Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 11, NWS State College, PA

April 15, 2024Adams County, York County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Apr 15, 2024, 3:37 PM EDT for Adams County, York County, Pennsylvania. It was in force for 23 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: Apr 15, 2024, 3:37 PM EDT (19:37 UTC)
Expired: Apr 15, 2024, 4:00 PM EDT
In force: 23 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Adams County, PA, York County, PA

The radar

The Sterling radar (KLWX), 111 km from the middle of the area, began a volume at 19:40 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.6 hours before the alert went out and 111 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: 2144 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 177 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS State College, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 15, 1:04 PM EDT, 2 hours 33 minutes earlier.

Area forecast discussion, Apr 15, 1:04 PM EDT, 2 hours 33 minutes before

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Hazardous weather outlook, Apr 15, 1:05 PM EDT, 2 hours 32 minutes before

Hazardous Weather Outlook
National Weather Service State College PA
Issued by National Weather Service Baltimore MD/Washington DC
105 PM EDT Mon Apr 15 2024

PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053-
056>059-063>066-161715-
Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield-
Northern Centre-Southern Centre-Cambria-Blair-Huntingdon-Mifflin-
Juniata-Somerset-Bedford-Fulton-Franklin-Tioga-Northern Lycoming-
Sullivan-Southern Clinton-Southern Lycoming-Union-Snyder-Montour-
Northumberland-Columbia-Perry-Dauphin-Schuylkill-Lebanon-Cumberland-
Adams-York-Lancaster-
105 PM EDT Mon Apr 15 2024

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This afternoon and tonight.

No hazardous weather is expected at this time.

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

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Apr 15, 1:23 PM EDT, 2 hours 14 minutes before

Special Weather Statement
National Weather Service State College PA
Issued by National Weather Service Baltimore MD/Washington DC
123 PM EDT Mon Apr 15 2024

PAZ036-064-151800-
Adams PA-Franklin PA-
123 PM EDT Mon Apr 15 2024

...A STRONG THUNDERSTORM WILL IMPACT WEST CENTRAL ADAMS AND EAST
CENTRAL FRANKLIN COUNTIES THROUGH 200 PM EDT...

At 122 PM EDT, Doppler radar was tracking a strong thunderstorm over
Chambersburg, moving east at 35 mph.

HAZARD...Wind gusts up to 40 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...
Chambersburg, Guilford, Fayetteville, Scotland, and Cashtown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3993 7774 4002 7769 3997 7746 3995 7747
      3996 7744 3994 7731 3981 7739
TIME...MOT...LOC 1722Z 287DEG 32KT 3995 7765

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

CTP

Special weather statement, Apr 15, 2:43 PM EDT, 54 minutes before

Special Weather Statement
National Weather Service State College PA
243 PM EDT Mon Apr 15 2024

PAZ036-063-151915-
Franklin PA-Cumberland PA-
243 PM EDT Mon Apr 15 2024

...A STRONG THUNDERSTORM WILL IMPACT EAST CENTRAL FRANKLIN AND
SOUTHWESTERN CUMBERLAND COUNTIES THROUGH 315 PM EDT...

At 242 PM EDT, Doppler radar was tracking a strong thunderstorm near
Shippensburg, moving east at 30 mph.

HAZARD...Wind gusts up to 40 mph and half inch 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...
Shippensburg, Upper Strasburg, Roxbury, Walnut Bottom, Orrstown, and
Shippensburg University.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4006 7775 4016 7769 4012 7727 4000 7735
      3999 7740 3997 7744
TIME...MOT...LOC 1842Z 284DEG 26KT 4009 7762

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Beaty

Special weather statement, Apr 15, 3:27 PM EDT, 10 minutes before

Special Weather Statement
National Weather Service State College PA
327 PM EDT Mon Apr 15 2024

PAZ064-065-152000-
York PA-Adams PA-
327 PM EDT Mon Apr 15 2024

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN ADAMS AND WEST
CENTRAL YORK COUNTIES THROUGH 400 PM EDT...

At 327 PM EDT, Doppler radar was tracking a strong thunderstorm near
Gettysburg, moving east at 30 mph.

HAZARD...Half inch hail.

SOURCE...Radar indicated.

IMPACT...Minor hail damage to vegetation is possible.

Locations impacted include...
Hampton, Lake Meade, Dover, New Oxford, East Berlin, Aspers,
Biglerville, Abbottstown, York Springs, Heidlersburg, Bendersville,
Idaville, and Gardners.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3994 7729 4002 7724 4003 7719 4004 7718
      4001 7686 3983 7694
TIME...MOT...LOC 1927Z 287DEG 25KT 3998 7719

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...<30 MPH

Beaty

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 14, 8:31 PM EDT	Areal Flood Advisory	CTP	Clearfield	119 min
Apr 14, 10:12 PM EDT	Areal Flood Advisory	CTP	Clearfield	81 min
Apr 15, 1:23 PM EDT	Special Weather Statement	CTP	Franklin	37 min
Apr 15, 2:43 PM EDT	Special Weather Statement	CTP	Cumberland	32 min
Apr 15, 3:27 PM EDT	Special Weather Statement	CTP	Adams	33 min
Apr 15, 3:58 PM EDT	Special Weather Statement	CTP	Lancaster	32 min
Apr 15, 4:00 PM EDT	Severe Thunderstorm Warning	CTP	York	60 min
Apr 15, 4:08 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	37 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.