Alert archive / Louisiana / Special Weather Statements in 2017

Special Weather Statement, NWS Lake Charles, LA

December 20, 2017Avoyelles Parish, Louisiana

NWS Lake Charles, LA issued this special weather statement at Dec 20, 2017, 3:59 AM CST for Avoyelles Parish, Louisiana. It was in force for 46 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 20, 2017, 3:59 AM CST (09:59 UTC)
Expired: Dec 20, 2017, 4:45 AM CST
In force: 46 min
Issued by: NWS Lake Charles, LA

County Avoyelles Parish, LA

The radar

The Ft Polk radar (KPOE), 105 km from the middle of the area, began a volume at 10:01 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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 10.0 hours before the alert went out and 163 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: 888 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 503 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.7

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 Lake Charles, LA wrote its last area forecast discussion before this special weather statement went out at Dec 20, 3:53 AM CST, 6 minutes earlier.

Area forecast discussion, Dec 20, 3:53 AM CST, 6 minutes before

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Hazardous weather outlook, Dec 19, 4:58 AM CST, 23 hours 1 minute before

Hazardous Weather Outlook
National Weather Service Lake Charles LA
458 AM CST Tue Dec 19 2017

LAZ027>033-041>045-052>055-073-074-TXZ180-201-215-216-259>262-
201100-
Vernon-Rapides-Avoyelles-Beauregard-Allen-Evangeline-St. Landry-
Calcasieu-Jefferson Davis-Acadia-Lafayette-Upper St. Martin-
Vermilion-Iberia-St. Mary-Lower St. Martin-West Cameron-
East Cameron-Tyler-Hardin-Jefferson-Orange-Northern Jasper-
Northern Newton-Southern Jasper-Southern Newton-
458 AM CST Tue Dec 19 2017

This Hazardous Weather Outlook is for portions of central
Louisiana, south central Louisiana, southwest Louisiana, west
central Louisiana, and southeast Texas.

.DAY ONE...Today and Tonight
Areas of dense fog will persist through the late morning hours.
Storms over south central Texas this morning will move east
northeast and into southeast Texas and southern Louisiana today
ahead of a cold front that is scheduled to move through around
sunrise on Wednesday morning. Areas of fog are expected to develop
this evening ahead of the cold front.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday
Very progressive pattern in the atmosphere as we will only get
part of Wednesday and Thursday free from storms before another
cold front moves through late Friday into Saturday. Look for more
showers and thunderstorms ahead of this front. Much colder air
will spill into the region over the weekend driving morning lows
back into the 40s over the weekend. Morning temperatures will be
in the 30s to start out the new week.

.SPOTTER INFORMATION STATEMENT...

GMZ430-432-435-450-452-455-470-472-475-201100-
Sabine Lake-Calcasieu Lake-Vermilion Bay-
Coastal waters from Cameron LA to High Island TX out 20 NM-
Coastal waters from Intracoastal City to Cameron LA out 20 NM-
Coastal waters from Lower Atchafalaya River to Intracoastal City
LA out 20 NM-
Waters from Cameron LA to High Island TX from 20 to 60 NM-
Waters from  Intracoastal City to Cameron LA from 20 to 60 NM-
Waters from Lower Atchafalaya River to Intracoastal City LA from
20 to 60 NM-
458 AM CST Tue Dec 19 2017

This Hazardous Weather Outlook is for portions of Gulf of Mexico.

.DAY ONE...Today and Tonight
Areas of dense fog will continue through the noon hour before
conditions improve. But fog will linger in the coastal waters
through the day and into the evening hours. Look for some showers
and thunderstorms later today and into tonight ahead of a cold
front Wednesday morning around sunrise. Winds becoming west with
rains ending.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday
We will have a brief break from the rains over the gulf on
Wednesday into Thursday. Storms return late on Thursday into
Friday. The next front will move through late Friday into Saturday
morning but the chance for some showers will persist into the
weekend.

.SPOTTER INFORMATION STATEMENT...

In the hours before

Special weather statement, Dec 20, 12:40 AM CST, 3 hours 19 minutes before

Special Weather Statement
National Weather Service Lake Charles LA
1240 AM CST WED DEC 20 2017

TXZ201-215-216-261-200730-
Orange TX-Jefferson TX-Hardin TX-Southern Jasper TX-
1240 AM CST WED DEC 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN JEFFERSON...
SOUTHEASTERN HARDIN...NORTHWESTERN ORANGE AND SOUTHEASTERN JASPER
COUNTIES UNTIL 130 AM CST...

At 1240 AM CST, Doppler radar was tracking a strong thunderstorm near
Sour Lake, moving northeast at 50 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Beaumont, Lumberton, Silsbee, Sour Lake, Evadale, Bevil Oaks,
Lakeview and Weiss Bluff.

LAT...LON 3018 9459 3043 9394 3034 9391 3026 9392
      3005 9444 3011 9445 3011 9455
TIME...MOT...LOC 0640Z 244DEG 44KT 3014 9446

06

Special weather statement, Dec 20, 12:45 AM CST, 3 hours 14 minutes before

Special Weather Statement
National Weather Service Lake Charles LA
1245 AM CST WED DEC 20 2017

LAZ027-TXZ180-259-260-200745-
Vernon LA-Northern Newton TX-Northern Jasper TX-Tyler TX-
1245 AM CST WED DEC 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN VERNON PARISH...EAST
CENTRAL TYLER...NORTHERN NEWTON AND NORTHEASTERN JASPER COUNTIES
UNTIL 145 AM CST...

At 1245 AM CST, Doppler radar was tracking strong thunderstorms along
a line extending from near Mayflower to near Town Bluff. Movement was
east at 35 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Jasper, Newton, Anacoco, Toledo Bend Dam, Town Bluff, Burkeville,
Farrsville, Magnolia Springs, Burr Ferry, Mayflower, Spurger,
Jamestown, Roganville, Harrisburg, Stringtown, Wiergate and Evans.

LAT...LON 3131 9321 3123 9323 3077 9368 3067 9431
      3115 9384 3117 9377 3117 9358 3119 9355
      3123 9354
TIME...MOT...LOC 0645Z 256DEG 32KT 3112 9382 3074 9418

06

Special weather statement, Dec 20, 1:28 AM CST, 2 hours 31 minutes before

Special Weather Statement
National Weather Service Lake Charles LA
128 AM CST WED DEC 20 2017

LAZ030-031-041-TXZ215-216-260>262-200830-
Calcasieu LA-Allen LA-Beauregard LA-Orange TX-Jefferson TX-
Southern Newton TX-Northern Newton TX-Southern Jasper TX-
128 AM CST WED DEC 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR BEAUREGARD...NORTHWESTERN
CALCASIEU AND NORTHWESTERN ALLEN PARISHES...NORTHERN JEFFERSON...
SOUTHWESTERN NEWTON...ORANGE AND SOUTHEASTERN JASPER COUNTIES UNTIL
230 AM CST...

At 128 AM CST, Doppler radar was tracking strong thunderstorms along
a line extending from near Gist to near Pine Forest to 6 miles
northwest of Hamshire. Movement was northeast at 60 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Beaumont, Port Arthur, Orange, Nederland, Port Neches, Vidor, Bridge
City, West Orange, Vinton, Dry Creek, Singer, Deweyville, Evadale,
Central Gardens, Sugartown, De Quincy, Ragley, Starks, Fields and
Mauriceville.

LAT...LON 3017 9408 3040 9407 3080 9335 3088 9292
      3073 9297 2998 9382 2999 9386 2998 9384
      2997 9384 2989 9444
TIME...MOT...LOC 0728Z 239DEG 54KT 3033 9397 3022 9401 2994 9436

06

Special weather statement, Dec 20, 1:31 AM CST, 2 hours 28 minutes before

Special Weather Statement
National Weather Service Lake Charles LA
131 AM CST WED DEC 20 2017

LAZ027-028-030-TXZ260-200830-
Beauregard LA-Vernon LA-Rapides LA-Northern Newton TX-
131 AM CST WED DEC 20 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN RAPIDES...NORTH
CENTRAL BEAUREGARD...VERNON PARISHES IN WEST CENTRAL LOUISIANA AND
NORTHEASTERN NEWTON COUNTIES UNTIL 230 AM CST...

At 131 AM CST, Doppler radar was tracking strong thunderstorms along
a line extending from near Kurthwood to near Stringtown. Movement was
east at 45 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Alexandria, Leesville, Rosepine, Boyce, Anacoco, Fort Polk,
Alexandria International Airport, Slagle, Hineston, Pitkin, Deridder,
Ball, New Llano, Tioga, Timber Trails, Hutton, Flatwoods, Otis,
Kurthwood and Sieper.

LAT...LON 3145 9235 3092 9294 3079 9377 3136 9328
      3137 9303 3135 9295 3137 9295 3137 9292
      3139 9291 3139 9289 3142 9287 3145 9270
      3145 9268 3140 9269 3139 9265
TIME...MOT...LOC 0731Z 258DEG 40KT 3133 9311 3086 9364

06

Local storm report, Dec 20, 3:00 AM CST, 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
300 AM CST WED DEC 20 2017

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

0220 AM     TORNADO          DE QUINCY               30.45N 93.44W
12/20/2017                   CALCASIEU          LA   LAW ENFORCEMENT

            TREE DOWN ON HOUSE 200 BLOCK OF DUFF.NUMEROUS TREES DOWN
            GRAND AND 4TH STREET....300 BLOCK OF COFFEE...AND EAST
            BAPTIST AT 163 LOUISE ROAD HAS DAMAGE. NUMEROUS TREES
            DOWN IN DE QUINCY.

&&

FNAVEJAR

Special weather statement, Dec 20, 3:59 AM CST, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 20, 1:28 AM CST	Special Weather Statement	LCH	Beauregard	62 min
Dec 20, 1:31 AM CST	Special Weather Statement	LCH	Vernon	59 min
Dec 20, 2:10 AM CST	Tornado Warning	LCH	Beauregard, Calcasieu	35 min
Dec 20, 2:47 AM CST	Tornado Warning Tornado observed	LCH	Allen	28 min
Dec 20, 3:05 AM CST	Severe Thunderstorm Warning	LCH	Saint Landry	32 min
Dec 20, 3:08 AM CST	Severe Thunderstorm Warning	LCH	Allen, Evangeline	52 min
Dec 20, 5:46 AM CST	Special Marine Warning	LCH		119 min
Dec 20, 12:40 AM CST	Special Weather Statement	LCH	Hardin	50 min
Dec 20, 12:45 AM CST	Special Weather Statement	LCH	Jasper, Newton	60 min

Nearby

Special Weather Statements in Louisiana, 2017 Every 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.