868 FXUS65 KLKN 090756 AFDLKNArea Forecast Discussion National Weather Service Elko NV 1256 AM PDT Tue Sep 9 2025
.KEY MESSAGES...
Updated at 1206 AM PDT Tue Sep 9 2025
* Dry conditions through Tuesday afternoon as upper ridge builds over the Four Corners, keeping drier SW flow aloft over Nevada.
* Tuesday evening a strong upper trough with Pacific moisture will push in from the NW bringing a return of showers and thunderstorms, as well as cooler temperatures through Saturday.
* After a brief break Sunday another strong Pacific trough looks to move into Nevada Monday of next week.
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.DISCUSSION... (Today through next Tuesday)
WEATHER PATTERN OVERVIEW: A pair of weather making troughs will impact the region over the new 7 days. An upper level trough currently to the northwest of the area just off the CA/OR coast will encroach on NV this week creating southwesterly flow over the state. The pressure gradient will tighten as the LPC pushes closer to the area increasing wind speeds Tuesday and Wednesday. The system carries enough Pacific moisture with it to increase PW values over western NV to a range of 0.7-0.8 inches by Wednesday morning. Shower activity will initiate mainly over Humboldt County where the best chances of wetting rain are possible. Storm total QPF has a range of 0.1-0.4 inches of wetting rain mainly north of I-80 with the first system. As the LPC moves through the CWA convective chances increase Wednesday and Thursday afternoons thanks to increased forcing associated with the system. GFS frontogenesis guidance suggest heavier rainfall amounts possible in a corridor that encompasses northern Lander, northern Eureka, and western Elko Counties Wednesday evening.
Temperatures behind the associated boundary pushing through the state early Thursday will fall back into the 60s and 70s for highs before a slight rebound under a brief ridge Saturday and Sunday. On Sunday a shortwave trough will eject from its parent trough to the northwest into the Great Basin. A similar setup to the first system unfolds over the area Sunday into Monday as moisture again increases from west to east. The best chances for rainfall again will take place over the northern half of the state where best forcing and moisture availability reside. This second system moves fairly quickly through the area and places the region under a post frontal regime by next Tuesday. Beyond Tuesday, a break from active weather is possible as the storm track across the western CONUS shifts to the north slightly.
FORECAST CONFIDENCE & DEVIATIONS: No major changes to grids as NBM actually is handling the incoming systems well.
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.AVIATION...VFR conditions are expected through Tuesday evening as no precipitation is forecast. Southwesterly afternoon wind gusts on Tuesday at terminals KTPH and KELY will range 20-24KTs before diminishing Tuesday evening around sunset.
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.FIRE WEATHER...Quiet weather continues through Tuesday ahead of incoming system set to impact the region Wednesday through Friday. Stronger southwest winds are expected Tuesday and Wednesday afternoon over fire weather zones 425 and 426 where sustained winds of 15-20 mph and gusts near 30 mph are possible. Afternoon RH values however are borderline or above for fire weather criteria.
The incoming system will spread shower and storm activity initially across fire weather zones 424 and 437. Initial storm activity may be of the dry variety before sufficient moisture associated with the system brings more wetting rains to the region. Areal coverage of shower and storm activity will expand to all fire weather zones through the week.
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.LKN Watches/Warnings/Advisories... None. &&
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DISCUSSION...99 AVIATION...99 FIRE WEATHER...99
NWS LKN Office Area Forecast Discussion