Alert archive / New York / Lake Effect Snow Warnings in 2021

Lake Effect Snow Warning 2, NWS Binghamton, NY

February 19, 2021Cayuga County, Onondaga County, New York

NWS Binghamton, NY issued this lake effect snow warning at Feb 19, 2021, 2:43 PM EST for Cayuga County, Onondaga County, New York. It took effect at Feb 19, 2021, 6:00 PM EST. It was in force for 30 hr. 10 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Feb 19, 2021, 2:43 PM EST (19:43 UTC)
In effect from
Feb 19, 2021, 6:00 PM EST
Expired
Feb 21, 2021, 12:00 AM EST
In force
30 hr
Issued by
NWS Binghamton, NY

Counties Cayuga County, NY, Onondaga County, NY

The radar

The Binghamton radar (KBGM), 96 km from the middle of the area, began a volume at 19:45 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Feb 20, 9:37 AM ESTSNOW 2.8Jamesville, NY
Feb 20, 12:58 PM ESTHEAVY SNOW 12 Sw Tully, NYCORRECTS PREVIOUS HEAVY SNOW REPORT FROM 2 SW TULLY. SNOW SQUALL. CRASH REPORTED ON NY 511 SITE AT 12:58. SNOWFALL ESTIMATED FROM NYSM TULLY SITE.
Feb 20, 12:58 PM ESTHEAVY SNOW 12 Sw Tully, NYCRASH REPORTED ON NY 511 SITE AT 12:58. SNOWFALL ESTIMATED FROM NYSM TULLY SITE.
Feb 20, 1:01 PM ESTSNOW 3.7Syracuse, NY
Feb 20, 1:27 PM ESTHEAVY SNOW 21 Nw Tully, NYCAR ACCIDENT REPORTED ON NY 511 AT 1:27 PM. SNOWFALL ESTIMATED FROM NYSM TULLY SITE.
Feb 20, 1:27 PM ESTHEAVY SNOW 21 Nw Tully, NYCORRECTS PREVIOUS HEAVY SNOW REPORT FROM 1 NW TULLY. SNOW SQUALL. CAR ACCIDENT REPORTED ON NY 511 AT 1:27 PM. SNOWFALL ESTIMATED FROM NYSM TULLY SITE.
Feb 20, 2:00 PM ESTHEAVY SNOW 7.5Tully, NYTWITTER PHOTO PASSED LONG TO US, DEPTH ESTIMATED FROM PHOTO.
Feb 20, 3:00 PM ESTSNOW 5Fabius, NY
Feb 20, 3:00 PM ESTHEAVY SNOW 10Otisco, NY
Feb 20, 4:04 PM ESTSNOW 54 Ene Niles, NY

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 7.7 hours before the alert went out and 189 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Buffalo Intl Airport, NY at 12:00Z on 2021-02-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Buffalo Intl Airport, NY at 12:00Z on 2021-02-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 square meters per square second.1939587897117136156175Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
567 m above ground
0-6 km bulk shear
72 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
131 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

772 
WWUS41 KBGM 191943
WSWBGM

URGENT - WINTER WEATHER MESSAGE
National Weather Service Binghamton NY
243 PM EST Fri Feb 19 2021

NYZ062-PAZ040-048-072-192045-
/O.CAN.KBGM.WW.Y.0014.000000T0000Z-210219T2300Z/
Sullivan-Northern Wayne-Pike-Southern Wayne-
Including the cities of Monticello, Damascus, Equinunk, Milford, 
and Honesdale
243 PM EST Fri Feb 19 2021

...WINTER WEATHER ADVISORY IS CANCELLED...

Snow is rapidly diminishing, with very little if any additional
accumulation expected.

$$

NYZ017-018-201945-
/O.UPG.KBGM.WS.A.0005.210219T2300Z-210221T0000Z/
/O.NEW.KBGM.LE.W.0002.210219T2300Z-210220T2300Z/
Southern Cayuga-Onondaga-
Including the cities of Auburn and Syracuse
243 PM EST Fri Feb 19 2021

...LAKE EFFECT SNOW WARNING IN EFFECT FROM 6 PM THIS EVENING TO
6 PM EST SATURDAY...

* WHAT...Heavy lake effect snow expected. Total snow accumulations
  of 5 to 9 inches in the primary lake effect band, with 2 to 4
  inches elsewhere.

* WHERE...Southern Cayuga and Onondaga counties.

* WHEN...From 6 PM this evening to 6 PM EST Saturday. Lake effect
  snow heaviest late tonight through Saturday, reaching an inch
  per hour snowfall rates at times.

* IMPACTS...Plan on slippery road conditions with dangerously 
  low visibilities in heavier lake effect snow bands.

* ADDITIONAL DETAILS...The heaviest lake effect snow amounts are
  expected from Central to Southeastern Cayuga County, into
  Southwestern Onondaga County. This includes Auburn, Sempronius,
  Owasco, and Moravia in Cayuga County. This includes Jordan, 
  Marcellus, Skaneateles, Otisco, and Tully in Onondaga County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

Experimental content below...do not use operationally
Please see below links for more information on this experiment
http://www.weather.gov/buf/polygon_pdd
http://www.nws.noaa.gov/os/notification/
pns15lake_effect_snowaaa.htm
To view the experimental polygons please see:
http://www.weather.gov/buf/lespolygon 
COORD...4293 7622 4297 7639 4315 7648 4302 7650 4303 7680 4297 
7678 4291 7664 4279 7652 4273 7623 4277 7616 
TIME Y21M02D19T2300Z-Y21M02D20T1200Z 
COORD...4297 7615 4311 7648 4302 7650 4303 7680 4300 7693 4291 
7664 4276 7648 4272 7608 4277 7595 4284 7594 
TIME Y21M02D20T1200Z-Y21M02D20T2300Z

$$

NYZ016-201945-
/O.UPG.KBGM.WS.A.0005.210219T2300Z-210221T0000Z/
/O.NEW.KBGM.WW.Y.0015.210219T2300Z-210220T2300Z/
Seneca-
Including the city of Seneca Falls
243 PM EST Fri Feb 19 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO
6 PM EST SATURDAY...

* WHAT...Lake effect snow expected. Total snow accumulations of 3
  to 7 inches in the main lake effect band with 1 to 2 inches
  elsewhere.

* WHERE...Seneca county. Heaviest snow amounts will be in far
  northern portions of the county.

* WHEN...From 6 PM this evening to 6 PM EST Saturday. Lake effect
  snow heaviest late tonight through Saturday, reaching a half
  inch to inch per hour snowfall rates at times.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...The heaviest lake effect snow amounts are
  expected in far northern Seneca County. This includes from
  Waterloo and Seneca Falls northward, especially towards Tyre,
  Dublin, and Montezuma.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

NYZ044-201945-
/O.NEW.KBGM.WW.Y.0015.210219T2300Z-210220T2300Z/
Cortland-
Including the city of Cortland
243 PM EST Fri Feb 19 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO
6 PM EST SATURDAY...

* WHAT...Lake effect snow expected. Total snow accumulations of 4
  to 7 inches in the main lake effect band with 2 to 3 inches 
  elsewhere.

* WHERE...Cortland county. Heaviest snow amounts will be in
  northern portions of the county.

* WHEN...From 6 PM this evening to 6 PM EST Saturday. Lake effect
  snow heaviest late tonight through Saturday, reaching a half
  inch to inch per hour snowfall rates at times.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...The heaviest lake effect snow amounts are
  expected in northern Cortland County. This includes Homer, Scott,
  Preble, Truxton, and Keeney.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$
6 follow-up statements
587 
WWUS41 KBGM 200414
WSWBGM

URGENT - WINTER WEATHER MESSAGE
National Weather Service Binghamton NY
1114 PM EST Fri Feb 19 2021

NYZ017-018-202300-
/O.CON.KBGM.LE.W.0002.000000T0000Z-210220T2300Z/
Southern Cayuga-Onondaga-
Including the cities of Auburn and Syracuse
1114 PM EST Fri Feb 19 2021

...LAKE EFFECT SNOW WARNING REMAINS IN EFFECT UNTIL 6 PM EST
SATURDAY...

* WHAT...Heavy lake effect snow expected. Total snow 
  accumulations of 5 to 9 inches in the primary lake effect 
  band, with 2 to 4 inches elsewhere.

* WHERE...Southern Cayuga and Onondaga counties.

* WHEN...Ongoing and through 6 PM EST Saturday. Lake effect snow
  heaviest late Friday night through Saturday, reaching an inch 
  per hour snowfall rates at times.

* IMPACTS...Plan on slippery road conditions with dangerously 
  low visibilities in heavier lake effect snow bands.

* ADDITIONAL DETAILS...The heaviest lake effect snow amounts are 
  expected from Central to Southeastern Cayuga County, into 
  Southwestern Onondaga County. This includes Auburn, 
  Sempronius, Owasco, and Moravia in Cayuga County. This 
  includes Jordan, Marcellus, Skaneateles, Otisco, and Tully in 
  Onondaga County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

Experimental content below...do not use operationally
Please see below links for more information on this experiment
http://www.weather.gov/buf/polygon_pdd
http://www.nws.noaa.gov/os/notification/
pns15lake_effect_snowaaa.htm
To view the experimental polygons please see:
http://www.weather.gov/buf/lespolygon
COORD...4293 7622 4297 7639 4315 7648 4302 7650 
        4303 7680 4297 7678 4291 7664 4279 7652 4273 7623 
        4277 7616 
TIME Y21M02D19T2300Z-Y21M02D20T1200Z
COORD...4297 7615 4311 7648 4302 7650 4303 7695 
        4298 7695 4275 7661 4266 7636 4260 7595 4263 7589 
        4284 7594 
TIME Y21M02D20T1200Z-Y21M02D20T2300Z

$$

NYZ016-044-202300-
/O.CON.KBGM.WW.Y.0015.000000T0000Z-210220T2300Z/
Seneca-Cortland-
Including the cities of Seneca Falls and Cortland
1114 PM EST Fri Feb 19 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM EST
SATURDAY...

* WHAT...Lake effect snow expected. Total snow accumulations of 
  3 to 7 inches in the main lake effect band with 1 to 2 inches 
  elsewhere.

* WHERE...Seneca county. Heaviest snow amounts will be in far 
  northern portions of the county.

* WHEN...Ongoing and through 6 PM EST Saturday. Lake effect snow
  heaviest late Friday night through Saturday, reaching a half 
  inch to inch per hour snowfall rates at times.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...The heaviest lake effect snow amounts are 
  expected in far northern Seneca County. This includes from 
  Waterloo and Seneca Falls northward, especially towards Tyre, 
  Dublin, and Montezuma.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$
319 
WWUS41 KBGM 200817
WSWBGM

URGENT - WINTER WEATHER MESSAGE
National Weather Service Binghamton NY
317 AM EST Sat Feb 20 2021

NYZ017-018-202300-
/O.CON.KBGM.LE.W.0002.000000T0000Z-210220T2300Z/
Southern Cayuga-Onondaga-
Including the cities of Auburn and Syracuse
317 AM EST Sat Feb 20 2021

...LAKE EFFECT SNOW WARNING REMAINS IN EFFECT UNTIL 6 PM EST THIS
EVENING...

* WHAT...Heavy lake effect snow expected. Total snow 
  accumulations of 5 to 9 inches in the primary lake effect 
  band, with 2 to 4 inches elsewhere.

* WHERE...Southern Cayuga and Onondaga counties.

* WHEN...Ongoing and through 6 PM EST Saturday. Lake effect snow 
  heaviest late Friday night through Saturday, reaching an inch 
  per hour snowfall rates at times.

* IMPACTS...Plan on slippery road conditions with dangerously 
  low visibilities in heavier lake effect snow bands.

* ADDITIONAL DETAILS...The heaviest lake effect snow amounts are 
  expected from Central to Southeastern Cayuga County, into 
  Southwestern Onondaga County. This includes Auburn, 
  Sempronius, Owasco, and Moravia in Cayuga County. This 
  includes Jordan, Marcellus, Skaneateles, Otisco, and Tully in 
  Onondaga County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

Experimental content below...do not use operationally
Please see below links for more information on this experiment
http://www.weather.gov/buf/polygon_pdd
http://www.nws.noaa.gov/os/notification/
pns15lake_effect_snowaaa.htm
To view the experimental polygons please see:
http://www.weather.gov/buf/lespolygon
COORD...4293 7622 4297 7639 4315 7648 4302 7650 
        4303 7680 4297 7678 4291 7664 4279 7652 4273 7623 
        4277 7616 
TIME Y21M02D19T2300Z-Y21M02D20T1200Z
COORD...4297 7615 4311 7648 4302 7650 4303 7695 
        4298 7695 4275 7661 4266 7636 4260 7595 4263 7589 
        4284 7594 
TIME Y21M02D20T1200Z-Y21M02D20T2300Z

$$

NYZ016-044-202300-
/O.CON.KBGM.WW.Y.0015.000000T0000Z-210220T2300Z/
Seneca-Cortland-
Including the cities of Seneca Falls and Cortland
317 AM EST Sat Feb 20 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM EST THIS
EVENING...

* WHAT...Lake effect snow expected. Total snow accumulations of 3
  to 7 inches in the main lake effect band with 1 to 3 inches 
  elsewhere.

* WHERE...Seneca county. Heaviest snow amounts will be in far 
  northern portions of the county.

* WHEN...Ongoing and through 6 PM EST Saturday. Lake effect snow 
  heaviest late Friday night through Saturday, reaching a half 
  inch to inch per hour snowfall rates at times.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...The heaviest lake effect snow amounts are 
  expected in far northern Seneca County. This includes from 
  Waterloo and Seneca Falls northward, especially towards Tyre, 
  Dublin, and Montezuma.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$
239 
WWUS41 KBGM 201452
WSWBGM

URGENT - WINTER WEATHER MESSAGE
National Weather Service Binghamton NY
952 AM EST Sat Feb 20 2021

NYZ017-018-210500-
/O.EXT.KBGM.LE.W.0002.000000T0000Z-210221T0500Z/
Southern Cayuga-Onondaga-
Including the cities of Auburn and Syracuse
952 AM EST Sat Feb 20 2021

...LAKE EFFECT SNOW WARNING NOW IN EFFECT UNTIL MIDNIGHT EST
TONIGHT...

* WHAT...Heavy lake effect snow. Additional snow accumulations of
  3 to 7 inches. Including what has already fallen, some locations
  may exceed 10 inches total.

* WHERE...Onondaga and Southern Cayuga counties.

* WHEN...Until midnight EST tonight.

* IMPACTS...Plan on slippery road conditions. Snowfall rates of up
  to an inch per hour at times with visibility of a quarter mile
  and gusts to 25 mph.

* ADDITIONAL DETAILS...The heaviest lake effect snow amounts are
  expected from southern Cayuga County, into western and southern
  Onondaga County. This includes Auburn, Sempronius, Owasco, and 
  Moravia in Cayuga County. This includes Jordan, Marcellus, 
  Skaneateles, Otisco, and Tully in Onondaga County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

Experimental content below...do not use operationally
Please see below links for more information on this experiment
http://www.weather.gov/buf/polygon_pdd
http://www.nws.noaa.gov/os/notification/
pns15lake_effect_snowaaa.htm
To view the experimental polygons please see:
http://www.weather.gov/buf/lespolygon
COORD...4302 7623 4311 7648 4302 7650 4303 7695 
        4298 7695 4284 7663 4278 7664 4261 7648 4265 7625 
        4281 7609 
TIME Y21M02D20T1400Z-Y21M02D20T2100Z
COORD...4298 7630 4307 7631 4318 7647 4302 7650 
        4300 7672 4294 7658 4288 7659 4278 7643 4276 7625 
        4283 7612 
TIME Y21M02D20T2100Z-Y21M02D21T0500Z

$$

NYZ025-045-210500-
/O.EXB.KBGM.WW.Y.0015.000000T0000Z-210221T0500Z/
Tompkins-Chenango-
Including the cities of Ithaca and Norwich
952 AM EST Sat Feb 20 2021

...WINTER WEATHER ADVISORY IN EFFECT UNTIL MIDNIGHT EST TONIGHT...

* WHAT...Lake effect snow. Additional snow accumulations of 2 to 5 
  inches.

* WHERE...Tompkins and Chenango counties.

* WHEN...Until midnight EST tonight.

* IMPACTS...Plan on slippery road conditions. Snow squalls at
  times with visibility of quarter mile and gusts to 25 mph.

* ADDITIONAL DETAILS...The heaviest snow amounts are expected in
  western portions of Chenango County, and northeastern portions
  of Tompkins County. This includes Otselic, McDonough, Smithville
  Flats, and Greene in Chenango County. This includes Groton and
  Dryden in Tompkins County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

NYZ016-044-210500-
/O.EXT.KBGM.WW.Y.0015.000000T0000Z-210221T0500Z/
Seneca-Cortland-
Including the cities of Seneca Falls and Cortland
952 AM EST Sat Feb 20 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL MIDNIGHT EST
TONIGHT...

* WHAT...Lake effect snow. Additional snow accumulations of 2 to 5
  inches. Including what has already fallen, some locations may
  exceed 7 inches total.

* WHERE...Cortland and Seneca counties.

* WHEN...Until midnight EST tonight.

* IMPACTS...Plan on slippery road conditions. Snow squalls at
  times with visibility of quarter mile and gusts to 25 mph.

* ADDITIONAL DETAILS...The heaviest lake effect snow amounts are
  expected in northern portions of Seneca and Cortland counties.
  In Seneca County, this includes from Waterloo and Seneca Falls
  northward, especially towards Tyre, Dublin, and Montezuma. In
  Cortland County, this includes Cortland, Homer, Truxton, Scott,
  and Preble.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$
365 
WWUS41 KBGM 202036
WSWBGM

URGENT - WINTER WEATHER MESSAGE
National Weather Service Binghamton NY
336 PM EST Sat Feb 20 2021

NYZ017-018-210500-
/O.CON.KBGM.LE.W.0002.000000T0000Z-210221T0500Z/
Southern Cayuga-Onondaga-
Including the cities of Auburn and Syracuse
336 PM EST Sat Feb 20 2021

...LAKE EFFECT SNOW WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EST
TONIGHT...

* WHAT...Heavy lake effect snow. Additional snow accumulations of
  2 to 5 inches.

* WHERE...Onondaga and Southern Cayuga counties.

* WHEN...Until midnight EST tonight.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...The heaviest lake effect snow amounts will
  be in southern Cayuga County, into western and southern Onondaga
  County. This includes Auburn, Sempronius, Owasco, and Moravia in
  Cayuga County. This includes Jordan, Marcellus, Skaneateles,
  Otisco, and Tully in Onondaga County. Including what already
  fell earlier, some spots will end up with around a foot of snow. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

Experimental content below...do not use operationally
Please see below links for more information on this experiment
http://www.weather.gov/buf/polygon_pdd
http://www.nws.noaa.gov/os/notification/
pns15lake_effect_snowaaa.htm
To view the experimental polygons please see:
http://www.weather.gov/buf/lespolygon
COORD...4298 7623 4309 7648 4302 7650 4303 7680 
        4299 7684 4289 7668 4277 7661 4265 7642 4260 7622 
        4276 7602 
TIME Y21M02D20T2000Z-Y21M02D21T0000Z
COORD...4309 7625 4318 7631 4322 7647 4302 7650 
        4302 7670 4296 7669 4287 7653 4281 7609 4282 7597 
        4288 7590 
TIME Y21M02D21T0000Z-Y21M02D21T0500Z

$$

NYZ016-025-044-045-210500-
/O.CON.KBGM.WW.Y.0015.000000T0000Z-210221T0500Z/
Seneca-Tompkins-Cortland-Chenango-
Including the cities of Seneca Falls, Ithaca, Cortland, 
and Norwich
336 PM EST Sat Feb 20 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT EST
TONIGHT...

* WHAT...Lake effect snow. Additional snow accumulations of 1 to 
  3 inches.

* WHERE...Chenango, Cortland, Tompkins and Seneca counties.

* WHEN...Until midnight EST tonight.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...The heaviest snow amounts will be in
  northern portions of Seneca County, northwestern Tompkins
  County, much of Cortland County, and western to southern
  Chenango County. Including what already fell earlier, this will
  bring some spots between 5 to 8 inches for a total.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$
025 
WWUS41 KBGM 210157
WSWBGM

URGENT - WINTER WEATHER MESSAGE
National Weather Service Binghamton NY
857 PM EST Sat Feb 20 2021

NYZ017-018-210500-
/O.CON.KBGM.LE.W.0002.000000T0000Z-210221T0500Z/
Southern Cayuga-Onondaga-
Including the cities of Auburn and Syracuse
857 PM EST Sat Feb 20 2021

...LAKE EFFECT SNOW WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EST
TONIGHT...

* WHAT...Heavy lake effect snow. Additional snow accumulations of
  up to 2 inches.

* WHERE...Onondaga and Southern Cayuga counties.

* WHEN...Until midnight EST tonight.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Lake effect snow less organized and more
  showery in nature this evening. Including what fell earlier,
  some spots will end up with near a foot of snow. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

Experimental content below...do not use operationally
Please see below links for more information on this experiment
http://www.weather.gov/buf/polygon_pdd
http://www.nws.noaa.gov/os/notification/
pns15lake_effect_snowaaa.htm
To view the experimental polygons please see:
http://www.weather.gov/buf/lespolygon
COORD...4300 7603 4311 7625 4322 7647 4302 7650 
        4302 7670 4296 7669 4287 7653 4281 7609 4282 7597 
        4290 7593 
TIME Y21M02D21T0000Z-Y21M02D21T0500Z

$$

NYZ016-025-044-045-210500-
/O.CON.KBGM.WW.Y.0015.000000T0000Z-210221T0500Z/
Seneca-Tompkins-Cortland-Chenango-
Including the cities of Seneca Falls, Ithaca, Cortland, 
and Norwich
857 PM EST Sat Feb 20 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT EST
TONIGHT...

* WHAT...Lake effect snow. Additional snow accumulations of up to
  2 inches.

* WHERE...Chenango, Cortland, Tompkins and Seneca counties.

* WHEN...Until midnight EST tonight.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Snow has become more showery this evening
  and should taper off through the overnight hours. Including what
  has already fallen, snow totals will range from 5 to 8 inches.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$
429 
WWUS41 KBGM 210502
WSWBGM

URGENT - WINTER WEATHER MESSAGE
National Weather Service Binghamton NY
1202 AM EST Sun Feb 21 2021

NYZ017-018-210615-
/O.EXP.KBGM.LE.W.0002.000000T0000Z-210221T0500Z/
Southern Cayuga-Onondaga-
Including the cities of Auburn and Syracuse
1202 AM EST Sun Feb 21 2021

...LAKE EFFECT SNOW WARNING HAS EXPIRED...

Snow showers will linger for a few more hours overnight with an
additional dusting to an inch of snow possible in some areas. 

$$

NYZ016-025-044-045-210615-
/O.EXP.KBGM.WW.Y.0015.000000T0000Z-210221T0500Z/
Seneca-Tompkins-Cortland-Chenango-
Including the cities of Seneca Falls, Ithaca, Cortland, 
and Norwich
1202 AM EST Sun Feb 21 2021

...WINTER WEATHER ADVISORY HAS EXPIRED...

Snow showers will linger for a few more hours overnight with an
additional dusting to an inch of snow possible in some areas. 

$$

Kistner

What forecasters said that day

The local office's own words before this lake effect snow warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Binghamton, NY wrote its last area forecast discussion before this lake effect snow warning went out at Feb 19, 12:58 PM EST, 1 hour 45 minutes earlier.

Area forecast discussion, Feb 19, 12:58 PM EST, 1 hour 45 minutes before
Area Forecast Discussion
National Weather Service Binghamton NY
1258 PM EST Fri Feb 19 2021

.SYNOPSIS...
Behind an exiting system, lake effect snow is expected tonight
through Saturday night, with accumulations concentrated towards
the eastern Finger Lakes and higher terrain south of Syracuse.
At least scattered snow showers and flurries can be expected
elsewhere, including possible brief squalls. After high pressure
provides a break Sunday, another system comes by Monday.

&&

.NEAR TERM /THROUGH SATURDAY/...
905 AM Update...
Back end of synoptic snow is still making its way through the
area. Once that finishes, and as we get into peak daylight hours
which will promote more melting on roadways, we anticipate
being able to drop the Winter Weather Advisories ahead of their
currently scheduled expiration times. For now they remain in
place. We have received numerous 2-5 inch reports throughout
the advisory area; even 4-6 inches or so in Susquehanna-Pike-
Wayne-Luzerne.

Decisions on lake effect will be made today; impressions for now
are that confidence in localized amounts of 7 inches or more,
has increased for at least portions of Cayuga-Onondaga. Also, it
has been noted especially via the Canadian-regional model, that
there may be significant inland extent with the bands as we head
into Saturday, courtesy of upstream Lake Huron-to-Lake Ontario
connections, and favorable thermal profiles/instability in the
dendritic growth layer. This could take accumulating lake effect
right down into the Catskills NY-Far northeast corner of PA.
Even outside of primary lake effect, there appears to be some
potential for snow squall clusters for much of the area. We will
continue to assess that today.

Previous discussion...
Steady accumulating snow is over the advisory area but still
mostly light. It could become a little heavier this morning. The
snow is ahead of a surface front with lift from a short wave
and jet at upper levels. Additional snow amounts of 1 to 3
inches. The snow will end from west to east from late morning
into the afternoon. It will end before the advisory expires.
Winds will continue to be light but will shift from east to west
today. High temperatures will be in the low and mid 30s with
the warmest areas from Elmira to Wilkes-Barre where the snow
ends first.

This evening lake effect snow gets started across our northern
counties. The low level flow starts off at 280 putting the snow
into Oneida but shifts to 310 during the overnight, but then
stays there through Saturday. The RGEM is the most aggressive
putting a band of moderate snow into Cayuga and Onondaga
Counties. The instability looks best during the day Saturday.
Other CAMs are not as bullish. The dendrite zone is around 5k
feet and in the saturated layer.

A winter storm watch is currently out for this area for tonight
into Saturday evening. This will continue given the uncertainty
and the best snow starting late tonight. The potential is still
there for 8 to 10 inches of snow in localized areas of southern
Cayuga and western Onondaga Counties. Lake snow showers could
extend well into NEPA and the Catskills Saturday. An advisory
may be needed for lake effect snow one county downwind of the
current watch.

Lows tonight will be back in the teens with highs Saturday in
the mid and upper 20s. With a decent pressure gradient surface
winds will be northwest at 10 to 20 mph with higher gusts on
Saturday.

&&

.SHORT TERM /SATURDAY NIGHT THROUGH SUNDAY NIGHT/...
420 AM Update...
Lake effect snow will linger through the first half of Saturday
night. However, high pressure building in from the west should
bring enough dry air into the region to cut off the snow showers
by early Sunday morning. Sunday is shaping up to be a decent
one, with sunshine and temperatures climbing to near freezing as
the ridge crests overhead. However, the high will slide off the
East Coast on Saturday night and our next system will be on its
heels heading across the Great Lakes. The timing of the
precipitation ahead of this next system should mostly hold off
until Monday, but it is possible that some light WAA snowfall
begins across our western forecast area before sunrise on
Monday.

&&

.LONG TERM /MONDAY THROUGH THURSDAY/...
430 PM Update...
Latest model guidance are mostly in agreement with low pressure
tracking across Southern Ontario Canada on Monday and dragging
a cold front through the region. Fairly confident with high
precipitation chances for Monday with good agreement among the
models with the timing of the front. However, P-types are still
uncertain at this time, but forecast soundings are favoring
mostly snow everywhere early in the day, with possibly a
transition to light rain, especially across the southern
forecast area and in valley locations, as temperatures warm to
above freezing during the day Monday.

Behind the cold front, there is not going to be strong CAA, but
there may still be some lake response and some possible snow
showers along the NY Thruway corridor Monday night with
generally a west to east fetch off the lakes. For the remainder
of the week, the pattern is forecast to be mostly zonal with
several weak perturbations pushing across the region through the
week with snow/rain chances. Still quite a bit of timing
differences with these weak waves, so decided to just go with a
blend of model/ensemble guidance, which gives a low chance for
precipitation through the remainder of the week with the highest
chances coming on Thursday.

&&

.AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
With a system pulling out of the area this afternoon, visibility
restrictions will generally leave with it even as MVFR ceilings
persist; in some cases fuel alternate required. Colder air
moving in tonight through midday Saturday will get lake effect
snow showers going southeast of Lake Ontario. While a brief
snow shower cannot totally be ruled out late today-early
evening as a front passes, the main lake effect
concerns/associated visibility restrictions are anticipated for
KSYR late evening, shifting towards KITH early Saturday. During
the day, scattered lake effect snow showers and even isolated
brief snow squalls will become possible, especially in
afternoon. KSYR-KITH-KBGM will be the more vulnerable terminals.
For winds, light southwest this afternoon will veer west-
northwest behind the front tonight, increasing to around 10
knots with gusts 15-20 knots by late Saturday morning.

Outlook...

Saturday afternoon through Saturday night...Occasional
restrictions at NY terminals from lake effect snow showers,
especially KSYR-KITH-KBGM. Mainly VFR at AVP.

Sunday through Sunday evening...Mainly VFR.

Late Sunday night through Tuesday evening...A couple of systems
will likely bring light snow/rain and associated restrictions.

Late Tuesday night through Wednesday...Mainly VFR.

&&

.BGM WATCHES/WARNINGS/ADVISORIES...
PA...Winter Weather Advisory until 6 PM EST this evening for PAZ040-
     048-072.
NY...Winter Weather Advisory until 6 PM EST this evening for NYZ062.
     Winter Storm Watch from 6 PM EST this evening through Saturday
     evening for NYZ016>018.

&&

SYNOPSIS...MDP
NEAR TERM...MDP/TAC
SHORT TERM...MPK
LONG TERM...MPK
AVIATION...MDP
Hazardous weather outlook, Feb 19, 11:58 AM EST, 2 hours 45 minutes before
Hazardous Weather Outlook
National Weather Service Binghamton NY
1158 AM EST Fri Feb 19 2021

NYZ062-PAZ040-048-072-201700-
Sullivan-Northern Wayne-Pike-Southern Wayne-
1158 AM EST Fri Feb 19 2021

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM EST THIS EVENING...

This Hazardous Weather Outlook is for central New York and
northeast Pennsylvania.

.DAY ONE...This afternoon and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Winter Weather Advisory.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures. Please relay
any information about severe weather to the NWS while following
local, state and CDC guidelines.

NYZ009-024-037-PAZ038-043-044-047-201700-
Northern Oneida-Chemung-Southern Oneida-Bradford-Wyoming-Lackawanna-
Luzerne-
1158 AM EST Fri Feb 19 2021

This Hazardous Weather Outlook is for central New York and
northeast Pennsylvania.

.DAY ONE...This afternoon and tonight.

Hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Scattered snow squalls will be possible Saturday, with brief low
visibilities and slick roads, even with light accumulations. Be
prepared for rapid changes in conditions.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

NYZ015-022-023-025-036-044>046-055>057-PAZ039-201700-
Yates-Steuben-Schuyler-Tompkins-Madison-Cortland-Chenango-Otsego-
Tioga-Broome-Delaware-Susquehanna-
1158 AM EST Fri Feb 19 2021

This Hazardous Weather Outlook is for central New York and
northeast Pennsylvania.

.DAY ONE...This afternoon and tonight.

Lake effect snow showers will begin to develop tonight, southeast of
Lake Ontario, with light accumulations.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Scattered snow squalls will be possible Saturday, with brief low
visibilities and slick roads. Be prepared for rapid changes in
conditions.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

NYZ016>018-201700-
Seneca-Southern Cayuga-Onondaga-
1158 AM EST Fri Feb 19 2021

...WINTER STORM WATCH IN EFFECT FROM 6 PM EST THIS EVENING THROUGH
SATURDAY EVENING...

This Hazardous Weather Outlook is for central New York.

.DAY ONE...This afternoon and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Winter Storm Watch.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Winter Storm Watch.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Feb 19, 11:41 AM EST, 3 hours 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
1141 AM EST FRI FEB 19 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1130 AM     SNOW             BEAVER DAMS             42.28N 76.97W
02/19/2021  E2.0 INCH        SCHUYLER           NY   PUBLIC

&&

BJG
Local storm report, Feb 19, 11:42 AM EST, 3 hours 1 minute before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
1142 AM EST FRI FEB 19 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1130 AM     SNOW             3 NE TOMPKINS CORNERS   42.23N 76.85W
02/19/2021  E1.5 INCH        CHEMUNG            NY   PUBLIC

&&

BJG
Local storm report, Feb 19, 11:46 AM EST, 2 hours 57 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
1146 AM EST FRI FEB 19 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1145 AM     SNOW             NWS BINGHAMTON          42.21N 75.99W
02/19/2021  M2.8 INCH        BROOME             NY   OFFICIAL NWS OBS

&&

BJG
Local storm report, Feb 19, 12:03 PM EST, 2 hours 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
1203 PM EST FRI FEB 19 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1200 PM     SNOW             TAYLOR                  41.40N 75.71W
02/19/2021  M3.2 INCH        LACKAWANNA         PA   BROADCAST MEDIA

&&

BJG
Local storm report, Feb 19, 1:07 PM EST, 1 hour 36 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
107 PM EST FRI FEB 19 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0100 PM     SNOW             WAYMART                 41.59N 75.41W
02/19/2021  M6.5 INCH        WAYNE              PA   BROADCAST MEDIA

&&

BJG
Local storm report, Feb 19, 1:08 PM EST, 1 hour 35 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BINGHAMTON NY
108 PM EST FRI FEB 19 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0900 AM     SNOW             EAST MEREDITH           42.42N 74.88W
02/19/2021  E2.9 INCH        DELAWARE           NY   PUBLIC

            1700 FT. ELEVATION.

&&

BJG

The office that day

Everything else NWS Binghamton, NY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 19, 11:48 AM ESTWinter Weather AdvisoryBGMSullivan3 hr
Feb 19, 2:43 PM ESTWinter Weather AdvisoryBGMChenango, Cortland, Seneca, Tompkins33 hr

Nearby

Lake Effect Snow Warnings in New York, 2021Every lake effect snow warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.