Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 78, NWS Philadelphia/Mount Holly

May 29, 20195 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 29, 2019, 2:30 PM EDT for 5 counties in Pennsylvania. It was in force for 60 min. 16 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: May 29, 2019, 2:30 PM EDT (18:30 UTC)
Expired: May 29, 2019, 3:30 PM EDT
In force: 60 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Berks County, PA, Bucks County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 126 km from the middle of the area, began a volume at 18:33 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
May 29, 2:45 PM EDT	HAIL 1	Trexlertown, PA
May 29, 2:50 PM EDT	HAIL 2	Mertztown, PA	HAIL UP TO 2 INCHES REPORTED IN MERTZTOWN.
May 29, 2:52 PM EDT	HAIL 0.75	Kutztown, PA
May 29, 2:53 PM EDT	HAIL 1.75	Breinigsville, PA	TIME ESTIMATED FROM RADAR.
May 29, 3:00 PM EDT	HAIL 1	Breinigsville, PA
May 29, 3:00 PM EDT	HAIL 1.25	Emmaus, PA
May 29, 3:05 PM EDT	HAIL 0.25	Trexlertown, PA
May 29, 3:06 PM EDT	HAIL 0.75	Trexlertown, PA
May 29, 3:08 PM EDT	HAIL 1.75	Macungie, PA
May 29, 3:14 PM EDT	HAIL 1.75	Vera Cruz, PA	TIME ESTIMATED FROM RADAR.
May 29, 3:14 PM EDT	TORNADO	2 Nnw Geryville, PA	NWS STORM SURVEY CONFIRMED AN EF-0 TORNADO DEVELOPED IN LOWER MILFORD TWP IN LEHIGH COUNTY. TREES WERE SNAPPED AND UPROOTED ALONG ITS 2.3 MILE PATH INTO NORTHERN MILFORD TWP IN BUCKS COUNTY. MAXIMUM ESTIMATED WINDS OF 80 MPH.
May 29, 3:15 PM EDT	HAIL 1.5	Emmaus, PA
May 29, 3:19 PM EDT	HAIL 1	Upper Saucon Twp, PA	TIME ESTIMATED FROM RADAR.
May 29, 3:20 PM EDT	HAIL 1	Quakertown, PA
May 29, 3:21 PM EDT	HAIL 2	Coopersburg, PA	PHOTOS OF HAIL LARGER THAN GOLF BALLS IN COOPERSBURG. TIME ESTIMATED FROM RADAR.
May 29, 3:26 PM EDT	HAIL 2	5 Sw Pleasant Valley, PA	HAIL FELL FOR APPROX 10 MINUTES. WIDESPREAD QUARTER TO HALF DOLLAR SIZED HAIL WITH 2 INCH HAIL INCLUDED.

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
May 29, 1:10 PM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.5 hours before the alert went out and 229 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: 292 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 1463 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

471 
WUUS51 KPHI 291830
SVRPHI
PAC011-017-077-091-095-291930-
/O.NEW.KPHI.SV.W.0078.190529T1830Z-190529T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
230 PM EDT Wed May 29 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northeastern Berks County in eastern Pennsylvania...
  North central Montgomery County in southeastern Pennsylvania...
  Lehigh County in eastern Pennsylvania...
  Northwestern Bucks County in southeastern Pennsylvania...
  Southwestern Northampton County in eastern Pennsylvania...

* Until 330 PM EDT.

* At 230 PM EDT, a severe thunderstorm was located near
  Lenhartsville, or 15 miles north of Reading, moving east at 30 mph.

  HAZARD...60 mph wind gusts and half dollar 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, Emmaus, Northampton, Quakertown,
  Perkasie, Hellertown, Nazareth, Kutztown, Fleetwood, East
  Greenville, Bath, Topton, Shoemakersville, Tatamy, Bally, Steuben,
  Lyons and Lenhartsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect until 800 PM EDT for eastern and
southeastern Pennsylvania.

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted, act quickly and move to a
place of safety inside a sturdy structure such as a basement or small
interior room.

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

&&

LAT...LON 4047 7597 4064 7595 4075 7526 4032 7527
TIME...MOT...LOC 1830Z 273DEG 26KT 4054 7584 

HAIL...1.25IN
WIND...60MPH
 
$$

Iovino

1 follow-up statement

293 
WWUS51 KPHI 291852
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
252 PM EDT Wed May 29 2019

PAC011-017-077-091-095-291930-
/O.CON.KPHI.SV.W.0078.000000T0000Z-190529T1930Z/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Northampton PA-
252 PM EDT Wed May 29 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR NORTHEASTERN BERKS...NORTH CENTRAL MONTGOMERY...LEHIGH...
NORTHWESTERN BUCKS AND SOUTHWESTERN NORTHAMPTON COUNTIES...

At 252 PM EDT, a severe thunderstorm was located over Ancient Oaks,
or 8 miles southwest of Allentown, moving east at 30 mph.

HAZARD...Two inch hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Allentown, Easton, Bethlehem, Emmaus, Northampton, Quakertown,
Perkasie, Hellertown, Nazareth, Kutztown, East Greenville, Topton,
Tatamy, Steuben, Lyons, Pleasant Valley, Coffeetown, Zionsville,
Ancient Oaks and Lehigh University.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect until 800 PM EDT for eastern and
southeastern Pennsylvania.

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.

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

&&

LAT...LON 4048 7579 4063 7577 4075 7526 4032 7527
TIME...MOT...LOC 1852Z 273DEG 26KT 4053 7563 

HAIL...2.00IN
WIND...70MPH
 
$$

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 8:23 PM EDT	Tornado Warning	PHI	Monroe	37 min
May 28, 9:17 PM EDT	River Flood Warning	PHI	Chester	101 min
May 29, 3:18 AM EDT	Flash Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	18 hr
May 29, 2:19 PM EDT	Special Weather Statement	PHI	Lehigh	41 min
May 29, 2:26 PM EDT	Special Weather Statement	PHI	Montgomery	34 min
May 29, 2:48 PM EDT	Special Weather Statement	PHI	Monroe	27 min
May 29, 2:59 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	46 min
May 29, 3:10 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	65 min
May 29, 3:17 PM EDT	Tornado Warning	PHI	Bucks, Lehigh	28 min
May 29, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	46 min
May 29, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	46 min
May 29, 3:38 PM EDT	Tornado Warning	PHI	Bucks	37 min
May 29, 3:43 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe	4 hr
May 29, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	62 min
May 29, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	47 min
May 29, 4:04 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	41 min
May 29, 4:09 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	51 min
May 29, 4:13 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	47 min
May 29, 4:16 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	27 min
May 29, 4:18 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	42 min
May 29, 4:27 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	51 min
May 29, 4:35 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	25 min
May 29, 4:42 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	48 min
May 29, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Chester, Lehigh, Montgomery, Northampton	40 min
May 29, 4:53 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	67 min
May 29, 4:55 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	4 hr
May 29, 5:08 PM EDT	Tornado Warning	PHI	Bucks, Montgomery	27 min
May 29, 5:14 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Carbon, Lehigh, Monroe, Northampton	3 hr
May 29, 5:23 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Monroe, Montgomery and 1 more	34 min
May 29, 5:27 PM EDT	Flash Flood Warning	PHI	Bucks, Chester, Montgomery, Philadelphia	4 hr
May 29, 5:33 PM EDT	Tornado Warning	PHI	Bucks	27 min
May 29, 5:39 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	66 min
May 29, 5:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	41 min
May 29, 6:06 PM EDT	Flash Flood Warning	PHI	Bucks	4 hr
May 29, 6:06 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	24 min
May 29, 6:22 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	53 min
May 29, 6:35 PM EDT	Flash Flood Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	3 hr
May 29, 7:12 PM EDT	Areal Flood Advisory	PHI	Chester	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.