#6190 Postby srainhoutx » Mon Feb 25, 2019 8:45 am
Monday morning weather briefing from Jeff:
Active weather pattern will continue this week with several chances of rainfall and potential for a fairly significant cold front next weekend.
Southwesterly flow aloft doing its thing this morning with clouds and moisture starting to increase over the surface cold dome…sound familiar? Radar shows some showers over the Gulf waters likely being forced by a passing weak disturbance which none of the forecast models showed. A few of the models are trying to generate a few light showers this afternoon along the coast as moisture increases.
Better rain chances come tonight into Tuesday as a warm front moves toward the area from the south and lift increases ahead of a short wave in the sub-tropical SW flow aloft. Cloud decks will lower and thicken this evening and expected drizzle and light rain to begin to develop by mid evening and expand in coverage and intensity into Tuesday. Instability increases some on Tuesday above the surface and a few elevated thunderstorms may develop. SPC has outlooked a good part of the area for a “marginal” risk of severe weather and think a few of the stronger thunderstorms could produce some large hail. Rainfall amounts of .25-.75 of an inch look likely late today-early Wednesday.
Surface warm front lifts northward on Tuesday night with the area becoming warm sectored. This will result in showers and thunderstorms gradually ending and shifting NE of the area although I would not rule out a few showers moving S to N in the warm air advection regime on Wednesday. Other item of concern will be our coastal TX “friend” the sea fog as warm 60 degree dewpoints move over near 60 degree water temperatures. Dense sea fog bank will likely develop late Tuesday and linger into Thursday across the coastal locations.
Some of the models are attempting to move a cold front into the area on Thursday as a very cold air mass moves into the plains. The NAM model which did exceedingly well the weekend of the 16th with a shallow dense cold air mass is showing this front pushing into and across the area on Thursday while the other global models keep the front stalled to our north. This will have big ramifications on the temperature forecast for Thursday and Friday as we could approach 80 if the front does not come through or have highs in the 50’s and 60’s if it does move through. I am leaning toward the NAM solution since it tends to handle these dense, shallow, cold air masses better than the global models, but would like to see a few more runs before having much confidence.
Regardless of what happens Thursday and Friday, a significant cold front will move across the region on Saturday. A strong arctic air mass will plunge down the plains and across TX on Saturday allowing very cold conditions for early March. Front should clear the coast on Saturday with temperatures falling into the 50’s and maybe even the 40’s during the day under strong cold air advection. Strong lift begins to develop behind the front as the SW flow aloft overruns the boundary and expect widespread rains to develop Sunday-Tuesday. Will have to keep a close eye on surface temperatures during this period as some areas could get close to freezing for morning lows.
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