Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 9, NWS Philadelphia/Mount Holly

February 25, 2017Carbon County, Lehigh County, Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 25, 2017, 4:05 PM EST for Carbon County, Lehigh County, Monroe County, Pennsylvania. It was in force for 40 min. 5 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: Feb 25, 2017, 4:05 PM EST (21:05 UTC)
Expired: Feb 25, 2017, 4:45 PM EST
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Carbon County, PA, Lehigh County, PA, Monroe County, PA

The radar

The Binghamton radar (KBGM), 142 km from the middle of the area, began a volume at 21:08 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
Feb 25, 4:06 PM EST	TSTM WND DMG	Parryville, PA	SOME TREES DOWN IN PORTIONS OF CARBON COUNTY...ESPECIALLY FROM NEAR PARRYVILLE NORTHEASTWARD. TIME ESTIMATED FROM RADAR.
Feb 25, 4:08 PM EST	HAIL 0.5	Lake Harmony, PA	1 DEEP AND SHOVELING SEVERAL HRS AFTER PRIMARY EVENT.
Feb 25, 4:08 PM EST	HAIL 0.5	Lake Harmony, PA	1 INCH DEEP AND SHOVELING SEVERAL HRS AFTER PRIMARY EVENT.
Feb 25, 4:23 PM EST	TSTM WND GST 51	Pocono Mountains Airpor, PA
Feb 25, 4:31 PM EST	HAIL 0.25	Albrightsville, PA

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
Feb 25, 2:46 PM EST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.1 hours before the alert went out and 227 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: 576 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

690 
WUUS51 KPHI 252105
SVRPHI
PAC025-077-089-252145-
/O.NEW.KPHI.SV.W.0009.170225T2105Z-170225T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
405 PM EST SAT FEB 25 2017

The National Weather Service in Mount Holly NJ  has issued a

* Severe Thunderstorm Warning for...
  Northwestern Lehigh County in eastern Pennsylvania...
  Carbon County in northeastern Pennsylvania...
  Western Monroe County in northeastern Pennsylvania...

* Until 445 PM EST

* At 405 PM EST, severe thunderstorms were located along a line
  extending from near Jordan Valley to near Lehighton to New
  Mahoning, moving northeast at 35 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Severe thunderstorms will be near,
  Lehighton and Jim Thorpe around 410 PM EST. 
  Palmerton and Beltzville State Park around 420 PM EST. 
  Christmans around 425 PM EST. 
  Penn Forest Reservoir around 430 PM EST. 
  Kresgeville, Meckesville, Jonas and Albrightsville around 435 PM 
  EST. 
  Gilbert, Sun Valley, Lake Harmony and Blakeslee around 440 PM EST. 
  Brodheadsville, Long Pond, McMichael, Pocono Raceway, Reeders, 
  Tannersville, Scotrun and Pocono Pines around 445 PM EST. 

Other locations impacted by these severe thunderstorms include
Trachsville, Weissport, Parryville, Weissport East, Merwinsburg,
Effort, Summit Hill and Bowmanstown.

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.

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

&&

LAT...LON 4107 7526 4093 7533 4080 7558 4079 7560
      4069 7577 4073 7578 4074 7576 4082 7589
      4123 7554 4122 7551 4123 7551 4123 7545
TIME...MOT...LOC 2105Z 227DEG 30KT 4072 7576 4079 7572 4081 7579 

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

DRAG

2 follow-up statements

471 
WWUS51 KPHI 252123
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
423 PM EST SAT FEB 25 2017

PAC077-252131-
/O.CAN.KPHI.SV.W.0009.000000T0000Z-170225T2145Z/
Lehigh PA-
423 PM EST SAT FEB 25 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN LEHIGH COUNTY IS
CANCELLED...

The storms which prompted the warning have moved west of the warned 
area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until 900 PM EST for
eastern and northeastern Pennsylvania.

LAT...LON 4107 7526 4093 7533 4080 7558 4079 7560
      4093 7570 4107 7552 4123 7545
TIME...MOT...LOC 2121Z 231DEG 38KT 4081 7560 4088 7556 4090 7563 

$$

PAC025-089-252145-
/O.CON.KPHI.SV.W.0009.000000T0000Z-170225T2145Z/
Carbon PA-Monroe PA-
423 PM EST SAT FEB 25 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EST
FOR SOUTHEASTERN CARBON AND WESTERN MONROE COUNTIES...

At 421 PM EST, severe thunderstorms were located along a line
extending from Palmerton to near Beltzville State Park to near Penn
Forest Reservoir, moving northeast at 45 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

These severe storms will be near...
  Kresgeville and Penn Forest Reservoir around 425 PM EST. 
  Jonas and Meckesville around 430 PM EST. 
  Gilbert, Sun Valley and McMichael around 435 PM EST. 
  Brodheadsville, Reeders, Long Pond and Pocono Raceway around 440 
  PM EST. 
  Mount Pocono, Tannersville, Scotrun and Pocono Pines around 445 PM 
  EST. 

Other locations impacted by these severe thunderstorms include
Trachsville, Merwinsburg and Effort.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4107 7526 4093 7533 4080 7558 4079 7560
      4093 7570 4107 7552 4123 7545
TIME...MOT...LOC 2121Z 231DEG 38KT 4081 7560 4088 7556 4090 7563 

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

DRAG

070 
WWUS51 KPHI 252138
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
438 PM EST SAT FEB 25 2017

PAC025-089-252147-
/O.EXP.KPHI.SV.W.0009.000000T0000Z-170225T2145Z/
Carbon PA-Monroe PA-
438 PM EST SAT FEB 25 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CARBON AND
WESTERN MONROE COUNTIES WILL EXPIRE AT 445 PM EST...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.

A severe thunderstorm watch remains in effect until 900 PM EST for
eastern and northeastern Pennsylvania.

LAT...LON 4107 7526 4093 7533 4080 7558 4079 7560
      4093 7570 4107 7552 4123 7545
TIME...MOT...LOC 2137Z 270DEG 30KT 4089 7548 4096 7544 4098 7551 

$$

DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 25, 2:22 PM EST	Special Weather Statement	PHI	Lebanon	53 min
Feb 25, 2:47 PM EST	Severe Thunderstorm Warning	PHI	Berks	43 min
Feb 25, 2:55 PM EST	Special Weather Statement	PHI	Carbon	50 min
Feb 25, 3:02 PM EST	Special Weather Statement	PHI	Berks	58 min
Feb 25, 3:19 PM EST	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Northampton	41 min
Feb 25, 3:26 PM EST	Severe Thunderstorm Warning	PHI	Berks, Chester	64 min
Feb 25, 3:57 PM EST	Special Weather Statement	PHI	Lehigh, Montgomery	48 min
Feb 25, 4:04 PM EST	Severe Thunderstorm Warning	PHI	Chester, Delaware	41 min
Feb 25, 4:17 PM EST	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Lehigh, Monroe and 3 more	43 min
Feb 25, 4:34 PM EST	Special Weather Statement	PHI	Monroe	41 min
Feb 25, 4:40 PM EST	Severe Thunderstorm Warning	PHI	Delaware, Montgomery, Philadelphia	50 min
Feb 25, 4:54 PM EST	Severe Thunderstorm Warning	PHI	Bucks, Monroe	51 min
Feb 25, 5:01 PM EST	Special Weather Statement	PHI	Bucks	44 min
Feb 25, 5:17 PM EST	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	43 min
Feb 25, 6:10 PM EST	Special Weather Statement	PHI	Delaware	35 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.