12/20 – The Chief’s “Wet, Gloomy & Breezy” Tuesday Morning Forecast

The surface low-pressure south will approach the LA coast and ride along it as it progresses eastward. This brings a second round of showers, more to southern parts of the area, that will continue through this afternoon. This second round will have more instability to work with, so thunderstorms are likely to form right along the coast and in the nearshore Gulf waters. We could also see some heavy rainfall with these showers and storms, but it looks limited to coastal areas.

This afternoon and through Wednesday are expected to be mostly dry following the frontal boundary that passes. Some showers and thunderstorms are possible in the coastal waters Wednesday and lingering into Thursday, but onshore areas should remain dry. As we move into Thursday and Thursday night conditions will start to go downhill as our polar front approaches.

Thursday, all eyes will shift to the northwest as the highly advertised arctic front moving through the Great Plains. At the same time, a weak surface low in the Gulf will lift northward within the active southwesterly flow aloft just east of our region. The low, albeit weak may be just enough to cause a few scattered showers, especially over the eastern sections of the forecast area. A trailing cold front will swiftly move into the region late Thursday and early Friday…and we will know when it passes. A strong pressure gradient will cause winds to quickly increase with the frontal passage. For the frontal passage, a wind advisory will likely be needed at some point (so be sure to be ready to secure or bring in those holiday decorations).  Not to mention an immediate drop in temperatures. Another potential hazard which is the risk of exposure with wind chills dropping into the teens and perhaps single digits at times. A wind chill advisory may be needed for much of if not all of SE LA and S MS Friday, Friday Night and Saturday. Winds will remain elevated especially during the daytime hours Friday or Saturday if sky condition clear…more mixing could take place again keeping the need for a wind advisory. This of course would also start to impact travel with cross winds impacts a large portion of our local highways.

Going into the holiday weekend, winds will gradually decrease, especially going into Christmas Day. A gradual warming trends will begin at this time, but let’s focus on gradual because it will still be cold Christmas Day into the start of the new workweek on Monday.

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