Alert archive / Louisiana / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 83, NWS New Orleans, LA

May 6, 2025Livingston Parish, Saint Helena Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at May 6, 2025, 5:31 PM CDT for Livingston Parish, Saint Helena Parish, Tangipahoa Parish, Louisiana. It was in force for 44 min. 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 6, 2025, 5:31 PM CDT (22:31 UTC)
Expired: May 6, 2025, 6:15 PM CDT
In force: 44 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Livingston Parish, LA, Saint Helena Parish, LA, Tangipahoa Parish, LA

The radar

The Hammond radar (KHDC), 23 km from the middle of the area, began a volume at 22:34 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 6, 5:19 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 10.5 hours before the alert went out and 195 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1730 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 171 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 severe thunderstorm 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 severe thunderstorm warning went out at May 6, 4:26 PM CDT, 1 hour 5 minutes earlier.

Area forecast discussion, May 6, 4:26 PM CDT, 1 hour 5 minutes before

Area Forecast Discussion
National Weather Service New Orleans LA
426 PM CDT Tue May 6 2025

...New SHORT TERM, LONG TERM, AVIATION, MARINE...

.SHORT TERM...
(This evening through Wednesday night)
Issued at 425 PM CDT Tue May 6 2025

Rainy period is just getting started for the local area as scattered
strong to severe storms (multiple large hail reports over the last
couple hours) track across the CWA. The current severe storm and
developing areal showers are feeding off moisture rich warm sector
air south of a lifting warm front. Loss of daytime heating should
cause a lull in convective activity through the course of the
evening.

From a more regional perspective, a broken line of strong to severe
thunderstorms is tracking east from Texas into Louisiana. The
eastern side of an upper low pushes east into Missouri and Arkansas.
What that does is drive a surface trough to southern LA and MS. It's
west to east orientation will be perpendicular to southerly low
level flow. That, combined with 1.7 to 2 inch PW's will create a
setup conducive for heavy rainfall and flash flooding. So no
appreciable changes to previous forecasts which calls for a few to
several inches of rain across the local forecast area. Precise
location of highest rainfall amounts continues to be challenging but
generally along/south of I-10 in LA appears to be the most likely
area for this heavier rain from 06z to 18z Wed. The line of
showers/storms continues south to the LA coast for the remainder of
the day.

MEFFER
&&

.LONG TERM...
(Thursday through Monday night)
Issued at 425 PM CDT Tue May 6 2025

Models shows a couple more waves of heavier rainfall moving along
the Gulf Coast through portions of the CWA Thu-Fri as the upper low
to the north slowly moves eastward. Will there be any improvement
next weekend? Depends on your definition of improvement. While heavy
rain potential appears to be lower, rain chances don't fall off too
much with areal coverage pretty decent. The stubborn upper low just
doesn't have anything to kick it out, so it just drifts south
towards the CWA. The good news is we won't be setting any record
high temps anytime soon.

MEFFER
&&

.AVIATION...
(00Z TAFS)
Issued at 425 PM CDT Tue May 6 2025

Main impacts in the short term will be current showers and
thunderstorms mainly located between KBTR and KMSY. Hail has been
reported with that main storm but the probability of it occuring at
any terminal is extremely low. KHDC stands the best chance to see
heavy rain and lightning now through 00Z. Then, the remainder of the
night will be a mix of MVFR LIFR ceilings along with the potential
for widespread heavy rainfall. Visibilities could drop to less than
1SM at times. Expect little improvement in overall impacts to be
slow through Wednesday morning.

&&

.MARINE...
Issued at 425 PM CDT Tue May 6 2025

Easterly winds remain moderately strong, right at the cusp of Small
Craft Advisory criteria. Should begin seeing a gradual relaxing of
the winds overnight as warm front that lifted north today is pushed
back south the coast. Stalled front along the coastal waters the
remainder of the week should lend to winds/seas on the lighter side.
Will see wind directions shifting from onshore to offshore depending
on the position of the frontal boundary in relation to the marine
zones.

MEFFER
&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  66  81  64  80 /  80  80  60  80
BTR  68  81  66  80 /  80  70  70  90
ASD  68  81  65  80 /  80  80  70  90
MSY  73  81  69  81 /  70  80  80  90
GPT  70  79  67  79 /  70  80  70  90
PQL  68  82  65  81 /  70  70  60  90

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...Flood Watch through Thursday evening for LAZ034>037-039-046>048-
     056>060-064>071-076>090.

GM...Small Craft Advisory until 10 PM CDT this evening for GMZ550-570.

MS...Flood Watch through Thursday evening for MSZ068>071-077-083>088.

GM...Small Craft Advisory until 10 PM CDT this evening for GMZ570.

&&

SHORT TERM...ME
LONG TERM....ME
AVIATION...ME
MARINE...ME

In the hours before

Special weather statement, May 6, 1:28 PM CDT, 4 hours 3 minutes before

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Local storm report, May 6, 2:07 PM CDT, 3 hours 24 minutes before

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Local storm report, May 6, 3:07 PM CDT, 2 hours 24 minutes before

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Local storm report, May 6, 3:31 PM CDT, 2 hours before

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Special weather statement, May 6, 4:16 PM CDT, 1 hour 15 minutes before

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Local storm report, May 6, 4:37 PM CDT, 54 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 6, 12:53 AM CDT	Special Marine Warning	LIX		67 min
May 6, 1:51 AM CDT	Special Marine Warning	LIX		54 min
May 6, 2:40 AM CDT	Special Marine Warning	LIX		65 min
May 6, 3:44 AM CDT	Small Craft Advisory	LIX		27 hr
May 6, 11:20 AM CDT	River Flood Warning	LIX	Washington	17 days
May 6, 11:20 AM CDT	River Flood Warning	LIX	Saint Tammany	19 days
May 6, 11:21 AM CDT	River Flood Warning	LIX	Saint Tammany	6 days
May 6, 11:23 AM CDT	River Flood Warning	LIX	Tangipahoa	6 days
May 6, 11:57 AM CDT	Special Weather Statement	LIX	West Baton Rouge	33 min
May 6, 11:59 AM CDT	Severe Thunderstorm Warning	LIX	Iberville	46 min
May 6, 12:04 PM CDT	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	26 min
May 6, 12:26 PM CDT	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	49 min
May 6, 12:57 PM CDT	Severe Thunderstorm Warning	LIX	Iberville	48 min
May 6, 1:28 PM CDT	Special Weather Statement	LIX	East Baton Rouge	32 min
May 6, 1:41 PM CDT	Severe Thunderstorm Warning	LIX	Iberville, West Baton Rouge	49 min
May 6, 2:30 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, West Baton Rouge	45 min
May 6, 3:11 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Livingston	49 min
May 6, 3:48 PM CDT	Severe Thunderstorm Warning	LIX	Livingston, Saint Helena, Tangipahoa	25 min
May 6, 5:35 PM CDT	Special Marine Warning	LIX		55 min
May 6, 5:41 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, Livingston, Saint John the Baptist, Tangipahoa	49 min
May 6, 5:47 PM CDT	Special Weather Statement	LIX	Saint Charles, Saint John the Baptist	43 min
May 6, 6:22 PM CDT	Special Weather Statement	LIX	Washington	23 min
May 6, 11:21 AM CDT	River Flood Warning	LIX	Pike, Walthall	71 hr
May 6, 11:22 AM CDT	River Flood Warning	LIX	Pearl River	64 hr
May 6, 11:22 AM CDT	River Flood Warning	LIX	Pearl River	64 hr
May 6, 4:16 PM CDT	Special Weather Statement	LIX	Amite, Wilkinson	44 min
May 6, 4:48 PM CDT	Severe Thunderstorm Warning	LIX	Amite, Wilkinson	42 min
May 6, 5:19 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LIX	Amite, Pike	41 min
May 6, 5:58 PM CDT	Severe Thunderstorm Warning	LIX	Amite, Pike	18 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2025 Every severe thunderstorm warning in 2025

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; radar from the NEXRAD Level II archive.