Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 179, NWS State College, PA

July 17, 202112 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 17, 2021, 5:44 PM EDT for 12 counties in Pennsylvania. It was in force for 61 min. 8 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: Jul 17, 2021, 5:44 PM EDT (21:44 UTC)
Expired: Jul 17, 2021, 6:45 PM EDT
In force: 61 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Juniata County, PA, Lycoming County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Union County, PA

The radar

The State College radar (KCCX), 96 km from the middle of the area, began a volume at 21:47 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
Jul 17, 5:45 PM EDT	TSTM WND DMG	3 Ssw Duncannon, PA	TREES DOWN ALONG WATTS DRIVE SOUTH OF DUNCANNON.
Jul 17, 6:15 PM EDT	TSTM WND DMG	1 Ne Kulpmont, PA	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 NE KULPMONT. TREES ON WIRES.
Jul 17, 6:21 PM EDT	HAIL 1.25	3 Wnw Marysville, PA	DESCRIBED AS MEATBALL SIZED HAIL.
Jul 17, 6:23 PM EDT	TSTM WND DMG	4 Ssw Biggertown, PA	TREES DOWN AT THE INTERSECTION OF ROUTE 42 AND WINTERSTEEN SCHOOL ROAD.
Jul 17, 6:26 PM EDT	TSTM WND DMG	1 E Biggertown, PA	TREES DOWN ON HIGHWAY 118.
Jul 17, 6:28 PM EDT	TSTM WND DMG	2 Nnw West Milton, PA	TREES AND WIRES DOWN. TREES UPROOTED.
Jul 17, 6:30 PM EDT	TSTM WND DMG	2 N Montgomery Ferry, PA	LARGE TREE DOWN ON RIGHT LANE OF ROUTE 11 AT CHERRY ROAD.
Jul 17, 6:31 PM EDT	TSTM WND DMG	1 Ne Kulpmont, PA	TREES ON WIRES.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 17, 1:13 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.7 hours before the alert went out and 205 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: 538 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 1337 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

226 
WUUS51 KCTP 172144
SVRCTP
PAC037-041-043-067-081-093-097-099-107-109-113-119-172245-
/O.NEW.KCTP.SV.W.0179.210717T2144Z-210717T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
544 PM EDT Sat Jul 17 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  West central Schuylkill County in central Pennsylvania...
  Northumberland County in central Pennsylvania...
  Northwestern Dauphin County in south central Pennsylvania...
  Northeastern Juniata County in central Pennsylvania...
  Eastern Snyder County in central Pennsylvania...
  Montour County in central Pennsylvania...
  Southeastern Lycoming County in north central Pennsylvania...
  Central Columbia County in central Pennsylvania...
  Eastern Union County in central Pennsylvania...
  Northwestern Cumberland County in south central Pennsylvania...
  Southeastern Sullivan County in north central Pennsylvania...
  Eastern Perry County in south central Pennsylvania...

* Until 645 PM EDT.

* At 543 PM EDT, severe thunderstorms were located along a line
  extending from near Milton to near New Buffalo to near Newville,
  moving northeast at 30 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...
  Bloomsburg, Sunbury, Shamokin, Milton, Lewisburg, Selinsgrove,
  Danville, Northumberland, Kulpmont, Plainfield, Schlusser,
  Winfield, Millersburg, Marysville, Muncy, Watsontown, Elysburg,
  Fairview-Ferndale, Hughesville and Riverside.

For those driving on Interstate 80, this includes areas between the
Mile Run and Berwick-Lime Ridge exits, specifically from mile markers
208 to 237.

This includes the following Interstates...
 The Pennsylvania Turnpike from mile markers 213 to 220.
 Interstate 180 from mile markers 1 to 12.

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 4012 7747 4053 7712 4101 7699 4149 7649
      4149 7633 4083 7642 4040 7682
TIME...MOT...LOC 2143Z 225DEG 27KT 4102 7678 4047 7701 4014 7736 

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

Banghoff

2 follow-up statements

450 
WWUS51 KCTP 172203
SVSCTP

Severe Weather Statement
National Weather Service State College PA
603 PM EDT Sat Jul 17 2021

PAC107-109-119-172212-
/O.CAN.KCTP.SV.W.0179.000000T0000Z-210717T2245Z/
Schuylkill PA-Snyder PA-Union PA-
603 PM EDT Sat Jul 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL SCHUYLKILL...
EASTERN SNYDER AND EASTERN UNION COUNTIES IS CANCELLED...

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

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central, south central and north central Pennsylvania.

LAT...LON 4082 7650 4070 7658 4066 7670 4062 7663
      4056 7667 4040 7682 4021 7725 4019 7740
      4053 7712 4068 7708 4064 7700 4064 7693
      4072 7686 4080 7685 4088 7680 4096 7688
      4107 7686 4111 7689 4149 7649 4149 7633
TIME...MOT...LOC 2202Z 225DEG 27KT 4112 7665 4057 7688 4024 7724 

$$

PAC037-041-043-067-081-093-097-099-113-172245-
/O.CON.KCTP.SV.W.0179.000000T0000Z-210717T2245Z/
Northumberland PA-Dauphin PA-Juniata PA-Montour PA-Lycoming PA-
Columbia PA-Cumberland PA-Sullivan PA-Perry PA-
603 PM EDT Sat Jul 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR NORTHUMBERLAND...NORTHWESTERN DAUPHIN...NORTHEASTERN JUNIATA...
MONTOUR...SOUTHEASTERN LYCOMING...WESTERN COLUMBIA...NORTH CENTRAL
CUMBERLAND...SOUTHEASTERN SULLIVAN AND EASTERN PERRY COUNTIES...

At 602 PM EDT, severe thunderstorms were located along a line
extending from Exchange to near Millersburg to near Carlisle, moving
northeast at 30 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...
Bloomsburg, Sunbury, Shamokin, Milton, Lewisburg, Danville,
Northumberland, Plainfield, Schlusser, Millersburg, Marysville,
Muncy, Watsontown, Elysburg, Fairview-Ferndale, Hughesville,
Riverside, Trevorton, Lykens and Shamokin Dam.

For those driving on Interstate 80, this includes areas between the
Lewisburg-Williamsport and Bloomsburg-Light Street exits,
specifically from mile markers 211 to 234.

This includes the following Interstates...
 The Pennsylvania Turnpike from mile markers 214 to 219.
 Interstate 180 from mile markers 1 to 13.

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 4082 7650 4070 7658 4066 7670 4062 7663
      4056 7667 4040 7682 4021 7725 4019 7740
      4053 7712 4068 7708 4064 7700 4064 7693
      4072 7686 4080 7685 4088 7680 4096 7688
      4107 7686 4111 7689 4149 7649 4149 7633
TIME...MOT...LOC 2202Z 225DEG 27KT 4112 7665 4057 7688 4024 7724 

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

Banghoff

387 
WWUS51 KCTP 172239
SVSCTP

Severe Weather Statement
National Weather Service State College PA
639 PM EDT Sat Jul 17 2021

PAC037-041-043-067-081-093-097-099-113-172248-
/O.EXP.KCTP.SV.W.0179.000000T0000Z-210717T2245Z/
Northumberland PA-Dauphin PA-Juniata PA-Montour PA-Lycoming PA-
Columbia PA-Cumberland PA-Sullivan PA-Perry PA-
639 PM EDT Sat Jul 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHUMBERLAND...NORTHWESTERN
DAUPHIN...NORTHEASTERN JUNIATA...MONTOUR...SOUTHEASTERN LYCOMING...
WESTERN COLUMBIA...NORTH CENTRAL CUMBERLAND...SOUTHEASTERN SULLIVAN
AND EASTERN PERRY COUNTIES WILL EXPIRE AT 645 PM EDT...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire.  However heavy rain is still possible with 
these thunderstorms. A Severe Thunderstorm Warning remains in effect 
for eastern Lycoming, northern Columbia, and eastern Sullivan 
Counties until 715 PM. 

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
central, south central and north central Pennsylvania.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
State College PA.

LAT...LON 4082 7650 4070 7658 4066 7670 4062 7663
      4056 7667 4040 7682 4021 7725 4019 7740
      4053 7712 4068 7708 4064 7700 4064 7693
      4072 7686 4080 7685 4088 7680 4096 7688
      4107 7686 4111 7689 4149 7649 4149 7633
TIME...MOT...LOC 2238Z 225DEG 27KT 4130 7640 4075 7664 4043 7700 

$$

Banghoff

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 9:11 PM EDT	Special Weather Statement	CTP	Cumberland	34 min
Jul 16, 10:39 PM EDT	Areal Flood Advisory	CTP	Cumberland, Dauphin, Juniata, Northumberland, Perry, Snyder	2 hr
Jul 17, 4:33 AM EDT	Special Weather Statement	CTP	Warren	57 min
Jul 17, 6:36 AM EDT	Special Weather Statement	CTP	Warren	69 min
Jul 17, 7:46 AM EDT	Special Weather Statement	CTP	Elk, McKean	59 min
Jul 17, 10:23 AM EDT	Special Weather Statement	CTP	McKean	37 min
Jul 17, 12:01 PM EDT	Areal Flood Advisory	CTP	McKean	119 min
Jul 17, 12:35 PM EDT	Special Weather Statement	CTP	Potter	40 min
Jul 17, 12:55 PM EDT	Areal Flood Advisory	CTP	Warren	2 hr
Jul 17, 1:23 PM EDT	Special Weather Statement	CTP	Clinton	37 min
Jul 17, 1:33 PM EDT	Special Weather Statement	CTP	Lancaster	27 min
Jul 17, 1:48 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	42 min
Jul 17, 1:55 PM EDT	Flash Flood Warning	CTP	Cameron, Elk, McKean, Potter, Warren	3 hr
Jul 17, 2:13 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, Lebanon	47 min
Jul 17, 2:29 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	46 min
Jul 17, 2:46 PM EDT	Special Weather Statement	CTP	Cambria	29 min
Jul 17, 2:47 PM EDT	Areal Flood Advisory	CTP	Lancaster, Lebanon, Schuylkill, York	2 hr
Jul 17, 2:52 PM EDT	Severe Thunderstorm Warning	CTP	Schuylkill	38 min
Jul 17, 2:56 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	34 min
Jul 17, 3:02 PM EDT	Severe Thunderstorm Warning	CTP	Lebanon, Schuylkill	43 min
Jul 17, 3:04 PM EDT	Severe Thunderstorm Warning	CTP	Cambria, Clearfield, Somerset	56 min
Jul 17, 3:06 PM EDT	Special Weather Statement	CTP	Blair	24 min
Jul 17, 3:14 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	61 min
Jul 17, 3:17 PM EDT	Flash Flood Warning Considerable damage threat	CTP	Lycoming, Tioga	3 hr
Jul 17, 3:35 PM EDT	Special Weather Statement	CTP	Centre	25 min
Jul 17, 3:42 PM EDT	Special Weather Statement	CTP	York	33 min
Jul 17, 3:45 PM EDT	Special Weather Statement	CTP	Huntingdon	30 min
Jul 17, 3:48 PM EDT	Special Weather Statement	CTP	Lancaster	27 min
Jul 17, 3:52 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clearfield	23 min
Jul 17, 4:03 PM EDT	Special Weather Statement	CTP	Dauphin	27 min
Jul 17, 4:05 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Huntingdon, Juniata, Mifflin	55 min
Jul 17, 4:07 PM EDT	Areal Flood Advisory	CTP	Adams, Cumberland, Dauphin, Lancaster, Lebanon, York	2 hr
Jul 17, 4:14 PM EDT	Special Weather Statement	CTP	Dauphin	31 min
Jul 17, 4:14 PM EDT	Special Weather Statement	CTP	Tioga	46 min
Jul 17, 4:23 PM EDT	Special Weather Statement	CTP	Clinton	37 min
Jul 17, 4:24 PM EDT	Special Weather Statement	CTP	Dauphin	36 min
Jul 17, 4:32 PM EDT	Special Weather Statement	CTP	Lycoming	28 min
Jul 17, 4:34 PM EDT	Special Weather Statement	CTP	Centre	26 min
Jul 17, 4:38 PM EDT	Areal Flood Advisory	CTP	Clinton, Lycoming	2 hr
Jul 17, 4:44 PM EDT	Areal Flood Advisory	CTP	Bedford, Cumberland, Franklin, Fulton, Huntingdon, Juniata and 3 more	2 hr
Jul 17, 4:45 PM EDT	Special Weather Statement	CTP	Dauphin	30 min
Jul 17, 4:47 PM EDT	Special Weather Statement	CTP	Tioga	28 min
Jul 17, 4:50 PM EDT	Special Weather Statement	CTP	Somerset	25 min
Jul 17, 4:50 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Mifflin, Northumberland, Snyder, Union	55 min
Jul 17, 4:53 PM EDT	Areal Flood Advisory	CTP	Cameron, Elk, McKean, Potter, Warren	66 min
Jul 17, 4:56 PM EDT	Areal Flood Advisory	CTP	Columbia, Dauphin, Lycoming, Montour, Northumberland, Schuylkill and 3 more	61 min
Jul 17, 4:58 PM EDT	Special Weather Statement	CTP	Clinton	32 min
Jul 17, 5:02 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming	43 min
Jul 17, 5:08 PM EDT	Special Weather Statement	CTP	Franklin	37 min
Jul 17, 5:14 PM EDT	Flash Flood Warning Considerable damage threat	CTP	Lycoming, Sullivan	3 hr
Jul 17, 5:16 PM EDT	Special Weather Statement	CTP	Dauphin	29 min
Jul 17, 5:20 PM EDT	Areal Flood Advisory	CTP	Cumberland, Dauphin, Juniata, Lebanon, Perry	2 hr
Jul 17, 5:27 PM EDT	Special Weather Statement	CTP	Sullivan	33 min
Jul 17, 5:30 PM EDT	Special Weather Statement	CTP	Franklin	30 min
Jul 17, 5:42 PM EDT	Flash Flood Warning Considerable damage threat	CTP	Adams, Cumberland, Franklin, Fulton, Huntingdon, Perry	111 min
Jul 17, 5:56 PM EDT	Flash Flood Warning Considerable damage threat	CTP	Columbia, Cumberland, Dauphin, Juniata, Lebanon, Lycoming and 7 more	3 hr
Jul 17, 6:09 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Dauphin, Franklin, York	36 min
Jul 17, 6:22 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Sullivan	28 min
Jul 17, 6:44 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Dauphin, Lancaster, Lebanon, York	46 min
Jul 17, 6:57 PM EDT	Special Weather Statement	CTP	Schuylkill	33 min
Jul 17, 7:07 PM EDT	Areal Flood Advisory	CTP	Adams, York	2 hr
Jul 17, 7:34 PM EDT	Severe Thunderstorm Warning	CTP	Adams, York	56 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.