Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 185, NWS State College, PA

July 21, 2021Franklin County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 21, 2021, 1:22 PM EDT for Franklin County, Pennsylvania. It was in force for 38 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 21, 2021, 1:22 PM EDT (17:22 UTC)
Expired: Jul 21, 2021, 2:00 PM EDT
In force: 38 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Franklin County, PA

The radar

The Sterling radar (KLWX), 87 km from the middle of the area, began a volume at 17:24 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 21, 11:56 AM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 5.4 hours before the alert went out and 92 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: 638 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1275 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

601 
WUUS51 KCTP 211722
SVRCTP
PAC055-211800-
/O.NEW.KCTP.SV.W.0185.210721T1722Z-210721T1800Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
122 PM EDT Wed Jul 21 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Southeastern Franklin County in south central Pennsylvania...

* Until 200 PM EDT.

* At 122 PM EDT, a severe thunderstorm was located near Greencastle,
  moving east at 25 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...
  Waynesboro, Greencastle, Wayne Heights, Rouzerville and State Line.

This includes Interstate 81 from mile markers 0 to 4.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3973 7780 3979 7777 3978 7746 3972 7746
TIME...MOT...LOC 1722Z 275DEG 20KT 3975 7771 

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

Banghoff

2 follow-up statements

717 
WWUS51 KCTP 211742
SVSCTP

Severe Weather Statement
National Weather Service State College PA
142 PM EDT Wed Jul 21 2021

PAC055-211800-
/O.CON.KCTP.SV.W.0185.000000T0000Z-210721T1800Z/
Franklin PA-
142 PM EDT Wed Jul 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR SOUTHEASTERN FRANKLIN COUNTY...

At 141 PM EDT, a severe thunderstorm was located over Wayne Heights,
moving east at 25 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...
Waynesboro, Wayne Heights, Rouzerville and State Line. 

This includes Interstate 81 from mile markers 1 to 2.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3973 7777 3975 7774 3977 7762 3976 7746
      3972 7746
TIME...MOT...LOC 1741Z 275DEG 20KT 3974 7757 

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

Banghoff

074 
WWUS51 KCTP 211750
SVSCTP

Severe Weather Statement
National Weather Service State College PA
150 PM EDT Wed Jul 21 2021

PAC055-211800-
/O.EXP.KCTP.SV.W.0185.000000T0000Z-210721T1800Z/
Franklin PA-
150 PM EDT Wed Jul 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FRANKLIN COUNTY
WILL EXPIRE AT 200 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
south 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 3973 7777 3975 7774 3977 7762 3976 7746
      3972 7746
TIME...MOT...LOC 1750Z 275DEG 20KT 3974 7752 

$$

Banghoff

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 10:08 PM EDT	Areal Flood Advisory	CTP	Tioga	2 hr
Jul 21, 12:25 AM EDT	Special Weather Statement	CTP	McKean	50 min
Jul 21, 12:58 AM EDT	Special Weather Statement	CTP	Potter	47 min
Jul 21, 8:33 AM EDT	Special Weather Statement	CTP	Snyder	27 min
Jul 21, 9:03 AM EDT	Special Weather Statement	CTP	Snyder	27 min
Jul 21, 10:22 AM EDT	Special Weather Statement	CTP	Huntingdon	38 min
Jul 21, 11:00 AM EDT	Special Weather Statement	CTP	Franklin	45 min
Jul 21, 11:40 AM EDT	Special Weather Statement	CTP	Franklin	35 min
Jul 21, 11:59 AM EDT	Special Weather Statement	CTP	Northumberland, Snyder	31 min
Jul 21, 12:06 PM EDT	Special Weather Statement	CTP	Franklin	24 min
Jul 21, 12:22 PM EDT	Special Weather Statement	CTP	Lebanon	38 min
Jul 21, 12:28 PM EDT	Special Weather Statement	CTP	Northumberland	32 min
Jul 21, 12:31 PM EDT	Special Weather Statement	CTP	Adams	29 min
Jul 21, 12:38 PM EDT	Special Weather Statement	CTP	Schuylkill	52 min
Jul 21, 12:55 PM EDT	Special Weather Statement	CTP	Dauphin	35 min
Jul 21, 1:00 PM EDT	Special Weather Statement	CTP	Adams	45 min
Jul 21, 1:13 PM EDT	Special Weather Statement	CTP	Lancaster	32 min
Jul 21, 1:16 PM EDT	Special Weather Statement	CTP	Franklin	29 min
Jul 21, 1:29 PM EDT	Special Weather Statement	CTP	Dauphin, Lebanon	31 min
Jul 21, 1:35 PM EDT	Special Weather Statement	CTP	Lancaster	25 min
Jul 21, 2:00 PM EDT	Special Weather Statement	CTP	Lancaster	45 min
Jul 21, 2:24 PM EDT	Special Weather Statement	CTP	Lancaster	36 min
Jul 21, 2:28 PM EDT	Special Weather Statement	CTP	York	32 min
Jul 21, 2:35 PM EDT	Special Weather Statement	CTP	Lancaster	40 min
Jul 21, 2:52 PM EDT	Special Weather Statement	CTP	Lancaster	38 min
Jul 21, 2:53 PM EDT	Special Weather Statement	CTP	Union	37 min
Jul 21, 3:25 PM EDT	Special Weather Statement	CTP	York	35 min
Jul 21, 4:00 PM EDT	Special Weather Statement	CTP	York	45 min
Jul 21, 4:02 PM EDT	Special Weather Statement	CTP	Snyder	28 min
Jul 21, 4:27 PM EDT	Special Weather Statement	CTP	Dauphin	33 min
Jul 21, 5:02 PM EDT	Special Weather Statement	CTP	Lebanon	28 min
Jul 21, 5:30 PM EDT	Special Weather Statement	CTP	Lebanon	30 min
Jul 21, 6:28 PM EDT	Special Weather Statement	CTP	Lancaster	32 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.