Alert archive / Louisiana / Flash Flood Warnings in 2023

Flash Flood Warning 15, NWS New Orleans, LA

March 27, 2023East Baton Rouge Parish, Iberville Parish, West Baton Rouge Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Mar 27, 2023, 8:02 PM CDT for East Baton Rouge Parish, Iberville Parish, West Baton Rouge Parish, 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: Mar 27, 2023, 8:02 PM CDT (01:02 UTC)
Expired: Mar 27, 2023, 11:15 PM CDT
In force: 3 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

Counties East Baton Rouge Parish, LA, Iberville Parish, LA, West Baton Rouge Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 1.0 hours before the alert went out and 150 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: 1871 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 809 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.1

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 Mar 27, 7:12 PM CDT, 50 minutes earlier.

Area forecast discussion, Mar 27, 7:12 PM CDT, 50 minutes before

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In the hours before

Special weather statement, Mar 27, 6:55 PM CDT, 1 hour 7 minutes before

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Special weather statement, Mar 27, 7:35 PM CDT, 27 minutes before

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Special weather statement, Mar 27, 7:59 PM CDT, 3 minutes before

Special Weather Statement
National Weather Service New Orleans LA
759 PM CDT Mon Mar 27 2023

LAZ047-048-280130-
West Baton Rouge LA-East Baton Rouge LA-
759 PM CDT Mon Mar 27 2023

...A strong thunderstorm will impact portions of West Baton Rouge and
southwestern East Baton Rouge Parishes through 830 PM CDT...

At 759 PM CDT, Doppler radar was tracking a strong thunderstorm over
Brusly, or near Port Allen, moving east at 15 mph.

HAZARD...Winds in excess of 30 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...
Baton Rouge, Baker, Port Allen, Oak Hills Place, Addis, Brusly,
Westminster, Old Jefferson, Merrydale, Inniswold, Village St. George,
Gardere, Brownfields, Shenandoah and Baton Rouge Airport.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 142 and 166.
 Interstate 12 between mile markers 1 and 6.
 Interstate 110 in Louisiana between mile markers 1 and 8.

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.

&&

LAT...LON 3062 9110 3036 9099 3032 9121 3033 9131
      3041 9140 3045 9143
TIME...MOT...LOC 0059Z 249DEG 12KT 3042 9127

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH

Zeringue

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 27, 7:35 PM CDT	Special Weather Statement	LIX	East Feliciana	25 min
Mar 27, 7:41 PM CDT	Areal Flood Advisory	LIX	Iberville, Pointe Coupee, West Baton Rouge	3 hr
Mar 27, 7:48 PM CDT	Marine Dense Fog Advisory	LIX		13 hr
Mar 27, 7:59 PM CDT	Special Weather Statement	LIX	East Baton Rouge, West Baton Rouge	31 min
Mar 27, 8:38 PM CDT	Special Weather Statement	LIX	East Baton Rouge	37 min
Mar 27, 9:00 PM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Saint Helena	45 min
Mar 27, 9:23 PM CDT	Special Weather Statement	LIX	Saint Helena	37 min
Mar 27, 10:26 PM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	34 min
Mar 27, 10:55 PM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	35 min
Mar 27, 11:24 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	36 min
Mar 27, 11:49 PM CDT	Severe Thunderstorm Warning	LIX	Washington	41 min
Mar 28, 12:59 AM CDT	Special Weather Statement	LIX	Washington	31 min
Mar 28, 1:10 AM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	29 min
Mar 28, 3:59 AM CDT	Special Marine Warning	LIX		61 min
Mar 28, 4:35 AM CDT	Special Weather Statement	LIX	West Baton Rouge	40 min
Mar 28, 4:52 AM CDT	Special Marine Warning	LIX		34 min
Mar 28, 5:28 AM CDT	Special Weather Statement	LIX	East Baton Rouge	47 min
Mar 28, 5:42 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, East Feliciana, Pointe Coupee, Saint Helena, West Feliciana	48 min
Mar 28, 5:49 AM CDT	Special Weather Statement	LIX	Saint Helena	26 min
Mar 28, 6:08 AM CDT	Severe Thunderstorm Warning	LIX	Washington	37 min
Mar 28, 6:15 AM CDT	Special Weather Statement	LIX	Saint John the Baptist	45 min
Mar 28, 6:28 AM CDT	Severe Thunderstorm Warning	LIX	East Feliciana, Saint Helena	15 min
Mar 28, 6:54 AM CDT	Special Marine Warning	LIX		66 min
Mar 28, 3:09 PM CDT	Small Craft Advisory	LIX		19 hr
Mar 27, 9:59 PM CDT	Special Weather Statement	LIX	Pike	31 min
Mar 27, 10:22 PM CDT	Special Weather Statement	LIX	Pearl River	23 min
Mar 27, 10:59 PM CDT	Special Weather Statement	LIX	Pearl River	31 min
Mar 28, 12:25 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Hancock, Harrison, Pearl River	22 min
Mar 28, 1:31 AM CDT	Special Weather Statement	LIX	Jackson	44 min
Mar 28, 2:20 AM CDT	Special Weather Statement	LIX	Jackson	25 min
Mar 28, 6:02 AM CDT	Special Weather Statement	LIX	Walthall	28 min
Mar 28, 6:33 AM CDT	Severe Thunderstorm Warning	LIX	Pike, Walthall	42 min
Mar 28, 7:08 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Walthall	37 min
Mar 28, 7:20 AM CDT	Severe Thunderstorm Warning	LIX	Amite, Pike	25 min
Mar 28, 7:29 AM CDT	Special Weather Statement	LIX	Hancock	46 min
Mar 28, 8:14 AM CDT	Special Weather Statement	LIX	Hancock	31 min
Mar 28, 8:46 AM CDT	Areal Flood Advisory	LIX	Harrison, Jackson	3 hr
Mar 28, 8:50 AM CDT	Special Weather Statement	LIX	Jackson	40 min
Mar 28, 9:52 AM CDT	Special Weather Statement	LIX	Jackson	68 min

Nearby

Flash Flood Warnings in Louisiana, 2023 Every flash flood warning in 2023

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.