Alert archive / Nevada / Special Weather Statements in 2021

Special Weather Statement, NWS Elko, NV

July 4, 2021

NWS Elko, NV issued this special weather statement at Jul 4, 2021, 2:20 PM PDT. It was in force for 40 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
Jul 4, 2021, 2:20 PM PDT (21:20 UTC)
Expired
Jul 4, 2021, 3:00 PM PDT
In force
40 min
Issued by
NWS Elko, NV

The radar

The Salt Lake City radar (KMTX), 165 km from the middle of the area, began a volume at 21:23 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, 9.3 hours before the alert went out and 46 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, Elko, NV at 12:00Z on 2021-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 41 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, Elko, NV at 12:00Z on 2021-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 square meters per square second.193958Sfc1 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
41 J/kg
Mixed-layer CIN
-300 J/kg
Mixed-layer LCL
2639 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
-58 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Jul 4, 3:45 AM PDT, 10 hours 35 minutes earlier.

Area forecast discussion, Jul 4, 3:45 AM PDT, 10 hours 35 minutes before
Area Forecast Discussion
National Weather Service Elko NV
345 AM PDT Sun Jul 4 2021

.SYNOPSIS...A disturbance passing along the northern Nevada border
will trigger scattered showers and thunderstorms today, with
brief heavy showers and gusty winds possible. Drier and warmer
conditions are expected Monday on into next week.

&&

.SHORT TERM...Today through Monday. Shortwave energy over west-
central and NW Nevada early this morning will produce instability
over much of northern NV later this morning and into this
afternoon as the energy pushes NE up into Idaho. The increased
instability in combination with significant mid-level moisture
will produce showers and thunderstorms over most of northern and
portions of central NV today. The driest air and weakest
instability today will be over Northern Nye county, where any
storms that develop are expected to be isolated. For most of the
rest of the CWA, Precipitable Water values between 0.90 and 1.05
and surface Dew Point in the upper 40s to low 50s suggest some
cells may again produce some moderate to heavy downpours. CAPE
values today are weak to moderate, generally between 50 and 220
J/KG. However, Bulk Shear values are relatively high, suggesting
some cells today may be stronger than we have seen in the past
week or so. Drier and more stable air pushing up through central
NV should help end most of the convection by the mid-evening
hours. High pressure building up from the SE on Monday will put
an end to showers and thunderstorms, and begin a warming trend.

.LONG TERM...Monday night through next Sunday

Model agreement continues to see a return of the ridge with a
closed upper-level high settle right over the region Tuesday.
Heat is expected be the primary concern for the week, but mid-week
does present a secondary issue of some fire weather concerns
across the region. By Wednesday, model agreement sees a trough
pass through the Northern Rockies allowing for the a slight
flattening of the ride Wednesday and Thursday. While no
precipitation is expected, winds are excepted to pick up those
afternoon under what is already excepted to be dry and hot
conditions. As it stands current guidance doesn’t expect winds
to meet criteria, so products are being held off for now.

As the high continues to settle in, dry and warm conditions
continue to be the common denominator for each day clear into the
following weekend. Look to see temperatures in high 90s to triple
digits with a few locations having the potential to break records
over the week. Meanwhile, overnight temperatures will provide
little in terms of relief from the heat as locations nestled
around the low to mid- 60s. West Wendover, especially, will be a
concern as lows only drop into the 70s for the week. However,
cloud cover from remnant moisture may help alleviate concerns of
heat risks and provide some relief to the region. Currently there
are no heat related products out for the time frame, but this
could changes as models and guidance continue to bring the
conditions into better focus.

&&

.AVIATION...A weather disturbance will bring showers and embedded
thunderstorms to the area tonight and more so on Sunday. Isolated
light showers in the morning will transition to thunderstorms
around 18Z or 19Z for all but KTPH, diminishing after 00Z or 01Z.
Typical thunderstorm concerns could occur including gusty winds,
brief heavy rain with VIS and ceiling reductions and small hail
in the strongest cells. Overall conditions improve Sunday night
into Monday as high pressure begins to build over the region.

&&

.FIRE WEATHER...Isolated to scattered afternoon and evening
showers and thunderstorms are expected today across all of
northern and most of central NV. Wettest storms will be over
northern FW Zones, with a mix of wet and dry storms over portions
of central NV. Warmer and drier conditions are expected across all
zones on Monday.

&&

.LKN WATCHES/WARNINGS/ADVISORIES...None.

&&

96/94/93/96
Hazardous weather outlook, Jul 4, 4:11 AM PDT, 10 hours 9 minutes before
Hazardous Weather Outlook
National Weather Service Elko NV
411 AM PDT Sun Jul 4 2021

NVZ030-031-033>041-050000-
Humboldt County-Northern Elko County-Southeastern Elko County-
Ruby Mountains and East Humboldt Range-White Pine County-
Northern Lander County and Northern Eureka County-
Southern Lander County and Southern Eureka County-
Southwest Elko County-South Central Elko County-
Northwestern Nye County-Northeastern Nye County-
411 AM PDT Sun Jul 4 2021

This hazardous weather outlook is for portions of eastern
Nevada...north central Nevada...northeast Nevada...northwest
Nevada and south central Nevada.

.DAY ONE...Today and Tonight.

Isolated to scattered showers and thunderstorms are expected
across much of northern and portions of central NV today, with
brief heavy rains and gusty winds possible.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Warmer and drier conditions are expected on Monday, and on
through most of next week as high pressure rebuilds over the
region. Record or near-record high temperatures are possible in
many locations beginning on Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotters are asked to report weather phenomena according to
standard operating procedure.

In the hours before

Special weather statement, Jul 4, 12:58 PM PDT, 1 hour 22 minutes before
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Special weather statement, Jul 4, 1:28 PM PDT, 52 minutes before
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Special weather statement, Jul 4, 1:40 PM PDT, 40 minutes before
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Special weather statement, Jul 4, 2:20 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
Jul 4, 12:45 PM PDTHeat AdvisoryLKNElko, Eureka, Humboldt, Lander, Nye8 days
Jul 4, 1:28 PM PDTSpecial Weather StatementLKN32 min
Jul 4, 1:40 PM PDTSpecial Weather StatementLKN50 min
Jul 4, 3:19 PM PDTSpecial Weather StatementLKN26 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.