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Alake effect snow warning is a bulletin issued by theNational Weather Service in theUnited States to warn of heavy snowfall accumulations that are imminent from convective snow generated by very cold airmass passing over unfrozen lakes (lake effect snow). The criteria for amounts may vary significantly over different county warning areas.[1] On October 2, 2017, someNational Weather Service Forecast Offices discontinued issuing the Lake Effect Snow Warning, and consolidated it with theWinter Storm Warning.[2] On October 15, 2018, the National Weather Service discontinued issuing Lake Effect Snow Warnings nationwide all together, and all offices consolidated it with the Winter Storm Warning.[3] Lake effect snow warnings were reinstated for the 2019–20 winter season.[4]
Environment Canada'sMeteorological Service of Canada issues similar warnings but they are calledsnowsquall warnings.
879 WWUS41 KBUF 171935WSWBUFURGENT - WINTER WEATHER MESSAGENational Weather Service Buffalo NY235 PM EST Tue Dec 17 2019NYZ006-180345-/O.NEW.KBUF.LE.W.0001.191218T1400Z-191219T0000Z/Oswego-Including the city of Oswego235 PM EST Tue Dec 17 2019...LAKE EFFECT SNOW WARNING IN EFFECT FROM 9 AM TO 7 PM ESTWEDNESDAY...* WHAT...Heavy lake effect snow expected. Total snow accumulations of 6 to 10 inches in the most persistent lake snows. Winds gusting as high as 35 mph will produce blowing and drifting snow. Snowfall rates may briefly reach 2 to 4 inches per hour.* WHERE...Oswego county. Greatest accumulations across the Tug Hill Plateau, with much lower amounts across lower elevations.* WHEN...From 9 AM to 7 PM EST Wednesday.* IMPACTS...Travel will be very difficult with deep snow cover on roads and very poor visibility. The hazardous conditions could impact the evening commute.PRECAUTIONARY/PREPAREDNESS ACTIONS...Heavy snow will fall in relatively narrow bands. If traveling, beprepared for rapidly changing road conditions and visibilities.Submit snow reports through our website or social media.&&Experimental content below...do not use operationallyPlease see below links for more information on this experimenthttp://www.weather.gov/buf/polygon_pddhttp://www.nws.noaa.gov/os/notification/pns15lake_effect_snowaaa.htmTo view the experimental polygons please see:http://www.weather.gov/buf/lespolygonCOORD...4408 7515 4417 7534 4406 7579 4391 7615 4383 7623 4348 7623 4346 7561 4353 7548 4371 7531 4373 7513 TIME Y19M12D18T1400Z-Y19M12D18T2000ZCOORD...4340 7586 4346 7581 4352 7644 4347 7659 4339 7661 4330 7645 4328 7645 4326 7622 4328 7620 4322 7587 TIME Y19M12D18T2000Z-Y19M12D19T0000Z&&$$Hitchcock