Alert archive / Idaho / Mesoscale Discussions in 2021

Mesoscale Discussion 1724

September 10, 2021Gooding County, Jerome County, Twin Falls County, Idaho; Elko County, Eureka County, Lander County, Nevada

The Storm Prediction Center issued this mesoscale discussion at Sep 10, 2021, 1:02 PM MDT for Gooding County, Jerome County, Twin Falls County, Idaho; Elko County, Eureka County, Lander County, Nevada. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Sep 10, 2021, 1:02 PM MDT (19:02 UTC)
Expired: Sep 10, 2021, 3:00 PM MDT
In force: 118 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 5%

Counties Gooding County, ID, Jerome County, ID, Twin Falls County, ID, Elko County, NV, Eureka County, NV, Lander County, NV

The radar

The Elko radar (KLRX), 106 km from the middle of the area, began a volume at 19:03 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

Elko, NV (KLKN), launched 12:00Z, 7.0 hours before the alert went out and 114 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 3 J/kg
Mixed-layer CIN: -243 J/kg
Mixed-layer LCL: 2286 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: -85 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

595 
ACUS11 KWNS 101903
SWOMCD
SPC MCD 101902 
UTZ000-IDZ000-NVZ000-102100-

Mesoscale Discussion 1724
NWS Storm Prediction Center Norman OK
0202 PM CDT Fri Sep 10 2021

Areas affected...Northeast Nevada...southwest Idaho

Concerning...Severe potential...Watch unlikely 

Valid 101902Z - 102100Z

Probability of Watch Issuance...5 percent

SUMMARY...A few strong to severe wind gusts will become more likely
through the the afternoon. Limited coverage of these wind gusts
should preclude watch issuance.

DISCUSSION...Strong surface heating has steepened low-level lapse
rates across central/northeastern Nevada. Buoyancy remains quite
limited given the marginal surface moisture. Even so, isolated
storms have developed over the last 30-45 minutes. This activity as
well as new storms should continue to develop and deepen into the
afternoon as the surface continues to warm and subtle mid-level
cooling occurs. Modest flow thorough the lowest 4 km will combine
with strong evaporatively driven downdraft accelerations to produce
a few strong to marginally severe wind gusts. Though storm coverage
may approached scattered criteria, minimal buoyancy will keep the
severe threat isolated. No watch is anticipated.

..Wendt/Thompson.. 09/10/2021

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...SLC...PIH...BOI...LKN...REV...

LAT...LON   39491772 41211693 42671612 43161506 42701424 41991387
            41221392 40821406 40041439 39321520 38921616 38891674
            39491772

Nearby

Mesoscale Discussions in Idaho, 2021 Mesoscale Discussions in Nevada, 2021 Every 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.