Forecast By SnowBrains Meteorologist – Eric McNamee
2:35 PM MST, 5/19/2021
A trough moving through California the next few days will bring 2-6″ of snow to the Sierra by Saturday.
Precipitation will begin tomorrow and continue through Friday.
By Friday and Saturday, precipitation will become more spotty as the trough moves into the Great Basin.
Conditions will then dry out heading into next week and through the extended.
The open resort that looks to see the most snow is Mammoth.
A trough currently over the PNW will dig into California and bring 2-6″ of snow to the Sierra through Saturday.
Precipitaion will start in the northern part of the state later in the morning Thursday and fill in during the afternoon.
This will occur again on Friday but further south over the central Sierra.
By Saturday, most precipitation will be over the Great Basin as the trough moves slowly to the east.
Winter Weather Advisories have been issued across the region.
Anomalously cold closed mid/upper low drops south into NorCal tonight and Thursday, and then hangs out to our east over the Great Basin on Friday and Saturday. The result will be an increasing chance of showers over mainly the mountains beginning tonight across the north, then spreading south through the northern Sierra on Thursday. Shower chances will continue Friday and Saturday. A few thunderstorms will also be possible, mainly in the afternoons and early evenings. Several inches of snow will be possible above 3500-4000 feet in the northern mountains, and above 5000 feet across the northern Sierra (SREF and GEFS plumes indicate potential for 1-2 inches of accumulation at KBLU). Recent warm temperatures will likely limit accumulations on road surfaces, but there will be a chance for some travel impacts near the higher northern Sierra passes later Thursday and Thursday evening if stronger convective showers develop. The winter weather advisory has been extended further south to include the crest of the northern Sierra thru Thursday evening. -NWS Sacramento 5/19/2021
Getting into Sunday, all snow will end as the trough moves off to the wast.
This trough will be replaced with high pressure and result in clearer & warm conditions.
Tuesday and Beyond:
Global ensembles are indicating a generally dry pattern in the extended period of the forecast, with cooler temperatures as well.