Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 130, NWS Philadelphia/Mount Holly

July 24, 2017Berks County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 24, 2017, 5:31 PM EDT for Berks County, Lehigh County, Pennsylvania. It was in force for 59 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: Jul 24, 2017, 5:31 PM EDT (21:31 UTC)
Expired: Jul 24, 2017, 6:30 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 70.0 mph

Counties Berks County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 141 km from the middle of the area, began a volume at 21:34 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 24, 6:10 PM EDT	TSTM WND DMG	Trexler, PA	TREES DOWNED IN SEVERAL LOCATIONS ALONG WITH DAMAGE TO A BASEBALL FENCE AND NURSING HOME.
Jul 24, 6:22 PM EDT	TSTM WND DMG	5 Wsw Allentown, PA	SEVERAL TREES DOWNED DUE TO THUNDERSTORM WINDS.
Jul 24, 6:29 PM EDT	TSTM WND DMG	Upper Macungie Twp, PA	SEVEREAL TREES UPROOTED.
Jul 24, 6:30 PM EDT	TSTM WND DMG	Alton Park, PA	A LARGE MAPLE TREE WAS UPROOTED AND DENTED THE GUTTER ON A HOME AND CRUSHED SOME BUSHES.
Jul 24, 6:30 PM EDT	TSTM WND DMG	Longswamp, PA	TREES DOWN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.5 hours before the alert went out and 226 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: 57 J/kg
Mixed-layer CIN: -164 J/kg
Mixed-layer LCL: 1219 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: -82 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

949 
WUUS51 KPHI 242131
SVRPHI
PAC011-077-242230-
/O.NEW.KPHI.SV.W.0130.170724T2131Z-170724T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service MOUNT HOLLY NJ
531 PM EDT MON JUL 24 2017

The National Weather Service in MOUNT HOLLY NJ  has issued a

* Severe Thunderstorm Warning for...
  Northeastern Berks County in eastern Pennsylvania...
  Central Lehigh County in eastern Pennsylvania...

* Until 630 PM EDT

* At 530 PM EDT, a severe thunderstorm was located over McKeansburg,
  or 7 miles south of Tamaqua, moving southeast at 30 mph.

  HAZARD...70 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. This storm also has a history of 
           producing damge in Schuylkill County.

  IMPACT...Minor damage to vehicles is possible. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings. 

* Locations impacted include...
  Allentown, Emmaus, Kutztown, Hamburg, Fleetwood, Topton,
  Bechtelsville, Lyons, Lenhartsville, Wanamakers, New Tripoli,
  Ancient Oaks, Claussville, Macungie and Alburtis.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

&&

LAT...LON 4063 7600 4065 7598 4072 7580 4059 7542
      4033 7567 4058 7601
TIME...MOT...LOC 2130Z 298DEG 26KT 4069 7599 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

amc

1 follow-up statement

994 
WWUS51 KPHI 242151
SVSPHI

Severe Weather Statement
National Weather Service MOUNT HOLLY NJ
551 PM EDT MON JUL 24 2017

PAC011-077-242230-
/O.CON.KPHI.SV.W.0130.000000T0000Z-170724T2230Z/
Berks PA-Lehigh PA-
551 PM EDT MON JUL 24 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR NORTHEASTERN BERKS AND CENTRAL LEHIGH COUNTIES...

At 550 PM EDT, a severe thunderstorm was located over Wanamakers, or
12 miles southeast of Tamaqua, moving east-southeast at 30 mph.

HAZARD...70 mph wind gusts and ping pong ball size hail. 

SOURCE...Radar indicated. 

IMPACT...People and animals outdoors may 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, Emmaus, Kutztown, Topton, Bechtelsville, Lyons,
Lenhartsville, Wanamakers, New Tripoli, Ancient Oaks, Claussville,
Macungie and Alburtis.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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 4065 7598 4072 7580 4059 7542 4033 7567
TIME...MOT...LOC 2150Z 291DEG 25KT 4066 7583 

TORNADO...POSSIBLE
HAIL...1.50IN
WIND...70MPH
 
$$

amc

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 1:33 AM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	5 hr
Jul 24, 2:34 AM EDT	Severe Thunderstorm Warning	PHI	Delaware, Philadelphia	41 min
Jul 24, 3:00 AM EDT	Flash Flood Warning	PHI	Delaware, Montgomery, Philadelphia	4 hr
Jul 24, 3:17 AM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Monroe, Montgomery, Northampton	118 min
Jul 24, 3:21 AM EDT	Areal Flood Advisory	PHI	Bucks	3 hr
Jul 24, 3:36 AM EDT	Areal Flood Advisory	PHI	Monroe, Northampton	6 hr
Jul 24, 3:47 AM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Monroe, Northampton	118 min
Jul 24, 5:23 PM EDT	Special Weather Statement	PHI	Berks	37 min
Jul 24, 6:15 PM EDT	Special Weather Statement	PHI	Berks	45 min
Jul 24, 6:30 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery	60 min
Jul 24, 6:43 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	4 hr
Jul 24, 6:47 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Jul 24, 7:07 PM EDT	Areal Flood Advisory	PHI	Northampton	113 min
Jul 24, 7:07 PM EDT	Special Weather Statement	PHI	Berks	23 min
Jul 24, 7:12 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	2 hr
Jul 24, 7:16 PM EDT	Areal Flood Advisory	PHI	Berks, Montgomery	119 min
Jul 24, 7:23 PM EDT	Flash Flood Warning	PHI	Bucks, Lehigh, Montgomery	4 hr
Jul 24, 7:26 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery	49 min
Jul 24, 7:42 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Montgomery	2 hr
Jul 24, 7:48 PM EDT	Areal Flood Advisory	PHI	Bucks	117 min
Jul 24, 7:50 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery, Philadelphia	25 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.