Nice Weekend Ahead as Rain/Snow Impact The Western U.S.

Rio Grande Valley:

Today, temperatures in McAllen reached 67 degrees as the afternoon high with wind generally out of the north.  Brownsville reached a high of 75 degrees with winds also out of the north.  The cold front that pushed through today has had an effect in the Lower Rio Grande Valley, with a temperature difference of close to 15 degrees in some areas of the Valley.  The National Weather Service in Brownsville has issued a Small Craft Advisory for the Lower Texas coastal waters from Baffin Bay to the mouth of the Rio Grande out to 60 NM.  This advisory has been issued until late tonight into early tomorrow morning because of strong winds.

(12/18): Saturday looks to be like a nice day if you like sunshine and cool temperatures.  Morning clouds will clear as the day progresses on.  Highs will be around mid-to-upper 60s with winds out of the north at 5-10 mph.  Tomorrow night looks to be clear with calm winds; lows will be in the upper 40s to lower 50s throughout the Valley.

(12/19): Sunday is generally the same as Saturday, with slightly warmer temperatures.  Highs will be in the lower-to-mid 70s with northerly winds at 5-10 mph. Sunday night will be mostly clear with lows in the mid-to-lower 50s for much of the Valley.

(12/20): For Monday, expect mostly sunny skies with noticeably milder conditions as winds will shift out of the south southeast, bringing in warmer air.  Highs will be in the upper 70s in the lower RGV and lower-to-mid 80s in the upper RGV.  Slight increase in humidity should also be expected.  Monday night, we’ll see partly cloudy skies with lows in the lower-to-mid 60s.

The Rio Grande Valley is now under a “Moderate Drought” :

Rest of the Nation:

There is a major low pressure system off the northern coast of California that is generating lots of rain for much of Northern California and Central California and even heavy snow in the Sierra Nevada Mountains.  This system is not expected to move much, and in fact, models have it circling around the Pacific Ocean, off the coasts of California, Oregon, and Washington for several days.  The counter clockwise flow around the low is pumping Pacific moisture into California, and will be continuing to do so for the next several days.  Flooding could be a major issue in areas that don’t see heavy snow, west of the Sierra Nevada Mountains.

There is a short wave trough located in Colorado that, with the help of moisture in the atmosphere and mesoscale effects, created snow in the Panhandle of Texas and western Oklahoma.  Light rain has been falling for much of the day in central and southern Oklahoma.

Areas of northern New York continue seeing Lake Effect Snow around Lake Erie and Lake Ontario.

Rain associated with a stationary front and low pressure is affecting North Florida.  There is question on whether this low will intensify, enter the Atlantic and form into a noreaster in the next few days.

21Z 12/17/2010 Surface Map and Radar

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About Brian

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