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Heavy to Excessive Rainfall in the Central Appalachians; Severe Weather in the Mid-South; Hot Weather in Southern California

Heavy to excessive rainfall may lead to flooding today over southwest Pennsylvania into northern West Virginia, and western Maryland. Severe thunderstorms are possible this afternoon and evening in the Mid-South and across Eastern North Carolina. An extended period of hot weather is forecast for parts of coastal southern California including Los Angeles from today through Thursday. Read More >

Overview:

Between the afternoon hours of Friday, Jan. 11, 2019, and the morning of Saturday the 12th, a somewhat-stronger-than-first-expected low pressure system passed through the Central Plains, bringing widespread snow totals of 4-8" to primarily the southeastern one-third of the NWS Hastings coverage area (see map and list of totals below).  

Like many local snow events, but perhaps more so than usual, this one featured a very sharp divide between those places that received appreciable snowfall, and those that saw hardly anything. Roughly speaking, the true dividing line set up roughly along a line from York-Hastings-Beaver City. To the north of that line, most places saw hardly anything (including Grand Island and Kearney), while Hastings received only a light dusting. However, to the south of that line, snowfall totals quickly ramped up over just a 10-20 mile distance, with most places south of roughly a Geneva-Red Cloud-Phillipsburg KS line receiving at least 4-7", and isolated amounts to around 8". Fortunately, north winds were not overly-strong, with peak gusts only in the 25-30 MPH range, which along with the wet/heavy nature of the snow, kept heavy drifting to a relative minimum.

This was an interesting event from an NWS forecasting perspective, as unlike many heavier snow events that are "obvious" a week or more in advance, this one showed little sign of being an issue until about three days out. And then, once it finally became more obvious that measurable snow would occur, it first appeared that the highest snow totals would only reach the 2-5" range, and not the more widespread coverage of 5-8" that ultimately occurred. So why did this system come a bit "out of nowhere" and end up being stronger-than-expected? In short, what initially looked like two fairly weak, disorganized upper level disturbances ended up "phasing" into one noticeably stronger system as time went by.

NWS Radar loop from 5:45 AM on Jan. 11th - 2 PM on Jan. 12th.
The NWS Hastings coverage area is within the orange
outlined area labeled "GID" . Interstates are in red.
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