Alert archive / Mississippi / Mesoscale Discussions in 2021
Mesoscale Discussion 143
The Storm Prediction Center issued this mesoscale discussion at Feb 28, 2021, 8:49 PM CST for Colbert County, Lauderdale County, Alabama; 6 counties in Mississippi. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Feb 28, 2021, 8:49 PM CST (02:49 UTC)
- Expired
- Feb 28, 2021, 9:45 PM CST
- In force
- 56 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 20%
Counties Colbert County, AL, Lauderdale County, AL, Alcorn County, MS, Benton County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS
The radar
The Columbus AFB radar (KGWX), 96 km from the middle of the area, began a volume at 02:48 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
Little Rock, AR (KLZK), launched 00:00Z, 2.8 hours before the alert went out and 152 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
- 229 J/kg
- Mixed-layer CIN
- -269 J/kg
- Mixed-layer LCL
- 782 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- -399 m²/s²
- 0-3 km storm-relative helicity
- -284 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -1.4
The text
As transmitted.
466
ACUS11 KWNS 010249
SWOMCD
SPC MCD 010249
ALZ000-TNZ000-MSZ000-010345-
Mesoscale Discussion 0143
NWS Storm Prediction Center Norman OK
0849 PM CST Sun Feb 28 2021
Areas affected...Northeast Mississippi...far northwest Alabama...and
far southern Tennessee
Concerning...Severe potential...Watch unlikely
Valid 010249Z - 010345Z
Probability of Watch Issuance...20 percent
SUMMARY...A well developed storm in northern Mississippi may pose a
severe threat for the next 30 to 45 minutes before weakening.
DISCUSSION...A well developed supercell in northern Mississippi will
continue northeastward over the next hour. However, the airmass
downstream of this storm is characterized by increasing inhibition
and limited instability with dewpoints near 60 degrees. This storm
will be capable of some damaging winds for the next 30 to 45 minutes
but should weaken beyond that time. Therefore, no downstream watch
is anticipated.
..Bentley/Goss.. 03/01/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...OHX...HUN...MEG...
LAT...LON 34908919 35248778 35118712 34958719 34858729 34688767
34448828 34398880 34408914 34518957 34908919SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 28, 6:27 PM CST | Mesoscale Discussion | SPC | Alcorn, Benton, Bolivar, Coahoma, DeSoto, Lafayette and 7 more | 93 min |
Nearby
Mesoscale Discussions in Mississippi, 2021Mesoscale Discussions in Alabama, 2021Every mesoscale discussion in 2021
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.