Alert archive / Mississippi / Mesoscale Discussions in 2014

Mesoscale Discussion 459

April 28, 20147 counties in Alabama; 10 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 28, 2014, 3:49 PM CDT for 7 counties in Alabama; 10 counties in Mississippi. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Apr 28, 2014, 3:49 PM CDT (20:49 UTC)
Expired: Apr 28, 2014, 5:15 PM CDT
In force: 86 min
Issued by: the Storm Prediction Center

Counties Colbert County, AL, Franklin County, AL, Lamar County, AL, Lawrence County, AL, Limestone County, AL, Marion County, AL, Winston County, AL, Choctaw County, MS, Clay County, MS, Itawamba County, MS, Leake County, MS, Lowndes County, MS, Monroe County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Winston County, MS

The radar

The Columbus AFB radar (KGWX), 19 km from the middle of the area, began a volume at 20:49 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 12:00Z, 8.8 hours before the alert went out and 152 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: 1223 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 477 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 268 m²/s²
0-3 km storm-relative helicity: 428 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 7.4

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
Apr 28, 6:57 AM CDT	Mesoscale Discussion	SPC	Lauderdale	2 hr
Apr 28, 9:53 AM CDT	Mesoscale Discussion	SPC	Fayette, Lamar, Marion, Pickens	97 min
Apr 28, 12:05 PM CDT	Mesoscale Discussion	SPC	Colbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 6 more	115 min
Apr 28, 12:39 PM CDT	Tornado Watch PDS	SPC	Colbert, Cullman, DeKalb, Fayette, Franklin, Greene and 14 more	8 hr
Apr 28, 2:09 PM CDT	Mesoscale Discussion	SPC	Blount, Colbert, Cullman, Fayette, Franklin, Jackson and 13 more	66 min
Apr 28, 5:22 PM CDT	Mesoscale Discussion	SPC	Colbert, Cullman, Fayette, Franklin, Jackson, Lamar and 9 more	83 min
Apr 28, 5:56 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Calhoun, Chambers, Cherokee, Chilton and 13 more	64 min
Apr 27, 7:03 PM CDT	Mesoscale Discussion	SPC	Calhoun, Chickasaw, Clay, Grenada, Itawamba, Lafayette and 10 more	87 min
Apr 28, 1:43 AM CDT	Tornado Watch	SPC	Alcorn, Benton, Calhoun, Chickasaw, Coahoma, DeSoto and 16 more	8 hr
Apr 28, 2:50 AM CDT	Mesoscale Discussion	SPC	Bolivar, Coahoma, Quitman, Tunica, Washington	115 min
Apr 28, 4:40 AM CDT	Tornado Watch	SPC	Bolivar, Carroll, Grenada, Holmes, Humphreys, Issaquena and 8 more	7 hr
Apr 28, 7:16 AM CDT	Mesoscale Discussion	SPC	Attala, Calhoun, Carroll, Choctaw, Claiborne, Grenada and 14 more	89 min

Nearby

Mesoscale Discussions in Mississippi, 2014 Mesoscale Discussions in Alabama, 2014 Every mesoscale discussion in 2014

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.