textproduct: Reno

KEY MESSAGES

* Cold overnight lows with dry weather continues with potential for freezing fog in the Sierra again tonight.

* Quiet weather with morning inversions leading to air stagnation is expected this week over western NV valleys.

* Another series of winter storms arrives as early as New Years Day, continuing through weekend.

DISCUSSION

This morning will be the coldest morning of the week with many lows in the single digits across the Sierra and upper teens for valley locations. Light winds will allow valley inversions to set up each morning through at least Wednesday. Additionally, freezing fog will likely set up each night for fog-prone Sierra locations, continuing through daybreak.

Today will initiate a warming trend, though, with afternoon high temperatures back to near normal by Wednesday (upper 40s for much of the area). Ridge winds may remain gusty this week, but only receive an uptick after the calendar turns to 2026. Two incoming storm systems are on the horizon this week, with the first bringing impacts as early as the afternoon of New Years Day.

This first low pressure system is currently spinning off the coast of Baja California and, depending on the trajectory, could bring rain showers into parts of W NV overnight Wednesday through Thursday. Because this system is of a southern origin, snow levels will be much higher, above 9 kft at the storm's onset late Wednesday night. They're forecasted to drop steadily to around 8 kft by Thursday night. However, due to the nature of this small- scale feature, it's a bit harder to iron out the details on snowfall and liquid totals at this point in time. With high snow levels, there may be renewed hydrology concerns, especially along the Susan River, as there's been recent flooding and soils are saturated.

The second system comes in on the heels of that Baja low, bringing increased winds Friday and through the weekend. This second system is also colder, with snow levels between 5-6 kft. There's still plenty of model uncertainty on the placement and timing of this system so stay tuned for more details as we get closer.

-Giralte

AVIATION

VFR conditions prevail for much of the region through Wednesday with light winds. The only exception will be FZFG for Sierra valleys, likely until 18Z this morning, especially for KTRK. FZFG is expected to renew again tonight, around or after 06Z. Additionally, morning valley inversions may produce slantwise visibility concerns, primarily for Sierra Front terminals.

-Giralte

REV Watches/Warnings/Advisories

NV...None. CA...None.