Alert archive / Florida / Mesoscale Discussions in 2013

Mesoscale Discussion 295

March 23, 20135 counties in Alabama; 15 counties in Florida; Decatur County, Seminole County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2013, 7:38 AM CDT for 5 counties in Alabama; 15 counties in Florida; Decatur County, Seminole County, Georgia. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
Mar 23, 2013, 7:38 AM CDT (12:38 UTC)
Expired
Mar 23, 2013, 9:15 AM CDT
In force
97 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 22 counties

Baldwin County, AL, Covington County, AL, Escambia County, AL, Geneva County, AL, Mobile County, AL, Bay County, FL, Calhoun County, FL, Escambia 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, Santa Rosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Decatur County, GA, Seminole County, GA

The radar

The Eglin Afb radar (KEVX), 9 km from the middle of the area, began a volume at 12:41 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, 0.6 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 2013-03-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 65 joules per kilogram.LCLLFCEL10008507005003002001001 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 2013-03-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 225 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
65 J/kg
Mixed-layer CIN
-355 J/kg
Mixed-layer LCL
513 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
225 m²/s²
0-3 km storm-relative helicity
329 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.0

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
Mar 23, 3:41 AM CDTMesoscale DiscussionSPCBlount, Colbert, Cullman, Fayette, Franklin, Jefferson and 12 more64 min
Mar 23, 12:35 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 8 more85 min
Mar 23, 12:56 PM CDTSevere Thunderstorm WatchSPCBaldwin, Barbour, Bullock, Butler, Choctaw, Clarke and 19 more9 hr
Mar 23, 2:52 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 13 more83 min
Mar 23, 5:22 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 13 more53 min
Mar 23, 6:24 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Butler, Chilton, Choctaw and 24 more66 min
Mar 23, 6:42 PM CDTSevere Thunderstorm WatchSPCAutauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more7 hr
Mar 23, 6:49 PM CDTMesoscale DiscussionSPCGreene, Lamar, Pickens, Sumter116 min
Mar 23, 9:54 AM CDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Clay, Columbia, Duval and 7 more36 min
Mar 23, 9:59 AM CDTSevere Thunderstorm WatchSPCBaker, Bradford, Clay, Columbia, Duval, Hamilton and 8 more6 hr
Mar 23, 11:16 AM CDTMesoscale DiscussionSPCBay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 6 more89 min
Mar 23, 12:25 PM CDTMesoscale DiscussionSPCBradford, Clay, Columbia, Union35 min
Mar 23, 1:15 PM CDTMesoscale DiscussionSPCAlachua, Brevard, Citrus, Hardee, Hernando, Hillsborough and 11 more2 hr
Mar 23, 1:44 PM CDTMesoscale DiscussionSPCBaker, Bradford, Clay, Columbia, Duval, Hamilton and 4 more31 min
Mar 23, 3:33 PM CDTMesoscale DiscussionSPCBaker, Bradford, Clay, Columbia, Duval, Nassau and 1 more27 min

Nearby

Mesoscale Discussions in Florida, 2013Mesoscale Discussions in Alabama, 2013Mesoscale Discussions in Georgia, 2013Every mesoscale discussion in 2013

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.