Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 192, NWS State College, PA

August 10, 2021Lancaster County, Lebanon County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Aug 10, 2021, 6:17 PM EDT for Lancaster County, Lebanon County, Pennsylvania. It was in force for 73 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 10, 2021, 6:17 PM EDT (22:17 UTC)
Expired: Aug 10, 2021, 7:30 PM EDT
In force: 73 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Lancaster County, PA, Lebanon County, PA

The radar

The Philadelphia radar (KDIX), 156 km from the middle of the area, began a volume at 22:17 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.

What was reported inside it

Time	Report	Where	Remark
Aug 10, 6:46 PM EDT	TSTM WND DMG	1 Se Lititz, PA	WIRES DOWN.
Aug 10, 6:50 PM EDT	TSTM WND GST 59	2 S Lititz, PA	NUMEROUS POWER OUTAGES IN THE AREA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.3 hours before the alert went out and 176 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: 529 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 1096 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

152 
WUUS51 KCTP 102217
SVRCTP
PAC071-075-102330-
/O.NEW.KCTP.SV.W.0192.210810T2217Z-210810T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
617 PM EDT Tue Aug 10 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northern Lancaster County in south central Pennsylvania...
  Central Lebanon County in south central Pennsylvania...

* Until 730 PM EDT.

* At 617 PM EDT, severe thunderstorms were located along a line
  extending from near Fredericksburg to near Manheim to near Mount
  Joy, moving east at 15 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Lancaster, Lebanon, Ephrata, Lititz, Mount Joy, New Holland,
  Manheim, Annville, East Petersburg, Cornwall, Akron, Myerstown,
  Leola, Salunga-Landisville, Denver, Reamstown, Rothsville, Pleasant
  Hill, Marietta and Sand Hill.

This includes the following Interstates...
 The Pennsylvania Turnpike from mile markers 263 to 295.
 Interstate 78 from mile markers 3 to 7.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4010 7594 4006 7594 4006 7656 4021 7651
      4046 7648 4045 7636 4037 7625 4036 7620
      4031 7614 4014 7587
TIME...MOT...LOC 2217Z 264DEG 12KT 4042 7640 4022 7636 4008 7652 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Colbert

2 follow-up statements

038 
WWUS51 KCTP 102244
SVSCTP

Severe Weather Statement
National Weather Service State College PA
644 PM EDT Tue Aug 10 2021

PAC071-075-102330-
/O.CON.KCTP.SV.W.0192.000000T0000Z-210810T2330Z/
Lancaster PA-Lebanon PA-
644 PM EDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NORTHERN LANCASTER AND SOUTHEASTERN LEBANON COUNTIES...

At 644 PM EDT, severe thunderstorms were located along a line
extending from near Womelsdorf to Ephrata to near Mountville, moving
east at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Lancaster, Ephrata, Lititz, Mount Joy, New Holland, Manheim, East
Petersburg, Cornwall, Akron, Myerstown, Leola, Salunga-Landisville,
Denver, Reamstown, Rothsville, Marietta, Newmanstown, Adamstown,
Richland and Brickerville.

This includes The Pennsylvania Turnpike from mile markers 268 to 295.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4010 7594 4006 7594 4006 7656 4018 7652
      4021 7644 4038 7633 4041 7631 4037 7625
      4036 7620 4031 7614 4014 7587
TIME...MOT...LOC 2244Z 263DEG 15KT 4041 7620 4021 7616 4007 7646 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Colbert

826 
WWUS51 KCTP 102306
SVSCTP

Severe Weather Statement
National Weather Service State College PA
706 PM EDT Tue Aug 10 2021

PAC075-102315-
/O.CAN.KCTP.SV.W.0192.000000T0000Z-210810T2330Z/
Lebanon PA-
706 PM EDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LEBANON COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4010 7594 4006 7594 4006 7656 4010 7655
      4022 7631 4028 7625 4031 7616 4031 7614
      4014 7587
TIME...MOT...LOC 2305Z 285DEG 20KT 4034 7601 4014 7597 4000 7627 

$$

PAC071-102330-
/O.CON.KCTP.SV.W.0192.000000T0000Z-210810T2330Z/
Lancaster PA-
706 PM EDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NORTHERN LANCASTER COUNTY...

At 705 PM EDT, severe thunderstorms were located along a line
extending from Spring Ridge to Churchtown to Willow Street, moving
east at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Trained weather spotters.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Lancaster, Ephrata, Lititz, Mount Joy, New Holland, Manheim, East
Petersburg, Akron, Leola, Salunga-Landisville, Denver, Reamstown,
Rothsville, Marietta, Adamstown, Brickerville, Terre Hill,
Churchtown, Leacock and Bareville.

This includes The Pennsylvania Turnpike from mile markers 275 to 295.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4010 7594 4006 7594 4006 7656 4010 7655
      4022 7631 4028 7625 4031 7616 4031 7614
      4014 7587
TIME...MOT...LOC 2305Z 285DEG 20KT 4034 7601 4014 7597 4000 7627 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

Colbert

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 12:55 PM EDT	Heat Advisory	CTP	Adams, Columbia, Cumberland, Dauphin, Franklin, Juniata and 10 more	30 hr
Aug 10, 12:55 PM EDT	Heat Advisory	CTP	Adams, Bedford, Blair, Centre, Clinton, Columbia and 19 more	54 hr
Aug 10, 2:21 PM EDT	Special Weather Statement	CTP	Dauphin, Lebanon	24 min
Aug 10, 2:32 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lebanon	43 min
Aug 10, 3:12 PM EDT	Special Weather Statement	CTP	Bedford, Blair, Cambria, Somerset	33 min
Aug 10, 3:23 PM EDT	Special Weather Statement	CTP	Berks	37 min
Aug 10, 3:25 PM EDT	Special Weather Statement	CTP	Huntingdon, Juniata	50 min
Aug 10, 3:28 PM EDT	Special Weather Statement	CTP	Schuylkill	47 min
Aug 10, 4:14 PM EDT	Special Weather Statement	CTP	Juniata	31 min
Aug 10, 4:31 PM EDT	Special Weather Statement	CTP	Centre	29 min
Aug 10, 4:48 PM EDT	Special Weather Statement	CTP	Perry	27 min
Aug 10, 5:18 PM EDT	Special Weather Statement	CTP	Dauphin	42 min
Aug 10, 5:50 PM EDT	Special Weather Statement	CTP	Adams	40 min
Aug 10, 5:52 PM EDT	Special Weather Statement	CTP	Lebanon	38 min
Aug 10, 6:12 PM EDT	Special Weather Statement	CTP	Lancaster	63 min
Aug 10, 6:29 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	58 min
Aug 10, 7:00 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	75 min
Aug 10, 7:33 PM EDT	Areal Flood Advisory	CTP	Lancaster	2 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.