Alert archive / New York / Snow Squall Warnings in 2018

Snow Squall Warning 3, NWS Buffalo, NY

November 21, 2018Monroe County, Niagara County, Orleans County, New York

NWS Buffalo, NY issued this snow squall warning at Nov 21, 2018, 8:49 AM EST for Monroe County, Niagara County, Orleans County, New York. It was in force for 26 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, 8:49 AM EST (13:49 UTC)
Expired: Nov 21, 2018, 9:15 AM EST
In force: 26 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Monroe County, NY, Niagara County, NY, Orleans County, NY

The radar

The Buffalo radar (KBUF), 61 km from the middle of the area, began a volume at 13:49 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, 1.8 hours before the alert went out and 60 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.

134 
WWUS51 KBUF 211350
SQWBUF

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

NYC055-063-073-211415-
/O.NEW.KBUF.SQ.W.0003.181121T1349Z-181121T1415Z/
Niagara NY-Orleans NY-Monroe NY-
849 AM EST Wed Nov 21 2018

The National Weather Service in Buffalo has issued a

* Snow Squall Warning for...
  Niagara County in western New York...
  Orleans County in western New York...
  Northern Monroe County in western New York...

* Until 915 AM EST.

* At 849 AM EST, a dangerous snow squall was located along a line
  extending from 20 miles north of Ontario to 6 miles east of
  Youngstown, moving southeast at 30 mph.

  HAZARD...Heavy snow.

  SOURCE...Radar indicated.

  IMPACT...Dangerous life-threatening travel.


Locations impacted include...
Rochester, Greece, Irondequoit, Lockport, Brockport, Medina, Albion,
Hilton, Webster and Brighton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow Down! Rapid changes in visibility and road conditions are
expected with this dangerous snow squall. Be alert for sudden
whiteout conditions.

&&

LAT...LON 4328 7903 4342 7831 4341 7796 4339 7775
      4328 7754 4332 7738 4313 7738 4313 7893
TIME...MOT...LOC 1349Z 324DEG 26KT 4352 7730 4323 7892 

$$

Reynolds

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, 9:16 AM EST	Snow Squall Warning	BUF	Cayuga, Jefferson, Monroe, Oswego, Wayne	59 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.