Alert archive / Alabama / Mesoscale Discussions in 2009

Mesoscale Discussion 98

February 11, 200932 counties in Alabama; 5 counties in Florida; 4 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 11, 2009, 9:36 AM CST for 32 counties in Alabama; 5 counties in Florida; 4 counties in Mississippi. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Feb 11, 2009, 9:36 AM CST (15:36 UTC)
Expired: Feb 11, 2009, 11:00 AM CST
In force: 84 min
Issued by: the Storm Prediction Center

All 41 counties

Autauga County, AL, Baldwin County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Chambers County, AL, Chilton County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Geneva County, AL, Hale County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Pike County, AL, Russell County, AL, Tallapoosa County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Holmes County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, George County, MS, Greene County, MS, Harrison County, MS, Jackson County, MS

The radar

The Mobile radar (KMOB), 118 km from the middle of the area, began a volume at 15:35 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 17Feb 11, 11:10 AM CST

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 3.6 hours before the alert went out and 214 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: 42 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 539 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 361 m²/s²
0-3 km storm-relative helicity: 365 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 11, 10:02 AM CST	Mesoscale Discussion	SPC	Cullman, DeKalb, Jackson, Lawrence, Limestone, Madison and 3 more	88 min
Feb 11, 11:10 AM CST	Tornado Watch	SPC	Bibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 19 more	6 hr
Feb 11, 1:29 PM CST	Mesoscale Discussion	SPC	Bibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 13 more	2 hr
Feb 10, 11:45 PM CST	Tornado Watch	SPC	Coahoma, DeSoto, Tunica	6 hr
Feb 11, 12:37 AM CST	Mesoscale Discussion	SPC	Washington	53 min
Feb 11, 1:04 AM CST	Tornado Watch	SPC	Bolivar, Issaquena, Sharkey, Sunflower, Washington	5 hr
Feb 11, 2:30 AM CST	Mesoscale Discussion	SPC	Coahoma, DeSoto, Panola, Quitman, Tate, Tunica	90 min
Feb 11, 4:01 AM CST	Mesoscale Discussion	SPC	Adams, Bolivar, Claiborne, Humphreys, Issaquena, Jefferson and 4 more	89 min

Nearby

Mesoscale Discussions in Alabama, 2009 Mesoscale Discussions in Florida, 2009 Mesoscale Discussions in Mississippi, 2009 Every mesoscale discussion in 2009

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.