A major Arctic blast has swept through the Eastern U.S. through the Gulf of Mexico. We’ll see only slow moderation until Thursday. Meanwhile, a record strong “heat dome” builds over the Southwest and Western U.S. into this weekend.

Weather This Evening — cold front sweeping off the East Coast …

Heavy snowfall on the backside of the low pressure center moving through western PA and New York this evening. Gusty winds with thunderstorms along the secondary cold front.

HRRR next 18-horus —> Tuesday 1 PM ET shows rapid clearing into sunrise.

Lake Effect Snowfall machine turned back on across the Great Lakes in addition to system snow as blizzard moves into Canada

Blend of Models | Total Snowfall Next 7-Days

Blend of Models | 7 Days Precipitation Total

HRRR 18z — Radar Simulation Next 48-hours to Wednesday 2 PM ET

Next weather maker is a weak Clipper system into the Great Lakes late Tuesday.

NDFD NWS Total Precipitation Next 72-hours through Thu Evening

NWS Snowfall Next 72-hours — through Thursday Evening

RTMA Current Temperature Analysis | 9:15 PM ET

RTMA Current Temperature Anomaly Analysis | 9:15 PM ET

Lower 48 is -9.0°F below normal

RTMA Current Temperature 24-hour Change | 9:15 PM ET

Large area of more than 40°F colder temperatures from 24-hours prior in the Great Lakes, Ohio River Valley into the Southeast almost to the Gulf Coast, and back into South Texas.

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

Western U.S. | Heat Dome

Temperature Anomaly Next 6-days

Blend of Models Temperatures | Highs through Wednesday, March 25

Blend of Models Temperatures | Low through Wednesday, March 25

Freeze to the Gulf Coast on Tuesday and Wednesday

Next 6-days of Precipitable Water (my favorite parameter)

Tuesday Low Temperatures

183 million below freezing

Tuesday High Temperatures

Wednesday Low Temperatures

179 million still below freezing

Chicago next 7-Days

Washington D.C. next 7-days

Atlanta next 7-days

Phoenix next 7-days — 108°F — RECORD HOT peaks on Friday

°ECMWF AIFS 18z | Temperature at 500 mb | Next 10-days

Snowfall | Median of ECMWF Ensembles at 12z | Next 15-days

Probability of at least 3” of Snowfall Next 15-days

Temperature Anomaly | Next 15-days | ECMWF EPS 12z Ensemble Mean Flagship

Ridge —> A major heat dome develops across the Western U.S.

Trough —> Very cold air for mid-March blasts out of Canada into the eastern U.S.

Extreme cold over Alaska continues through Week 2

5-Day Chunk #1 | Temperature Anomaly | March 16 - March 20

5-Day Chunk #2 | Temperature Anomaly | March 21 - March 25

5-Day Chunk #3 | Temperature Anomaly | March 26 - March 30

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