Rare Chilly Air for July Headed for Eastern US

Quite Unseasonable Temperatures For Next Week For Lower 48...

...Pattern Overview...

Forecast Predictability Seems Generally Above Average With The
Idea That An Anomalously High Amplitude Mid-Upper Level Trough And Well Organized Associated Surface System Overall Tracks Slowly
Eastward From The E-Central Us Into Mid-Late Week Downstream From A Nwrn Us Through Central Canadian Mid-Upper Level Ridge.

Emerging Trough Energies Approaching Mid-Late Week Into The Nwrn Us/Wrn Canada Will Lead To Less Amplified And Increasingly More Locally Uncertain Downstream Flow...Including Lead Impulses
Specifics Through The Rockies Into The S-Central Us.

...Sensible Weather Highlights...

The Rarity Of This Dry Canadian Airmass For July Just Might Result In Temperature Records (Low/Mins And Low/Maxes) For Many Areas Of The Eastern Half Of The Nation.

Meanwhile...High Temperature Readings Are Likely To Be 15f-20f Above Normal In The Pacific Northwest (Washington...Oregon...Idaho) Beneath An Upper-Level Ridge Of High Pressure Extending From The Continental Divide Westward To The Pacific And Gulf Of Alaska.

As The Upper-Level Ridge Migrates Slowly Northwestward...The Thermal Trough And Monsoonal Moisture Will Move With It...Bringing
Mid-Level Moisture And The Threat Of Some Convection To California
And The Cascades.

The Less Humid---Almost Autumn-Like Feel Of The Airmass From Canada--- Will Eventually Spread All The Way To The I-10 Corridor From West Texas Eastward Into Louisiana---And To The I-20 Corridor From Mississippi To Georgia And South Carolina. Here The High Temperatures Will Be Closer To 10-20f Below Normal.

During This Medium Range Period...Active Weather---From A
Precipitation Perspective---Will Be Concentrated Along The Northern And Central Divide Where Confluent Flow---A Mid-Level West To Northwesterly Wind---Will Be Carrying Residual Monsoonal Moisture And Convective Debris From The Mountains Into The High Plains.

Another Significant Focus For Showers And Thunderstorms Will Be Directed Along And Immediately Ahead Of The Day 3-5 Progression Of A Wavy Canadian Cold Front Through The Eastern Half Of The Nation...With An Enhanced Locally Heavy Rainfall Threat Emerging With The Stalling/Trailing End Of The Front Over The S-Central Us As Impulse Energy Meanders Over The Region Into Days 6/7.

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