Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

December 18, 2021Smith County, Texas

NWS Shreveport, LA issued this special weather statement at Dec 18, 2021, 7:02 AM CST for Smith County, Texas. It was in force for 43 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
Dec 18, 2021, 7:02 AM CST (13:02 UTC)
Expired
Dec 18, 2021, 7:45 AM CST
In force
43 min
Issued by
NWS Shreveport, LA
Hail
0.50 in
Wind
50

County Smith County, TX

The radar

The Shreveport radar (KSHV), 117 km from the middle of the area, began a volume at 13:05 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 12:00Z, 1.0 hours before the alert went out and 125 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-pSkew-T log-p diagram, Shreveport, LA at 12:00Z on 2021-12-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 181 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 12:00Z on 2021-12-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 134 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
181 J/kg
Mixed-layer CIN
-88 J/kg
Mixed-layer LCL
610 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
134 m²/s²
0-3 km storm-relative helicity
113 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.0

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 Dec 18, 5:57 AM CST, 1 hour 5 minutes earlier.

Area forecast discussion, Dec 18, 5:57 AM CST, 1 hour 5 minutes before
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Hazardous weather outlook, Dec 18, 4:38 AM CST, 2 hours 24 minutes before
Hazardous Weather Outlook
National Weather Service Shreveport LA
438 AM CST Sat Dec 18 2021

ARZ073-LAZ001>006-010>014-017>022-TXZ126-136>138-149>153-165>167-
191200-
Union-Caddo-Bossier-Webster-Claiborne-Lincoln-De Soto-Red River-
Bienville-Jackson-Ouachita-Sabine-Natchitoches-Winn-Grant-
Caldwell-La Salle-Marion-Smith-Gregg-Harrison-Cherokee-Rusk-
Panola-Nacogdoches-Shelby-Angelina-San Augustine-
438 AM CST Sat Dec 18 2021

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

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

Scattered thunderstorms will become more widespread across the
area today as a strong cold front moves across the region. A few
storms could be severe today from this morning through the mid-
afternoon hours, mainly south of a line from Tyler to El Dorado.
Damaging winds and large hail will be the primary threats. In
addition, locally heavy rainfall may result in isolated flooding.

Winds will become northerly after the passage of the cold front
and will increase in speed to between 15 and 25 mph with
occasional higher gusts. Therefore, a Lake Wind Advisory is in
effect until 6 PM CST for all of East Texas and portions of
extreme Northwest Louisiana. The wind speeds should diminish early
this evening.

.DAYS TWO THROUGH SEVEN...Sunday through Friday...

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel, amateur radio
operators, and storm spotters may be needed today through this
afternoon.

ARZ050-051-059>061-070>072-OKZ077-TXZ096-097-108>112-124-125-
191200-
Sevier-Howard-Little River-Hempstead-Nevada-Miller-Lafayette-
Columbia-McCurtain-Red River-Bowie-Franklin-Titus-Camp-Morris-
Cass-Wood-Upshur-
438 AM CST Sat Dec 18 2021

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

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

Scattered thunderstorms will become more widespread across the
area today as a strong cold front moves across the region. Locally
heavy rainfall may result in isolated flooding.

Winds will become northerly after the passage of the cold front
and will increase in speed to between 15 and 25 mph with
occasional higher gusts. Therefore, a Lake Wind Advisory is in
effect until 6 PM CST for all of East Texas, Southeast Oklahoma,
and portions of Southwest Arkansas. The wind speeds should
diminish early this evening.

.DAYS TWO THROUGH SEVEN...Sunday through Friday...

Below freezing temperatures are possible across much of the area
during the overnight and early morning hours Sunday through
Wednesday. Otherwise, no hazardous weather is expected at this
time.

.SPOTTER INFORMATION STATEMENT...

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

09

In the hours before

Special weather statement, Dec 18, 6:28 AM CST, 34 minutes before
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Special weather statement, Dec 18, 7:02 AM CST, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Dec 18, 3:03 AM CSTLake Wind AdvisorySHVAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 14 more15 hr
Dec 18, 6:28 AM CSTSpecial Weather StatementSHVSmith32 min
Dec 18, 7:26 AM CSTSpecial Weather StatementSHVGregg34 min
Dec 18, 7:54 AM CSTSpecial Weather StatementSHVRusk36 min
Dec 18, 8:00 AM CSTSpecial Weather StatementSHVRusk60 min
Dec 18, 8:22 AM CSTSpecial Weather StatementSHVNacogdoches38 min
Dec 18, 8:52 AM CSTSpecial Weather StatementSHVNacogdoches, Panola, Shelby38 min
Dec 18, 9:38 AM CSTSpecial Weather StatementSHVShelby37 min
Dec 18, 11:02 AM CSTSpecial Weather StatementSHVAngelina43 min
Dec 18, 10:30 AM CSTSpecial Weather StatementSHVRed River45 min

Nearby

Special Weather Statements in Texas, 2021Every 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.