Alert archive / Florida / Mesoscale Discussions in 2009

Mesoscale Discussion 352

March 31, 20094 states

The Storm Prediction Center issued this mesoscale discussion at Mar 31, 2009, 5:12 PM CDT for 4 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Mar 31, 2009, 5:12 PM CDT (22:12 UTC)
Expired: Mar 31, 2009, 6:45 PM CDT
In force: 93 min
Issued by: the Storm Prediction Center

All 48 counties

Baldwin County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Okaloosa County, FL, Santa Rosa County, FL, Taylor County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Brooks County, GA, Calhoun County, GA, Colquitt County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Miller County, GA, Mitchell County, GA, Seminole County, GA, Thomas County, GA, Tift County, GA, Worth County, GA, George County, MS, Greene County, MS, Jackson County, MS, Perry County, MS

The radar

The Eglin Afb radar (KEVX), 43 km from the middle of the area, began a volume at 22:16 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 10.2 hours before the alert went out and 199 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2169 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 243 m²/s²
0-3 km storm-relative helicity: 172 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
Mar 31, 11:32 AM CDT	Mesoscale Discussion	SPC	Baldwin, Covington, Escambia, Mobile, Washington	88 min
Mar 31, 11:54 AM CDT	Mesoscale Discussion	SPC	Sumter	96 min
Mar 31, 1:05 PM CDT	Severe Thunderstorm Watch	SPC	Baldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 11 more	8 hr
Mar 31, 3:15 PM CDT	Mesoscale Discussion	SPC	Coffee, Covington, Dale, Escambia, Geneva, Henry and 1 more	90 min
Mar 31, 4:17 PM CDT	Mesoscale Discussion	SPC	Baker, Bradford, Clay, Columbia, Duval, Nassau and 2 more	28 min
Mar 31, 4:25 PM CDT	Severe Thunderstorm Watch	SPC	Baker, Columbia, Duval, Gilchrist, Hamilton, Nassau and 2 more	7 hr
Mar 31, 6:59 PM CDT	Mesoscale Discussion	SPC	Baker, Columbia, Hamilton, Jefferson, Lafayette, Leon and 5 more	91 min
Mar 31, 8:58 AM CDT	Mesoscale Discussion	SPC	Adams, Amite, Copiah, Covington, Forrest, Franklin and 13 more	92 min
Mar 31, 9:37 AM CDT	Severe Thunderstorm Watch	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 29 more	7 hr
Mar 31, 2:44 PM CDT	Mesoscale Discussion	SPC	Adams, Amite, Attala, Claiborne, Clarke, Copiah and 35 more	91 min

Nearby

Mesoscale Discussions in Florida, 2009 Mesoscale Discussions in Georgia, 2009 Mesoscale Discussions in Alabama, 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.