While significantly cold air by mid fall standards remains absent throughout North America a slow moving wet storm intensifying near the East Coast (nor’easter) ensures a seasonably cold start to the coming week across the Northeast and mid Atlantic region (Oct 13 and 14) featuring below average daytime highs in the 50s. At the same […]
Cold weekend ahead in the Midwest but computer models are latching onto only brief near seasonal cooling in the South and East followed by fast return of above average warmth to predominate the rest of October and early November.
Winter-like cold air emanating from northern Canada is on the move through the northern Rockies and northern Plains, while weakening substantially as it spreads into the summer-like warm and humid air-mass lingering in the South and East. longer range models are latching onto another strong and extended cooling event across the eastern half of the […]
While significantly cold air by mid fall standards remains absent throughout North America a slow moving wet storm intensifying near the East Coast (nor’easter) ensures a seasonably cold start to the coming week across the Northeast and mid Atlantic region (Oct 13 and 14) featuring below average daytime highs in the 50s. At the same time mild overnight lows (7°-10° above average) will skew mean temperatures near seasonal levels before another lobe of a summerlike warm airmass entrenched in the central U.S. shifts into the East midweek. Amplified flow aloft featuring a reloading cool and wet Western trough and unseasonably hot and dry central U.S. ridge centered on Texas ensures a surge of modestly cold Canadian air will dive through Northeast by Wednesday , Oct 15 producing a brief 2-day period of slightly below average temperatures (both daytime highs and overnight lows). However, recent model consensus substantially backed off negative NAO intensity setting the stage for faster large scale flow de-amplification by next weekend (Oct 18-19) allowing seasonably warm air to settle back into the Northeast for several days to predominate week 2 (Oct 19-25). Significant pattern change next week also ensures moderation to summer-level heat entrenched in the central U.S. during t the 1st half of October, and notably drier and milder Western conditions closer to seasonal temperatures. Faster flow progression has latest extended range models deepening a somewhat cooler trough into the Eastern U.S. in late October (11-15 day period) at uncertain depth (strength), but better consensus in high latitudes prolongs absence of cold continental air transport into North America consistent with recent La Niña development. This adds confidence to a relatively mild initial half of November across the U.S. featuring predominance of near coast to coast above average temperatures, with main exception of portions of the Pacific Northwest and Southeast where periodic rainfall is considered most likely to limit temperatures closer to seasonal late fall levels.
