Alert archive / Pennsylvania / Snow Squall Warnings in 2021

Snow Squall Warning 3, NWS State College, PA

January 22, 20214 counties in Pennsylvania

NWS State College, PA issued this snow squall warning at Jan 22, 2021, 1:43 PM EST for 4 counties in Pennsylvania. It was in force for 77 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: Jan 22, 2021, 1:43 PM EST (18:43 UTC)
Expired: Jan 22, 2021, 3:00 PM EST
In force: 77 min
Issued by: NWS State College, PA
Area: Storm-based polygon

Counties Columbia County, PA, Lycoming County, PA, Sullivan County, PA, Tioga County, PA

The radar

The Binghamton radar (KBGM), 101 km from the middle of the area, began a volume at 18:42 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, 6.7 hours before the alert went out and 215 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: 919 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

740 
WWUS51 KCTP 221846
SQWCTP

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service State College PA
143 PM EST Fri Jan 22 2021

PAC037-081-113-117-222000-
/O.NEW.KCTP.SQ.W.0003.210122T1843Z-210122T2000Z/
Lycoming PA-Columbia PA-Tioga PA-Sullivan PA-
143 PM EST Fri Jan 22 2021

The National Weather Service in State College PA has issued a

* Snow Squall Warning for...
  Central Lycoming County in north central Pennsylvania...
  North central Columbia County in central Pennsylvania...
  Southern Tioga County in north central Pennsylvania...
  Sullivan County in north central Pennsylvania...

* Until 300 PM EST.

* At 143 PM EST, the leading edge of two bands of dangerous snow 
  squalls were located along a line extending from Shunk to near 
  English Center, moving east at 30 mph.

  HAZARD...Extremely poor visibility in snow and blowing snow. Wind 
           gusts up to 30 mph.

  SOURCE...Radar indicated.

  IMPACT...Expect hazardous road conditions.

* This includes Interstate 180 from mile markers 18 to 22, Route 15 
  in Lycoming and Tioga Counties, and Route 220 in Lycoming and 
  Sullivan Counties.

Locations impacted include...
Williamsport, Montoursville, Mansfield, Wellsboro, Morris,
Hughesville, Blossburg, Covington, Arnot, Jamison City, Waller,
Kettle Creek Gorge, Central, Ralston, Biggertown, Trout Run, Lincoln
Falls, Barbours, Shunk and Cogan Station.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Reduce your speed and turn on headlights! During snow squalls, the 
visibility may suddenly drop to near zero in whiteout conditions. 
Exit highways safely and consider delaying travel until the squall 
passes.

LAT...LON 4160 7687 4154 7622 4131 7631 4122 7632
      4126 7706 4145 7744 4184 7745 4189 7706
      4194 7692
TIME...MOT...LOC 1843Z 284DEG 28KT 4156 7671 4147 7736 

$$

DeVoir

The office that day

Everything else NWS State College, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 22, 9:51 AM EST	Special Weather Statement	CTP	Elk, McKean	54 min
Jan 22, 11:42 AM EST	Snow Squall Warning	CTP	Potter	48 min
Jan 22, 11:54 AM EST	Special Weather Statement	CTP	Cameron	66 min
Jan 22, 12:46 PM EST	Snow Squall Warning	CTP	Lycoming, Potter, Tioga	44 min
Jan 22, 1:48 PM EST	Special Weather Statement	CTP	Clinton	57 min
Jan 22, 4:00 PM EST	Special Weather Statement	CTP	Sullivan	30 min

Nearby

Snow Squall Warnings in Pennsylvania, 2021 Every snow squall 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.