Alert archive / Tennessee / Mesoscale Discussions in 2025

Mesoscale Discussion 2155

October 18, 2025Benton County, Marshall County, Mississippi; 5 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at Oct 18, 2025, 8:52 PM CDT for Benton County, Marshall County, Mississippi; 5 counties in Tennessee. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Oct 18, 2025, 8:52 PM CDT (01:52 UTC)
Expired: Oct 18, 2025, 9:45 PM CDT
In force: 53 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 626

Counties Benton County, MS, Marshall County, MS, Chester County, TN, Fayette County, TN, Hardeman County, TN, Haywood County, TN, Madison County, TN

The radar

The Memphis radar (KNQA), 72 km from the middle of the area, began a volume at 01:56 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

Birmingham, AL (KBMX), launched 00:00Z, 1.9 hours before the alert went out and 313 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: 1822 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 18, 7:51 PM CDT	Tornado Watch	SPC	Adams, Attala, Bolivar, Carroll, Choctaw, Claiborne and 29 more	7 hr
Oct 18, 8:59 PM CDT	Mesoscale Discussion	SPC	Carroll, Grenada, Hinds, Holmes, Humphreys, Issaquena and 6 more	2 hr
Oct 18, 11:27 PM CDT	Mesoscale Discussion	SPC	Claiborne, Hinds, Issaquena, Leake, Madison, Rankin and 4 more	2 hr

Nearby

Mesoscale Discussions in Tennessee, 2025 Mesoscale Discussions in Mississippi, 2025 Every mesoscale discussion 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.