The storm could be historic in some areas for its March intensity, while unleashing heavy snow, tornadoes and flooding, and drawing record warmth northward. Here are five things to know about the ongoing system.
The entire Sierra Nevada is running far ahead of average for season-to-date snowfall; the southern Sierra Nevada is at 224 percent of what’s “normal” at this point in the season, whereas the central and northern Sierra are between 150 and 200The snow, while relentless, is a precious resource for California’s scant water supply.
Meanwhile, the storm will encounter cold air in the southern Rockies, Upper Midwest, Great Lakes and interior Northeast. It is probable that a swath of snow, perhaps heavy, will affect the region, mainly through Thursday in the Rockies and Friday into Saturday farther east.Flooding will be of significant concern north of a stalled frontal boundary draped west to east from near the Oklahoma Red River to Nashville. Moisture wafting in from the south will ride up and over a lip of cooler air.
By Thursday, a few more records are likely across southern Mississippi, Louisiana and Alabama, as well as in Florida. The Sunshine State’s spate of exceptional warmth should continue into Saturday.5) The storm could set records for low pressure over the Mid-South Air pressure may sound like an abstract concept, but it’s quite simple — it is basically the weight of the air on top of you. High pressure systems bring sinking air, which squashes cloud cover. Lows, on the other hand, feature rising air that helps build clouds and generate precipitation. Generally, the lower the pressure, the stronger the storm.
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