Alert archive / Arkansas / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

March 17, 2021Miller County, Arkansas

NWS Shreveport, LA issued this special weather statement at Mar 17, 2021, 2:41 AM CDT for Miller County, Arkansas. It was in force for 49 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 17, 2021, 2:41 AM CDT (07:41 UTC)
Expired: Mar 17, 2021, 3:30 AM CDT
In force: 49 min
Issued by: NWS Shreveport, LA

County Miller County, AR

The radar

The Shreveport radar (KSHV), 97 km from the middle of the area, began a volume at 07:40 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 nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 7.7 hours before the alert went out and 95 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.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Mar 17, 1:06 AM CDT, 1 hour 35 minutes earlier.

Area forecast discussion, Mar 17, 1:06 AM CDT, 1 hour 35 minutes before

Area Forecast Discussion
National Weather Service Shreveport LA
106 AM CDT Wed Mar 17 2021

.AVIATION...
For the 17/06z TAFs, isolated to widely scattered showers and
thunderstorms will continue across the area during the first
several hours of the TAF period. Beginning around 17/12z, a line
of strong to severe thunderstorms will move into Southeast
Oklahoma and East Texas, including KTYR. This line of storms will
move eastward through the entire area affecting all TAF sites. The
storms should finally move east of KMLU and into far Eastern
Louisiana around 18/00z. Severe convection is likely across
Southwest/Southern Arkansas and much of Louisiana during the
17/16z-18/00z time frame.

MVFR/IFR ceilings will prevail across the area at the beginning of
the period but should improve slightly, although remaining MVFR
through much of the day. As a strong cold front pushes east behind
the convection, strong westerly winds will develop during the
afternoon advecting drier air into the region quickly clearing
skies.

CN

&&

.PREV DISCUSSION... /issued 948 PM CDT Tue Mar 16 2021/

UPDATE...

Continuing to watch a pseudo-warm front designated by slightly
higher dewpoints located near or just south of the I-20 Corridor
in NE TX to north of MLU continuing to slowly shift northward
attm. Isolated supercells earlier during the late afternoon/early
evening across NE LA formed along this boundary but have since
dissipated. Just in the last hour, isolated convection has
redeveloped once again across NW LA east of SHV and also west of
SHV. 00z SHV sounding did show weak capping near 10kft and as we
go through the remainder of the overnight hours, that CAP should
continue to strengthen.

00z NAM output along with latest HRRR suggests that any new
convection should remain near or north of the I-20 Corridor later
tonight as the pseudo-warm front continues to move northward with
the greatest coverage expected across portions of SW and SC AR.
Some of this could be strong to severe with large hail being the
main threat. After 3 AM towards sunrise, upper forcing should
really begin to ramp up near and northwest of the I-30 Corridor of
NE TX, SE OK and SW AR with the ejection of the upper trough to
our west and while much of this should remain elevated, cannot
rule out a large hail, damaging wind threat with this new
convection.

For the update, did not make much in the way of changes to
overnight low temps but did adjust pops based on the latest
guidance.

Updated forecast already sent...13.

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  47  65  43  62 /   0   0   0   0
MLU  48  64  45  59 /  10   0   0   0
DEQ  44  59  40  62 /  10   0   0   0
TXK  48  61  42  60 /   0   0   0   0
ELD  46  61  42  59 /   0   0   0   0
TYR  45  63  43  62 /   0   0   0   0
GGG  45  63  42  61 /   0   0   0   0
LFK  46  67  43  64 /   0   0   0   0

&&

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

09/20

Hazardous weather outlook, Mar 16, 1:02 PM CDT, 13 hours 39 minutes before

Hazardous Weather Outlook
National Weather Service Shreveport LA
102 PM CDT Tue Mar 16 2021

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-171815-
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-
102 PM CDT Tue Mar 16 2021

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...This Afternoon and Tonight...

Isolated thunderstorms will remain possible this afternoon, with
the best chances across areas of Northeast and Central Louisiana,
along with portions of Deep East Texas. Thunderstorms will
increase in coverage and intensity as we head into this evening
and through the overnight hours. Large hail and damaging winds
will be the main threat, however, a tornado cannot be completely
ruled out.

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

Thunderstorms will increase across the area on Wednesday as a
cold front begins to push through the region. Widespread severe
thunderstorms capable of producing tornadoes, large hail, and
damaging wind gusts are expected. The greatest threat for the
strongest storms will be across portions of northwest and north
central Louisiana and southwest Arkansas.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel, amateur radio
operators, and storm spotters will be needed late Tuesday through
Wednesday afternoon.

In the hours before

Special weather statement, Mar 17, 12:14 AM CDT, 2 hours 27 minutes before

Special Weather Statement
National Weather Service Shreveport LA
1214 AM CDT Wed Mar 17 2021

ARZ073-170600-
Union AR-
1214 AM CDT Wed Mar 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR UNION COUNTY UNTIL 100 AM CDT...

At 1214 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles east of Atlanta to 7 miles northeast of
Junction City. Movement was north at 35 mph.

Half inch hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
El Dorado, Smackover, Norphlet, Junction City, Calion, Lisbon,
Lawson, Wesson, Hew Hope, Newell, Marysville, Cairo, Hillsboro, Three
Creeks, Kenova 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 3305 9255 3301 9285 3302 9299 3319 9299
      3338 9292 3337 9279 3339 9276 3336 9266
      3336 9260 3337 9259 3336 9254 3332 9252
      3333 9250 3332 9249 3333 9248 3332 9246
      3329 9247 3328 9246 3327 9241
TIME...MOT...LOC 0514Z 201DEG 32KT 3305 9295 3309 9262

13

Special weather statement, Mar 17, 12:43 AM CDT, 1 hour 58 minutes before

Special Weather Statement
National Weather Service Shreveport LA
1243 AM CDT Wed Mar 17 2021

OKZ077-170600-
McCurtain OK-
1243 AM CDT Wed Mar 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL MCCURTAIN COUNTY
UNTIL 100 AM CDT...

At 1242 AM CDT, Doppler radar was tracking a strong thunderstorm 8
miles southwest of Octavia, or 32 miles east of Clayton, moving north
at 40 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

This storm will remain over mainly rural areas of north central
McCurtain County.

LAT...LON 3433 9471 3437 9493 3451 9491 3451 9465
TIME...MOT...LOC 0542Z 192DEG 33KT 3443 9481

13

Local storm report, Mar 17, 12:52 AM CDT, 1 hour 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1252 AM CDT WED MAR 17 2021

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

1238 AM     HAIL             EL DORADO               33.22N 92.66W
03/17/2021  E0.88 INCH       UNION              AR   LAW ENFORCEMENT

            DIME TO NICKEL SIZE HAIL REPORTED BY EL
            DORADO PD.

&&

25

Special weather statement, Mar 17, 1:30 AM CDT, 1 hour 11 minutes before

Special Weather Statement
National Weather Service Shreveport LA
130 AM CDT Wed Mar 17 2021

ARZ070-LAZ001-TXZ112-126-170715-
Miller AR-Caddo LA-Cass TX-Marion TX-
130 AM CDT Wed Mar 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN MILLER COUNTY...
NORTHWESTERN CADDO PARISH...MARION AND SOUTHEASTERN CASS COUNTIES
UNTIL 215 AM CDT...

At 130 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Harleton to near Smithland. Movement was
northeast at 35 mph.

Half inch hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Vivian, Jefferson, Linden, Rodessa, Ida, Bivins, Lodi, Smithland,
Ravanna, McLeod, Berea, Kildare, Gray, Fairview, Pruett and Kiblah.

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 3303 9433 3310 9386 3307 9383 3304 9383
      3274 9408 3274 9414 3273 9415 3272 9423
      3275 9424 3275 9428 3273 9429 3273 9432
      3270 9435 3269 9445 3269 9451 3273 9457
TIME...MOT...LOC 0630Z 220DEG 31KT 3272 9450 3277 9413

13

Special weather statement, Mar 17, 2:01 AM CDT, 40 minutes before

Special Weather Statement
National Weather Service Shreveport LA
201 AM CDT Wed Mar 17 2021

ARZ070>073-170745-
Lafayette AR-Union AR-Miller AR-Columbia AR-
201 AM CDT Wed Mar 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN MILLER...
LAFAYETTE...NORTHWESTERN UNION AND CENTRAL COLUMBIA COUNTIES UNTIL
245 AM CDT...

At 200 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Macedonia to near Ida. Movement was northeast
at 40 mph.

Half inch hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Magnolia, Stamps, Waldo, Lewisville, McNeil, Bradley, Buckner,
Garland, Bussey, Mount Holly, Smithland, Canfield, Village,
Macedonia, Calhoun, Mount Vernon, Lerch, Gin City, Laughlin and
College Hill.

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 3328 9294 3302 9383 3302 9397 3348 9373
      3347 9348 3345 9348 3344 9342 3345 9312
      3338 9312 3337 9291
TIME...MOT...LOC 0700Z 239DEG 44KT 3319 9332 3302 9386

13

Special weather statement, Mar 17, 2:41 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Shreveport LA
241 AM CDT Wed Mar 17 2021

ARZ060-070-071-TXZ112-170830-
Hempstead AR-Lafayette AR-Miller AR-Cass TX-
241 AM CDT Wed Mar 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL HEMPSTEAD...
MILLER...NORTH CENTRAL LAFAYETTE AND NORTHEASTERN CASS COUNTIES UNTIL
330 AM CDT...

At 240 AM CDT, Doppler radar was tracking a strong thunderstorm near
Queen City, or near Atlanta, moving northeast at 50 mph.

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

Locations impacted include...
Texarkana, Atlanta, Lewisville, Queen City, Fouke, Garland,
Mandeville, Genoa, Brightstar, Mount Pleasant, Bloomburg, Domino,
Pleasant Hill, Hervey, Spirit Lake, Homan, Fort Lynn and Piney Grove.

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 3341 9345 3306 9406 3313 9426 3329 9413
      3329 9411 3331 9411 3330 9410 3331 9409
      3329 9409 3330 9406 3329 9405 3327 9404
      3340 9404 3359 9389
TIME...MOT...LOC 0740Z 227DEG 45KT 3316 9407

13

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 1:30 AM CDT	Special Weather Statement	SHV	Marion	45 min
Mar 17, 2:45 AM CDT	Lake Wind Advisory	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	40 hr
Mar 17, 6:12 AM CDT	Severe Thunderstorm Warning	SHV	Camp, Franklin, Smith, Titus, Wood	63 min
Mar 17, 6:49 AM CDT	Special Weather Statement	SHV	Cherokee, Smith	41 min
Mar 17, 6:56 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Franklin, Morris, Red River, Titus	49 min
Mar 17, 7:08 AM CDT	Tornado Warning	SHV	Bowie, Cass, Morris, Red River, Titus	37 min
Mar 17, 7:12 AM CDT	Special Weather Statement	SHV	Camp, Gregg, Morris, Upshur	48 min
Mar 17, 7:32 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Gregg, Harrison, Marion, Panola, Rusk and 2 more	58 min
Mar 17, 7:36 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass, Morris	54 min
Mar 17, 7:43 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Nacogdoches, Panola, Rusk, Smith	62 min
Mar 17, 7:59 AM CDT	Special Weather Statement	SHV	Cass	31 min
Mar 17, 8:27 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Cherokee, Nacogdoches, Rusk, Shelby	63 min
Mar 17, 8:34 AM CDT	Severe Thunderstorm Warning	SHV	Cass, Gregg, Harrison, Marion, Panola, Rusk	56 min
Mar 17, 8:40 AM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Panola, Rusk, Shelby	44 min
Mar 17, 9:29 AM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Panola, Rusk, San Augustine, Shelby	61 min
Mar 17, 11:42 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Sabine, San Augustine	48 min
Mar 17, 9:31 AM CDT	Special Weather Statement	SHV	Bossier, Caddo, Webster	59 min
Mar 17, 10:29 AM CDT	Special Weather Statement	SHV	De Soto	61 min
Mar 17, 10:36 AM CDT	Special Weather Statement	SHV	Claiborne, Webster	39 min
Mar 17, 11:02 AM CDT	Special Weather Statement	SHV	Bienville, Red River, Webster	43 min
Mar 17, 11:46 AM CDT	Special Weather Statement	SHV	Bienville, Jackson, Red River	59 min
Mar 17, 12:36 PM CDT	Special Weather Statement	SHV	Natchitoches, Red River, Sabine	39 min
Mar 17, 2:08 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Lincoln, Ouachita, Union	52 min
Mar 17, 2:16 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Lincoln, Union	44 min
Mar 17, 2:32 PM CDT	Tornado Warning	SHV	Union	43 min
Mar 17, 2:58 PM CDT	Tornado Warning	SHV	Lincoln, Ouachita, Union	47 min
Mar 17, 3:12 PM CDT	Tornado Warning	SHV	Jackson, Lincoln, Ouachita, Union	48 min
Mar 17, 3:34 PM CDT	Tornado Warning	SHV	Union	10 min
Mar 17, 12:14 AM CDT	Special Weather Statement	SHV	Union	46 min
Mar 17, 12:21 AM CDT	Severe Thunderstorm Warning	SHV	Union	39 min
Mar 17, 2:01 AM CDT	Special Weather Statement	SHV	Columbia, Lafayette	44 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 16, 11:48 PM CDT	Special Weather Statement	SHV	McCurtain	42 min
Mar 17, 12:43 AM CDT	Special Weather Statement	SHV	McCurtain	17 min

Nearby

Special Weather Statements in Arkansas, 2021 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.