Alert archive / Utah / Mesoscale Discussions in 2021
Mesoscale Discussion 1356
The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2021, 3:01 PM PDT for Lincoln County, Nye County, Nevada; 6 counties in Utah. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- Jul 26, 2021, 3:01 PM PDT (22:01 UTC)
- Expired
- Jul 26, 2021, 5:00 PM PDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 5%
Counties Lincoln County, NV, Nye County, NV, Beaver County, UT, Garfield County, UT, Iron County, UT, Kane County, UT, Piute County, UT, Washington County, UT
The radar
The Cedar City radar (KICX), 133 km from the middle of the area, began a volume at 22:00 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
Las Vegas, NV (KVEF), launched 12:00Z, 10.0 hours before the alert went out and 198 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
- 467 J/kg
- Mixed-layer CIN
- -144 J/kg
- Mixed-layer LCL
- 1095 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -37 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
829
ACUS11 KWNS 262202
SWOMCD
SPC MCD 262201
UTZ000-AZZ000-NVZ000-270000-
Mesoscale Discussion 1356
NWS Storm Prediction Center Norman OK
0501 PM CDT Mon Jul 26 2021
Areas affected...Southwest UT into southern NV
Concerning...Severe potential...Watch unlikely
Valid 262201Z - 270000Z
Probability of Watch Issuance...5 percent
SUMMARY...Thunderstorm clusters capable of locally strong/severe
wind gusts and perhaps some hail will continue through the
afternoon.
DISCUSSION...A few areas of stronger thunderstorms have developed
across portions of southwest UT into southern NV, within an
environment characterized by MLCAPE of 1000-1500 J/kg and effective
shear generally ranging from 15-25 kt, per recent objective
mesoanalyses. While this environment is only supportive of transient
storm organization, modestly-enhanced steering flow to the north of
the weak midlevel trough over southern CA may support a couple of
outflow-driven clusters capable of isolated strong/severe wind
gusts. Instability may also be sufficient to support a marginal hail
risk with the strongest updrafts.
..Dean/Grams.. 07/26/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...SLC...VEF...LKN...
LAT...LON 38751243 38251139 37611130 37131194 36841333 36851384
36991603 37211745 37281755 38271766 38501712 38931461
38931361 38751243SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 25, 7:45 PM PDT | Mesoscale Discussion | SPC | Clark | 90 min |
Nearby
Mesoscale Discussions in Utah, 2021Mesoscale Discussions in Nevada, 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.