A historic winter weather week continues. Patchy freezing drizzle will redevelop late tonight and could cause some problems on roadways across our northern counties. Saturday afternoon and evening, additional light freezing rain and sleet may exacerbate these issues. 1/x
It only gets worse from there. Sunday evening, a wintry mix will develop, and as temperatures plummet a changeover to snow will occur with accumulations expected in many areas. 2/x
Travel Sunday night into Monday will be difficult if not impossible as winds increase and whip around the snow, reducing visibility. Additional power outages could be possible. 3/x
Bitter cold will then be ushered in, with lows Tuesday morning into the single digits in some locations and wind chills below zero. The ice and snow is unlikely to go anywhere Tuesday, and additional wintry weather could be possible on Tuesday night. 4/5
This will be the coldest airmass in south-central Texas since 1989. NOW IS THE TIME TO PREPARE! 5/5
Addendum: The sub-headline on our hazards graphic says "Today through this evening". That was an error. Winter Storm Warnings go into effect at 6am Saturday and continue through midday Monday.

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More from @NWSSanAntonio

15 Feb 20
We've been busy early in 2020 with upgrades to area radars, but there's another awesome new tool added this year that will improve our observations of the atmosphere: an Automated Radiosonde Observation System (AROS)! 1/5
Meteorologists at 92 locations in the US and its territories and many others worldwide have launched weather balloons twice a day, every day for many decades. Here's one example of how the process typically works, made a while back by @NWSTampaBay: 2/5
Recently, a system was developed that automates the process and can be controlled remotely. @NWSFairbanks shows one off here: . There is also some additional info here: bit.ly/2SOHgF4 3/5
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