Alert archive / Louisiana / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 259, NWS Shreveport, LA

May 17, 2025Union Parish, Louisiana; Union County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at May 17, 2025, 3:44 PM CDT for Union Parish, Louisiana; Union County, Arkansas. It was in force for 46 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 17, 2025, 3:44 PM CDT (20:44 UTC)
Expired: May 17, 2025, 4:30 PM CDT
In force: 46 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Union County, AR, Union Parish, LA

The radar

The Shreveport radar (KSHV), 141 km from the middle of the area, began a volume at 20:47 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

Jackson, MS (KJAN), launched 12:00Z, 8.7 hours before the alert went out and 238 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: 1263 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 783 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 7.1

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 17, 12:53 PM CDT, 2 hours 51 minutes earlier.

Area forecast discussion, May 17, 12:53 PM CDT, 2 hours 51 minutes before

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In the hours before

Special weather statement, May 17, 3:33 PM CDT, 11 minutes before

Special Weather Statement
National Weather Service Shreveport LA
333 PM CDT Sat May 17 2025

ARZ073-LAZ006-172115-
Union AR-Union LA-
333 PM CDT Sat May 17 2025

...A STRONG THUNDERSTORM WILL IMPACT SOUTH CENTRAL UNION COUNTY IN
SOUTH CENTRAL ARKANSAS AND NORTHERN UNION PARISHES THROUGH 415 PM
CDT...

At 332 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles east of Cooley, or 16 miles southeast of Junction City, moving
northeast at 15 mph.

HAZARD...Pea size hail.

SOURCE...Radar indicated.

IMPACT...Minor hail damage to vegetation is possible.

Locations impacted include...
Bernice, Farmerville, Oakland, Taylorville, Lillie, Bayou D Arbonne
Lake, Spearsville, Lockhart, Cooley, Marion, Cecil, Shiloh, and
Litroe.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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 3270 9243 3281 9274 3282 9273 3286 9273
      3308 9260 3297 9210
TIME...MOT...LOC 2032Z 226DEG 12KT 3288 9250

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...<30 MPH

53

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 3:33 PM CDT	Special Weather Statement	SHV	Union	42 min
May 17, 2:38 AM CDT	Special Weather Statement	SHV	Hempstead	52 min
May 17, 3:33 AM CDT	Special Weather Statement	SHV	Columbia	27 min
May 17, 4:25 PM CDT	Severe Thunderstorm Warning Considerable damage threat	SHV	Union	35 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2025 Severe Thunderstorm Warnings in Arkansas, 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.