Alert archive / Alabama / Mesoscale Discussions in 2008

Mesoscale Discussion 258

February 17, 200822 counties in Alabama; 13 counties in Florida; 20 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Feb 17, 2008, 12:14 PM CST for 22 counties in Alabama; 13 counties in Florida; 20 counties in Georgia. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Feb 17, 2008, 12:14 PM CST (18:14 UTC)
Expired
Feb 17, 2008, 1:45 PM CST
In force
91 min
Issued by
the Storm Prediction Center
All 55 counties

Autauga County, AL, Barbour County, AL, Bullock County, AL, Chambers County, AL, Clay County, AL, Coffee County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Elmore County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Tallapoosa County, AL, Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Leon County, FL, Liberty County, FL, Okaloosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Calhoun County, GA, Chattahoochee County, GA, Clay County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Harris County, GA, Marion County, GA, Miller County, GA, Mitchell County, GA, Muscogee County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Stewart County, GA, Terrell County, GA, Troup County, GA, Webster County, GA

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 6.2 hours before the alert went out and 164 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-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 12:00Z on 2008-02-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 12:00Z on 2008-02-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 268 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
766 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
268 m²/s²
0-3 km storm-relative helicity
304 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.

IssuedProductOfficeCountiesLasted
Feb 17, 2:13 AM CSTMesoscale DiscussionSPCMobile32 min
Feb 17, 4:19 AM CSTMesoscale DiscussionSPCColbert, Franklin, Lamar, Marion, Pickens56 min
Feb 17, 5:05 AM CSTMesoscale DiscussionSPCBaldwin, Choctaw, Clarke, Conecuh, Dallas, Escambia and 8 more55 min
Feb 17, 5:26 AM CSTTornado WatchSPCAutauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 14 more7 hr
Feb 17, 7:13 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Chilton, Choctaw, Clarke and 16 more62 min
Feb 17, 9:43 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Butler, Chilton, Choctaw, Clarke and 17 more62 min
Feb 17, 12:32 PM CSTTornado WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 28 more7 hr
Feb 17, 2:45 PM CSTMesoscale DiscussionSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 22 more90 min
Feb 17, 5:19 PM CSTMesoscale DiscussionSPCChambers, Dale, Geneva, Henry, Houston86 min
Feb 17, 5:58 PM CSTTornado WatchSPCBay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 6 more8 hr
Feb 17, 3:01 PM CSTTornado WatchSPCBaldwin, Banks, Barrow, Bartow, Bibb, Butts and 29 more5 hr

Nearby

Mesoscale Discussions in Alabama, 2008Mesoscale Discussions in Georgia, 2008Mesoscale Discussions in Florida, 2008Every mesoscale discussion in 2008

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.