Alert archive / Texas / Flash Flood Warnings in 2023

Flash Flood Warning 18, NWS Shreveport, LA

April 20, 2023Smith County, Texas

NWS Shreveport, LA issued this flash flood warning at Apr 20, 2023, 7:23 PM CDT for Smith County, Texas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 20, 2023, 7:23 PM CDT (00:23 UTC)
Expired: Apr 20, 2023, 10:30 PM CDT
In force: 3 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

County Smith County, TX

The radar

The Shreveport radar (KSHV), 134 km from the middle of the area, began a volume at 00:22 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

Fort Worth, TX (KFWD), launched 00:00Z, 0.4 hours before the alert went out and 196 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1791 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Apr 20, 6:55 PM CDT, 28 minutes earlier.

Area forecast discussion, Apr 20, 6:55 PM CDT, 28 minutes before

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Hazardous weather outlook, Apr 20, 12:46 PM CDT, 6 hours 37 minutes before

Hazardous Weather Outlook
National Weather Service Shreveport LA
1246 PM CDT Thu Apr 20 2023

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-
1246 PM CDT Thu Apr 20 2023

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

.DAY ONE...This afternoon and tonight.

Strong to severe thunderstorms will begin to develop this afternoon
across much of the Four-State region and become more widespread this
evening into the overnight hours. Some of these storms could produce
large hail and damaging thunderstorm wind gusts. While conditions are
not conducive for a widespread tornado outbreak, isolated tornadoes
cannot be ruled out. In addition to the severe weather threat will be
an excessive heavy rainfall threat this afternoon through overnight
across much of the region. That excessive heavy rainfall threat will
shift farther south and east into more of North Central and Northeast
Louisiana the first half of Friday. Low-lying and poor drainage flood
prone areas will be the most susceptible to flash flooding late today
through tonight and into early Friday.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

While showers and thunderstorms will be possible across portions of
the Four-State Region next week, atmospheric instability does not
appear significant enough or the development of strong to severe
thunderstorms at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will most likely be needed this afternoon into the
evening and overnight hours for the threat of severe thunderstorms.

19

In the hours before

Special weather statement, Apr 20, 3:30 PM CDT, 3 hours 53 minutes before

Special Weather Statement
National Weather Service Shreveport LA
Issued by National Weather Service Memphis TN
330 PM CDT Thu Apr 20 2023

OKZ077-202045-
McCurtain OK-
330 PM CDT Thu Apr 20 2023

...A strong thunderstorm will impact portions of north central
McCurtain County through 345 PM CDT...

At 330 PM CDT, Doppler radar was tracking a strong thunderstorm 13
miles south of Whitesboro, or 24 miles east of Clayton, moving
northeast at 35 mph.

HAZARD...Winds in excess of 40 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Battiest.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
southeastern Oklahoma.

&&

LAT...LON 3451 9460 3438 9496 3450 9505 3451 9505
TIME...MOT...LOC 2030Z 238DEG 28KT 3450 9495

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

AC3

Special weather statement, Apr 20, 3:45 PM CDT, 3 hours 38 minutes before

Special Weather Statement
National Weather Service Shreveport LA
Issued by National Weather Service Memphis TN
345 PM CDT Thu Apr 20 2023

OKZ077-202130-
McCurtain OK-
345 PM CDT Thu Apr 20 2023

...A strong thunderstorm will impact portions of northwestern
McCurtain County through 430 PM CDT...

At 345 PM CDT, Doppler radar was tracking a strong thunderstorm 12
miles southeast of Nashoba, or 23 miles southeast of Clayton, moving
northeast at 15 mph.

HAZARD...Winds in excess of 40 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Battiest and Pickens.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
southeastern Oklahoma.

&&

LAT...LON 3451 9472 3443 9467 3431 9504 3450 9505
      3451 9503
TIME...MOT...LOC 2045Z 245DEG 13KT 3441 9502

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH

AC3

Special weather statement, Apr 20, 4:07 PM CDT, 3 hours 16 minutes before

Special Weather Statement
National Weather Service Shreveport LA
407 PM CDT Thu Apr 20 2023

ARZ050-059-OKZ077-202130-
Sevier AR-Little River AR-McCurtain OK-
407 PM CDT Thu Apr 20 2023

...A strong thunderstorm will impact portions of northwestern Little
River, northwestern Sevier and southeastern McCurtain Counties
through 430 PM CDT...

At 407 PM CDT, Doppler radar was tracking a strong thunderstorm 9
miles southeast of Idabel, or 18 miles west of Foreman, moving
northeast at 30 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
De Queen, Horatio, Lockesburg, Haworth, Eagletown, Bokhoma, Moon,
Cerrogordo, Harris, Goodwater, Shinewell, America, West Line and West
Otis.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
southwestern Arkansas...southeastern Oklahoma...and northeastern
Texas.

&&

LAT...LON 3418 9439 3397 9419 3369 9470 3384 9484
TIME...MOT...LOC 2107Z 231DEG 27KT 3381 9470

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

44

Local storm report, Apr 20, 4:47 PM CDT, 2 hours 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
447 PM CDT THU APR 20 2023

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

0442 PM     HAIL             HAWORTH                 33.85N 94.65W
04/20/2023  E0.88 INCH       MCCURTAIN          OK   PUBLIC

            DIME TO NICKEL SIZE HAIL FELL AT THE COUNTRY
            STORE CONVENIENCE STORE IN HAWORTH.

&&

15

Special weather statement, Apr 20, 5:28 PM CDT, 1 hour 55 minutes before

Special Weather Statement
National Weather Service Shreveport LA
528 PM CDT Thu Apr 20 2023

ARZ050-059-202315-
Sevier AR-Little River AR-
528 PM CDT Thu Apr 20 2023

...A strong thunderstorm will impact portions of northwestern Little
River and central Sevier Counties through 615 PM CDT...

At 527 PM CDT, Doppler radar was tracking a strong thunderstorm near
Horatio, moving northeast at 25 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
De Queen, Horatio, Lockesburg, Geneva and West Otis.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
southwestern Arkansas.

&&

LAT...LON 3417 9422 3399 9408 3380 9447 3381 9448
      3397 9447
TIME...MOT...LOC 2227Z 234DEG 20KT 3390 9446

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

44

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 7:15 PM CDT	Special Weather Statement	SHV	Titus	30 min
Apr 20, 7:15 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Smith, Upshur	60 min
Apr 20, 7:20 PM CDT	Special Weather Statement	SHV	Smith	40 min
Apr 20, 7:25 PM CDT	Flash Flood Warning	SHV	Bowie, Franklin, Morris, Red River, Titus	3 hr
Apr 20, 7:26 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass	49 min
Apr 20, 7:26 PM CDT	Tornado Warning	SHV	Gregg, Smith, Upshur	49 min
Apr 20, 8:03 PM CDT	Special Weather Statement	SHV	Smith	57 min
Apr 20, 8:09 PM CDT	Flash Flood Warning	SHV	Bowie	3 hr
Apr 20, 8:11 PM CDT	Severe Thunderstorm Warning	SHV	Cass	49 min
Apr 20, 8:13 PM CDT	Special Weather Statement	SHV	Upshur	62 min
Apr 20, 8:19 PM CDT	Special Weather Statement	SHV	San Augustine	56 min
Apr 21, 11:27 AM CDT	River Flood Warning	SHV	Franklin, Morris, Red River, Titus	24 hr
Apr 21, 11:35 AM CDT	River Flood Warning	SHV	Angelina, Cherokee, Nacogdoches	24 hr
Apr 20, 9:37 PM CDT	Special Weather Statement	SHV	Sabine	68 min
Apr 20, 8:54 PM CDT	Special Weather Statement	SHV	Columbia, Lafayette	51 min
Apr 20, 9:37 PM CDT	Special Weather Statement	SHV	Columbia, Union	53 min

Nearby

Flash Flood Warnings in Texas, 2023 Every flash flood warning in 2023

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.