A lake effect snow warning is in effect for Jefferson, Lewis, and Oswego counties until 1am Thursday.A lake effect snow advisory is in effect for northern Oneida and northern Herkimer counties through tonight.A lake effect snow warning and advisory means that significant snow is likely in localized areas within the warned and advised area with heavier snow in the warned area. A large difference in snowfall is likely even within the warned area.In this particular lake effect event, here is what we are watching:While the entire area should have scattered snow showers and flurries, the most consistent and heavier lake effect snow will occur through tonight across portions of Oswego, Lewis, and Jefferson counties. However, other sections of northern Oneida and northern Herkimer counties will get some occasional lake snow. Some enhanced snow showers will also occur south of Syracuse off of Lake Erie.The heaviest snow of 6-12" through tonight appears most likely to happen over northern Oswego, southern Jefferson and portions of Lewis counties. Surrounding that area expect 3-6" and 1-3". This should all be north of Oneida Lake and well north of Syracuse. To the south, 1-3" of snow appears likely through tonight from roughly the Route 20 corridor southbound to about the Route 79 & 206 corridors. Elsewhere in the immediate CNY area of the Route 5, Thruway and Route 31 corridors, I am expecting up to 1" of snow or so.If your area has a lake effect warning or advisory, here is what you should do:-- In lake effect snow squalls, the weather can vary from locally heavy snow in narrow bands to clear skies just a few miles away.-- If you will be traveling across the region be prepared for rapid changes in road and visibility conditions.-- Know which county you live in, and where you are in relation to these heavy snow squalls.-- If you need to travel, be prepared for very difficult driving conditions inside the bands of heavier snow and where the snow squalls have already been.-- Have a winter storm kit ready in your car in case you are stranded.-- Keep an eye on Interactive Doppler and Triple Doppler radars on CNYcentral.com.-- Keep your phone with your CNYcentral mobile app turned on so if warnings are issued you will know.-- Periodically check NBC-3, CBS-5 and CW-6 for updates on the weather and possible issuance of lake effect snow warnings and advisories.-- Know which county you live in, and where you are in relation to these heavy snow squalls.-- If you need to travel, be prepared for very difficult driving conditions inside the bands of heavier snow and where the snow squalls have already been.-- Have a winter storm kit ready in your car in case you are stranded.Stay updated with this storm with these links: -- Interactive Doppler Radar :-- Triple Doppler Radar : -- Lightning Strikes-- Watches/Warnings: (Make sure to hit the 'F5' key to refresh the page.)-- Follow CNY Central Meteorologists on Twitter : If you see a severe weather, damaging winds, hail, or flooding, please let us know on Facebook or by e-mail at firstname.lastname@example.org or email@example.com . Here is detailed information on this warning from the National Weather Service: OSWEGO-JEFFERSON-LEWIS-INCLUDING THE CITIES OF...OSWEGO...WATERTOWN...LOWVILLE335 PM EST WED DEC 18 2013 ...LAKE EFFECT SNOW WARNING REMAINS IN EFFECT UNTIL 1 AM ESTTHURSDAY... * LOCATIONS...OSWEGO...JEFFERSON AND LEWIS COUNTIES...MAINLY ACROSS THE TUG HILL REGION. * TIMING...THROUGH OVERNIGHT TONIGHT. * ACCUMULATIONS...ANOTHER 3 TO 6 INCHES TONIGHT...LEADING TO SNOWFALL TOTALS OF 8 TO 14 INCHES IN THE MOST PERSISTENT LAKE SNOWS. * VISIBILITIES...DOWN TO ONE QUARTER MILE. * IMPACTS...TRAVEL WILL BE DIFFICULT AT TIMES WITH SNOW COVERED ROADS AND POOR VISIBILITY. THIS INCLUDES INTERSTATE 81 FROM PARISH TO ADAMS. NORTHERN ONEIDA-INCLUDING THE CITY OF...BOONVILLE259 PM EST WED DEC 18 2013 ...LAKE EFFECT SNOW ADVISORY REMAINS IN EFFECT UNTIL 1 AM ESTTHURSDAY... * LOCATIONS...NORTHERN ONEIDA COUNTY. * HAZARDS...SNOW. * ACCUMULATIONS...3 TO 5 INCHES OF SNOW ESPECIALLY UP NEAR THE LEWIS COUNTY LINE. * TIMING...PERIODS OF SNOW CONTINUING INTO THIS EVENING. THE CHANCE OF SNOW WILL END BY AROUND MIDNIGHT. * TEMPERATURES...IN THE MID 20S. * WINDS...WEST 5 TO 10 MPH WITH GUSTS UP TO 20 MPH. * IMPACTS...TRAVEL WILL BE HAZARDOUS WITH SNOW COVERED ROADS AND POOR VISIBILITY.