Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 40, NWS Philadelphia/Mount Holly

May 6, 20254 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 6, 2025, 4:44 PM EDT for 4 counties in Pennsylvania. It was in force for 46 min. 3 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 6, 2025, 4:44 PM EDT (20:44 UTC)
Expired: May 6, 2025, 5:30 PM EDT
In force: 46 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 125 km from the middle of the area, began a volume at 20:45 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 6, 4:46 PM EDT	HAIL 0.25	Emmaus, PA	Videos of pea size hail falling at time of report.
May 6, 5:05 PM EDT	HAIL 1	North Catasauqua, PA	Trained spotter relays report of mostly small sized hail mixed in with some to quarters. Time estimated from radar.
May 6, 5:06 PM EDT	HAIL 0.6	Whitehall Twp, PA	Trained spotter relays 0.6 inch hail measured along with a 32 mph wind gust.

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 6, 1:06 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 8.7 hours before the alert went out and 217 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: 784 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

526 
WUUS51 KPHI 062044
SVRPHI
PAC025-077-089-095-062130-
/O.NEW.KPHI.SV.W.0040.250506T2044Z-250506T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
444 PM EDT Tue May 6 2025

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Eastern Lehigh County in eastern Pennsylvania...
  Southeastern Carbon County in northeastern Pennsylvania...
  Southwestern Monroe County in northeastern Pennsylvania...
  Southwestern Northampton County in eastern Pennsylvania...

* Until 530 PM EDT.

* At 444 PM EDT, a severe thunderstorm was located over Emmaus, or
  near Allentown, moving north at 40 mph.

  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...
  Walnutport, Brodheadsville, Kunkletown, Effort, Gilbert,
  Coffeetown, Hokendauqua, Emmaus, Bath, Zionsville, Rossland,
  Trachsville, Berlinsville, North Catasauqua, Ancient Oaks,
  Catasauqua, Kresgeville, Chapman, Allentown, and Danielsville.

This includes the following highways...
 Northeast Extension between mile markers 47 and 65.
 Interstate 78 in Pennsylvania between mile markers 53 and 62.

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 4093 7526 4047 7545 4048 7559 4096 7563
TIME...MOT...LOC 2044Z 186DEG 33KT 4056 7550 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

3 follow-up statements

798 
WWUS51 KPHI 062101
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
501 PM EDT Tue May 6 2025

PAC025-077-089-095-062130-
/O.CON.KPHI.SV.W.0040.000000T0000Z-250506T2130Z/
Lehigh PA-Carbon PA-Monroe PA-Northampton PA-
501 PM EDT Tue May 6 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR NORTHEASTERN LEHIGH...SOUTHEASTERN CARBON...SOUTHWESTERN MONROE
AND WEST CENTRAL NORTHAMPTON COUNTIES...

At 501 PM EDT, a severe thunderstorm was located over Northampton, or
near Allentown, moving north at 25 mph.

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...
Brodheadsville, Kunkletown, Effort, Gilbert, Coffeetown, Hokendauqua,
Bath, Rossland, Trachsville, Berlinsville, North Catasauqua,
Catasauqua, Kresgeville, Chapman, Allentown, Danielsville, Coplay,
Fullerton, Beltzville State Park, and Saylorsburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

&&

LAT...LON 4093 7526 4058 7543 4060 7557 4096 7563
TIME...MOT...LOC 2101Z 188DEG 20KT 4064 7549 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

438 
WWUS51 KPHI 062120
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
520 PM EDT Tue May 6 2025

PAC025-077-089-095-062130-
/O.CON.KPHI.SV.W.0040.000000T0000Z-250506T2130Z/
Lehigh PA-Carbon PA-Monroe PA-Northampton PA-
520 PM EDT Tue May 6 2025

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR NORTH CENTRAL LEHIGH...SOUTHEASTERN CARBON...SOUTHWESTERN MONROE
AND WEST CENTRAL NORTHAMPTON COUNTIES...

At 520 PM EDT, a severe thunderstorm was located over Danielsville,
or 12 miles east of Lehighton, moving north at 35 mph.

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...
Walnutport, Chapman, Brodheadsville, Danielsville, Kunkletown,
Beltzville State Park, Effort, Saylorsburg, Gilbert, Bath, Rossland,
Trachsville, Berlinsville, Fiddletown, Penn Forest Reservoir,
Beersville, Kresgeville, Palmerton, and Northampton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

&&

LAT...LON 4069 7540 4071 7559 4096 7563 4093 7526
      4089 7528
TIME...MOT...LOC 2120Z 184DEG 29KT 4078 7549 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Staarmann

365 
WWUS51 KPHI 062136
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
536 PM EDT Tue May 6 2025

PAC025-077-089-095-062146-
/O.EXP.KPHI.SV.W.0040.000000T0000Z-250506T2130Z/
Lehigh PA-Carbon PA-Monroe PA-Northampton PA-
536 PM EDT Tue May 6 2025

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL LEHIGH...
SOUTHEASTERN CARBON...SOUTHWESTERN MONROE AND WEST CENTRAL
NORTHAMPTON COUNTIES HAS EXPIRED...

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 allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
eastern and northeastern Pennsylvania.

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

LAT...LON 4069 7540 4071 7559 4096 7563 4093 7526
      4089 7528
TIME...MOT...LOC 2136Z 186DEG 33KT 4091 7547 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
May 6, 1:08 PM EDT	Severe Thunderstorm Warning	PHI	Berks	37 min
May 6, 1:31 PM EDT	Severe Thunderstorm Warning	PHI	Chester	44 min
May 6, 2:12 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	48 min
May 6, 2:46 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh	59 min
May 6, 3:41 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	49 min
May 6, 3:57 PM EDT	Tornado Warning	PHI	Monroe, Northampton	33 min
May 6, 4:18 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	57 min
May 6, 4:19 PM EDT	Tornado Warning	PHI	Monroe	26 min
May 6, 4:31 PM EDT	Tornado Warning	PHI	Monroe	44 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2025 Every severe thunderstorm warning in 2025

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.