Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 21, NWS State College, PA

April 13, 2020Adams County, York County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Apr 13, 2020, 1:37 PM EDT for Adams County, York County, Pennsylvania. It was in force for 68 min. 3 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: Apr 13, 2020, 1:37 PM EDT (17:37 UTC)
Expired: Apr 13, 2020, 2:45 PM EDT
In force: 68 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 80.0 mph

Counties Adams County, PA, York County, PA

The radar

The Sterling radar (KLWX), 132 km from the middle of the area, began a volume at 17:39 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
Apr 13, 1:41 PM EDT	TSTM WND DMG	1 W Littlestown, PA	TREE DOWN ACROSS FISH AND GAME ROAD NEAR QUAIL COURT IN GERMANY TOWNSHIP.
Apr 13, 1:56 PM EDT	TSTM WND DMG	Elmwood, PA	TREES AND WIRES DOWN WALLACE ST. AT NORTH EAST ST.
Apr 13, 2:00 PM EDT	TSTM WND DMG	1 Nw Yorklyn, PA	TREES AND WIRES DOWN ON WILLIAMS ROAD NEAR RIDGEWOOD ROAD.

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
Apr 13, 11:33 AM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 5.6 hours before the alert went out and 132 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: 712 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 487 m²/s²
0-3 km storm-relative helicity: 684 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

060 
WUUS51 KCTP 131737
SVRCTP
PAC001-133-131845-
/O.NEW.KCTP.SV.W.0021.200413T1737Z-200413T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
137 PM EDT Mon Apr 13 2020

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Eastern Adams County in south central Pennsylvania...
  York County in south central Pennsylvania...

* Until 245 PM EDT.

* At 136 PM EDT, severe thunderstorms were located along a line
  extending from Lake Meade to Hampton to Littlestown to 7 miles
  northeast of Walkersville, moving east at 50 mph.

  These are very dangerous storms.

  HAZARD...80 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Extensive tree damage and power outages are likely. 
           Expect considerable damage to roofs, windows, and 
           vehicles. Flying debris will be dangerous to those caught 
           without shelter. Mobile homes will be heavily damaged.

* Locations impacted include...
  York, Lower Allen, Hanover, Weigelstown, Parkville, Red Lion, Spry,
  Dallastown, Hampton, Shiloh, East York, Stonybrook-Wilshire, West
  York, Littlestown, Shrewsbury, Codorus, Grantley, Valley Green,
  Tyler Run-Queens Gate and McSherrystown.

This includes the following Interstates...
 The Pennsylvania Turnpike from mile markers 240 to 245.
 Interstate 83 from mile markers 0 to 39.

This includes the following COVID-19 Test Sites... 
WellSpan Health...
Wellspan Family Medicine...
and York Expo Center.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 600 PM EDT for south central
Pennsylvania.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3972 7716 3988 7712 4002 7722 4015 7703
      4016 7691 4019 7693 4019 7691 4020 7693
      4023 7690 4021 7689 4022 7685 4017 7675
      4013 7674 4006 7666 4004 7657 4005 7653
      3995 7648 3991 7639 3987 7638 3972 7624
TIME...MOT...LOC 1736Z 251DEG 44KT 3999 7708 3991 7703 3975 7707 3953
7723

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...80MPH
 
$$

Colbert/MJ

2 follow-up statements

061 
WWUS51 KCTP 131802
SVSCTP

Severe Weather Statement
National Weather Service State College PA
202 PM EDT Mon Apr 13 2020

PAC001-131811-
/O.CAN.KCTP.SV.W.0021.000000T0000Z-200413T1845Z/
Adams PA-
202 PM EDT Mon Apr 13 2020

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN ADAMS COUNTY IS
CANCELLED...

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

A Tornado Watch remains in effect until 600 PM EDT for south central
Pennsylvania.

LAT...LON 3978 7700 3983 7700 3986 7696 3989 7698
      4017 7691 4020 7693 4023 7690 4021 7689
      4022 7685 4017 7675 4013 7674 4006 7666
      4004 7657 4005 7654 3995 7648 3991 7639
      3986 7637 3972 7624 3972 7699
TIME...MOT...LOC 1801Z 251DEG 44KT 4008 7672 4000 7667 3984 7671 3962
7688

$$

PAC133-131845-
/O.CON.KCTP.SV.W.0021.000000T0000Z-200413T1845Z/
York PA-
202 PM EDT Mon Apr 13 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR YORK COUNTY...

At 201 PM EDT, severe thunderstorms were located along a line
extending from Mount Wolf to Yorklyn to near Jacobus to Hampstead,
moving east at 50 mph.

These are very dangerous storms.

HAZARD...80 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Extensive tree damage and power outages are likely. Expect 
         considerable damage to roofs, windows, and vehicles. Flying 
         debris will be dangerous to those caught without shelter. 
         Mobile homes will be heavily damaged.

Locations impacted include...
York, Lower Allen, Hanover, Weigelstown, Parkville, Red Lion, Spry,
Dallastown, Shiloh, East York, Stonybrook-Wilshire, West York,
Shrewsbury, Codorus, Grantley, Valley Green, Tyler Run-Queens Gate,
Manchester, Hallam and Emigsville.

This includes the following Interstates...
 The Pennsylvania Turnpike from mile markers 239 to 245.
 Interstate 83 from mile markers 0 to 39.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 600 PM EDT for south central
Pennsylvania.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3978 7700 3983 7700 3986 7696 3989 7698
      4017 7691 4020 7693 4023 7690 4021 7689
      4022 7685 4017 7675 4013 7674 4006 7666
      4004 7657 4005 7654 3995 7648 3991 7639
      3986 7637 3972 7624 3972 7699
TIME...MOT...LOC 1801Z 251DEG 44KT 4008 7672 4000 7667 3984 7671 3962
7688

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...80MPH
 
$$

Colbert

448 
WWUS51 KCTP 131840
SVSCTP

Severe Weather Statement
National Weather Service State College PA
240 PM EDT Mon Apr 13 2020

PAC133-131850-
/O.EXP.KCTP.SV.W.0021.000000T0000Z-200413T1845Z/
York PA-
240 PM EDT Mon Apr 13 2020

...THE SEVERE THUNDERSTORM WARNING FOR YORK COUNTY WILL EXPIRE AT 245
PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

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 3978 7700 3983 7700 3986 7696 3989 7698
      4017 7691 4020 7693 4023 7690 4021 7689
      4022 7685 4017 7675 4013 7674 4006 7666
      4004 7657 4005 7654 3995 7648 3991 7639
      3986 7637 3972 7624 3972 7699
TIME...MOT...LOC 1840Z 251DEG 44KT 4023 7614 4015 7609 3999 7614 3977
7631

$$

Colbert

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 4:28 AM EDT	Special Weather Statement	CTP	Bedford	47 min
Apr 13, 5:48 AM EDT	Special Weather Statement	CTP	Huntingdon, Juniata	27 min
Apr 13, 6:18 AM EDT	Special Weather Statement	CTP	Franklin	27 min
Apr 13, 6:45 AM EDT	Special Weather Statement	CTP	Adams	45 min
Apr 13, 7:32 AM EDT	Special Weather Statement	CTP	Lancaster, York	43 min
Apr 13, 11:48 AM EDT	Severe Thunderstorm Warning	CTP	Cambria, Clearfield, Somerset	72 min
Apr 13, 12:16 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Franklin, Fulton	44 min
Apr 13, 12:32 PM EDT	Severe Thunderstorm Warning	CTP	Franklin, Fulton	58 min
Apr 13, 12:45 PM EDT	Severe Thunderstorm Warning	CTP	Blair, Cambria, Centre, Clearfield, Huntingdon	45 min
Apr 13, 12:52 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	38 min
Apr 13, 1:06 PM EDT	Severe Thunderstorm Warning	CTP	Adams	53 min
Apr 13, 1:25 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Huntingdon, Mifflin	50 min
Apr 13, 2:04 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Juniata, Lycoming, Mifflin, Perry and 2 more	41 min
Apr 13, 2:09 PM EDT	Areal Flood Advisory	CTP	Adams, Dauphin, Lancaster, Lebanon, York	3 hr
Apr 13, 2:13 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	58 min
Apr 13, 2:20 PM EDT	Special Weather Statement	CTP	Tioga	25 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2020 Every severe thunderstorm warning in 2020

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.