The National Weather Service (NWS) can send warnings for inclement and dangerous weather, such as flash floods, destructive severe thunderstorms, tornadoes, and snow squalls, directly to your cell phone by using the Wireless Emergency Alert (WEA) system. Still, new criteria from the NWS has changed how many snow squall alerts are being sent to people’s phones.
“A snow squall is an intense but brief period of heavy snow, often accompanied by gusty winds,” said AccuWeather Senior On-Air Meteorologist Geoff Cornish. “It can be extremely dangerous, especially for highway drivers, because these quick-hitting storms can cause sudden whiteouts and flash freezes.”
While snow squall forecasting isn’t new, the warning system is. The NWS adopted suggestions from AccuWeather and implemented a warning system for snow squalls in 2018. Since then, phone alerts have been warning residents when dangerous snow squalls are imminent in order to alert the public of the potential for extremely hazardous travel conditions.
“I liken it to actually driving with a pillowcase over your head,” Warning Coordination Meteorologist at NWS Boulder Greg Heavener told KUSA in an interview. “I mean, it can literally be zero visibility where you can’t see the hood of your car just a few feet in front of your face. That’s how significant these snow squalls can be.”
Until this year, all snow squall warnings triggered a WEA notification, alerting residents of the impending squall, no matter the time of day. But, according to public feedback, the NWS issued too many warnings, especially during the overnight hours.
To reduce the number of warnings and make people more aware of the severe nature of the snow squalls, the NWS created new criteria the warning must meet to send out a WEA notification. As of November 7, snow squall warnings will only trigger a phone alert when considered “significant.”
A general snow squall will slicken roads and reduce visibility, but other factors, such as location and time of day, will impact if the warning meets the “significant” criteria.
“Mostly, that has to do with the timing and location of the snow squall,” Heavener said. “If a squall is headed towards a major roadway during the hours of 6 a.m. to 10 p.m., there’s a good chance our meteorologists will add a ‘significant’ tag to the warning and a wireless emergency alert will get sent out.”
A snow squall warning will only be issued when the squall develops during a winter weather advisory or if there are no other winter alerts in place. Snow squall warnings do not get issued when a winter storm warning or a blizzard warning is already in place since the wording of those warnings already details the threats such as zero visibility and flash freezes on the roadways.
Experts say that when a snow squall warning alert comes through the WEA system, it’s crucial to know what to do. Just like having a safe place to go during a tornado or severe thunderstorm, knowing where to go and what to do if you are caught on the roads during a snow squall is essential.
“Annual highway fatalities from [snow squall] events can exceed fatalities due to tornadoes in many years,” the NWS said in the alert’s initial service description document. “The Polygon-based Snow Squall Warning will provide critical, life-saving information for these short-term, highly localized, extremely hazardous events to our partners in a manner that will allow them to recognize and parse the products to make them available to their customers.”
In the situation that a driver is caught in a snow squall while driving, AccuWeather Senior Meteorologist Alex Sosnowski says the best defense is to “wait it out” by exiting the highway or taking secondary roads where driving at a slower speed is safer. The problem on interstates, he said, is the pressure drivers feel to drive at a high speed no matter the weather conditions.
If you’d still like to receive all snow squall warnings on your cell phone, even those that don’t trigger a WEA, it is necessary to download a weather app, such as the free AccuWeather app.