Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 40, NWS Philadelphia/Mount Holly

May 19, 2019Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 19, 2019, 11:54 PM EDT for Lehigh County, Northampton County, Pennsylvania. It was in force for 39 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: May 19, 2019, 11:54 PM EDT (03:54 UTC)
Expired: May 20, 2019, 12:33 AM EDT
In force: 39 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 112 km from the middle of the area, began a volume at 03:56 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 nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 3.9 hours before the alert went out and 198 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: 61 J/kg
Mixed-layer CIN: -284 J/kg
Mixed-layer LCL: 581 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

375 
WUUS51 KPHI 200354
SVRPHI
PAC077-095-200500-
/O.NEW.KPHI.SV.W.0040.190520T0354Z-190520T0500Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1154 PM EDT Sun May 19 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Lehigh County in eastern Pennsylvania...
  Northampton County in eastern Pennsylvania...

* Until 100 AM EDT.

* At 1152 PM EDT, a severe thunderstorm was located over Tatamy, or 
  near Easton, moving northeast at 45 mph. Another storm was located 
  in western Lehigh County just north of Alburtis.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Allentown, Easton, Bethlehem, Forks, Emmaus, Northampton, Wilson,
  Hellertown, Nazareth, Bangor, Pen Argyl, Wind Gap, Bath, Belfast,
  West Easton, Tatamy, East Bangor, Steuben, Glendon and Coffeetown.

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 this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4085 7507 4085 7510 4082 7508 4077 7513
      4078 7517 4075 7519 4073 7518 4070 7520
      4068 7518 4043 7550 4057 7572 4094 7514
TIME...MOT...LOC 0352Z 242DEG 57KT 4075 7527 

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

JJM

1 follow-up statement

420 
WWUS51 KPHI 200433
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1233 AM EDT Mon May 20 2019

PAC077-095-200442-
/O.CAN.KPHI.SV.W.0040.000000T0000Z-190520T0500Z/
Lehigh PA-Northampton PA-
1233 AM EDT Mon May 20 2019

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LEHIGH AND
NORTHAMPTON COUNTIES IS CANCELLED...
                
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 has been cancelled.  However small hail 
and heavy rain is still possible with this thunderstorm.

LAT...LON 4085 7507 4085 7510 4082 7508 4077 7513
      4078 7517 4075 7519 4073 7518 4070 7520
      4068 7518 4043 7550 4057 7572 4094 7514
TIME...MOT...LOC 0431Z 242DEG 57KT 4102 7460 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 8:14 PM EDT	Special Weather Statement	PHI	Lehigh	46 min
May 19, 8:35 PM EDT	Tornado Warning	PHI	Berks	25 min
May 19, 8:37 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Montgomery	38 min
May 19, 8:43 PM EDT	Flash Flood Warning	PHI	Berks	3 hr
May 19, 9:09 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	51 min
May 19, 9:29 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	4 hr
May 19, 9:46 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery, Northampton	44 min
May 19, 10:27 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	48 min
May 19, 10:34 PM EDT	Areal Flood Advisory	PHI	Bucks, Lehigh, Northampton	3 hr
May 19, 10:48 PM EDT	Flash Flood Warning	PHI	Berks	117 min
May 19, 11:00 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	60 min
May 19, 11:15 PM EDT	Flash Flood Warning	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
May 19, 11:41 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	53 min
May 20, 12:57 AM EDT	Areal Flood Advisory	PHI	Berks	3 hr
May 20, 1:21 AM EDT	Areal Flood Advisory	PHI	Berks, Montgomery	3 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Every severe thunderstorm warning in 2019

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.