Alert archive / Louisiana / Flash Flood Warnings in 2022

Flash Flood Warning 23, NWS New Orleans, LA

May 13, 20224 parishes in Louisiana

NWS New Orleans, LA issued this flash flood warning at May 13, 2022, 3:44 PM CDT for 4 parishes in Louisiana. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 13, 2022, 3:44 PM CDT (20:44 UTC)
Expired
May 13, 2022, 6:18 PM CDT
In force
3 hr
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

Counties Ascension Parish, LA, Assumption Parish, LA, Iberville Parish, LA, Saint James Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.7 hours before the alert went out and 129 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 2022-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 321 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 2022-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
321 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
953 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning 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 flash flood warning went out at May 13, 1:05 PM CDT, 2 hours 39 minutes earlier.

Area forecast discussion, May 13, 1:05 PM CDT, 2 hours 39 minutes before
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In the hours before

Special weather statement, May 13, 2:50 PM CDT, 54 minutes before
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Special weather statement, May 13, 3:05 PM CDT, 39 minutes before
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<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Special weather statement, May 13, 3:09 PM CDT, 35 minutes before
Special Weather Statement
National Weather Service New Orleans LA
309 PM CDT Fri May 13 2022

LAZ056-057-085-086-132045-
Western Ascension LA-Assumption LA-St. James LA-Eastern Ascension LA-
309 PM CDT Fri May 13 2022

...A strong thunderstorm will impact portions of southwestern
Ascension, western St. James and northeastern Assumption Parishes
through 345 PM CDT...

At 308 PM CDT, Doppler radar was tracking a strong thunderstorm over
Donaldsonville, moving south at 10 mph.

HAZARD...Wind gusts up to 50 mph, half-inch hail, and torrential
         downpours.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible. Torrential rainfall is also occurring with this
         storm and may lead to localized flooding.

Locations impacted include...
Gonzales, Donaldsonville, Napoleonville, Sorrento, Paincourtville and
Belle Rose.

This includes Interstate 10 in Louisiana between mile markers 180 and
183.

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.

Do not drive your vehicle through flooded roadways.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3020 9103 3020 9087 2991 9082 2991 9111
TIME...MOT...LOC 2008Z 358DEG 7KT 3008 9097

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

JRK
Special weather statement, May 13, 3:17 PM CDT, 27 minutes before
Special Weather Statement
National Weather Service New Orleans LA
317 PM CDT Fri May 13 2022

LAZ046-048-083-085-132045-
Iberville LA-Northern Livingston LA-Western Ascension LA-
East Baton Rouge LA-
317 PM CDT Fri May 13 2022

...Strong thunderstorms will impact portions of northwestern
Ascension, northwestern Livingston, east central Iberville and East
Baton Rouge Parishes through 345 PM CDT...

At 315 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Jackson to near Geismar to Watson.
Movement was south at 20 mph.

HAZARD...Winds in excess of 40 mph, pea size hail, and torrential
         rain.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible. Torrential rainfall is also occurring with this
         storm and may lead to localized flooding.

Locations impacted include...
Baton Rouge, Zachary, Baker, Denham Springs, Gonzales, Oak Hills
Place, St. Gabriel, Walker, Sorrento, Westminster, Old Jefferson,
Merrydale, Geismar, Inniswold, Watson, Prairieville, Pride, Village
St. George, Shenandoah and Gardere.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 156 and 183.
 Interstate 12 between mile markers 1 and 15.
 Interstate 110 in Louisiana between mile markers 1 and 8.

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.

Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3070 9125 3072 9099 3071 9088 3068 9088
      3065 9091 3065 9088 3017 9087 3016 9088
      3021 9112 3052 9120 3065 9128
TIME...MOT...LOC 2015Z 348DEG 19KT 3078 9120 3023 9099 3056 9095

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

JRK
Special weather statement, May 13, 3:28 PM CDT, 16 minutes before
Special Weather Statement
National Weather Service New Orleans LA
328 PM CDT Fri May 13 2022

LAZ046>048-132100-
Iberville LA-West Baton Rouge LA-East Baton Rouge LA-
328 PM CDT Fri May 13 2022

...A strong thunderstorm will impact portions of West Baton Rouge,
central Iberville and southwestern East Baton Rouge Parishes through
400 PM CDT...

At 327 PM CDT, Doppler radar was tracking a strong thunderstorm near
Grosse Tete, or 8 miles west of Port Allen, moving south at 15 mph.

HAZARD...Winds in excess of 40 mph, pea size hail, and torrential
         rain.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible. Torrential rainfall is also occurring with this
         storm and may lead to localized flooding.

Locations impacted include...
Baton Rouge, Plaquemine, Port Allen, Addis, Brusly, Rosedale, Grosse
Tete, Ramah, Erwinville and Gardere.

This includes Interstate 10 in Louisiana between mile markers 134 and
155.

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.

Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3045 9152 3051 9149 3051 9142 3054 9141
      3056 9136 3056 9127 3052 9123 3037 9115
      3020 9119 3017 9138 3029 9153 3036 9155
TIME...MOT...LOC 2027Z 007DEG 13KT 3045 9135

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

JRK
Special weather statement, May 13, 3:40 PM CDT, 4 minutes before
Special Weather Statement
National Weather Service New Orleans LA
340 PM CDT Fri May 13 2022

LAZ076-079-080-132100-
Southeast St. Tammany LA-Northern St. Tammany LA-
Southwestern St. Tammany LA-
340 PM CDT Fri May 13 2022

...A strong thunderstorm will impact portions of central St. Tammany
Parish through 400 PM CDT...

At 340 PM CDT, Doppler radar was tracking a strong thunderstorm 8
miles north of Lacombe, or 11 miles northwest of Slidell, moving
south at 15 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Slidell, Lacombe and Slidell Airport.

This includes Interstate 12 between mile markers 66 and 80.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

Frequent 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 3053 8995 3048 8977 3025 8984 3037 9008
TIME...MOT...LOC 2040Z 011DEG 14KT 3043 8989

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

JRK

The office that day

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

IssuedProductOfficeCountiesLasted
May 12, 8:15 PM CDTSpecial Weather StatementLIXSaint Helena45 min
May 12, 9:00 PM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana, Livingston, Saint Helena37 min
May 12, 9:30 PM CDTSpecial Weather StatementLIXEast Baton Rouge60 min
May 12, 11:02 PM CDTSpecial Marine WarningLIX43 min
May 13, 12:19 AM CDTSpecial Weather StatementLIXJefferson, Lafourche, Saint Charles56 min
May 13, 1:58 AM CDTSpecial Marine WarningLIX62 min
May 13, 3:01 AM CDTSpecial Marine WarningLIX59 min
May 13, 3:56 AM CDTSpecial Marine WarningLIX64 min
May 13, 6:09 AM CDTSpecial Marine WarningLIX66 min
May 13, 7:07 AM CDTSpecial Marine WarningLIX83 min
May 13, 1:13 PM CDTSpecial Weather StatementLIXSaint Helena32 min
May 13, 1:21 PM CDTSpecial Marine WarningLIX54 min
May 13, 1:44 PM CDTSevere Thunderstorm WarningLIXEast Feliciana, Saint Helena46 min
May 13, 2:26 PM CDTSpecial Weather StatementLIXEast Baton Rouge, East Feliciana, Saint Helena49 min
May 13, 3:09 PM CDTSpecial Weather StatementLIXSaint James36 min
May 13, 3:17 PM CDTSpecial Weather StatementLIXAscension, East Baton Rouge28 min
May 13, 3:28 PM CDTSpecial Weather StatementLIXIberville, West Baton Rouge32 min
May 13, 3:40 PM CDTSpecial Weather StatementLIXSaint Tammany20 min
May 13, 3:45 PM CDTSpecial Weather StatementLIXSaint James15 min
May 13, 3:47 PM CDTFlash Flood WarningLIXAscension, East Baton Rouge, Livingston, West Baton Rouge3 hr
May 13, 3:49 PM CDTSevere Thunderstorm WarningLIXAscension, East Baton Rouge, Iberville, Livingston, Saint James, Saint John the Baptist and 1 more41 min
May 13, 3:56 PM CDTSpecial Marine WarningLIX64 min
May 13, 4:03 PM CDTSevere Thunderstorm WarningLIXSaint Tammany31 min
May 13, 4:06 PM CDTSpecial Marine WarningLIX66 min
May 13, 4:14 PM CDTFlash Flood WarningLIXIberville, Pointe Coupee, West Baton Rouge2 hr
May 13, 4:18 PM CDTAreal Flood AdvisoryLIXSaint Tammany, Washington2 hr
May 13, 4:20 PM CDTSevere Thunderstorm WarningLIXAscension, Assumption, Iberville, Lafourche, Saint Charles, Saint James and 2 more40 min
May 13, 5:01 PM CDTSpecial Weather StatementLIXAssumption29 min
May 13, 5:10 PM CDTSevere Thunderstorm WarningLIXJefferson, Plaquemines50 min
May 13, 5:29 PM CDTSpecial Weather StatementLIXJefferson, Lafourche31 min
May 13, 6:01 PM CDTSpecial Marine WarningLIX119 min
May 13, 6:25 PM CDTSpecial Weather StatementLIXJefferson35 min
May 12, 7:56 PM CDTSpecial Weather StatementLIXAmite49 min
May 12, 9:55 PM CDTSpecial Weather StatementLIXAmite65 min
May 13, 2:38 PM CDTSpecial Weather StatementLIXWalthall22 min
May 13, 2:50 PM CDTSpecial Weather StatementLIXPearl River25 min
May 13, 3:05 PM CDTSpecial Weather StatementLIXWalthall25 min
May 13, 6:59 PM CDTSpecial Weather StatementLIXGeorge31 min

Nearby

Flash Flood Warnings in Louisiana, 2022Every flash flood warning in 2022

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.