Alert archive / Alabama / Mesoscale Discussions in 2015

Mesoscale Discussion 448

April 25, 201515 counties in Alabama; Escambia County, Santa Rosa County, Florida; 4 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2015, 4:12 AM CDT for 15 counties in Alabama; Escambia County, Santa Rosa County, Florida; 4 counties in Mississippi. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
Apr 25, 2015, 4:12 AM CDT (09:12 UTC)
Expired
Apr 25, 2015, 5:15 AM CDT
In force
63 min
Issued by
the Storm Prediction Center
All 21 counties

Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Dallas County, AL, Escambia County, AL, Hale County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Perry County, AL, Sumter County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Santa Rosa County, FL, Clarke County, MS, George County, MS, Greene County, MS, Wayne County, MS

The watches that followed

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

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 9.2 hours before the alert went out and 197 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, Jackson, MS at 00:00Z on 2015-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 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, Jackson, MS at 00:00Z on 2015-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 220 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
2 J/kg
Mixed-layer CIN
-342 J/kg
Mixed-layer LCL
1029 m above ground
0-6 km bulk shear
75 kt
0-1 km storm-relative helicity
220 m²/s²
0-3 km storm-relative helicity
405 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
Apr 25, 12:50 AM CDTTornado WatchSPCDallas, Fayette, Greene, Hale, Lamar, Marengo and 4 more6 hr
Apr 25, 2:07 AM CDTMesoscale DiscussionSPCChoctaw, Greene, Pickens, Sumter, Tuscaloosa83 min
Apr 25, 5:00 AM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Clarke and 18 more7 hr
Apr 25, 7:41 AM CDTMesoscale DiscussionSPCCoffee, Covington, Dale, Geneva, Henry, Houston94 min
Apr 25, 9:35 AM CDTMesoscale DiscussionSPCBaldwin, Mobile, Washington115 min
Apr 25, 1:36 PM CDTSevere Thunderstorm WatchSPCBaldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 5 more4 hr
Apr 25, 1:50 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 4 more85 min
Apr 25, 2:10 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Bullock, Calhoun, Chambers, Chilton and 19 more95 min
Apr 25, 3:07 PM CDTSevere Thunderstorm WatchSPCBarbour, Coffee, Dale, Geneva, Henry, Houston and 1 more7 hr
Apr 25, 4:38 PM CDTSevere Thunderstorm WatchSPCBullock, Chambers, Clay, Lee, Macon, Randolph and 2 more5 hr
Apr 25, 8:08 AM CDTTornado WatchSPCBaker, Calhoun, Columbia, Duval, Franklin, Gadsden and 11 more7 hr
Apr 25, 11:20 AM CDTMesoscale DiscussionSPCColumbia, Gadsden, Hamilton, Jefferson, Lafayette, Leon and 5 more85 min
Apr 25, 2:30 PM CDTMesoscale DiscussionSPCBaker, Columbia, Duval, Gadsden, Hamilton, Jefferson and 5 more60 min
Apr 25, 6:19 PM CDTMesoscale DiscussionSPCCalhoun, Franklin, Gadsden, Gulf, Hamilton, Jackson and 6 more56 min
Apr 24, 9:20 PM CDTMesoscale DiscussionSPCIssaquena, Sharkey, Warren, Washington55 min
Apr 24, 9:59 PM CDTTornado WatchSPCBolivar, Humphreys, Issaquena, Sharkey, Sunflower, Warren and 2 more4 hr
Apr 24, 11:45 PM CDTMesoscale DiscussionSPCAttala, Carroll, Choctaw, Holmes, Humphreys, Issaquena and 10 more90 min
Apr 25, 10:41 AM CDTSevere Thunderstorm WatchSPCAmite, Covington, Forrest, George, Greene, Hancock and 15 more7 hr

Nearby

Mesoscale Discussions in Alabama, 2015Mesoscale Discussions in Mississippi, 2015Mesoscale Discussions in Florida, 2015Every mesoscale discussion in 2015

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.