US Short Range Weather to Dec 26

...One More Day Of Unsettled Weather Over The West Coast Before
Conditions Begin To Improve...

...A Rare White Christmas Is Possible Across Oklahoma Into

...An Arctic Air Mass Will Continue To Keep Temperatures Cold In
The North-Central Conus...

Another Upper Trough Has Begun Sliding Onshore Into The Western
U.S. Fueling A Further Round Of Precipitation Over Northern
California. The System Advancing Inland Will Remain Rather
Progressive Which Should Bring Improving Conditions To The West
Coast By Monday Morning As An Upper Ridge Builds Overhead. Until
Then...Expect Moderate To Heavy Precipitation Across Northern/ Central California With The Activity Shifting Southward Throughout The Remainder Of The Day. The Air Mass In Place Will Be Cold Enough To Support Snowfall Over The Higher Elevations Of The
Sierra Nevada Range With Another 12 To 18 Inches Possible.

Although The Best Low-Level Moisture Will Focus Its Sights On The
Golden State...Much Of The Remainder Of The West Will Also Get In
On The Action. Upslope Flow Combined With Energetics With The
Trough Energy Pushing Inland Will Help Produce Over A Foot Of Snow
Across Much Of The West With The Cascades Possibly Seeing Closer To Two Feet.

By Monday Night...As This Same System Dives Southeastward Toward The Southern High Plains...It Will Begin To Intercept An
Increasingly Moist Air Mass Courtesy Of The Gulf Of Mexico. Strong
Frontal Lift Should Help Focus An Axis Of Heavier Convection
Across Texas And Into The Lower Mississippi Valley. The Strong
Dynamics Associated With This Upper Trough Combined With Ample
Moisture And Instability May Lead To Areas Of Severe Thunderstorms.

This Threat Should Begin Christmas Morning Across Southeast Texas And Shift Eastward In Time.

The Other Aspect Of This Storm Will Be The Wintry Weather Possible On The Northern Extent Of The Precipitation Shield. Modified Arctic Air Nosing Southward Will Allow Temperatures To Be Cold Enough To Support Snow With This System. So Chances Are Decent A Rare White Christmas Will Take Place Across Oklahoma And Into Arkansas. The Current Hpc Winter Weather Desk Forecast Suggests Up To 6 Inches Of Snow May Be Possible.

A Weak Disturbance Tracking From The Lower Tennessee Valley Up
Toward The Northeastern U.S. Should Bring A Light To Moderate Axis
Of Precipitation To This Region. As The System Gains Latitude... Enough Cold Air Will Be Present To Produce Light Snowfall Accumulations With Patches Of Freezing Rain Across Northern Pennsylvania...New York...And The Lower Half Of New England.

Lastly...The Arctic Ridge Of High Pressure Impacting The Center Of
The Country Will Bring Rather Cold Temperatures To The
North-Central States. In Fact...Current Forecasts Suggest Negative
Teens Will Be Commonplace Overnight On Christmas Eve While
Readings Only Rebound To Near 0 Degrees On Christmas Day.

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