across our southern most zones through this
afternoon. Models continue to indicate an embedded disturbance in
this WSW flow aloft moving our way quickly tonight from the TX
Hill Country. Our southwest zones will be in the left front exit
region of a 70-90kt upper level jet oriented west to east across
Central TX late tonight which should allow for good upper level
forcing despite a rather stable post frontal boundary layer across
our region. The NAM output continues to be the most vigorous with
convection overnight but the GFS and ECMWF are trying to play
catchup so to speak so have beefed up pops tonight, especially
after midnight tonight and through the day Monday for the above
reasons. The highest rain chances will be felt across our southern
third tonight through Monday before we lose the effects of the
disturbance to our east.

Beyond Monday, we look upstream once again to our north and west
as another strong shortwave splits off the Upper Great Lakes
trough and moves due south into the Central and Southern Plains
late Monday Night into Tuesday. Strong PVA signal in advance of
what will become a developing longwave trough across the Mid Miss
Valley, resulting in increased chances of showers and
thunderstorms once again Tue along and ahead of a cold front which
should blow through our region Tue Night. The trough appears to
cut itself off a little further north and east of our region
Wed/Wed Night which may limit post frontal shower activity Wed/Wed
Night but none the less, much cooler airmass will be felt behind
this cold front for Wed into Thu. Still forecasting overnight lows
in the upper 40s to lower-mid 50s for next Wed Night/Thu morning
with a quick moderation in temperatures for the upcoming weekend
on the heels of returning southerly flow. Southwest flow aloft
commencing once again for next weekend suggests scattered showers
and thunderstorms returning to the region as well by this
timeframe.

Prelims to follow...13.

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  79  62  71  60 /  40  50  60  40
MLU  80  62  72  59 /  40  40  60  40
DEQ  78  55  74  57 /  10  10  20  40
TXK  78  59  72  57 /  20  20  30  40
ELD  78  56  73  57 /  20  20  60  30
TYR  77  62  74  61 /  40  50  50  40
GGG  78  62  72  59 /  40  50  60  40
LFK  80  66  73  62 /  50  60  70  40

&&

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

Hazardous Weather Outlook
National Weather Service Shreveport LA
320 AM CDT Sun May 21 2017

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-211800-
Sevier-Howard-Little River-Hempstead-Nevada-Miller-Lafayette-
Columbia-Union-Caddo-Bossier-Webster-Claiborne-Lincoln-De Soto-
Red River-Bienville-Jackson-Ouachita-Sabine-Natchitoches-Winn-
Grant-Caldwell-La Salle-McCurtain-Bowie-Franklin-Titus-Camp-
Morris-Cass-Wood-Upshur-Marion-Smith-Gregg-Harrison-Cherokee-Rusk-
Panola-Nacogdoches-Shelby-Angelina-San Augustine-
320 AM CDT Sun May 21 2017

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

.DAY ONE...Today and Tonight...

Isolated to scattered showers and thunderstorms will be possible
across much of the Four State Region today through tonight as a
series of upper level disturbances are forecast to influence the
region. The highest rain chances will be felt across the southern
third of Northeast Texas into portions of West Central and East
Central Louisiana through tonight. Strong thunderstorms will be
possible today and an isolated severe thunderstorm cannot be ruled
out through the early evening hours today. Locally heavy downpours
will also be possible with thunderstorm activity today through
tonight.

.DAYS TWO THROUGH SEVEN...Monday through Saturday...

Scattered to numerous showers and thunderstorms will again be
possible across the Four State Region on Monday with the highest
rain chances once again forecast to be across the southern third
of Northeast Texas into portions of West Central and East Central
Louisiana. A strong upper level storm system will approach the
region from the northwest during the day Tuesday bringing with it
scattered showers and thunderstorms Tuesday into Tuesday Night
before the activity exits the region to our east for Wednesday.
Severe thunderstorms are not anticipated with any of this activity
Monday through Tuesday Night.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators...and storm spotters should not be needed through
tonight.

13

Special Weather Statement
National Weather Service Shreveport LA
109 AM CDT SUN MAY 21 2017

ARZ073-LAZ004-006-210700-
Union AR-Union LA-Claiborne LA-
109 AM CDT SUN MAY 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL UNION COUNTY...
NORTHWESTERN UNION AND NORTHEASTERN CLAIBORNE PARISHES UNTIL 200 AM
CDT...

At 109 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 9 miles southwest of Wesson to 6 miles
southwest of Junction City to 7 miles west of Bernice. Movement was
east northeast at 25 mph.

Half inch hail and strong winds of 40 to 50 mph will be possible
with these storms.

Locations impacted include...
Junction City, Bernice, Cooley, Lisbon, Spearsville, Lillie, Corney
Lake, Lockhart, Taylorville, Summerfield and Catesville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3315 9263 3299 9242 3281 9245 3276 9287
      3293 9287 3302 9297
TIME...MOT...LOC 0608Z 259DEG 23KT 3301 9287 3295 9279 3283 9279

15

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
122 AM CDT SUN MAY 21 2017

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

0935 PM     HAIL             JOAQUIN                 31.97N 94.06W
05/20/2017  E1.50 INCH       SHELBY             TX   BROADCAST MEDIA

            A PICTURE OF PING PONG BALL SIZE HAIL WAS
            POSTED BY THE PUBLIC TO THE KSLA FACEBOOK
            PAGE.

&&

15

Special Weather Statement
National Weather Service Shreveport LA
151 AM CDT SUN MAY 21 2017

ARZ072-073-210730-
Union AR-Columbia AR-
151 AM CDT SUN MAY 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN UNION AND EAST
CENTRAL COLUMBIA COUNTIES UNTIL 230 AM CDT...

At 150 AM CDT, Doppler radar was tracking a strong thunderstorm over
Village, or 11 miles east of McNeil, moving northeast at 25 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Smackover, Norphlet, Village, Mount Holly, Marysville, Ebenezer,
Kenova, Laughlin and Medlock.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3321 9303 3332 9312 3338 9303 3337 9279
      3339 9276 3338 9273 3337 9271 3337 9268
      3336 9268 3337 9263 3336 9263 3336 9261
      3335 9260
TIME...MOT...LOC 0650Z 238DEG 22KT 3328 9302

15

Special Weather Statement
National Weather Service Shreveport LA
600 AM CDT SUN MAY 21 2017

TXZ149-211145-
Cherokee TX-
600 AM CDT SUN MAY 21 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CHEROKEE COUNTY UNTIL 645
AM CDT...

At 600 AM CDT, Doppler radar was tracking a strong thunderstorm near
Maydelle, or 10 miles southwest of Rusk, moving east northeast at 25
mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Rusk, Maydelle, Ponta, Gallatin and Reklaw.

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.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3180 9540 3197 9503 3176 9496 3174 9497
      3172 9496 3171 9496 3164 9528 3168 9528
      3171 9531 3172 9534 3173 9533 3173 9537
      3174 9537 3174 9536 3175 9536 3176 9540
TIME...MOT...LOC 1100Z 248DEG 24KT 3173 9531

13

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
657 AM CDT SUN MAY 21 2017

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

0630 AM     HAIL             RUSK                    31.80N 95.15W
05/21/2017  E1.00 INCH       CHEROKEE           TX   LAW ENFORCEMENT

            SHERIFF OFFICE AND PUBLIC CONFIRM QUARTER
            SIZE HAIL IN CITY OF RUSK.

&&

20