Alert archive / Wyoming / Mesoscale Discussions in 2025
Mesoscale Discussion 1069
The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2025, 7:05 PM MDT for 5 counties in Wyoming. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Jun 1, 2025, 7:05 PM MDT (01:05 UTC)
- Expired
- Jun 1, 2025, 8:30 PM MDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 5%
Counties Campbell County, WY, Crook County, WY, Johnson County, WY, Natrona County, WY, Washakie County, WY
The radar
The Riverton/Lander radar (KRIW), 203 km from the middle of the area, began a volume at 01:07 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
Riverton, WY (KRIW), launched 00:00Z, 1.1 hours before the alert went out and 197 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
- 3328 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
291
ACUS11 KWNS 020106
SWOMCD
SPC MCD 020105
WYZ000-020230-
Mesoscale Discussion 1069
NWS Storm Prediction Center Norman OK
0805 PM CDT Sun Jun 01 2025
Areas affected...North-central/northeast Wyoming
Concerning...Severe potential...Watch unlikely
Valid 020105Z - 020230Z
Probability of Watch Issuance...5 percent
SUMMARY...Severe winds and isolated large hail are possible with
storms this evening. A watch is not expected.
DISCUSSION...Outflow pushing westward has recently interacted with
portions of the Big Horns and promoted rather rapid convective
development despite very modest buoyancy. Additional activity has
also developed along the surface boundary. Given the steep mid-level
lapse rates sampled by the 00Z RIW sounding and 25-30 kts of shear,
a couple strong to severe storms are possible early this evening.
The primary concern would be severe wind gusts with isolated large
hail possible as well. A cell in Natrona county did show some signs
of weak low-level rotation. This is likely due to the modest surface
vorticity along the boundary. The tornado threat is quite low, but a
brief spin-up in this scenario could occur.
..Wendt/Hart.. 06/02/2025
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...UNR...CYS...BYZ...RIW...
LAT...LON 43610794 44430729 44720594 44860483 44700453 44190469
43840503 43190569 42770710 42950760 43610794
MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 95 MPH
MOST PROBABLE PEAK WIND GUST...UP TO 60 MPH
MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 INSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 2, 1:14 PM MDT | Mesoscale Discussion | SPC | Albany, Converse, Goshen, Laramie, Niobrara, Platte | 2 hr |
| Jun 2, 2:12 PM MDT | Severe Thunderstorm Watch | SPC | Goshen, Laramie, Niobrara, Platte | 6 hr |
| Jun 2, 4:55 PM MDT | Mesoscale Discussion | SPC | Goshen, Laramie, Platte | 2 hr |
Nearby
Mesoscale Discussions in Wyoming, 2025Every mesoscale discussion in 2025
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.