"By Friday the United Kingdom will be in an Arctic Maritime air mass with temperatures across the country staying in low single figures by day and below freezing by night". The rain is developing ahead of a very strong cold front. A small chance of showers is possible Tuesday, mainly along the beaches.
A warm start to the week will give way to cooler temperatures and a bit of rain in the New Orleans area, according to National Weather Service forecasters.
Thursday highs stay chilly in the upper 40s.
"Showers will regularly be turning to snow across the Scottish mountains on Thursday and then by Friday the air will be cold enough to see wintry showers at lower levels in the north and potentially to lower levels in the south as well".
Meanwhile, the National Weather Service early Saturday morning issued a winter weather advisory for the northern Oregon Cascades.
Tuesday: Occasional showers, with up to a half-inch possible.
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The Met Office says that cold arctic air is expected to spread south across all parts of England through Thursday. Friday will be mostly cloudy, with a high in the upper 30s and a Friday-night low in the mid 20s, the weather service said.
Between these two options, it's likely someone in Alabama gets a few snowflakes Friday.
Wednesday: Mostly sunny; high of 44. Rain chances will likely drop from near 20% Saturday to near 0% Sunday and early next week. This wave of cold will take our high temperatures down to the low-30s in Lower Michigan. Expect overnight lows around 57. Chance of precipitation is 70%. Sunday is looking to be similar to Saturday with a high near 55.
If you've got Christmas lights or any other outside holiday decorations, this weekend might be your best chance to get them up in comfortable weather.
The mild weather of the last few weeks will soon be a distant memory as the coldest air of the season invades most of the central and eastern U.S.