Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS New Orleans, LA

June 27, 2021Washington Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Jun 27, 2021, 10:26 AM CDT for Washington Parish, Louisiana. It was in force for 34 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: Jun 27, 2021, 10:26 AM CDT (15:26 UTC)
Expired: Jun 27, 2021, 11:00 AM CDT
In force: 34 min
Issued by: NWS New Orleans, LA

County Washington Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.4 hours before the alert went out and 87 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: 2123 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 654 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 8.9

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 New Orleans, LA wrote its last area forecast discussion before this special weather statement went out at Jun 27, 10:22 AM CDT, 4 minutes earlier.

Area forecast discussion, Jun 27, 10:22 AM CDT, 4 minutes before

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<body>
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    <section class="card" role="status" aria-live="polite">
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      <h1 id="headline">This service is currently unavailable.</h1>
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In the hours before

Special weather statement, Jun 27, 10:26 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service New Orleans LA
1026 AM CDT Sun Jun 27 2021

LAZ039-MSZ071-077-271600-
Washington-Walthall-Pearl River-
1026 AM CDT Sun Jun 27 2021

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN WASHINGTON
PARISH...SOUTHWESTERN WALTHALL AND NORTHWESTERN PEARL RIVER
COUNTIES...

At 1024 AM CDT, radar indicated strong thunderstorms were located
along a line extending from 8 miles north of Franklinton to near
Crossroads. Movement was northwest at 15 mph.

Heavy rain and wind gusts of 20 to 30 mph are possible with these
storms.

Locations impacted include...
Bogalusa, Franklinton, Tylertown, Varnado, Crossroads and Angie.

Torrential rainfall is occurring with these storms. Expect rainfall
accumulation of 1 to 2 inches in about an hour. This may cause
localized street flooding and ponding of water in low lying areas.
Do not drive your vehicle through flooded roadways.

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

LAT...LON 3120 9025 3093 8971 3069 8969 3090 9024
TIME...MOT...LOC 1524Z 152DEG 11KT 3097 9012 3075 8971

95/DM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 10:30 AM CDT	Special Weather Statement	LIX	Lafourche	60 min
Jun 27, 12:15 PM CDT	Special Weather Statement	LIX	Saint Charles	30 min
Jun 27, 1:09 PM CDT	Special Weather Statement	LIX	East Baton Rouge, Livingston, West Baton Rouge	36 min
Jun 27, 1:35 PM CDT	Special Weather Statement	LIX	Tangipahoa	40 min
Jun 27, 3:05 PM CDT	Special Weather Statement	LIX	Saint Helena, Tangipahoa	25 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.