Alert archive / Louisiana / Special Weather Statements in 2017

Special Weather Statement, NWS Shreveport, LA

March 27, 2017Caldwell Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at Mar 27, 2017, 9:22 PM CDT for Caldwell Parish, Louisiana. It was in force for 68 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 27, 2017, 9:22 PM CDT (02:22 UTC)
Expired
Mar 27, 2017, 10:30 PM CDT
In force
68 min
Issued by
NWS Shreveport, LA

County Caldwell Parish, LA

The radar

The Ft Polk radar (KPOE), 133 km from the middle of the area, began a volume at 02:22 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

Jackson, MS (KJAN), launched 00:00Z, 2.4 hours before the alert went out and 183 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, Jackson, MS at 00:00Z on 2017-03-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1116 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, Jackson, MS at 00:00Z on 2017-03-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 159 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
1116 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
771 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
159 m²/s²
0-3 km storm-relative helicity
209 m²/s²
Significant tornado parameter
1.0
Supercell composite
6.2

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 27, 7:51 PM CDT, 1 hour 31 minutes earlier.

Area forecast discussion, Mar 27, 7:51 PM CDT, 1 hour 31 minutes before
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Hazardous weather outlook, Mar 27, 11:52 AM CDT, 9 hours 30 minutes before
Hazardous Weather Outlook
National Weather Service Shreveport LA
1152 AM CDT Mon Mar 27 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>167-281700-
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-
1152 AM CDT Mon Mar 27 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...This Afternoon and Tonight...

Isolated to scattered showers and thunderstorms will be possible
this afternoon ahead of a cold front that will slowly push
southeast across the region. Convection should be limited to
Southwest Arkansas, North Louisiana, and Deep East Texas.
However, no hazardous weather is expected.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday...

Showers and thunderstorms to increase in intensity on Wednesday
afternoon and evening ahead of an upper-level storm system.
Severe thunderstorms possible as convection spreads east across
the region. Damaging winds, isolated tornadoes, hail, and locally
heavy rainfall will be possible, with the severe weather threat
diminishing from west to east late Wednesday night.

.SPOTTER INFORMATION STATEMENT...

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

05

In the hours before

Special weather statement, Mar 27, 4:38 PM CDT, 4 hours 44 minutes before
Special Weather Statement
National Weather Service Shreveport LA
438 PM CDT MON MAR 27 2017

LAZ019>022-272230-
Caldwell-Winn-La Salle-Grant-
438 PM CDT MON MAR 27 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN GRANT...SOUTH
CENTRAL CALDWELL...LA SALLE AND SOUTHEASTERN WINN PARISHES...

At 436 PM CDT, a strong thunderstorm was located 15 miles southeast
of Winnfield, moving northeast at 20 mph. Hail to one half inch
diameter possible with this storms, and other storms developing in
the Jena and Olla areas.

Locations impacted include...
Jena, Olla, Midway, Urania, Tullos, Georgetown, Spaulding, Zenoria,
Burlington, Standard, Rochelle and Kelly.

LAT...LON 3161 9251 3177 9262 3207 9201 3158 9201
TIME...MOT...LOC 2136Z 240DEG 16KT 3173 9250

VII
Special weather statement, Mar 27, 5:43 PM CDT, 3 hours 39 minutes before
Special Weather Statement
National Weather Service Shreveport LA
543 PM CDT MON MAR 27 2017

LAZ013-019-272345-
Winn-Jackson-
543 PM CDT MON MAR 27 2017

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN JACKSON AND
NORTHEASTERN WINN PARISHES...

At 542 PM CDT, a strong thunderstorm was located near Winnfield,
moving northeast at 20 mph.

Winds in excess of 30 mph and half inch hail are possible with this
storm.

Locations impacted include...
Winnfield, Dodson, Sikes, Joyce and Hudson.

LAT...LON 3187 9262 3204 9281 3233 9234 3229 9231
      3203 9231
TIME...MOT...LOC 2242Z 233DEG 18KT 3199 9262

vii
Special weather statement, Mar 27, 8:07 PM CDT, 1 hour 15 minutes before
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Special weather statement, Mar 27, 9:22 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Mar 28, 3:49 PM CDTLake Wind AdvisorySHVAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more27 hr
Mar 27, 8:07 PM CDTSpecial Weather StatementSHVCaldwell23 min

Nearby

Special Weather Statements in Louisiana, 2017Every special weather statement 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.