RIO GRANDE VALLEY:
Today was a very gloomy day in the Rio Grande Valley, with overcast skies and drizzle. This is due to a surface trough of low pressure off the lower TX coast. My temperatures for Edinburg yesterday were off mainly because the winds were out of the northwest, which kept temperatures cooler than expected in the mid and upper Valley. The warm spot was in Brownsville, where it reached 63 degrees. Harlingen and McAllen hit 60 and 55, respectively. A gradual warm up is still in store, as promised. Tonight will be cool, with temperatures in the lower 40s in the upper Valley and lower 50s in the lower Valley. The rain/drizzle/fog will continue to be in the forecast for tonight and into the morning hours.
(1/15): An increased chance (50%) of showers and elevated storms for Saturday, and especially Saturday night, as a mid-level shortwave trough digs its way over the Rio Grande Valley. No risk of severe weather predicted by the Storm Prediction Center, but that does not mean that isolated severe storms won’t develop. Please be advised. Afternoon highs will be in the lower-to-mid 60s throughout the RGV. Saturday night will be cloudy with a 70% chance of rain and isolated storms. Winds will be out of the southeast at 5-10 mph, with higher gusts in storms. Lows will be in the mid 50s.
(1/16): Sunday will start off with rain and storms (40%). Precipitation should be exiting out of the region by afternoon hours. Highs will be in the upper 60s/lower 70s, with decreasing clouds by the evening. Winds will be out of the west then shifting out of the northwest at 5-10 mph. Sunday night will be partly cloudy with a 20% chance of showers. Lows will be in the lower 50s for much of the Valley.
M.L.K Day (1/17): Fair skies during Monday afternoon will keep temperatures mild for the day. Afternoon highs will reach the mid-to-upper 70s with winds out of the south at 5-10 mph. Monday night looks to be mostly clear to partly cloudy with lows in the upper 50s.
Edinburg 3-day Forecast:
(1/15): 61/46….Cloudy….60% chance of showers and isolated storms…70% chance during the evening…Winds out of the southeast at 10 mph.
(1/16): 71/55….Cloudy to partly cloudy…40% chance of rain in the morning/early afternoon, then clearing…Winds out of the west at 5-10 mph.
(1/17): 78/56…Mainly clear skies…south winds at 5-10 mph.
REST OF THE NATION:
There is a mid-level shortwave trough located over the New Mexico/Mexico border that is forecast to dig and affect South TX over the next day and a half. It will then lift and progress northward after passing through the area. This will spark showers and some thunderstorms for much of South TX aided by rich atmospheric moisture and sufficient lift in the region.
Snow is falling across WI and Northern IL due to a jet streak, located at 500mb, which is enhancing lift over the area. The left exit region of the jet streak creates divergence aloft, which lifts air at the surface and thus creates precipitation (snow). A surface low will form and move across the Great Lakes and into the northeastern states in the next couple of days. More snow is expected to drop in areas that already have feet of snow.
An upper-level ridge is causing small scale disturbances on the lee side of the Rockies. These disturbances, aided by rich Pacific moisture, are causing snow to fall in MT. More Pacific moisture is forecast to pound OR, WA, ID and MT over the next 2 or 3 days that could cause flooding and winter storm issues.
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