Alert archive / Nevada / Special Weather Statements in 2021

Special Weather Statement, NWS Elko, NV

August 21, 2021White Pine County, Nevada

NWS Elko, NV issued this special weather statement at Aug 21, 2021, 4:37 PM PDT for White Pine County, Nevada. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 21, 2021, 4:37 PM PDT (23:37 UTC)
Expired
Aug 21, 2021, 5:15 PM PDT
In force
38 min
Issued by
NWS Elko, NV
Hail
0.25 in
Wind
50

County White Pine County, NV

The radar

The Elko radar (KLRX), 192 km from the middle of the area, began a volume at 23:40 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 11.6 hours before the alert went out and 301 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-pSkew-T log-p diagram, Salt Lake City I, UT at 12:00Z on 2021-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 77 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 12:00Z on 2021-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 239 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
77 J/kg
Mixed-layer CIN
-271 J/kg
Mixed-layer LCL
2167 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
239 m²/s²
0-3 km storm-relative helicity
260 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Elko, NV wrote its last area forecast discussion before this special weather statement went out at Aug 21, 3:11 PM PDT, 1 hour 26 minutes earlier.

Area forecast discussion, Aug 21, 3:11 PM PDT, 1 hour 26 minutes before
Area Forecast Discussion
National Weather Service Elko NV
311 PM PDT Sat Aug 21 2021

.UPDATE...Thunderstorms have developed across White Pine,
southeast Elko and southern Eureka counties. Red Flag Warning
continues for eastern Elko fire zone. Some storms could be
stronger with small hail and gusty winds. Isolated showers/storms
possible along the northern border, but overall threat for dry
lightning has diminished and therefore have cancelled Red Flag
Warnings for Humboldt (437), western Elko (438) and central Elko
(469).

&&

.PREV DISCUSSION... /ISSUED AT 119 PM /

SYNOPSIS...Elevated fire weather threat through this evening as
thunderstorms with dry lightning and gusty outflow winds push across
the northern border and down into White Pine county. Breezy winds
also expected outside of any storms. A dry and warming trend
expected Sunday onward. Smoke and haze will likely impact the
region over the coming days.

SHORT TERM...This afternoon through Monday evening...

An upper-level low/trough will continue to pass through the
region, dragging a cold front with it. Scattered showers and
storms expected this afternoon/evening across northern border into
White Pine county. Activity will be high based with a dry
subcloud layer. PWAT values of around 0.50"-0.80", highest in
eastern Elko and northeast White Pine counties. In addition, storm
motions will likely be quick at around 20-30kts. This would tend
to favor mainly dry storms with gusty downdraft/outflow winds.
Some strong to potentially severe wind gusts possible over eastern
Elko and White Pine counties where ample daytime heating and
destabilization will lead to inverted V soundings and large DCAPE
values. In addition, breezy to windy conditions expected across
the area due to tighter gradient with frontal passage. Highs today
in the upper 70s to 80s. Showers/storms should push out of the
east by around 06Z. Cooler tonight with skies clearing and winds
decreasing. Lows in the 40s to mid 50s. Southwest flow aloft
expected over the region for Sunday and Monday with drier and
warmer conditions expected. A subtle shortwave and elevated pocket
of higher PWAT values passing through flow aloft could result in
some cu buildups and mainly virga showers over eastern Elko county
on Sunday afternoon/evening. Highs in the 80s to low 90s, warmest
on Monday. Locally breezy winds possible each afternoon as well.
Nighttime lows in the upper 40s to 50s. Smoke and haze from the
large California fires will continue to impact the region, with
degraded visibility and air quality possible.

LONG TERM...Monday night through next Saturday...

The models remain in agreement that high pressure will continue to
migrate west through TX next week and reach the Desert Southwest
near week's end. As a result, increasing temperatures, dry
conditions and breezy southwest winds are forecasted. Haze and smoke
are also possible next week.  Early next week, daytime highs in the
80s are forecasted to rise to the lower 90s near next weekend.
Overnight low temperatures are forecasted to range from the mid-40s
early in the week to the to upper 50s next weekend.

AVIATION...Scattered high based showers and thunderstorms expected
through evening. A few showers/storms could approach the taf sites
except TPH. Gusty downdraft/outflow winds will be possible. Breezy
south to southwest winds 15-20g25-30kts through evening, decreasing
tonight to generally less than 10kts, then becoming 10-15kts
tomorrow afternoon. Haze and smoke expected with MVFR skies
possible through the period.

FIRE WEATHER...Critical fire conditions expected near the
northern state border due to scattered dry lightning producing
thunderstorms with gusty outflow winds. Breezy to windy conditions
expected outside of any convection with frontal passage through
this evening, but should remain below critical thresholds. A dry
and warming trend expected Sunday into next week, with some
breezy conditions possible each afternoon.

.UPDATE...Thunderstorms have developed across White Pine,
southeast Elko and southern Eureka counties. Red Flag Warning
continues for eastern Elko fire zone. Some storms could be
stronger with small hail and gusty winds. Isolated showers/storms
possible along the northern border, but overall threat for dry
lightning has diminished and therefore have cancelled Red Flag
Warnings for Humboldt (437), western Elko (438) and central Elko
(469).

&&

.LKN WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning until 11 PM PDT this evening for Eastern Elko
County.

&&

87/87/89/87/87

In the hours before

Special weather statement, Aug 21, 2:09 PM PDT, 2 hours 28 minutes before
Special Weather Statement
National Weather Service Elko NV
209 PM PDT Sat Aug 21 2021

NVZ035-039-212200-
South Central Elko County NV-White Pine County NV-
209 PM PDT Sat Aug 21 2021

...A strong thunderstorm will impact portions of northwestern White
Pine and southeastern Elko Counties through 300 PM PDT...

At 208 PM PDT, Doppler radar was tracking a strong thunderstorm 15
miles west of Currie, moving northeast at 30 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Currie and Big Bald Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3980 11553 3984 11568 4009 11545 4070 11474
      4027 11446
TIME...MOT...LOC 2108Z 239DEG 49KT 4031 11504

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

87
Special weather statement, Aug 21, 3:05 PM PDT, 1 hour 32 minutes before
Special Weather Statement
National Weather Service Elko NV
305 PM PDT Sat Aug 21 2021

NVZ033-035-039-212230-
Southeastern Elko County NV-South Central Elko County NV-
White Pine County NV-
305 PM PDT Sat Aug 21 2021

...A strong thunderstorm will impact portions of north central White
Pine and southeastern Elko Counties through 330 PM PDT...

At 304 PM PDT, Doppler radar was tracking a strong thunderstorm near
Currie, moving east at 35 mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Currie, Lages Junction and White Horse Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3997 11496 4021 11506 4052 11431 4019 11410
TIME...MOT...LOC 2204Z 256DEG 58KT 4018 11478

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

87
Special weather statement, Aug 21, 4:37 PM PDT, 0 minutes before
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The office that day

Everything else NWS Elko, NV issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 21, 2:09 PM PDTSpecial Weather StatementLKN51 min
Aug 21, 3:05 PM PDTSpecial Weather StatementLKN25 min

Nearby

Special Weather Statements in Nevada, 2021Every special weather statement 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.