Alert archive / Louisiana / Special Weather Statements in 2020

Special Weather Statement, NWS New Orleans, LA

April 29, 202010 parishes in Louisiana; Pike County, Walthall County, Mississippi

NWS New Orleans, LA issued this special weather statement at Apr 29, 2020, 5:07 AM CDT for 10 parishes in Louisiana; Pike County, Walthall County, Mississippi. It was in force for 38 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
Apr 29, 2020, 5:07 AM CDT (10:07 UTC)
Expired
Apr 29, 2020, 5:45 AM CDT
In force
38 min
Issued by
NWS New Orleans, LA

Counties Ascension Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Livingston Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, Pike County, MS, Walthall County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 10.1 hours before the alert went out and 100 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 00:00Z on 2020-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 426 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 00:00Z on 2020-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 square meters per square second.193958Sfc1 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
426 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
987 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.8

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 Apr 29, 3:47 AM CDT, 1 hour 20 minutes earlier.

Area forecast discussion, Apr 29, 3:47 AM CDT, 1 hour 20 minutes before
Area Forecast Discussion
National Weather Service New Orleans LA
347 AM CDT Wed Apr 29 2020

.SHORT TERM...
Will maintain high rain chances with showers and scattered
embedded storms along the front this morning. A few strong to
severe storms in this squall line are expected with hail and
strong to damaging wind gusts being the main factor but can not
rule out an isolated tornado. Showers and storms will linger
through much of the day as rainfall amounts of 1 to 2 inches can
be expected. Dry conditions are expected Thursday through the
weekend with warm conditions returning into the weekend and the
first of next week.

.LONG TERM...
Once all the unsettled weather passes through our area, rain stays
out of the forecast as high pressure will build in for the rest of
the weekend as a upper level ridge holds over most of the southern
CONUS. Return flow starting on Saturday will also steadily bring up
the dew points nearing 70s by Monday. Additionally, temperatures
will increase through the weekend with 90 degree days possible,
especially on Sunday and Monday.

&&

.AVIATION...
Cigs and TS activity will keep all terminals in IFR or LIFR
conditions through the morning hours. This will ease as the day
wears on and should be VFR by afternoon. This process will move
from north to south. Once VFR conditions move into each terminal,
it should stay that way through this taf cycle.

&&

.MARINE...
Winds will increase on this afternoon and tonight especially
behind the front as a moderate offshore flow once again returns to
the coastal waters. Offshore flow will continue on Thursday and
gradually lull by Thursday night remaining light but shifting
around to a southerly direction over the weekend.

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  77  55  76  54 /  60   0   0   0
BTR  77  53  76  54 /  60   0   0   0
ASD  79  55  78  55 / 100   0   0   0
MSY  79  61  77  60 / 100   0   0   0
GPT  77  57  76  57 / 100  10   0   0
PQL  78  55  79  53 / 100  10   0   0

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...None.
GM...None.
MS...None.
GM...None.
&&

In the hours before

Special weather statement, Apr 29, 3:32 AM CDT, 1 hour 35 minutes before
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Special weather statement, Apr 29, 3:57 AM CDT, 1 hour 10 minutes before
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Special weather statement, Apr 29, 4:28 AM CDT, 39 minutes before
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Special weather statement, Apr 29, 4:59 AM CDT, 8 minutes before
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Special weather statement, Apr 29, 5:07 AM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 28, 7:24 PM CDTSpecial Marine WarningLIX66 min
Apr 28, 8:05 PM CDTSpecial Weather StatementLIXOrleans40 min
Apr 28, 8:19 PM CDTSpecial Weather StatementLIXLafourche41 min
Apr 28, 8:30 PM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche32 min
Apr 28, 8:36 PM CDTSpecial Marine WarningLIX54 min
Apr 28, 8:51 PM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche, Plaquemines, Saint Bernard54 min
Apr 28, 9:12 PM CDTSpecial Weather StatementLIXOrleans33 min
Apr 28, 9:23 PM CDTSpecial Marine WarningLIX52 min
Apr 28, 9:35 PM CDTSevere Thunderstorm WarningLIXOrleans, Saint Bernard, Saint Tammany55 min
Apr 28, 9:47 PM CDTSpecial Marine WarningLIX28 min
Apr 28, 9:59 PM CDTSpecial Marine WarningLIX91 min
Apr 28, 10:47 PM CDTSpecial Marine WarningLIX28 min
Apr 28, 10:59 PM CDTWind AdvisoryLIXSaint Bernard3 hr
Apr 28, 11:11 PM CDTSmall Craft AdvisoryLIX3 hr
Apr 29, 12:39 AM CDTSpecial Marine WarningLIX66 min
Apr 29, 3:32 AM CDTSpecial Marine WarningLIX58 min
Apr 29, 3:38 AM CDTSpecial Marine WarningLIX67 min
Apr 29, 3:57 AM CDTSpecial Weather StatementLIXPointe Coupee, West Feliciana63 min
Apr 29, 4:17 AM CDTSpecial Marine WarningLIX28 min
Apr 29, 4:28 AM CDTSpecial Weather StatementLIXEast Baton Rouge, East Feliciana, Pointe Coupee, Saint Helena, West Baton Rouge, West Feliciana62 min
Apr 29, 5:29 AM CDTSpecial Marine WarningLIX91 min
Apr 29, 5:42 AM CDTSpecial Weather StatementLIXAscension, Assumption, Livingston, Saint James, Saint John the Baptist, Saint Tammany and 2 more48 min
Apr 29, 5:43 AM CDTSpecial Marine WarningLIX32 min
Apr 29, 6:11 AM CDTSpecial Marine WarningLIX2 hr
Apr 29, 6:27 AM CDTSpecial Marine WarningLIX63 min
Apr 29, 6:28 AM CDTSpecial Weather StatementLIXAssumption, Lafourche, Orleans, Saint Charles, Saint James, Saint John the Baptist and 2 more47 min
Apr 29, 6:59 AM CDTSpecial Marine WarningLIX61 min
Apr 29, 7:09 AM CDTSevere Thunderstorm WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard36 min
Apr 29, 7:22 AM CDTSpecial Marine WarningLIX23 min
Apr 29, 7:22 AM CDTSpecial Weather StatementLIXJefferson, Lafourche23 min
Apr 29, 7:52 AM CDTSpecial Weather StatementLIXJefferson, Plaquemines38 min
Apr 29, 8:01 AM CDTSpecial Marine WarningLIX119 min
Apr 29, 8:23 AM CDTSpecial Marine WarningLIX67 min
Apr 29, 9:59 AM CDTSpecial Marine WarningLIX91 min
Apr 29, 11:30 AM CDTSpecial Marine WarningLIX90 min
Apr 29, 12:29 PM CDTSpecial Marine WarningLIX61 min
Apr 29, 3:32 AM CDTSpecial Weather StatementLIXWilkinson58 min
Apr 29, 4:59 AM CDTSpecial Weather StatementLIXStone31 min
Apr 29, 5:45 AM CDTSpecial Weather StatementLIXJackson30 min
Apr 29, 6:07 AM CDTSpecial Weather StatementLIXHarrison, Jackson23 min
Apr 29, 6:32 AM CDTSpecial Weather StatementLIXJackson28 min
Apr 29, 7:26 AM CDTSpecial Weather StatementLIXHancock, Harrison, Jackson49 min

Nearby

Special Weather Statements in Louisiana, 2020Special Weather Statements in Mississippi, 2020Every special weather statement in 2020

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.