Alert archive / Alabama / Mesoscale Discussions in 2019

Mesoscale Discussion 332

April 13, 201921 counties in Alabama; 15 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2019, 11:01 PM CDT for 21 counties in Alabama; 15 counties in Mississippi. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Apr 13, 2019, 11:01 PM CDT (04:01 UTC)
Expired
Apr 14, 2019, 1:00 AM CDT
In force
119 min
Issued by
the Storm Prediction Center
All 36 counties

Bibb County, AL, Choctaw County, AL, Clarke County, AL, Dallas County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Lamar County, AL, Marengo County, AL, Marion County, AL, Mobile County, AL, Monroe County, AL, Perry County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Washington County, AL, Wilcox County, AL, Winston County, AL, Clarke County, MS, Forrest County, MS, George County, MS, Greene County, MS, Itawamba County, MS, Jackson County, MS, Kemper County, MS, Lauderdale County, MS, Lee County, MS, Lowndes County, MS, Monroe County, MS, Noxubee County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Columbus AFB radar (KGWX), 148 km from the middle of the area, began a volume at 04:01 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 watches that followed

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

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 4.0 hours before the alert went out and 159 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, Birmingham, AL at 00:00Z on 2019-04-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 506 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, Birmingham, AL at 00:00Z on 2019-04-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 240 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
506 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
1458 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
240 m²/s²
0-3 km storm-relative helicity
428 m²/s²
Significant tornado parameter
0.6
Supercell composite
3.3

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 13, 7:11 PM CDTTornado WatchSPCBibb, Blount, Colbert, Cullman, Fayette, Franklin and 19 more11 hr
Apr 13, 8:25 PM CDTMesoscale DiscussionSPCChoctaw, Washington95 min
Apr 13, 9:13 PM CDTMesoscale DiscussionSPCBibb, Blount, Chilton, Choctaw, Colbert, Cullman and 19 more92 min
Apr 13, 9:33 PM CDTTornado WatchSPCBaldwin, Choctaw, Clarke, Mobile, Monroe, Washington and 1 more8 hr
Apr 14, 12:39 AM CDTMesoscale DiscussionSPCCalhoun, Cherokee, Clay, Cleburne, DeKalb, Etowah and 2 more66 min
Apr 14, 1:04 AM CDTTornado WatchSPCAutauga, Barbour, Bullock, Calhoun, Chambers, Cherokee and 19 more9 hr
Apr 14, 2:15 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 10 more60 min
Apr 14, 2:45 AM CDTTornado WatchSPCButler, Coffee, Conecuh, Covington, Crenshaw, Dale and 4 more7 hr
Apr 14, 4:20 AM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 18 more115 min
Apr 14, 5:36 AM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 18 more54 min
Apr 14, 7:28 AM CDTMesoscale DiscussionSPCHenry, Houston3 hr
Apr 14, 9:40 AM CDTTornado WatchSPCHenry, Houston6 hr
Apr 14, 10:07 AM CDTMesoscale DiscussionSPCBarbour, Henry, Houston, Russell83 min
Apr 13, 8:31 PM CDTMesoscale DiscussionSPCAdams, Amite, Attala, Carroll, Choctaw, Claiborne and 17 more119 min

Nearby

Mesoscale Discussions in Alabama, 2019Mesoscale Discussions in Mississippi, 2019Every mesoscale discussion in 2019

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.