Alert archive / Pennsylvania / Wind Chill Advisories in 2015

Wind Chill Advisory 2, NWS Pittsburgh, PA

January 9, 201514 counties in Pennsylvania; 11 counties in Ohio; 6 counties in West Virginia

NWS Pittsburgh, PA issued this wind chill advisory at Jan 9, 2015, 4:55 AM EST for 14 counties in Pennsylvania; 11 counties in Ohio; 6 counties in West Virginia. It took effect at Jan 9, 2015, 7:00 PM EST. It was in force for 17 hr.

The area

The counties it named.

The facts

Issued: Jan 9, 2015, 4:55 AM EST (09:55 UTC)
In effect from: Jan 9, 2015, 7:00 PM EST
Expired: Jan 10, 2015, 12:26 PM EST
In force: 17 hr
Issued by: NWS Pittsburgh, PA

All 31 counties

Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Guernsey County, OH, Harrison County, OH, Jefferson County, OH, Monroe County, OH, Muskingum County, OH, Noble County, OH, Tuscarawas County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Fayette County, PA, Forest County, PA, Greene County, PA, Jefferson County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marion County, WV, Marshall County, WV, Ohio County, WV, Wetzel County, WV

The radar

The Pittsburgh radar (KPBZ), 25 km from the middle of the area, began a volume at 09:53 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

Pittsburgh, PA (KAGC), launched 00:00Z, 9.9 hours before the alert went out and 32 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: 1554 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 428 m²/s²
0-3 km storm-relative helicity: 559 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Pittsburgh, PA wrote its last area forecast discussion before this wind chill advisory went out at Jan 9, 2:36 AM EST, 2 hours 19 minutes earlier.

Area forecast discussion, Jan 9, 2:36 AM EST, 2 hours 19 minutes before

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Hazardous weather outlook, Jan 9, 2:07 AM EST, 2 hours 48 minutes before

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In the hours before

Special weather statement, Jan 8, 10:57 PM EST, 5 hours 58 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
1057 PM EST THU JAN 8 2015

PAZ008-009-015-016-022-090445-
ARMSTRONG PA-CLARION PA-FOREST PA-JEFFERSON PA-VENANGO PA-
1057 PM EST THU JAN 8 2015

...A SNOW SQUALL WILL AFFECT CLARION...EAST CENTRAL VENANGO...EXTREME
NORTHEASTERN ARMSTRONG...EXTREME SOUTH CENTRAL FOREST AND JEFFERSON
COUNTIES...

THIS SNOW SQUALL WILL RAPIDLY DROP VISIBILITY TO NEAR ZERO ALONG
AREA ROADS...INCLUDING PORTIONS OF INTERSTATE 80 IN
CLARION...VENANGO...AND JEFFERSON COUNTIES.  THE WIND DRIVEN SNOW
WILL ALSO COVER PREVIOUSLY TREATED ROADS CREATING DANGEROUS DRIVING
CONDITIONS.

  LOCATIONS IMPACTED INCLUDE...
  LIMESTONE...          COOK FOREST STATE PARK...
  CLEAR CREEK STATE PARK...                   SLIGO...
  KNOX...               CLARION...            SUMMERVILLE...
  BROOKVILLE...         REYNOLDSVILLE...      BROCKWAY...

PLEASE REPORT SIGNIFICANT WEATHER BY POSTING TO THE NWS PITTSBURGH
FACEBOOK PAGE OR BY USING TWITTER @NWSPITTSBURGH.

LAT...LON 4120 7871 4120 7876 4114 7879 4103 7880
      4106 7960 4133 7964 4135 7892 4127 7874
      4126 7873 4124 7874 4123 7870 4120 7870

Local storm report, Jan 9, 4:36 AM EST, 19 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 8, 10:57 PM EST	Special Weather Statement	PBZ	Clarion, Jefferson	48 min
Jan 9, 1:18 AM EST	Wind Advisory	PBZ	Fayette, Westmoreland	7 hr
Jan 9, 7:45 AM EST	Special Weather Statement	PBZ	Allegheny, Armstrong, Beaver, Butler, Lawrence, Washington	60 min
Jan 9, 8:45 AM EST	Special Weather Statement	PBZ	Allegheny, Armstrong, Beaver, Butler, Clarion, Greene and 2 more	60 min
Jan 9, 8:52 AM EST	Special Weather Statement	PBZ	Allegheny, Armstrong, Fayette, Greene, Indiana, Jefferson and 2 more	113 min

Nearby

Wind Chill Advisories in Pennsylvania, 2015 Wind Chill Advisories in Ohio, 2015 Wind Chill Advisories in West Virginia, 2015 Every wind chill advisory in 2015

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.