Alert archive / Mississippi / Mesoscale Discussions in 2021
Mesoscale Discussion 874
The Storm Prediction Center issued this mesoscale discussion at Jun 7, 2021, 7:16 PM CDT for 10 counties in Arkansas; 20 counties in Mississippi; Fayette County, Shelby County, Tennessee. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Jun 7, 2021, 7:16 PM CDT (00:16 UTC)
- Expired
- Jun 7, 2021, 8:15 PM CDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 5%
All 32 counties
Arkansas County, AR, Crittenden County, AR, Cross County, AR, Lee County, AR, Lonoke County, AR, Monroe County, AR, Phillips County, AR, Prairie County, AR, St. Francis County, AR, Woodruff County, AR, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Coahoma County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tunica County, MS, Union County, MS, Yalobusha County, MS, Fayette County, TN, Shelby County, TN
The radar
The Memphis radar (KNQA), 94 km from the middle of the area, began a volume at 00:19 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, 0.3 hours before the alert went out and 36 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
- 705 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 678 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.0
The text
As transmitted.
304
ACUS11 KWNS 080017
SWOMCD
SPC MCD 080016
ALZ000-MSZ000-TNZ000-ARZ000-080115-
Mesoscale Discussion 0874
NWS Storm Prediction Center Norman OK
0716 PM CDT Mon Jun 07 2021
Areas affected...northern Mississippi...eastern Arkansas...and far
southwest Tennessee
Concerning...Severe potential...Watch unlikely
Valid 080016Z - 080115Z
Probability of Watch Issuance...5 percent
SUMMARY...The severe weather threat is waning across eastern
Arkansas and northern Mississippi.
DISCUSSION...A line/cluster of storms continues to move northeast
across eastern Arkansas and northern Mississippi. These cores have
shown significant weakening over the past hour and reports have
followed with no reports of winds in excess of 30 to 40 mph
recently. Expect this trend to continue as the boundary layer cools
through the evening and the storms move away from better low-level
flow and thermodynamics.
..Bentley/Thompson.. 06/08/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...BMX...MEG...JAN...LZK...
LAT...LON 34909204 35619113 35148883 34608829 34148814 33868856
33838912 33829025 34249141 34909204SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 11:17 AM CDT | Mesoscale Discussion | SPC | Ashley, Chicot, Columbia, Union | 118 min |
| Jun 8, 12:42 PM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 9 more | 6 hr |
| Jun 8, 2:47 PM CDT | Mesoscale Discussion | SPC | Issaquena, Sharkey, Warren | 118 min |
Nearby
Mesoscale Discussions in Mississippi, 2021Mesoscale Discussions in Arkansas, 2021Mesoscale Discussions in Tennessee, 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.