Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 227

February 25, 20138 counties in Alabama; Escambia County, Santa Rosa County, Florida; 31 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 25, 2013, 7:57 PM CST for 8 counties in Alabama; Escambia County, Santa Rosa County, Florida; 31 counties in Mississippi. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Feb 25, 2013, 7:57 PM CST (01:57 UTC)
Expired: Feb 25, 2013, 9:00 PM CST
In force: 63 min
Issued by: the Storm Prediction Center

All 41 counties

Baldwin County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Escambia County, FL, Santa Rosa County, FL, Attala County, MS, Carroll County, MS, Choctaw County, MS, Clarke County, MS, Forrest County, MS, George County, MS, Greene County, MS, Harrison County, MS, Holmes County, MS, Jackson County, MS, Jasper County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Leake County, MS, Leflore County, MS, Lowndes County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pearl River County, MS, Perry County, MS, Scott County, MS, Smith County, MS, Stone County, MS, Wayne County, MS, Webster County, MS, Winston County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 115 km from the middle of the area, began a volume at 01:57 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 00:00Z, 2.0 hours before the alert went out and 125 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: 5 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 517 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 339 m²/s²
0-3 km storm-relative helicity: 596 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 25, 9:31 PM CST	Mesoscale Discussion	SPC	Baldwin, Covington, Escambia, Mobile	59 min
Feb 25, 11:59 PM CST	Tornado Watch	SPC	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 12 more	8 hr
Feb 26, 2:51 AM CST	Mesoscale Discussion	SPC	Calhoun, Dixie, Gadsden, Gulf, Hamilton, Jackson and 8 more	114 min
Feb 26, 5:19 AM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 16 more	116 min
Feb 26, 5:49 AM CST	Tornado Watch	SPC	Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 31 more	8 hr
Feb 26, 10:38 AM CST	Mesoscale Discussion	SPC	Charlotte, Citrus, Clay, DeSoto, Duval, Flagler and 19 more	67 min
Feb 25, 6:43 PM CST	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Copiah, Franklin, Hinds and 10 more	62 min

Nearby

Mesoscale Discussions in Mississippi, 2013 Mesoscale Discussions in Alabama, 2013 Mesoscale Discussions in Florida, 2013 Every mesoscale discussion in 2013

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.