Alert archive / Mississippi / Mesoscale Discussions in 2021
Mesoscale Discussion 480
The Storm Prediction Center issued this mesoscale discussion at May 2, 2021, 6:51 PM CDT for 20 counties in Mississippi. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- May 2, 2021, 6:51 PM CDT (23:51 UTC)
- Expired
- May 2, 2021, 7:45 PM CDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 125
Counties Attala County, MS, Calhoun County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Leake County, MS, Leflore County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Oktibbeha County, MS, Pontotoc County, MS, Tallahatchie County, MS, Webster County, MS, Winston County, MS, Yalobusha County, MS, Yazoo County, MS
The radar
The Jackson/Brandon,MS radar (KDGX), 107 km from the middle of the area, began a volume at 23:55 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
Jackson, MS (KJAN), launched 12:00Z, 11.9 hours before the alert went out and 105 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1640 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
262
ACUS11 KWNS 022351
SWOMCD
SPC MCD 022351
MSZ000-030045-
Mesoscale Discussion 0480
NWS Storm Prediction Center Norman OK
0651 PM CDT Sun May 02 2021
Areas affected...Central Mississippi
Concerning...Tornado Watch 125...
Valid 022351Z - 030045Z
The severe weather threat for Tornado Watch 125 continues.
SUMMARY...Supercells with a history of tornadoes will likely persist
through early evening where a corridor of greater tornado risk
appears likely this evening.
DISCUSSION...Several small supercells along and west of I-55 have
produced confirmed tornadoes over the last 90 minutes. KDGX analysis
shows several low-level mesocyclones with VROTs of 40-50 kts and a
considerable TDS near Yazoo City, MS. SPC mesoanalysis and regional
VWPS show strong veering wind profiles with 200-300 m2/s2 ESRH ahead
of the ongoing storms to near the warm front across north-central
Mississippi. A corridor of greater tornado potential is likely
evolving. The potential exists for several additional tornadoes,
(possibly significant) to develop and track northeastward to the
warm front over the next 1 to 3 hours.
..Lyons.. 05/02/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MEG...JAN...
LAT...LON 32909053 33579039 34239013 34388969 34298927 34198886
33558871 33178875 32808902 32658931 32468980 32419002
32349060 32569071 32909053SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 3:33 PM CDT | Mesoscale Discussion | SPC | Adams, Amite, Claiborne, Copiah, Franklin, Hinds and 16 more | 117 min |
| May 2, 4:46 PM CDT | Tornado Watch | SPC | Attala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 34 more | 5 hr |
Nearby
Mesoscale Discussions in Mississippi, 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.