Alert archive / Louisiana / Special Weather Statements in 2018

Special Weather Statement, NWS Lake Charles, LA

August 7, 2018Assumption Parish, Louisiana

NWS Lake Charles, LA issued this special weather statement at Aug 7, 2018, 5:17 PM CDT for Assumption Parish, Louisiana. It was in force for 13 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
Aug 7, 2018, 5:17 PM CDT (22:17 UTC)
Expired
Aug 7, 2018, 5:30 PM CDT
In force
13 min
Issued by
NWS Lake Charles, LA

County Assumption Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.3 hours before the alert went out and 152 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, Slidell Radar S, LA at 12:00Z on 2018-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2151 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, Slidell Radar S, LA at 12:00Z on 2018-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.1939Sfc1 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
2151 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
858 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
13 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Lake Charles, LA wrote its last area forecast discussion before this special weather statement went out at Aug 7, 3:58 PM CDT, 1 hour 19 minutes earlier.

Area forecast discussion, Aug 7, 3:58 PM CDT, 1 hour 19 minutes before
Area Forecast Discussion
National Weather Service Lake Charles LA
358 PM CDT Tue Aug 7 2018

.DISCUSSION...
Despite model guidance depicting an abrupt end to ongoing
convection prior to 00Z, will maintain a small PoP to account for
any activity that lingers inland into this evening. Isolated to
scattered convection will likely persist over the coastal waters
through the night.

Upper low continues to sink to the SW over the NW Gulf roughly
parallel to the TX coast per water vapor imagery. This feature is
progged to continue to the SW tonight, and will be over the west
central Gulf by tomorrow. A shear axis or weakness in the height
field will remain overhead in its wake, and while overall moisture
quality is expected to degrade a bit, sufficient moisture along
with diurnal instability should allow for at least isolated to
scattered convection tomorrow afternoon. Less coverage than the
previous two days.

Overall trend has been for decreasing PoPs on THU, but chose not
to deviate too much from the previous forecast with some
discrepancies in model guidance regarding the magnitude of the
shortwave trof digging into the Lower MS River Valley. Disparities
continue through the rest of the forecast period, but there is
broad consensus on good rain chances FRI and SAT given proximity
of mean trof axis and stalled front with associated MSTR pool.
Rain chances begin to decrease SUN into MON amid building ridge
aloft.

No significant changes in temperatures are expected, but highs
will be moderated FRI and SAT with the anticipated increase in
clouds/PCPN.

13

&&

.MARINE...
High pressure stretching west across the northern Gulf coast will
maintain a generally light south to southeast flow the next
couple of days, with winds becoming more south and then southwest
during the latter part of the week and through the weekend as the
high settles south into the Gulf. Isolated to scattered showers
and thunderstorms are possible through mid week, with higher rain
chances expected toward the end of the week and through the
weekend as an upper level trough approaches from the northwest.

13

&&

.PRELIMINARY POINT TEMPS/POPS...
AEX  71  94  71  93 /  20  20  10  50
LCH  75  91  76  90 /  20  40  10  50
LFT  75  92  75  92 /  20  40  10  50
BPT  77  91  77  90 /  20  30  10  40

&&

.LCH WATCHES/WARNINGS/ADVISORIES...
LA...None.
TX...None.
GM...None.

&&
Hazardous weather outlook, Aug 7, 3:23 PM CDT, 1 hour 54 minutes before
Hazardous Weather Outlook
National Weather Service Lake Charles LA
323 PM CDT Tue Aug 7 2018

LAZ027>033-041>045-052>055-073-074-TXZ180-201-215-216-259>262-
081100-
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-
323 PM CDT Tue Aug 7 2018

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

.DAY ONE...This Afternoon and Tonight

Scattered to numerous showers and thunderstorms will continue
this afternoon into early evening, before dissipating around or
shortly after sunset. While severe storms are not anticipated,
stronger storms will be accompanied by occasional to frequent
cloud to ground lightning, gusty winds, and brief heavy downpours.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Isolated to scattered showers and thunderstorms are expected
Wednesday and Thursday, with increasing rain chances expected
Friday and through the weekend as an upper level trough digs into
the Lower Mississippi River Valley. Rain chances decrease on
Monday as the trough lifts out and high pressure builds overhead.

Severe thunderstorms are not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

GMZ430-432-435-450-452-455-470-472-475-081100-
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-
323 PM CDT Tue Aug 7 2018

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

.DAY ONE...This Afternoon and Tonight

Isolated to scattered showers and thunderstorms will continue
this afternoon and tonight. While severe storms are not
anticipated, stronger storms will be accompanied by occasional to
frequent cloud to water lightning, gusty winds, and brief heavy
downpours.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Isolated to scattered showers and thunderstorms are expected
Wednesday and Thursday, with increasing rain chances expected
Friday and through the weekend as an upper level trough digs into
the Lower Mississippi River Valley. Rain chances decrease on
Monday as the trough lifts out and high pressure builds overhead.

Severe thunderstorms are not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

13

In the hours before

Special weather statement, Aug 7, 2:28 PM CDT, 2 hours 49 minutes before
Special Weather Statement
National Weather Service Lake Charles LA
228 PM CDT TUE AUG 7 2018

TXZ180-201-259-072015-
Hardin-Northern Jasper-Tyler-
228 PM CDT TUE AUG 7 2018

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN TYLER AND NORTH
CENTRAL HARDIN COUNTIES...

At 228 PM CDT, a strong thunderstorm was located near Warren, moving
north at 20 mph.

Winds in excess of 30 mph are possible with this storm.

Locations impacted include...
Warren, Town Bluff, Spurger, Village Mills and Hillister.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 3048 9424 3045 9431 3048 9441 3053 9443
      3084 9436 3077 9407
TIME...MOT...LOC 1928Z 195DEG 18KT 3060 9429

TWH
Local storm report, Aug 7, 2:40 PM CDT, 2 hours 37 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
240 PM CDT TUE AUG 7 2018

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

1130 AM     TORNADO          3 SE GROVES             29.92N 93.88W
08/07/2018                   JEFFERSON          TX   PUBLIC

            A LANDSPOUT BRIEFLY TOUCHED DOWN SOUTHEAST OF GROVES AS

            EVIDENCED BY A PUBLIC VIDEO. NO DAMAGE HAS BEEN REPORTED.

&&

SWARTHEN
Special weather statement, Aug 7, 4:18 PM CDT, 59 minutes before
Special Weather Statement
National Weather Service Lake Charles LA
418 PM CDT TUE AUG 7 2018

LAZ044-052-053-072145-
Iberia LA-Lafayette LA-Vermilion LA-
418 PM CDT TUE AUG 7 2018

...SPECIAL WEATHER STATEMENT...

At 418 PM CDT, Doppler radar was tracking a strong thunderstorm near
Abbeville, moving north at 10 mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Lafayette, Abbeville, Broussard, Youngsville, Erath, Delcambre,
Maurice, Meaux, Jefferson Island, Ridge and Milton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2994 9220 3019 9219 3015 9191 3012 9194
      3010 9194 3008 9195 3007 9195 3007 9193
      2992 9198
TIME...MOT...LOC 2118Z 187DEG 8KT 2999 9208

Tingler
Special weather statement, Aug 7, 4:48 PM CDT, 29 minutes before
Special Weather Statement
National Weather Service Lake Charles LA
448 PM CDT TUE AUG 7 2018

LAZ044-045-052-072215-
Lafayette LA-Vermilion LA-Upper St. Martin LA-
448 PM CDT TUE AUG 7 2018

...SPECIAL WEATHER STATEMENT...

At 448 PM CDT, Doppler radar was tracking a strong thunderstorm near
Maurice, or near Lafayette, moving north at 10 mph.

Winds in excess of 30 mph will be possible with this storm.

Locations impacted include...
Lafayette, Scott, Breaux Bridge, Carencro, Broussard, Youngsville,
Maurice, Ridge and Milton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3007 9192 3007 9195 3003 9197 3006 9218
      3027 9218 3027 9216 3028 9216 3029 9214
      3031 9213 3034 9209 3030 9184
TIME...MOT...LOC 2148Z 196DEG 10KT 3015 9207

Warthen
Special weather statement, Aug 7, 4:50 PM CDT, 27 minutes before
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Special weather statement, Aug 7, 5:17 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 12:05 PM CDTSpecial Weather StatementLCHSaint Landry40 min
Aug 7, 12:52 PM CDTSpecial Weather StatementLCHCalcasieu38 min
Aug 7, 1:03 PM CDTSpecial Weather StatementLCHRapides42 min
Aug 7, 1:22 PM CDTSevere Thunderstorm WarningLCHAllen, Beauregard26 min
Aug 7, 4:18 PM CDTSpecial Weather StatementLCHLafayette27 min
Aug 7, 4:48 PM CDTSpecial Weather StatementLCHLafayette27 min
Aug 7, 4:50 PM CDTSpecial Weather StatementLCHAssumption25 min
Aug 7, 2:28 PM CDTSpecial Weather StatementLCHTyler47 min

Nearby

Special Weather Statements in Louisiana, 2018Every special weather statement in 2018

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.