A Cool Christmas In Store

Rio Grande Valley:

A very pleasant day in the Rio Grande Valley as temperatures reached the lower 80s with partly cloudy skies.  Winds were generally out of the southeast at 15-20 mph.  Currently, there is a stationary front just north of the Rio Grande Valley. This stationary front will begin moving back north as a warm front tomorrow and a cold front from the northwest will push through the RGV by early Christmas morning.  For tonight, partly cloudy skies with patchy fog will dominate the forecast.  Temperatures will be in the low 60s with winds out of the southeast at 10-15 mph.

Christmas Eve: Morning fog will be the main concern in the morning, Christmas eve, and will be lifting by 9 am.  Expect mostly sunny skies with afternoon highs in the low 80s/upper 70s.  Winds will be out of the southeast at 10-15 mph.  Friday evening will be mostly cloudy with temperatures dropping after midnight due to the front. There is a slight chance of rain (20%) as the front passes through.  Winds will be gusty out of the north with temperatures in the low 50s.

Christmas Day: Strong cold air advection (CAA) will set the stage for a brisk Christmas morning.  Temperatures will finally be closer to normal this time of year, with temperatures reaching the mid 60s in the afternoon.  Clouds will be decreasing as the afternoon approaches, leaving mostly clear skies.  Christmas evening will be clear, vulnerable to very chilly temperatures with lows in the upper 30 and mid 30s in some areas.

(12/26): Another cool day in store for Sunday.  Highs will be in the low-to-mid 60s with sunny skies.  Northeast winds will prevail at 5-10 mph.  Sunday night looks to be mostly clear with lows in the mid-to-lower 40s with calm to light winds.

Here is a look at the current fronts as of 7:32 CST:

Stationary front north of the RGV

Rest of the Nation:

An upper-level trough has moved over Colorado/New Mexico, producing upper level divergence and causing winter weather.  Winter weather warnings and advisories have been issued for both states.  This upper-level trough and a surface low will continue moving east and then south, bringing rain, thunderstorms, and snow for Kansas, Oklahoma, north Texas, and eventually Louisiana.

There is another upper-level low at 700mb over The Dakota’s, bringing snow to the north-central part of the United States.  A short-wave trough is visible at 500mb, enhancing lift over the area.  A vorticity max over the area is also enhancing the precipitation falling currently.  GFS model has this system pushing southeast and interacting with the other trough that will impact Oklahoma and north Texas tomorrow.  In the long run, computer models have these systems develop a major nor’easter by the 27th and 28th, impacting the New England and Northeastern United States.  More on this to come.

A jet streak, along with a surface low off the coast of Washington is bringing showers and snow in the state.  Showers and snow will continue affecting the northwest for the next few days.

700mb map. Yellow arrows indicate general wind flow direction.

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About Brian

University of Oklahoma graduate with a degree in Meteorology. Follow me on Twitter: @WeatherInformer
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