Flash flooding and a severe weather threat are on the table today as a powerful storm system slides from the Southwest US to the south-central states. Ingredients are coming together around here for heavy rain and possible severe thunderstorm activity including a low-level flow of very moist and mild air from the Gulf of Mexico ahead of the intensifying surface low pressure. This low will strengthen as it pushes northward later today from the south-central US towards the Great Lakes. On Friday, the primary (initial) low will grind to a halt over the Great Lakes and transfer its energy to a secondary low likely to form just off the northern Mid-Atlantic coastline. The weather calms down here by tomorrow night and this weekend looks decent as high pressure edges into the SE US.
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Strong low pressure now over the western US will impact much of the nation in coming days with significant snows, flooding rains, damaging ice, and even a severe weather outbreak. Heavy snow continues to fall today in the higher elevations of California’s Sierra Nevada Mountains and will intensify over the Rocky Mountains States from later today into Thursday. By later tomorrow, the strong surface low will slide into the south-central US and ingredients will likely come together for a severe weather outbreak across the Mississippi and Tennessee Valleys from late tomorrow into Friday. After that, this major storm system will push towards the Great Lakes on Friday, grind to a halt as it becomes influenced by intensifying high-latitude blocking and transfer its energy to a secondary low pressure system that will form off the northern Mid-Atlantic coastline. The result will be a significant snow event late in the week across parts of the Upper Midwest and Northeast US and ice can become a serious issue as well in some sections.
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It’ll become much more unsettled in the Tennessee valley later tonight and the unstable atmosphere will stick around into early Friday as a powerful storm pushes into the south-central part of the nation. This storm will then turn northward towards the Great Lakes and for much of its trek, we’ll be in the warm sector with humid air flowing northward from the Gulf of Mexico. With these ingredients coming together, the threat for severe thunderstorms will increase around here later tonight and stick around through late tomorrow night. The passage of the next cool front will usher in cooler air to the Tennessee Valley for the upcoming weekend.
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As one storm begins to exit off the Northeast US coastline, another one is already impacting northern California with rain in the lower elevations and snows in the mountains. This system will become a major storm and impact much of the nation in coming days with significant snow, ice and rain all the way from California-to-New England. There is also the threat of a severe weather outbreak later in the week across the Lower Mississippi and Tennessee Valleys.
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Yesterday was quite windy across the area, but today will be quite pleasant with warm conditions and only light winds as high pressure pushes in this direction. It’ll become more unsettled and remain warm at mid-week with an increasing chance of showers and thunderstorms ahead of the next frontal system. The passage of the next cool front will usher in cooler air to the Tennessee Valley at week’s end.
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An unsettled start to the week in the Tennessee Valley as a deep upper-level trough will shift eastward from the Southern Plains to the Mississippi Valley before lifting northeastward to the Ohio Valley. This system will swing a cold front through northern Alabama and showers are a threat in addition to some strong wind gusts of over 40 mph. Tuesday is likely to be quite a pleasantly mild day with less wind in the Tennessee Valley following the passage of the frontal system.
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Yesterday was unusually warm in norther Alabama with temperatures reaching the 80’s, but the end of the work week will feature cooler conditions following the passage of a cold front. The overall pattern remains unsettled with a chance of showers during each of the next few days.
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The country is sharply divided today in terms of temperatures with record-breaking warmth in the East and bitter cold in much of the western half of the nation. In addition to the cold, accumulating snow is falling in a swath from the Upper Midwest to northern New England from a storm system that has impacted a large part of the nation in recent days. Snow is also falling across many western states and blizzard warnings have been posted in of all places the southern part of California. In fact, for the first time ever, blizzard warnings have been issued by the San Diego office of NOAA’s National Weather Service for the San Bernardino Mountains.
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It’ll be unseasonably warm around here for the next couple of days with highs near the 80 degree mark. The overall pattern remains unsettled with a chance of showers during each of the next few days. Cooler air will return to the Tennessee Valley region by week’s end with afternoon highs on Friday likely confined to the middle 50’s.
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It’ll be quite mild around here for the next few days with highs this afternoon well up in the 60’s and then upper 70’s are likely on Wednesday and perhaps the lower 80’s on Thursday. The pattern remains unsettled with a good chance of showers and thunderstorms each of the next few days. Colder air will return to the Tennessee Valley region by week’s end.
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