Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 172, NWS Philadelphia/Mount Holly

August 13, 20164 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 13, 2016, 8:16 PM EDT for 4 counties in Pennsylvania. It was in force for 44 min. 1 report 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
Aug 13, 2016, 8:16 PM EDT (00:16 UTC)
Expired
Aug 13, 2016, 9:00 PM EDT
In force
44 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

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

The radar

The Philadelphia radar (KDIX), 107 km from the middle of the area, began a volume at 00:18 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

TimeReportWhereRemark
Aug 13, 8:16 PM EDTTSTM WND DMGUpper Saucon Twp, PAWIRES BLOWN DOWN...TIME ESTIMATED FROM RADAR

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 00:00Z, 0.3 hours before the alert went out and 228 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-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2016-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2471 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2016-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 11 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2471 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
1619 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
11 m²/s²
0-3 km storm-relative helicity
56 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

255 
WUUS51 KPHI 140016
SVRPHI
PAC011-017-077-091-140100-
/O.NEW.KPHI.SV.W.0172.160814T0016Z-160814T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
816 PM EDT SAT AUG 13 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  EAST CENTRAL BERKS COUNTY IN EASTERN PENNSYLVANIA...
  NORTHWESTERN BUCKS COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 900 PM EDT

* AT 815 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER BALLY...OR
  11 MILES SOUTH OF ALLENTOWN...MOVING EAST AT 30 MPH.

  HAZARD...60 MPH WIND GUSTS AND PENNY SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

* LOCATIONS IMPACTED INCLUDE...
  ALLENTOWN...EMMAUS...QUAKERTOWN...PERKASIE...SOUDERTON...
  BEDMINSTER...CHALFONT...HATFIELD...EAST GREENVILLE...DUBLIN...
  BALLY...BECHTELSVILLE...GREEN LANE...PLEASANT VALLEY...GERYVILLE...
  FRICKS...ZIONSVILLE...OTTSVILLE...GILBERTSVILLE AND ANCIENT OAKS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4036 7585 4059 7556 4048 7512 4025 7522
TIME...MOT...LOC 0015Z 282DEG 25KT 4043 7556 

HAIL...0.75IN
WIND...60MPH
 
$$

MWG
2 follow-up statements
755 
WWUS51 KPHI 140046
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
846 PM EDT SAT AUG 13 2016

PAC011-017-077-091-140100-
/O.CON.KPHI.SV.W.0172.000000T0000Z-160814T0100Z/
LEHIGH PA-BERKS PA-BUCKS PA-MONTGOMERY PA-
846 PM EDT SAT AUG 13 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR SOUTHEASTERN LEHIGH...EAST CENTRAL BERKS...NORTHWESTERN BUCKS AND
NORTHWESTERN MONTGOMERY COUNTIES...

AT 846 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER
QUAKERTOWN...OR 14 MILES SOUTHEAST OF ALLENTOWN...MOVING EAST AT 25
MPH.

HAZARD...60 MPH WIND GUSTS AND PENNY SIZE HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

LOCATIONS IMPACTED INCLUDE...
ALLENTOWN...EMMAUS...QUAKERTOWN...PERKASIE...SOUDERTON...
BEDMINSTER...CHALFONT...HATFIELD...EAST GREENVILLE...DUBLIN...
BALLY...BECHTELSVILLE...GREEN LANE...PLEASANT VALLEY...GERYVILLE...
FRICKS...ZIONSVILLE...OTTSVILLE...GILBERTSVILLE AND TELFORD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4033 7569 4058 7550 4048 7512 4025 7522
TIME...MOT...LOC 0046Z 276DEG 22KT 4042 7533 

HAIL...0.75IN
WIND...60MPH
 
$$

MWG
686 
WWUS51 KPHI 140056
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
856 PM EDT SAT AUG 13 2016

PAC011-017-077-091-140105-
/O.EXP.KPHI.SV.W.0172.000000T0000Z-160814T0100Z/
LEHIGH PA-BERKS PA-BUCKS PA-MONTGOMERY PA-
856 PM EDT SAT AUG 13 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LEHIGH...EAST
CENTRAL BERKS...NORTHWESTERN BUCKS AND NORTHWESTERN MONTGOMERY
COUNTIES WILL EXPIRE AT 900 PM EDT...
                
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 WILL BE ALLOWED TO EXPIRE.

LAT...LON 4033 7569 4058 7550 4048 7512 4025 7522
TIME...MOT...LOC 0051Z 282DEG 25KT 4042 7533 

$$

MWG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 8:05 PM EDTSpecial Weather StatementPHINorthampton40 min
Aug 13, 8:27 PM EDTSevere Thunderstorm WarningPHINorthampton48 min
Aug 13, 9:00 PM EDTSpecial Weather StatementPHIBucks45 min
Aug 13, 9:28 PM EDTSpecial Weather StatementPHICarbon, Monroe47 min
Aug 13, 9:55 PM EDTSevere Thunderstorm WarningPHICarbon, Monroe, Northampton50 min
Aug 13, 10:35 PM EDTAreal Flood AdvisoryPHICarbon, Monroe4 hr
Aug 13, 10:46 PM EDTSpecial Weather StatementPHIMonroe44 min
Aug 13, 11:15 PM EDTSevere Thunderstorm WarningPHIMonroe, Northampton45 min
Aug 13, 11:46 PM EDTSpecial Weather StatementPHIMonroe29 min
Aug 14, 12:30 AM EDTSpecial Weather StatementPHIMonroe45 min
Aug 14, 6:24 PM EDTSpecial Weather StatementPHIMonroe51 min
Aug 14, 6:57 PM EDTSpecial Weather StatementPHIBerks48 min
Aug 14, 7:31 PM EDTSpecial Weather StatementPHIMontgomery44 min
Aug 14, 7:56 PM EDTSpecial Weather StatementPHIChester49 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2016Every severe thunderstorm warning in 2016

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.