Alert archive / Louisiana / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 313, NWS Shreveport, LA

May 27, 2025Grant Parish, LaSalle Parish, Natchitoches Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 27, 2025, 4:35 AM CDT for Grant Parish, LaSalle Parish, Natchitoches Parish, Louisiana. It was in force for 55 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 27, 2025, 4:35 AM CDT (09:35 UTC)
Expired: May 27, 2025, 5:30 AM CDT
In force: 55 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Grant Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA

The radar

The Ft Polk radar (KPOE), 67 km from the middle of the area, began a volume at 09:35 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 nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 9.6 hours before the alert went out and 181 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: 181 J/kg
Mixed-layer CIN: -279 J/kg
Mixed-layer LCL: 1768 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 26, 6:45 PM CDT, 9 hours 50 minutes earlier.

Area forecast discussion, May 26, 6:45 PM CDT, 9 hours 50 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 11:55 PM CDT	Special Weather Statement	SHV	Angelina, Nacogdoches	65 min
May 27, 12:05 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine	40 min
May 27, 12:45 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine	45 min
May 27, 1:27 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine	48 min
May 27, 1:59 AM CDT	Special Weather Statement	SHV	Sabine	61 min
May 27, 2:41 AM CDT	Special Weather Statement	SHV	Sabine	64 min
May 27, 8:24 AM CDT	River Flood Warning	SHV	Gregg, Harrison	6 hr
May 27, 8:28 AM CDT	River Flood Warning	SHV	Anderson, Angelina, Cherokee, Houston	12 hr
May 27, 8:29 AM CDT	River Flood Warning	SHV	Angelina, Polk, Trinity	40 days
May 27, 8:39 AM CDT	River Flood Warning	SHV	Angelina, Nacogdoches	51 days
May 27, 12:50 AM CDT	Special Weather Statement	SHV	De Soto	25 min
May 27, 1:33 AM CDT	Special Weather Statement	SHV	De Soto	27 min
May 27, 10:53 AM CDT	River Flood Warning	SHV	Morehouse, Union	14 days

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.