Two storm combo with big totals through 12/7

Tomer’s Take: A two-storm combo delivers feet of snow to many Western mountain zones through 12/7.

• A weak atmospheric river (AR) remains in my forecast for CA ‘s Sierra between 12/1-12/2.
• Storm #2 delivers a very weak AR on 12/3-12/4.
• Both storm systems drop heavy snow accumulation across the interior Rockies.

Current Setup

Infrared satellite shows storm #2 and storm #3 lined-up. The southern jet branch also gets involved in the AR.

Forecast Pattern through 12/7

Storm #1 hits the Sierra hard with a powerful N+S jet combo and weak atmospheric river (AR).

Forecast jet stream valid 12/1.

Forecast jet stream valid 12/7.

Forecast Timing

Forecast radar and satellite valid 11/30-12/5.

Forecast Totals

Storm #1 + Storm #2 grand total snow.

Forecast snow totals (inches) valid 11/30-12/7.

My forecast numbers for the Sierra might be a touch high but let’s see how much moisture gets blown in with this AR.

My forecast video 11/30: