Alert archive / New York / Snow Squall Warnings in 2018

Snow Squall Warning 4, NWS Buffalo, NY

November 21, 20185 counties in New York

NWS Buffalo, NY issued this snow squall warning at Nov 21, 2018, 9:16 AM EST for 5 counties in New York. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Nov 21, 2018, 9:16 AM EST (14:16 UTC)
Expired: Nov 21, 2018, 10:15 AM EST
In force: 59 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Cayuga County, NY, Jefferson County, NY, Monroe County, NY, Oswego County, NY, Wayne County, NY

The radar

The Ft Drum radar (KTYX), 105 km from the middle of the area, began a volume at 14:18 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.

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 2.3 hours before the alert went out and 156 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 772 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 236 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

762 
WWUS51 KBUF 211418
SQWBUF

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Buffalo NY
916 AM EST Wed Nov 21 2018

NYC011-045-055-075-117-211515-
/O.NEW.KBUF.SQ.W.0004.181121T1416Z-181121T1515Z/
Wayne NY-Jefferson NY-Cayuga NY-Oswego NY-Monroe NY-
916 AM EST Wed Nov 21 2018

The National Weather Service in Buffalo has issued a

* Snow Squall Warning for...
  Central Wayne County in western New York...
  South central Jefferson County in central New York...
  Cayuga County in central New York...
  Oswego County in central New York...
  Monroe County in western New York...

* Until 1015 AM EST.

* At 916 AM EST, a dangerous snow squall was located along a line
  extending from near Southwick Beach State Park to near Hamlin Beach
  State Park, moving south at 20 mph.

  HAZARD...Poor visibility in heavy snow and blowing snow. Wind 
           gusts greater than 35 mph.

  SOURCE...Radar indicated.

  IMPACT...Dangerous life-threatening travel.

* This includes Interstate 81 between exits 33 and 40. This also 
  includes State Route 104, and portions of the Rochester 
  metropolitan area.
 
Locations impacted include...
Rochester, Greece, Irondequoit, Chili, Oswego, Fulton, Brockport,
East Rochester, Hilton and Webster.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Reduce your speed and turn on headlights! During snow squalls, the
visibility may suddenly drop to near zero in whiteout conditions.

&&

LAT...LON 4325 7646 4304 7789 4337 7798 4340 7787
      4339 7775 4328 7754 4333 7717 4331 7697
      4339 7673 4356 7645 4356 7628 4376 7628
      4383 7587 4349 7577
TIME...MOT...LOC 1416Z 348DEG 16KT 4371 7613 4331 7795 

$$

Apffel

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 21, 4:09 AM EST	Special Weather Statement	BUF	Erie, Genesee	51 min
Nov 21, 5:10 AM EST	Special Weather Statement	BUF	Erie, Genesee, Wyoming	50 min
Nov 21, 5:54 AM EST	Special Weather Statement	BUF	Jefferson	81 min
Nov 21, 5:58 AM EST	Special Weather Statement	BUF	Chautauqua, Erie, Wyoming	77 min
Nov 21, 8:49 AM EST	Snow Squall Warning	BUF	Monroe, Niagara, Orleans	26 min
Nov 21, 10:09 AM EST	Snow Squall Warning	BUF	Cayuga, Lewis, Oswego	36 min
Nov 21, 6:21 PM EST	Small Craft Advisory	BUF		10 hr

Nearby

Snow Squall Warnings in New York, 2018 Every snow squall warning in 2018

Sources

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