Alert archive / Florida / Mesoscale Discussions in 2009

Mesoscale Discussion 229

March 15, 20094 counties in Alabama; 8 counties in Florida; 7 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 15, 2009, 11:13 AM CDT for 4 counties in Alabama; 8 counties in Florida; 7 counties in Georgia. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Mar 15, 2009, 11:13 AM CDT (16:13 UTC)
Expired: Mar 15, 2009, 1:45 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Okaloosa County, FL, Walton County, FL, Washington County, FL, Clay County, GA, Early County, GA, Miller County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Webster County, GA

The radar

The Eglin Afb radar (KEVX), 40 km from the middle of the area, began a volume at 16:14 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, 4.2 hours before the alert went out and 165 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: 27 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 571 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 196 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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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.