Alert archive / Mississippi / Mesoscale Discussions in 2019

Mesoscale Discussion 2239

December 29, 20198 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Dec 29, 2019, 3:36 PM CST for 8 counties in Mississippi. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Dec 29, 2019, 3:36 PM CST (21:36 UTC)
Expired: Dec 29, 2019, 4:30 PM CST
In force: 54 min
Issued by: the Storm Prediction Center

Counties Attala County, MS, Choctaw County, MS, Leake County, MS, Madison County, MS, Neshoba County, MS, Oktibbeha County, MS, Webster County, MS, Winston County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 92 km from the middle of the area, began a volume at 21:38 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, 9.6 hours before the alert went out and 93 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: 3 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 856 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 176 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
Dec 29, 12:58 PM CST	Mesoscale Discussion	SPC	Adams, Amite, Attala, Carroll, Choctaw, Claiborne and 22 more	3 hr
Dec 29, 2:56 PM CST	Tornado Watch	SPC	Adams, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 34 more	6 hr
Dec 29, 4:47 PM CST	Mesoscale Discussion	SPC	Clay, Itawamba, Lowndes, Monroe, Oktibbeha	88 min

Nearby

Mesoscale Discussions in Mississippi, 2019 Every mesoscale discussion in 2019

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.