WEATHERAmerica Newsletter, Saturday, November 8, 2025; MEDIUM RANGE OUTLOOK

[Larry Cosgrove]

MEDIUM RANGE OUTLOOK

(Four To Ten Days From Now)

 

The (Modified) Cold Air Retreats Into Canada And The Northeast

ECMWF (4)

PivotalWeather.Com (4)

The coldest values cannot last long in a semizonal flow, and moderation and progression should eliminate the deep polar regime outside of the Northeast by next weekend. Air transport from Mexico might actually bring the 90 deg F isotherm as far north as Austin TX in this time frame. The mP air mass and vertical motion with orographic effects should make much of the West chilly, with snow spreading through the various ranges from the Pacific Northwest into California and then toward the American Rocky Mountains (ridging in Alberta and Saskatchewan may eliminate colder values to the right of the Canadian Rockies).

The Southern Branch (With Moisture) Shows Up

UQAM Meteocentre (4)

TrueWx.Com (4)

College Of DuPage Weather Laboratory (2)

The dry spell will come to an end, as the numerical models are indicating some type of split flow/southern branch scenario taking shape late in the medium range. The "particulars" still need to be specified, because the track location for a storm moving out of Baja California is still somewhat unclear. The early indications point toward a path through the Ohio Valley and lower Great Lakes; but climatology suggests closer to the Gulf and East Coasts. Snow levels should lower over the Intermountain Region, but general warming should eliminate snowfall risks to the right of the High Plains in the medium range.