Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 51, NWS State College, PA

June 27, 20234 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 27, 2023, 2:03 PM EDT for 4 counties in Pennsylvania. It was in force for 72 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
Jun 27, 2023, 2:03 PM EDT (18:03 UTC)
Expired
Jun 27, 2023, 3:15 PM EDT
In force
72 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Dauphin County, PA, Lebanon County, PA, Northumberland County, PA, Schuylkill County, PA

The radar

The State College radar (KCCX), 129 km from the middle of the area, began a volume at 18:04 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, 6.1 hours before the alert went out and 196 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2023-06-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 133 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2023-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
133 J/kg
Mixed-layer CIN
-82 J/kg
Mixed-layer LCL
1066 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
88 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 Jun 27, 1:54 PM EDT, 9 minutes earlier.

Area forecast discussion, Jun 27, 1:54 PM EDT, 9 minutes before
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Hazardous weather outlook, Jun 27, 12:47 PM EDT, 1 hour 16 minutes before
Hazardous Weather Outlook
National Weather Service State College PA
1247 PM EDT Tue Jun 27 2023

PAZ004>006-010>012-017>019-024>027-033>037-045-281700-
Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield-
Northern Centre-Southern Centre-Cambria-Blair-Huntingdon-Mifflin-
Somerset-Bedford-Fulton-Franklin-Tioga-Southern Clinton-
1247 PM EDT Tue Jun 27 2023

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This afternoon and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PAZ051>053-057>059-065-066-281700-
Montour-Northumberland-Columbia-Dauphin-Schuylkill-Lebanon-York-
Lancaster-
1247 PM EDT Tue Jun 27 2023

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This afternoon and tonight.

Isolated marginally severe thunderstorms with gusty to locally
damaging winds are possible this afternoon and early evening.

Localized heavy rainfall may produce isolated instances of flooding
especially in urban and poor drainage areas. Areas that received
heavy rainfall yesterday will be more susceptible to flooding.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report significant hazardous weather.

PAZ028-041-042-046-049-050-056-063-064-281700-
Juniata-Northern Lycoming-Sullivan-Southern Lycoming-Union-Snyder-
Perry-Cumberland-Adams-
1247 PM EDT Tue Jun 27 2023

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This afternoon and tonight.

Localized heavy rainfall may produce isolated instances of flooding
especially in urban and poor drainage areas. Areas that received
heavy rainfall yesterday will be more susceptible to flooding.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report significant hazardous weather.

In the hours before

Local storm report, Jun 27, 11:03 AM EDT, 3 hours before
Preliminary Local Storm Report
National Weather Service State College PA
1103 AM EDT Tue Jun 27 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0850 PM     Tstm Wnd Dmg     1 WSW Middleburg        40.78N 77.06W
06/26/2023                   Snyder             PA   Trained Spotter

            Multiple tree limbs down along Iron Bridge
            Road.

&&

NPB
Special weather statement, Jun 27, 11:20 AM EDT, 2 hours 43 minutes before
Special Weather Statement
National Weather Service State College PA
1120 AM EDT Tue Jun 27 2023

PAZ063-065-271600-
York PA-Cumberland PA-
1120 AM EDT Tue Jun 27 2023

...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN YORK AND
NORTHEASTERN CUMBERLAND COUNTIES THROUGH NOON EDT...

At 1117 AM EDT, Doppler radar was tracking a strong thunderstorm
that was nearly stationary 2 miles east of Bioling Springs.

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
         possible.

Locations impacted include...
Lower Allen, Mechanicsburg, Camp Hill, Boiling Springs, Dillsburg,
Shiremanstown, Siddonsburg, Hogestown and Messiah College.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Very heavy rainfall is also occurring with this storm and may lead
to localized flooding of small streams, particularly between Boiling
Springs and Dillsburg. Do not drive your vehicle through flooded
roadways.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 4008 7707 4010 7713 4016 7714 4028 7700
      4018 7685
TIME...MOT...LOC 1517Z 237DEG 8KT 4015 7707

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

Lambert
Special weather statement, Jun 27, 12:33 PM EDT, 1 hour 30 minutes before
Special Weather Statement
National Weather Service State College PA
1233 PM EDT Tue Jun 27 2023

PAZ059-066-271715-
Lancaster PA-Lebanon PA-
1233 PM EDT Tue Jun 27 2023

...STRONG THUNDERSTORMS WILL IMPACT CENTRAL LANCASTER AND
SOUTHEASTERN LEBANON COUNTIES THROUGH 115 PM EDT...

At 1233 PM EDT, Doppler radar was tracking several strong
thunderstorms along a line extending from Cornwall to Lititz to near
Willow Street. Movement was northeast at 15 mph.

HAZARD...Wind gusts up to 50 mph and dime to penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Lancaster, Ephrata, Lititz, Millersville, Willow Street, New Holland,
Manheim, East Petersburg, Cornwall, Akron, Leola, Paradise, Denver,
Reamstown, Rothsville, Strasburg, Quarryville, Newmanstown, Richland
and Brickerville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Very heavy rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3985 7635 3987 7638 3990 7639 4004 7636
      4026 7640 4038 7625 4036 7621 4020 7604
      3986 7610 3983 7635
TIME...MOT...LOC 1633Z 244DEG 13KT 4025 7632 4011 7630 3989 7633

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

Lambert
Local storm report, Jun 27, 1:23 PM EDT, 40 minutes before
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Local storm report, Jun 27, 1:27 PM EDT, 36 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 26, 8:00 PM EDTSpecial Weather StatementCTPLycoming30 min
Jun 26, 8:04 PM EDTSpecial Weather StatementCTPYork26 min
Jun 26, 8:20 PM EDTSevere Thunderstorm WarningCTPDauphin, Lancaster, York40 min
Jun 26, 8:47 PM EDTSpecial Weather StatementCTPSnyder, Union28 min
Jun 26, 8:55 PM EDTSevere Thunderstorm WarningCTPDauphin39 min
Jun 26, 9:19 PM EDTSpecial Weather StatementCTPMontour, Northumberland26 min
Jun 26, 9:32 PM EDTSevere Thunderstorm WarningCTPNorthumberland20 min
Jun 26, 9:54 PM EDTAreal Flood AdvisoryCTPLycoming2 hr
Jun 26, 10:08 PM EDTSpecial Weather StatementCTPSullivan37 min
Jun 26, 10:09 PM EDTSpecial Weather StatementCTPSchuylkill21 min
Jun 27, 11:20 AM EDTSpecial Weather StatementCTPCumberland40 min
Jun 27, 12:33 PM EDTSpecial Weather StatementCTPLancaster42 min
Jun 27, 1:05 PM EDTSevere Thunderstorm WarningCTPLancaster, York70 min
Jun 27, 2:25 PM EDTSpecial Weather StatementCTPSullivan65 min
Jun 27, 2:41 PM EDTSpecial Weather StatementCTPColumbia64 min
Jun 27, 3:07 PM EDTSpecial Weather StatementCTPYork53 min
Jun 27, 3:15 PM EDTSevere Thunderstorm WarningCTPLancaster, Lebanon, Schuylkill45 min
Jun 27, 3:59 PM EDTSpecial Weather StatementCTPLancaster46 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2023Every severe thunderstorm warning in 2023

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.