Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 23, NWS State College, PA

June 9, 2021Lancaster County, York County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 9, 2021, 7:09 PM EDT for Lancaster County, York County, Pennsylvania. It was in force for 51 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
Jun 9, 2021, 7:09 PM EDT (23:09 UTC)
Expired
Jun 9, 2021, 8:00 PM EDT
In force
51 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Lancaster County, PA, York County, PA

The radar

The Dover AFB radar (KDOX), 124 km from the middle of the area, began a volume at 23:08 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, 11.2 hours before the alert went out and 139 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 2021-06-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 193 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2021-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -75 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
193 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
1225 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-75 m²/s²
0-3 km storm-relative helicity
3 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

863 
WUUS51 KCTP 092309
SVRCTP
PAC071-133-100000-
/O.NEW.KCTP.SV.W.0023.210609T2309Z-210610T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
709 PM EDT Wed Jun 9 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  South central Lancaster County in south central Pennsylvania...
  Southeastern York County in south central Pennsylvania...

* Until 800 PM EDT.

* At 709 PM EDT, a severe thunderstorm was located over Holtwood,
  moving southeast at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Delta, Wakefield, Holtwood, Sunnyburn, Smithville, Shenks Ferry,
  Susquehanna Trails, Little Britain, Buck, Peach Bottom, Airville
  and Rawlinsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3982 7648 3997 7629 3979 7604 3978 7606
      3976 7606 3976 7608 3975 7608 3974 7610
      3973 7610 3974 7611 3972 7614 3972 7639
TIME...MOT...LOC 2309Z 318DEG 21KT 3983 7633 

HAIL...1.00IN
WIND...60MPH
 
$$

Martin
1 follow-up statement
139 
WWUS51 KCTP 092335
SVSCTP

Severe Weather Statement
National Weather Service State College PA
735 PM EDT Wed Jun 9 2021

PAC071-133-100000-
/O.CON.KCTP.SV.W.0023.000000T0000Z-210610T0000Z/
Lancaster PA-York PA-
735 PM EDT Wed Jun 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR SOUTH CENTRAL LANCASTER AND SOUTHEASTERN YORK COUNTIES...

At 733 PM EDT, a severe thunderstorm was located just south of 
Smithville, moving southeast at 25 mph. Other strong storms were 
nearby.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Delta, Wakefield, Holtwood, Sunnyburn, Smithville, Shenks Ferry,
Susquehanna Trails, Little Britain, Buck, Peach Bottom, Airville and
Rawlinsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3982 7648 3997 7629 3979 7604 3978 7606
      3976 7606 3976 7608 3975 7608 3974 7610
      3973 7610 3974 7611 3972 7614 3972 7639
TIME...MOT...LOC 2333Z 318DEG 21KT 3972 7620 

HAIL...1.00IN
WIND...60MPH
 
$$

Martin

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 9, 1:37 PM EDTSpecial Weather StatementCTPTioga53 min
Jun 9, 2:04 PM EDTSevere Thunderstorm WarningCTPPotter26 min
Jun 9, 2:11 PM EDTSpecial Weather StatementCTPClearfield34 min
Jun 9, 2:18 PM EDTSpecial Weather StatementCTPElk27 min
Jun 9, 2:36 PM EDTSpecial Weather StatementCTPPotter24 min
Jun 9, 2:43 PM EDTSpecial Weather StatementCTPBlair32 min
Jun 9, 2:51 PM EDTSpecial Weather StatementCTPPotter24 min
Jun 9, 2:55 PM EDTSpecial Weather StatementCTPDauphin35 min
Jun 9, 2:59 PM EDTSpecial Weather StatementCTPCentre31 min
Jun 9, 3:03 PM EDTSpecial Weather StatementCTPHuntingdon27 min
Jun 9, 3:08 PM EDTSpecial Weather StatementCTPMcKean37 min
Jun 9, 3:14 PM EDTSpecial Weather StatementCTPCameron31 min
Jun 9, 3:27 PM EDTSpecial Weather StatementCTPDauphin33 min
Jun 9, 3:36 PM EDTSpecial Weather StatementCTPForest24 min
Jun 9, 3:52 PM EDTSpecial Weather StatementCTPMcKean23 min
Jun 9, 4:02 PM EDTSevere Thunderstorm WarningCTPMcKean, Warren28 min
Jun 9, 4:31 PM EDTSpecial Weather StatementCTPWarren59 min
Jun 9, 5:09 PM EDTSpecial Weather StatementCTPWarren66 min
Jun 9, 5:13 PM EDTSpecial Weather StatementCTPYork62 min
Jun 9, 5:35 PM EDTAreal Flood AdvisoryCTPCumberland, York85 min
Jun 9, 5:36 PM EDTSpecial Weather StatementCTPSchuylkill54 min
Jun 9, 5:46 PM EDTSevere Thunderstorm WarningCTPSchuylkill44 min
Jun 9, 6:00 PM EDTSpecial Weather StatementCTPAdams30 min
Jun 9, 6:14 PM EDTAreal Flood AdvisoryCTPSchuylkill23 min
Jun 9, 6:28 PM EDTSevere Thunderstorm WarningCTPSchuylkill62 min
Jun 9, 6:30 PM EDTSpecial Weather StatementCTPYork45 min
Jun 9, 6:37 PM EDTFlash Flood WarningCTPSchuylkill3 hr
Jun 9, 6:38 PM EDTSpecial Weather StatementCTPLycoming52 min
Jun 9, 7:05 PM EDTSpecial Weather StatementCTPLancaster40 min
Jun 9, 7:54 PM EDTSpecial Weather StatementCTPLancaster36 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2021Every severe thunderstorm 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.