Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 107, NWS State College, PA

July 9, 2021Lancaster County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 9, 2021, 6:13 PM EDT for Lancaster County, Pennsylvania. It was in force for 47 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: Jul 9, 2021, 6:13 PM EDT (22:13 UTC)
Expired: Jul 9, 2021, 7:00 PM EDT
In force: 47 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

County Lancaster County, PA

The radar

The Philadelphia radar (KDIX), 139 km from the middle of the area, began a volume at 22:13 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, 10.2 hours before the alert went out and 175 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: 862 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

277 
WUUS51 KCTP 092213
SVRCTP
PAC071-092300-
/O.NEW.KCTP.SV.W.0107.210709T2213Z-210709T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
613 PM EDT Fri Jul 9 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northeastern Lancaster County in south central Pennsylvania...

* Until 700 PM EDT.

* At 610 PM EDT, a severe thunderstorm was located over Bareville,
  moving east southeast at 30 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* This severe thunderstorm will be near...
  Terre Hill around 620 PM EDT.
  Churchtown around 630 PM EDT.

Other locations impacted by this severe thunderstorm include
Goodville, White Horse, Bowmansville, Fivepointville, Blue Ball,
Farmersville and Intercourse.

This includes the following highways...
 Route 222 from Brownstown to near Ephrata.
 Route 322 from Ephrata to the Chester county line.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. This storm is producing numerous 
downed trees across across northern Lancaster, some falling onto 
houses. SEEK SHELTER NOW inside a sturdy structure and stay away 
from windows!

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. This storm may cause serious injury and significant
property damage.

&&

LAT...LON 4011 7593 4010 7594 4004 7594 3999 7597
      4011 7627 4016 7626 4021 7622 4021 7599
      4014 7587
TIME...MOT...LOC 2210Z 282DEG 24KT 4010 7615 

HAIL...<.75IN
WIND...70MPH
 
$$

Lambert

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 3:36 PM EDT	Special Weather Statement	CTP	Juniata	24 min
Jul 9, 3:49 PM EDT	Special Weather Statement	CTP	York	26 min
Jul 9, 4:02 PM EDT	Special Weather Statement	CTP	Lycoming	28 min
Jul 9, 4:04 PM EDT	Special Weather Statement	CTP	Perry	26 min
Jul 9, 4:16 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Juniata, Lebanon, Perry, Schuylkill	74 min
Jul 9, 4:21 PM EDT	Special Weather Statement	CTP	York	24 min
Jul 9, 4:49 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lebanon	56 min
Jul 9, 5:24 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lancaster, Lebanon, York	81 min
Jul 9, 6:22 PM EDT	Special Weather Statement	CTP	York	38 min
Jul 9, 6:41 PM EDT	Special Weather Statement	CTP	Schuylkill	49 min
Jul 9, 7:00 PM EDT	Special Weather Statement	CTP	Lancaster	30 min
Jul 9, 7:16 PM EDT	Special Weather Statement	CTP	Tioga	29 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2021 Every 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.