Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 107, NWS Philadelphia/Mount Holly

July 20, 2017Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 20, 2017, 5:37 PM EDT for Monroe County, Pennsylvania. It was in force for 53 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: Jul 20, 2017, 5:37 PM EDT (21:37 UTC)
Expired: Jul 20, 2017, 6:30 PM EDT
In force: 53 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Monroe County, PA

The radar

The Philadelphia radar (KDIX), 140 km from the middle of the area, began a volume at 21:38 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 20, 6:15 PM EDT	TSTM WND DMG	Blakeslee, PA	SEVERAL TREES DOWN ON ROUTE 940 FROM BLAKESLEE WESTWARD TO MOOSEY WOOD ROAD. TIME APPROXIMATED 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
Jul 20, 5:03 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.6 hours before the alert went out and 197 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: 14 J/kg
Mixed-layer CIN: -148 J/kg
Mixed-layer LCL: 1647 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

458 
WUUS51 KPHI 202137
SVRPHI
PAC089-202230-
/O.NEW.KPHI.SV.W.0107.170720T2137Z-170720T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
537 PM EDT THU JUL 20 2017

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Monroe County in northeastern Pennsylvania...

* Until 630 PM EDT

* At 537 PM EDT, a severe thunderstorm was located over Mount Cobb,
  or 9 miles east of Scranton, moving southeast at 40 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* This severe thunderstorm will be near,
  Skytop around 605 PM EDT. 
  Mountainhome and Canadensis around 610 PM EDT. 
  Werry Lake and Echo Lake around 630 PM EDT. 

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4115 7515 4114 7509 4108 7503 4109 7497
      4104 7503 4099 7513 4097 7512 4095 7515
      4093 7522 4090 7524 4085 7534 4112 7565
      4123 7554 4125 7513
TIME...MOT...LOC 2137Z 309DEG 34KT 4143 7550 

HAIL...<.75IN
WIND...60MPH
 
$$

Robertson

1 follow-up statement

652 
WWUS51 KPHI 202207
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
607 PM EDT THU JUL 20 2017

PAC089-202230-
/O.CON.KPHI.SV.W.0107.000000T0000Z-170720T2230Z/
Monroe PA-
607 PM EDT THU JUL 20 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR MONROE COUNTY...

At 607 PM EDT, severe thunderstorms were located along a line
extending from near Narrowsburg to near Greentown to near Arrowhead
Lake, moving southeast at 35 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

These severe storms will be near...
  Skytop, Mountainhome and Canadensis around 615 PM EDT. 
  Gouldsboro State Park around 620 PM EDT. 
  Tobyhanna around 625 PM EDT. 
  Mount Pocono, Pocono Pines, Long Pond, Pocono Raceway, Scotrun, 
  McMichael, Tannersville, Reeders and Paradise Valley around 630 PM 
  EDT. 

Other locations impacted by these severe thunderstorms include
Cresco, Marshalls Creek, Arlington Heights, Hidden Lake, Merwinsburg,
Stroudsburg, Effort, Bartonsville and Shawnee.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to large hail and damaging winds...frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember...if you can hear thunder...you are close
enough to be struck by lightning.

&&

LAT...LON 4115 7515 4114 7509 4108 7503 4109 7497
      4104 7503 4099 7513 4097 7512 4095 7515
      4093 7522 4090 7524 4085 7534 4112 7565
      4123 7554 4125 7513
TIME...MOT...LOC 2207Z 304DEG 30KT 4156 7513 4130 7525 4121 7564 

HAIL...<.75IN
WIND...60MPH
 
$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 3:43 AM EDT	Heat Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	15 hr
Jul 20, 5:35 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	55 min
Jul 20, 6:22 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	53 min
Jul 20, 6:24 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	66 min
Jul 20, 7:00 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Carbon, Lehigh, Northampton	60 min
Jul 20, 7:52 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	53 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2017 Every severe thunderstorm warning 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.