Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 24, NWS State College, PA

June 9, 2021Lancaster County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 9, 2021, 8:03 PM EDT for Lancaster County, Pennsylvania. It was in force for 27 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, 8:03 PM EDT (00:03 UTC)
Expired: Jun 9, 2021, 8:30 PM EDT
In force: 27 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Lancaster County, PA

The radar

The Philadelphia radar (KDIX), 135 km from the middle of the area, began a volume at 00:04 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 00:00Z, 0.1 hours before the alert went out and 170 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: 186 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1395 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

450 
WUUS51 KCTP 100003
SVRCTP
PAC071-100030-
/O.NEW.KCTP.SV.W.0024.210610T0003Z-210610T0030Z/

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

The National Weather Service in State College PA has issued a

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

* Until 830 PM EDT.

* At 803 PM EDT, a severe thunderstorm was located near New Holland,
  moving southeast at 15 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...
  New Holland, Paradise, Gap, Churchtown, Intercourse, Christiana,
  Blue Ball, Goodville and White Horse.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4010 7594 4004 7594 3996 7599 3993 7598
      3993 7600 3989 7599 4005 7615 4015 7605
      4013 7591
TIME...MOT...LOC 0003Z 299DEG 8KT 4006 7605 

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

Martin

1 follow-up statement

867 
WWUS51 KCTP 100020
SVSCTP

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

PAC071-100030-
/O.CON.KCTP.SV.W.0024.000000T0000Z-210610T0030Z/
Lancaster PA-
820 PM EDT Wed Jun 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR EAST CENTRAL LANCASTER COUNTY...

At 818 PM EDT, a severe thunderstorm was near the Lancaster, Chester 
County line, moving southeast at 10 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...
New Holland, Paradise, Gap, Churchtown, Intercourse, Christiana, Blue
Ball, Goodville and White Horse.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4010 7594 4004 7594 3996 7599 3993 7598
      3993 7600 3989 7599 4005 7615 4015 7605
      4013 7591
TIME...MOT...LOC 0018Z 299DEG 8KT 4004 7601 

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

Martin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 8:00 PM EDT	Special Weather Statement	CTP	Lancaster	15 min
Jun 9, 8:20 PM EDT	Areal Flood Advisory	CTP	Lancaster	85 min
Jun 9, 8:54 PM EDT	Special Weather Statement	CTP	Chester	21 min
Jun 10, 6:19 AM EDT	Areal Flood Advisory	CTP	Blair, Cambria	86 min
Jun 10, 11:47 AM EDT	Flash Flood Watch	CTP	Adams, Bedford, Blair, Cambria, Cumberland, Franklin and 5 more	9 hr
Jun 10, 3:05 PM EDT	Special Weather Statement	CTP	York	40 min
Jun 10, 3:56 PM EDT	Areal Flood Advisory	CTP	Adams, Franklin, York	3 hr

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.