Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 160, NWS State College, PA

July 16, 2021McKean County, Potter County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 16, 2021, 2:18 PM EDT for McKean County, Potter County, Pennsylvania. It was in force for 42 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: Jul 16, 2021, 2:18 PM EDT (18:18 UTC)
Expired: Jul 16, 2021, 3:00 PM EDT
In force: 42 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties McKean County, PA, Potter County, PA

The radar

The State College radar (KCCX), 100 km from the middle of the area, began a volume at 18:22 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 16, 2:28 PM EDT	TSTM WND DMG	2 Se Port Allegany, PA	1 UTILITY POLE DOWN INTERSECTION OF US-6 AND SENECA DR.
Jul 16, 2:40 PM EDT	TSTM WND DMG	1 N Roulette, PA	TREE DOWN BLOCKING ROAD INTERSECTION OF MAIN AND SCHOOL ST. ROULETTE TWP.

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

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 6.3 hours before the alert went out and 131 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: 1011 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

707 
WUUS51 KCTP 161818
SVRCTP
PAC083-105-161900-
/O.NEW.KCTP.SV.W.0160.210716T1818Z-210716T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
218 PM EDT Fri Jul 16 2021

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  East central McKean County in north central Pennsylvania...
  Northwestern Potter County in north central Pennsylvania...

* Until 300 PM EDT.

* At 218 PM EDT, a severe thunderstorm was located over Port
  Allegany, moving east at 20 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...
  Coudersport, Port Allegany, Roulette and Oswayo. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4176 7841 4185 7839 4194 7802 4169 7801
TIME...MOT...LOC 1818Z 263DEG 19KT 4182 7833 

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

Evanego

2 follow-up statements

095 
WWUS51 KCTP 161830
SVSCTP

Severe Weather Statement
National Weather Service State College PA
230 PM EDT Fri Jul 16 2021

PAC083-105-161900-
/O.CON.KCTP.SV.W.0160.000000T0000Z-210716T1900Z/
McKean PA-Potter PA-
230 PM EDT Fri Jul 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EDT
FOR EAST CENTRAL MCKEAN AND NORTHWESTERN POTTER COUNTIES...

At 230 PM EDT, a severe thunderstorm was located over Roulette,
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.

This severe storm will be near...
  Coudersport around 300 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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

&&

LAT...LON 4174 7831 4181 7830 4187 7825 4189 7802
      4169 7801
TIME...MOT...LOC 1830Z 271DEG 20KT 4178 7821 

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

Colbert

333 
WWUS51 KCTP 161847
SVSCTP

Severe Weather Statement
National Weather Service State College PA
247 PM EDT Fri Jul 16 2021

PAC083-161857-
/O.CAN.KCTP.SV.W.0160.000000T0000Z-210716T1900Z/
McKean PA-
247 PM EDT Fri Jul 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MCKEAN COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4171 7813 4177 7818 4185 7814 4186 7802
      4169 7801
TIME...MOT...LOC 1847Z 270DEG 21KT 4176 7805 

$$

PAC105-161900-
/O.CON.KCTP.SV.W.0160.000000T0000Z-210716T1900Z/
Potter PA-
247 PM EDT Fri Jul 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EDT
FOR WEST CENTRAL POTTER COUNTY...

At 247 PM EDT, a severe thunderstorm was located over Coudersport,
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.

This severe storm will be near...
  Coudersport around 250 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

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

&&

LAT...LON 4171 7813 4177 7818 4185 7814 4186 7802
      4169 7801
TIME...MOT...LOC 1847Z 270DEG 21KT 4176 7805 

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

Colbert

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 9:40 PM EDT	Special Weather Statement	CTP	Warren	50 min
Jul 16, 1:22 PM EDT	Flood Watch	CTP	Cameron, Clinton, Elk, Lycoming, McKean, Potter and 3 more	21 min
Jul 16, 1:46 PM EDT	Flash Flood Watch	CTP	Adams, Cameron, Clinton, Columbia, Dauphin, Elk and 12 more	32 hr
Jul 16, 1:59 PM EDT	Special Weather Statement	CTP	Montour	31 min
Jul 16, 2:05 PM EDT	Areal Flood Advisory	CTP	Lycoming, Sullivan	2 hr
Jul 16, 2:29 PM EDT	Special Weather Statement	CTP	Montour	31 min
Jul 16, 2:52 PM EDT	Special Weather Statement	CTP	Potter	23 min
Jul 16, 2:59 PM EDT	Areal Flood Advisory	CTP	Columbia, Montour, Northumberland	2 hr
Jul 16, 2:59 PM EDT	Special Weather Statement	CTP	Columbia	31 min
Jul 16, 3:14 PM EDT	Special Weather Statement	CTP	Potter	31 min
Jul 16, 3:19 PM EDT	Special Weather Statement	CTP	Montour	26 min
Jul 16, 3:22 PM EDT	Special Weather Statement	CTP	Juniata, Perry	38 min
Jul 16, 3:54 PM EDT	Special Weather Statement	CTP	Clearfield	36 min
Jul 16, 4:07 PM EDT	Special Weather Statement	CTP	Clearfield	38 min
Jul 16, 4:11 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield	49 min
Jul 16, 4:18 PM EDT	Special Weather Statement	CTP	Tioga	42 min
Jul 16, 4:20 PM EDT	Flash Flood Warning	CTP	Columbia, Montour, Northumberland, Union	85 min
Jul 16, 4:29 PM EDT	Severe Thunderstorm Warning	CTP	Clearfield	46 min
Jul 16, 4:30 PM EDT	Severe Thunderstorm Warning	CTP	Tioga	45 min
Jul 16, 4:47 PM EDT	Severe Thunderstorm Warning	CTP	Lycoming	43 min
Jul 16, 4:57 PM EDT	Special Weather Statement	CTP	Clinton	33 min
Jul 16, 4:59 PM EDT	Areal Flood Advisory	CTP	Lycoming, Tioga	2 hr
Jul 16, 5:10 PM EDT	Areal Flood Advisory	CTP	Sullivan	3 hr
Jul 16, 5:13 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming	32 min
Jul 16, 5:25 PM EDT	Special Weather Statement	CTP	Carbon	20 min
Jul 16, 5:31 PM EDT	Flash Flood Warning	CTP	Sullivan	108 min
Jul 16, 5:32 PM EDT	Special Weather Statement	CTP	Clinton	28 min
Jul 16, 5:44 PM EDT	Special Weather Statement	CTP	Centre	31 min
Jul 16, 6:01 PM EDT	Special Weather Statement	CTP	Centre	29 min
Jul 16, 6:02 PM EDT	Severe Thunderstorm Warning	CTP	Sullivan	45 min
Jul 16, 6:31 PM EDT	Special Weather Statement	CTP	Union	29 min
Jul 16, 6:52 PM EDT	Special Weather Statement	CTP	Columbia	23 min
Jul 16, 6:57 PM EDT	Special Weather Statement	CTP	Union	33 min
Jul 16, 7:15 PM EDT	Areal Flood Advisory	CTP	Columbia, Lycoming, Montour, Northumberland, Snyder, Union	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.