Alert archive / Pennsylvania / Tornado Warnings in 2017

Tornado Warning 12, NWS Philadelphia/Mount Holly

August 22, 2017Monroe County, Northampton County, Pennsylvania; Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this tornado warning at Aug 22, 2017, 8:15 PM EDT for Monroe County, Northampton County, Pennsylvania; Warren County, New Jersey. It was in force for 30 min. 1 report 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: Aug 22, 2017, 8:15 PM EDT (00:15 UTC)
Expired: Aug 22, 2017, 8:45 PM EDT
In force: 30 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Warren County, NJ, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 126 km from the middle of the area, began a volume at 00:17 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
Aug 22, 8:30 PM EDT	TSTM WND DMG	Bartonsville, PA	TREES DOWN IN SEVERAL LOCATIONS IN MONROE COUNTY. TIME ESTIMATED FROM RADAR.

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
Aug 22, 4:19 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.3 hours before the alert went out and 191 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: 1278 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 845 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 220 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 4.6

Open this sounding in Storm Lab

The text

As transmitted.

318 
WFUS51 KPHI 230015
TORPHI
NJC041-PAC089-095-230045-
/O.NEW.KPHI.TO.W.0012.170823T0015Z-170823T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
815 PM EDT TUE AUG 22 2017

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  Northern Warren County in northwestern New Jersey...
  Southeastern Monroe County in northeastern Pennsylvania...
  Northeastern Northampton County in eastern Pennsylvania...

* Until 845 PM EDT
    
* At 815 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Gilbert, or 14 miles south of Mount Pocono, moving
  east at 40 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Saylorsburg around 820 PM EDT. 
  Bangor, Pen Argyl and Stormville around 830 PM EDT. 
  East Bangor around 835 PM EDT. 
  East Stroudsburg, Delaware Water Gap, Delaware Water Gap and 
  Columbia around 840 PM EDT. 
  Blairstown, Hope, Echo Lake and Werry Lake around 845 PM EDT. 

Other locations impacted by this tornadic thunderstorm include
Portland, Marshalls Creek, Arlington Heights, Roseto, Hidden Lake,
Merwinsburg, Stroudsburg, Effort, Bartonsville and Shawnee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4090 7486 4086 7543 4097 7548 4109 7502
TIME...MOT...LOC 0015Z 254DEG 35KT 4092 7543 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

MWG

2 follow-up statements

506 
WWUS51 KPHI 230034
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
834 PM EDT TUE AUG 22 2017

PAC095-230044-
/O.CAN.KPHI.TO.W.0012.000000T0000Z-170823T0045Z/
Northampton PA-
834 PM EDT TUE AUG 22 2017

...THE TORNADO WARNING FOR NORTHEASTERN NORTHAMPTON COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until midnight EDT for
northwestern New Jersey...and eastern and northeastern Pennsylvania.

LAT...LON 4098 7499 4096 7512 4096 7513 4095 7514
      4092 7533 4098 7538 4109 7503 4108 7502
TIME...MOT...LOC 0034Z 245DEG 23KT 4098 7527 

$$

NJC041-PAC089-230045-
/O.CON.KPHI.TO.W.0012.000000T0000Z-170823T0045Z/
Warren NJ-Monroe PA-
834 PM EDT TUE AUG 22 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM EDT FOR
NORTHWESTERN WARREN AND EAST CENTRAL MONROE COUNTIES...
    
At 834 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Stormville, or 10 miles southeast of Mount Pocono,
moving northeast at 25 mph.

HAZARD...Tornado and quarter size hail. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This dangerous storm will be near...
  East Stroudsburg, Delaware Water Gap, Delaware Water Gap and Echo 
  Lake around 845 PM EDT. 

Other locations impacted by this tornadic thunderstorm include
Shawnee, Marshalls Creek, Arlington Heights, Hidden Lake, Stroudsburg
and Bartonsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4098 7499 4096 7512 4096 7513 4095 7514
      4092 7533 4098 7538 4109 7503 4108 7502
TIME...MOT...LOC 0034Z 245DEG 23KT 4098 7527 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

MWG

588 
WWUS51 KPHI 230044
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
844 PM EDT TUE AUG 22 2017

NJC041-PAC089-230054-
/O.EXP.KPHI.TO.W.0012.000000T0000Z-170823T0045Z/
Warren NJ-Monroe PA-
844 PM EDT TUE AUG 22 2017

...THE TORNADO WARNING FOR NORTHWESTERN WARREN AND EAST CENTRAL
MONROE COUNTIES WILL EXPIRE AT 845 PM EDT...
    
The tornado threat has diminished and the Tornado Warning has been 
allowed to expire. However, large hail and damaging winds remain 
likely and a Severe Thunderstorm Warning remains in effect for the 
area.

A severe thunderstorm watch remains in effect until midnight EDT for
northwestern New Jersey...and eastern and northeastern Pennsylvania.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
in Mount Holly NJ.

LAT...LON 4098 7499 4096 7512 4096 7513 4095 7514
      4092 7533 4098 7538 4109 7503 4108 7502
TIME...MOT...LOC 0044Z 254DEG 35KT 4100 7518 

$$

CMS

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 22, 8:12 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	48 min
Aug 22, 8:45 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	60 min
Aug 22, 8:58 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	24 min
Aug 22, 9:18 PM EDT	Areal Flood Advisory	PHI	Berks, Montgomery	4 hr
Aug 22, 9:23 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	52 min
Aug 22, 9:40 PM EDT	Tornado Warning	PHI	Berks, Chester, Montgomery	20 min
Aug 22, 9:42 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	48 min
Aug 22, 10:07 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia	53 min
Aug 22, 10:27 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	48 min
Aug 22, 10:37 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	4 hr
Aug 22, 10:40 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Aug 22, 10:58 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	62 min
Aug 22, 11:46 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	44 min
Aug 23, 12:06 AM EDT	Flash Flood Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	4 hr
Aug 23, 12:29 AM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	46 min
Aug 23, 4:02 AM EDT	Areal Flood Warning	PHI	Chester, Delaware, Philadelphia	4 hr
Aug 22, 8:20 PM EDT	Special Weather Statement	PHI	Sussex	40 min
Aug 22, 10:13 PM EDT	Special Marine Warning	PHI		92 min
Aug 22, 11:39 PM EDT	Special Marine Warning	PHI		66 min
Aug 22, 11:42 PM EDT	Flash Flood Warning	PHI	Hunterdon, Middlesex, Somerset	4 hr
Aug 23, 12:37 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 1 more	4 hr
Aug 23, 1:56 AM EDT	Areal Flood Advisory	PHI	Salem	4 hr
Aug 23, 2:43 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Ocean and 1 more	4 hr
Aug 23, 3:37 AM EDT	Areal Flood Warning	PHI	Hunterdon, Middlesex, Somerset	4 hr

Nearby

Tornado Warnings in Pennsylvania, 2017 Tornado Warnings in New Jersey, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.