Rio Grande Valley:
A very brisk Sunday for the RGV; temperatures didn’t get out of the 50s anywhere in the Valley. A high temperature of 58 was recorded in Brownsville, 57 in Harlingen, and 58 in McAllen. Morning lows hit 36, 33, and 34, respectively. Winds made it seem a bit cooler out of the north and northeast most of the day. Tonight, not as cold, but will still be quite chilly. Lows will be in the lower 40s towards the coast and in the upper 30s in the upper Valley, with partly cloudy skies.
(12/27): Monday will be a very nice day. Afternoon highs will be in the upper 60s/lower 70s under mostly sunny skies. Winds will be shifting out of the east southeast around 10 mph, bringing in lower level moisture and raising dewpoint temperatures. High pressure over Mississippi and Louisiana is one of the causes for the wind shift out of the southeast. There will be a chance (30%) of showers developing because of the lower level onshore flow from the Gulf of Mexico on Monday night into Tuesday. Lows will be in the mid-to-upper 50s with mostly cloudy to overcast skies.
(12/28): Expect a greater chance (40%) of showers on Tuesday. A shortwave trough in the mid atmosphere will help aid in the increase of showers. Highs will be the mid 70s. Low pressure in north Texas, along with high pressure in the Gulf will keep winds gusty on Tuesday around 15-20 mph, with gusts as high as 25 mph. Lingering showers will continue Tuesday night and will start to taper off as the night progresses. Lows will be in the lower 60s with mostly cloudy skies.
(12/29): Wednesday will start off cloudy, but clouds will slowly decrease as the afternoon approaches. Highs will be in the upper 70s and possibly lower 80s, with winds out of the south southeast at 10-15 mph. Wednesday night looks to be partly cloudy with lows in the lower 60s/upper 50s.
Rest of the Nation:
There is currently an upper-level ridge over a good portion of the mid-section of the United States. With this ridge comes sinking air, which kills any chance of precipitation.
There are a couple of areas of low pressure off the coast of British Columbia, Canada, bringing some Pacific moisture into Washington and Oregon and parts of northern California. These low pressures will continue bringing scattered showers and snow showers to the Pacific Northwest for the next 24 hours as another low pressure system looks to come on shore Monday night, increasing the chances of snow and rain for Oregon and Washington.
The main story tonight is the massive nor’easter impacting the New England states, as well as the entire northeast coast. Tremendous amounts of snow is currently falling in more than 8 states. The low is just south of Long Island, New York and is creating winds up to 50 mph in some places. Snowfall rates of 1 to 2 inches an hour are currently falling and up to 20 inches could accumulate by the end of tonight in some remote spots. This storm will be out of the CONUS by late Monday night/early Tuesday morning.