1:00 PM (Thurs) | *An extended stretch of mild weather in the eastern half of the nation…late night/early morning fog will be prevalent…colder weather pattern out west*
Paul Dorian
Much warmer-than-normal conditions will be widespread in the US during the next five days. Map courtesy NOAA, tropicaltidbits.com
Overview
An extended stretch of mild weather has begun in the eastern half of the nation as strong high pressure ridging dominates at all levels of the atmosphere. Given the time of year with increasingly long nights, this mild weather pattern will be quite conducive to the formation of late night and early morning fog. At the same time, much of the western US experiences will experience colder-than-normal conditions in coming days with upper-level low pressure in control.
Much warmer-than-normal conditions will continue in the eastern US during days 6-10 (Nov 10-Nov 15) while it remains colder-than-normal out west. Map courtesy NOAA, tropicaltidbits.com
Details
The month of November has started off colder-than-normal in the Mid-Atlantic region (e.g., -3.1 degrees at PHL, -3.5 degrees at DCA) and much of the eastern US, but that is about to change in a dramatic way. High pressure has strengthened in the upper part of the atmosphere over the Great Lakes and this is a key player in the development of milder weather after the cold start to the month. In fact, this high pressure system will dominate the scene in the eastern US for the next ten days or so leading to an extended stretch of warmer-than-normal weather. To make it even more enjoyable in the east, much of the time will be rain-free over the next several days. The next chance for decent rainfall may not come until the middle of next week.
High pressure ridging dominates the scene aloft across the northeastern quadrant of the nation in the current five day period. Map courtesy NOAA, tropicaltidbits.com
While it looks quite mild and rain-free in the eastern US, this same weather pattern will be quite conducive to the formation of late night/early morning fog. The nights are increasingly long as we progress through the month of November and the air still contains enough moisture for condensation to take place in the late night and early morning hours. Once there is some daytime heating, patchy early morning fog will tend to fade away under mostly sunny skies.
High pressure ridging will continue to dominate the scene aloft in the eastern states during days 6-10 (Nov 10-Nov 15). Map courtesy NOAA, tropicaltidbits.com
In the western US, upper-level low pressure will dominate the scene over the next several days and much of the area will experience colder-than-normal conditions. In addition to the cold, snow will become an increasing factor in coming days from the Northern Rockies (e.g., Montana) to eastern California’s Sierra Nevada Mountains. The good news here is that a colder weather pattern out west with mountain snows and coastal rains will reduce the wildfire risk during the next week or two.
Meteorologist Paul Dorian
Perspecta, Inc.
perspectaweather.com
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