Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 166, NWS Pittsburgh, PA

July 15, 2024Jefferson County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 15, 2024, 3:11 PM EDT for Jefferson County, Pennsylvania. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 15, 2024, 3:11 PM EDT (19:11 UTC)
Expired: Jul 15, 2024, 3:45 PM EDT
In force: 34 min
Issued by: NWS Pittsburgh, PA
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Jefferson County, PA

The radar

The State College radar (KCCX), 87 km from the middle of the area, began a volume at 19:14 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, 7.2 hours before the alert went out and 202 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: 823 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 513 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 39 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jul 15, 3:04 PM EDT, 7 minutes earlier.

Area forecast discussion, Jul 15, 3:04 PM EDT, 7 minutes before

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Hazardous weather outlook, Jul 15, 1:57 PM EDT, 1 hour 14 minutes before

Hazardous Weather Outlook
National Weather Service Pittsburgh PA
157 PM EDT Mon Jul 15 2024

OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>022-029-
031-073>078-WVZ001>004-012-021-509>514-161800-
Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH-
Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Forest-
Lawrence-Butler-Clarion-Jefferson PA-Beaver-Allegheny-Armstrong-
Washington-Greene-Westmoreland-Higher Elevations of Westmoreland-
Fayette-Higher Elevations of Fayette-Indiana-
Higher Elevations of Indiana-Hancock-Brooke-Ohio-Marshall-Wetzel-
Marion-Monongalia-
Ridges of Eastern Monongalia and Northwestern Preston-Preston-
Eastern Preston-Western Tucker-Eastern Tucker-
157 PM EDT Mon Jul 15 2024

This Hazardous Weather Outlook is for east central Ohio, western
Pennsylvania, and northern West Virginia.

.DAY ONE...This afternoon and tonight.

Damaging wind gusts will be possible with stronger thunderstorms
this afternoon and early evening. There is a low chance of damaging
winds late tonight, an isolated spin up could not be ruled out.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Strong to severe storms are anticipated to track through the region
again on Tuesday. Damaging wind gusts will again be the main threat,
but large hail, a few tornadoes, and flash flooding will all be
possible as well.

If strong to severe storms are absent across the region on Tuesday,
there is the potential for dangerous heat. Max temperatures could
range in the mid to upper-90s and heat indices could range from 100F
to 105F.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

Milcarek

In the hours before

Special weather statement, Jul 15, 1:59 PM EDT, 1 hour 12 minutes before

Special Weather Statement
National Weather Service Pittsburgh PA
159 PM EDT Mon Jul 15 2024

PAZ014-151830-
Butler PA-
159 PM EDT Mon Jul 15 2024

...A STRONG THUNDERSTORM WILL IMPACT SOUTHERN BUTLER COUNTY THROUGH
230 PM EDT...

At 159 PM EDT, Doppler radar was tracking a strong thunderstorm near
Meridian, or near Butler, moving east at 25 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Butler, Homeacre-Lyndora, Shanor-Northvue, Meridian, Meadowood, Oak
Hills, Nixon, East Butler, and Connoquenessing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4074 8003 4083 8008 4093 7983 4080 7974
TIME...MOT...LOC 1759Z 248DEG 20KT 4080 7999

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

Milcarek

Special weather statement, Jul 15, 2:10 PM EDT, 1 hour 1 minute before

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Special weather statement, Jul 15, 2:31 PM EDT, 40 minutes before

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Special weather statement, Jul 15, 2:56 PM EDT, 15 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
Jul 15, 1:59 PM EDT	Special Weather Statement	PBZ	Butler	31 min
Jul 15, 2:10 PM EDT	Special Weather Statement	PBZ	Butler	35 min
Jul 15, 2:31 PM EDT	Special Weather Statement	PBZ	Clarion	29 min
Jul 15, 2:56 PM EDT	Special Weather Statement	PBZ	Clarion, Jefferson	34 min
Jul 15, 6:57 PM EDT	Special Weather Statement	PBZ	Brooke	33 min
Jul 15, 7:47 PM EDT	Severe Thunderstorm Warning	PBZ	Marshall	24 min
Jul 15, 7:49 PM EDT	Special Weather Statement	PBZ	Tyler	26 min
Jul 15, 5:08 PM EDT	Special Weather Statement	PBZ	Muskingum	37 min
Jul 15, 5:52 PM EDT	Severe Thunderstorm Warning	PBZ	Muskingum	38 min
Jul 15, 5:53 PM EDT	Special Weather Statement	PBZ	Muskingum	37 min
Jul 15, 6:02 PM EDT	Severe Thunderstorm Warning	PBZ	Muskingum	28 min
Jul 15, 6:27 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PBZ	Guernsey, Muskingum, Noble	48 min
Jul 15, 7:00 PM EDT	Special Weather Statement	PBZ	Guernsey	30 min
Jul 15, 7:20 PM EDT	Special Weather Statement	PBZ	Belmont	25 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2024 Every severe thunderstorm warning in 2024

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.