Simulated Radar Next 48-hours into Saturday Evening 7 pm ET

Headlines Thursday Evening

• Powerful West Coast storm system battering California with rain/snow finally winding down Saturday

• Winter storm quickly tracks from Great Lakes on Friday —> arriving in Northeast including NYC by evening. Heavy snowfall to the north / freezing rain (ice) to the south of frontal boundary.

• Quite the parade of storm systems across the Northeast U.S.

ECMWF 18z Precipitable Water Next 6-days

1. Powerful Gulf of Alaska low pressure will direct plume of moisture into Alaskan panhandle as high pressure takes over California into the weekend

2. Friday storm system — part of a parade of low-pressure centers that rotate cyclonically around Quebec

Temperature Anomaly Next 6-days

ECMWF 18z Precipitation Type and Intensity | Next 6-days

Larger continental view —> main storm track remains across Southern Canada — more so like Clipper systems but they have moisture from the Pacific atmospheric rivers for some precipitation (snow) across the Great Lakes (+Lake Effect) and the Northeast this weekend … but that might not be as substantial as previous thought.

West Coast cyclone — Next 48-hours

Storm system makes landfall in North California while continuing to weaken

18z Analysis: West Coast cyclone — 982 mb within the upper-level low

Eastern U.S. Storm Systems | Friday into Saturday

Cold air behind this storm means any snow that fall should stick around all weekend, and melt later on Monday

Accumulated Snowfall by P-Type + Estimated Snowfall from SLR

All systems go for 6” to 8” of snowfall across New York City

Multiple Storm Systems next 6-days — but avoiding a major blizzard

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NWS Precipitation Next 72-hours

Accumulated Ice Next 3-days

NWS Snowfall Next 72-hours

Snowfall returns to Colorado including Denver. Hooray, Roger!

7.4 inches in NYC | Forecast remarkably steady since yesterday

RTMA | Current Temperature Analysis | 9:00 PM ET

Average Lower 48 temperature was 47.0°F with 50 million below freezing.

Temperature Anomaly | 9:00 PM ET

Lower 48 Temperature Anomaly was scorching 12.8°F ABOVE normal

Friday Morning Low Temperatures

93 million below freezing and a small area of subzero in New England

Friday High Temperatures

98 million at least 70°F —> nationwide average of 55°F.

ECMWF 12z EPS | Temperature Anomaly | Next 15-days

Alaska + Canadian Cold Pool drains ESE into the Midwest and Great Lakes next week and it seems the Lower 48 ridge will weaken — allowing a southward push of the “polar front”

Blend of Models | 7 Days Precipitation Total

Blend of Models | Total Snowfall Next 7-Days

ECMWF AIFS-Single 18z | Height Anomaly (500 hPa) Next 10-days

Major trough across Northeast for multiple days Wed-Friday of next week —> much colder air.

ECMWF 18z | Snowfall | Next 6-days | Lower 48 and Europe

ECMWF EPS 12z | Ensemble Median Snowfall Next 15-days

Probability of 6-inches or more Snowfall in the next 15-days

Temperature Anomaly | Next 15-days | ECMWF EPS 12z

5-Day Chunk #1 | Temperature Anomaly | Dec 25 - Dec 29

5-Day Chunk #2 | Temperature Anomaly | Dec 30 - Jan 3

5-Day Chunk #3 | Temperature Anomaly | Jan 4 - Jan 8

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