Alert archive / Mississippi / Mesoscale Discussions in 2019
Mesoscale Discussion 331
The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2019, 9:13 PM CDT for 25 counties in Alabama; 31 counties in Mississippi. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Apr 13, 2019, 9:13 PM CDT (02:13 UTC)
- Expired
- Apr 13, 2019, 10:45 PM CDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 56 counties
Bibb County, AL, Blount County, AL, Chilton County, AL, Choctaw County, AL, Colbert County, AL, Cullman County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lawrence County, AL, Marengo County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clarke County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Itawamba County, MS, Jasper County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Lee County, MS, Lowndes County, MS, Madison County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pontotoc County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS
The radar
The Columbus AFB radar (KGWX), 42 km from the middle of the area, began a volume at 02:12 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, 2.2 hours before the alert went out and 140 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.
- 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
The text
As transmitted.
065
ACUS11 KWNS 140213
SWOMCD
SPC MCD 140213
ALZ000-MSZ000-140345-
Mesoscale Discussion 0331
NWS Storm Prediction Center Norman OK
0913 PM CDT Sat Apr 13 2019
Areas affected...Eastern Mississippi and northwest Alabama
Concerning...Tornado Watch 55...
Valid 140213Z - 140345Z
The severe weather threat for Tornado Watch 55 continues.
SUMMARY...The severe weather threat continues across tornado watch
55. The primary threat will likely be damaging winds into the
overnight hours.
DISCUSSION...The cold front is currently surging across Mississippi
and has started to catch the pre frontal convection in north central
Mississippi. As this front continues to move eastward, bowing line
segments may become increasingly likely with the threat for damaging
winds. Given the strong low-level helicity across the area (greater
than 500 m2/s2 per HTX VWP), embedded QLCS tornadoes are possible.
The warm front may lift a few counties north in the next few hours
to the northern most row of counties in Alabama. The greatest
damaging wind threat will be anywhere south of this warm front with
the tornado threat maximized in close proximity to this warm front
where low-level flow will be more backed.
..Bentley.. 04/14/2019
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...BMX...HUN...MOB...MEG...JAN...
LAT...LON 34058980 34498873 34718793 34848735 34778679 34678626
34028622 33188629 32428703 31738888 31778940 31959044
32749033 34058980SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 13, 7:11 PM CDT | Tornado Watch | SPC | Bibb, Blount, Colbert, Cullman, Fayette, Franklin and 19 more | 11 hr |
| Apr 13, 8:25 PM CDT | Mesoscale Discussion | SPC | Choctaw, Washington | 95 min |
| Apr 13, 9:33 PM CDT | Tornado Watch | SPC | Baldwin, Choctaw, Clarke, Mobile, Monroe, Washington and 1 more | 8 hr |
| Apr 13, 11:01 PM CDT | Mesoscale Discussion | SPC | Bibb, Choctaw, Clarke, Dallas, Fayette, Franklin and 15 more | 119 min |
| Apr 14, 12:39 AM CDT | Mesoscale Discussion | SPC | Calhoun, Cherokee, Clay, Cleburne, DeKalb, Etowah and 2 more | 66 min |
| Apr 14, 1:04 AM CDT | Tornado Watch | SPC | Autauga, Barbour, Bullock, Calhoun, Chambers, Cherokee and 19 more | 9 hr |
| Apr 14, 2:15 AM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 10 more | 60 min |
| Apr 14, 2:45 AM CDT | Tornado Watch | SPC | Butler, Coffee, Conecuh, Covington, Crenshaw, Dale and 4 more | 7 hr |
| Apr 14, 4:20 AM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 18 more | 115 min |
| Apr 14, 5:36 AM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Blount, Calhoun, Chambers, Cherokee and 18 more | 54 min |
| Apr 14, 7:28 AM CDT | Mesoscale Discussion | SPC | Henry, Houston | 3 hr |
| Apr 14, 9:40 AM CDT | Tornado Watch | SPC | Henry, Houston | 6 hr |
| Apr 14, 10:07 AM CDT | Mesoscale Discussion | SPC | Barbour, Henry, Houston, Russell | 83 min |
| Apr 13, 8:31 PM CDT | Mesoscale Discussion | SPC | Adams, Amite, Attala, Carroll, Choctaw, Claiborne and 17 more | 119 min |
Nearby
Mesoscale Discussions in Mississippi, 2019Mesoscale Discussions in Alabama, 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.