Alert archive / Minnesota / Mesoscale Discussions in 2021
Mesoscale Discussion 1338
The Storm Prediction Center issued this mesoscale discussion at Jul 24, 2021, 1:10 AM CDT for 15 counties in Minnesota. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Jul 24, 2021, 1:10 AM CDT (06:10 UTC)
- Expired
- Jul 24, 2021, 2:45 AM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 388...389
Counties Big Stone County, MN, Chippewa County, MN, Douglas County, MN, Grant County, MN, Kandiyohi County, MN, Meeker County, MN, Otter Tail County, MN, Pope County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Traverse County, MN, Wadena County, MN, Wilkin County, MN
The radar
The Minneapolis radar (KMPX), 190 km from the middle of the area, began a volume at 06:14 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
Minneapolis, MN (KMPX), launched 00:00Z, 6.2 hours before the alert went out and 187 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
- 2540 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 1098 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 143 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.4
The text
As transmitted.
628
ACUS11 KWNS 240611
SWOMCD
SPC MCD 240610
MNZ000-SDZ000-240745-
Mesoscale Discussion 1338
NWS Storm Prediction Center Norman OK
0110 AM CDT Sat Jul 24 2021
Areas affected...Portions of far eastern SD into west-central MN
Concerning...Severe Thunderstorm Watch 388...389...
Valid 240610Z - 240745Z
The severe weather threat for Severe Thunderstorm Watch 388, 389
continues.
SUMMARY...An isolated strong to severe wind threat should continue
into west-central Minnesota early this morning.
DISCUSSION...A wind gust to 63 mph was recently measured at a
mesonet site in far northeastern SD with a small cluster of storms.
There is convection occurring ahead of this cluster in a low-level
warm advection regime across west-central MN. Still, the airmass
downstream across this region remains somewhat favorable for
surface-based storms, with around 2000 J/kg of MLCAPE present per
latest mesoanalysis estimates. The influence of glancing ascent
associated with an upper-level trough and modestly enhanced
mid-level winds should continue to support storm organization early
this morning. With the mainly linear structure ongoing ahead of a
surface cold front, isolated strong to severe winds gusts should
remain the primary threat in the short term. Some hail may also
occur. It remains unclear how long the severe threat will continue
across MN, as the better boundary-layer instability and potential
for surface-based storms will probably remain slightly to the south
of a convectively reinforced boundary extending across central MN.
..Gleason.. 07/24/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...DLH...MPX...FGF...ABR...
LAT...LON 44879536 45309682 45869650 46229650 46559649 46749605
46739506 46269450 45119438 44869475 44879536SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 7:44 PM CDT | Mesoscale Discussion | SPC | Aitkin, Carlton, Cass, Lake, Saint Louis | 2 hr |
| Jul 23, 9:07 PM CDT | Mesoscale Discussion | SPC | Lac qui Parle, Lincoln, Lyon, Murray, Pipestone, Redwood and 2 more | 2 hr |
| Jul 23, 10:33 PM CDT | Mesoscale Discussion | SPC | Big Stone, Clay, Grant, Otter Tail, Stevens, Traverse and 1 more | 117 min |
| Jul 23, 11:22 PM CDT | Severe Thunderstorm Watch | SPC | Anoka, Benton, Big Stone, Chippewa, Douglas, Grant and 16 more | 4 hr |
Nearby
Mesoscale Discussions in Minnesota, 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.