Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Lake Charles, LA

July 31, 2021St. Mary Parish, Louisiana

NWS Lake Charles, LA issued this special weather statement at Jul 31, 2021, 3:24 PM CDT for St. Mary Parish, Louisiana. It was in force for 36 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: Jul 31, 2021, 3:24 PM CDT (20:24 UTC)
Expired: Jul 31, 2021, 4:00 PM CDT
In force: 36 min
Issued by: NWS Lake Charles, LA

County St. Mary Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 8.4 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: 2274 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 811 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: -15 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 Jul 31, 12:44 PM CDT, 2 hours 40 minutes earlier.

Area forecast discussion, Jul 31, 12:44 PM CDT, 2 hours 40 minutes before

Area Forecast Discussion
National Weather Service Lake Charles LA
1244 PM CDT Sat Jul 31 2021

.DISCUSSION...
18Z 31JULY2021 TAFs

&&

.AVIATION...
We can expect VFR conditions through the end of this forecast
period with exception to some patchy fog tomorrow morning possibly
at KAEX. Strayed away from mentioning VCTS this afternoon due to
low PoPs and widely isolated activity in the models.
87 and 11

&&

.PRELIMINARY POINT TEMPS/POPS...
AEX  76  97  75  90 /  10  40  50  80
LCH  78  94  78  92 /  10  40  40  70
LFT  77  95  77  92 /  10  50  40  80
BPT  77  94  77  93 /  10  30  30  60

&&

.LCH WATCHES/WARNINGS/ADVISORIES...
LA...Heat Advisory until 7 PM CDT this evening for LAZ027>033-041>045-
     052>055-073-074.

TX...Heat Advisory until 7 PM CDT this evening for TXZ180-201-215-216-
     259>262.

GM...None.
&&

Hazardous weather outlook, Jul 31, 5:26 AM CDT, 9 hours 58 minutes before

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In the hours before

Special weather statement, Jul 31, 3:24 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Lake Charles LA
324 PM CDT Sat Jul 31 2021

LAZ054-055-312100-
Lower St. Martin LA-St. Mary LA-
324 PM CDT Sat Jul 31 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL ST. MARY AND
SOUTHEASTERN ST. MARTIN PARISHES UNTIL 400 PM CDT...

At 324 PM CDT, Doppler radar was tracking a strong thunderstorm near
Patterson Memorial Airport, or near Patterson, moving west at 10 mph.

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

Locations impacted include...
Franklin, Patterson, Baldwin, Patterson Memorial Airport, Charenton
and Centerville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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 2964 9131 2972 9158 2974 9162 2975 9160
      2976 9162 2976 9164 2975 9163 2975 9162
      2974 9163 2974 9164 2975 9166 2976 9169
      2976 9170 2994 9153 2981 9125
TIME...MOT...LOC 2024Z 105DEG 9KT 2975 9137

Rua

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 3:53 PM CDT	Heat Advisory	LCH	Allen, Avoyelles, Beauregard, Cameron, Evangeline, Lafayette and 4 more	27 hr
Jul 31, 4:33 PM CDT	Special Weather Statement	LCH	Saint Martin	42 min
Jul 31, 6:16 PM CDT	Special Weather Statement	LCH	Lafayette	44 min

Nearby

Special Weather Statements in Louisiana, 2021 Every 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.