Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 158, NWS State College, PA

July 13, 20215 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 13, 2021, 10:18 PM EDT for 5 counties in Pennsylvania. It was in force for 57 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 13, 2021, 10:18 PM EDT (02:18 UTC)
Expired: Jul 13, 2021, 11:15 PM EDT
In force: 57 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Columbia County, PA, Montour County, PA, Northumberland County, PA, Snyder County, PA, Union County, PA

The radar

The State College radar (KCCX), 116 km from the middle of the area, began a volume at 02:21 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 13, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 2.3 hours before the alert went out and 249 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: 1133 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 1722 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 77 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

569 
WUUS51 KCTP 140218
SVRCTP
PAC037-093-097-109-119-140315-
/O.NEW.KCTP.SV.W.0158.210714T0218Z-210714T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
1018 PM EDT Tue Jul 13 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Northern Northumberland County in central Pennsylvania...
  Northeastern Snyder County in central Pennsylvania...
  Montour County in central Pennsylvania...
  Columbia County in central Pennsylvania...
  Eastern Union County in central Pennsylvania...

* Until 1115 PM EDT.

* At 1017 PM EDT, severe thunderstorms were located along a line
  extending from Allenwood to Lewisburg to near Linntown to Kreamer,
  moving northeast at 25 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Lewisburg, Allenwood, Watsontown, Winfield, New Columbia and 
  Linntown around 1020 PM EDT.
  Milton, Montandon and Delaware Run around 1030 PM EDT.
  Shamokin Dam and Hummels Wharf around 1040 PM EDT.
  Sunbury, Northumberland, Mooresburg, Riverside and Exchange around 
  1050 PM EDT.

Other locations impacted by these severe thunderstorms include
Turbotville, Washingtonville, Orangeville, Benton, West Milton,
Snydertown, Seven Points, Espy, New Berlin and Stillwater.

For those driving on Interstate 80, this includes areas between the
Mile Run and Berwick-Lime Ridge exits, specifically from mile markers
205 to 239.

This includes Interstate 180 from mile markers 1 to 9.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4110 7632 4086 7647 4071 7710 4096 7696
      4110 7698 4115 7696 4114 7690 4116 7688
      4117 7680 4117 7673 4115 7668 4116 7659
      4131 7641 4131 7631 4120 7632 4116 7630
TIME...MOT...LOC 0217Z 246DEG 21KT 4110 7690 4099 7689 4092 7692 4081
7699

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

Jurewicz

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 8:08 PM EDT	Special Weather Statement	CTP	Franklin	37 min
Jul 13, 8:09 PM EDT	Special Weather Statement	CTP	Lycoming	36 min
Jul 13, 8:17 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Northumberland, Union	43 min
Jul 13, 8:25 PM EDT	Special Weather Statement	CTP	Huntingdon	35 min
Jul 13, 8:41 PM EDT	Areal Flood Advisory	CTP	Lycoming, Sullivan, Tioga	25 min
Jul 13, 8:51 PM EDT	Tornado Warning	CTP	Lycoming, Montour, Northumberland	24 min
Jul 13, 8:59 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Sullivan	61 min
Jul 13, 9:06 PM EDT	Flash Flood Warning	CTP	Lycoming, Sullivan, Tioga	3 hr
Jul 13, 9:15 PM EDT	Special Weather Statement	CTP	Lycoming	30 min
Jul 13, 9:30 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming, Northumberland, Snyder, Union	60 min
Jul 13, 10:18 PM EDT	Areal Flood Advisory	CTP	Centre, Clinton, Columbia, Lycoming, Montour, Northumberland and 2 more	117 min
Jul 13, 11:18 PM EDT	Special Weather Statement	CTP	Columbia, Montour	27 min
Jul 14, 12:12 AM EDT	Areal Flood Advisory	CTP	Columbia, Montour, Northumberland	2 hr
Jul 14, 1:46 AM EDT	Areal Flood Advisory	CTP	Lycoming	119 min
Jul 14, 1:49 PM EDT	Special Weather Statement	CTP	Perry	26 min
Jul 14, 4:08 PM EDT	Special Weather Statement	CTP	Perry	37 min
Jul 14, 4:58 PM EDT	Special Weather Statement	CTP	Sullivan	32 min
Jul 14, 6:52 PM EDT	Special Weather Statement	CTP	Lycoming	23 min
Jul 14, 7:31 PM EDT	Special Weather Statement	CTP	Columbia	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.