Alert archive / Mississippi / Mesoscale Discussions in 2022

Mesoscale Discussion 55

January 9, 202213 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jan 9, 2022, 9:41 AM CST for 13 counties in Mississippi. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jan 9, 2022, 9:41 AM CST (15:41 UTC)
Expired: Jan 9, 2022, 12:15 PM CST
In force: 3 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 40%

Counties Claiborne County, MS, Copiah County, MS, Hinds County, MS, Lauderdale County, MS, Leake County, MS, Madison County, MS, Neshoba County, MS, Newton County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Warren County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 11 km from the middle of the area, began a volume at 15:40 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 14Jan 9, 10:45 AM CST

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 3.7 hours before the alert went out and 8 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: 423 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 516 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 316 m²/s²
0-3 km storm-relative helicity: 452 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.2

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
Jan 9, 10:42 AM CST	Tornado Watch	SPC	Clarke, Covington, Forrest, Greene, Jasper, Jefferson Davis and 9 more	9 hr
Jan 9, 11:02 AM CST	Mesoscale Discussion	SPC	Clarke, Jasper, Lauderdale, Newton, Smith	118 min
Jan 9, 12:38 PM CST	Mesoscale Discussion	SPC	Adams, Amite, Franklin, Pike, Wilkinson	2 hr
Jan 9, 3:43 PM CST	Mesoscale Discussion	SPC	Greene	2 hr
Jan 9, 4:56 PM CST	Mesoscale Discussion	SPC	George, Hancock, Harrison, Jackson, Pearl River, Stone	2 hr

Nearby

Mesoscale Discussions in Mississippi, 2022 Every mesoscale discussion in 2022

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.