Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 191, NWS Philadelphia/Mount Holly

October 30, 2016Berks County, Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 30, 2016, 5:20 PM EDT for Berks County, Chester County, Pennsylvania. It was in force for 25 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
Oct 30, 2016, 5:20 PM EDT (21:20 UTC)
Expired
Oct 30, 2016, 5:45 PM EDT
In force
25 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Berks County, PA, Chester County, PA

The radar

The Philadelphia radar (KDIX), 102 km from the middle of the area, began a volume at 21:21 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
Oct 30, 5:45 PM EDTTSTM WND DMGBerwyn, PAA LARGE NUMBER OF TREES REPORTED DOWN IN THE BERWYN AREA.

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, 9.3 hours before the alert went out and 199 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 12:00Z on 2016-10-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2016-10-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1691 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
142 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

313 
WUUS51 KPHI 302120
SVRPHI
PAC011-029-302145-
/O.NEW.KPHI.SV.W.0191.161030T2120Z-161030T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
520 PM EDT SUN OCT 30 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  SOUTHERN BERKS COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 545 PM EDT

* AT 520 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER HONEY
  BROOK...OR 9 MILES EAST OF NEW HOLLAND...MOVING EAST AT 50 MPH.

  HAZARD...60 MPH WIND GUSTS. 

  SOURCE...RADAR INDICATED. 

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

* THIS SEVERE THUNDERSTORM WILL BE NEAR...
  COATESVILLE AROUND 525 PM EDT. 
  GLENMOORE AROUND 530 PM EDT. 
  DOWNINGTOWN AND PUGHTOWN AROUND 535 PM EDT. 
  WEST CHESTER...LIONVILLE-MARCHWOOD...CHESTER SPRINGS AND LIONVILLE 
  AROUND 540 PM EDT. 
  PHOENIXVILLE...PAOLI AND VALLEY FORGE AROUND 545 PM EDT. 

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
THORNDALE...DEVON-BERWYN...EXTON...CHESTERBROOK...SPRING CITY...WEST
GOSHEN...MALVERN AND SOUTH COATESVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4004 7593 4011 7594 4014 7588 4019 7595
      4018 7554 4015 7552 4016 7550 4013 7550
      4013 7546 4009 7545 4009 7542 4006 7539
      4007 7536 4004 7541 4003 7540 4000 7545
      3998 7544 3993 7553 4000 7596
TIME...MOT...LOC 2120Z 277DEG 43KT 4010 7590 

HAIL...<.75IN
WIND...60MPH
 
$$

MPS
2 follow-up statements
917 
WWUS51 KPHI 302136
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
536 PM EDT SUN OCT 30 2016

PAC011-302146-
/O.CAN.KPHI.SV.W.0191.000000T0000Z-161030T2145Z/
BERKS PA-
536 PM EDT SUN OCT 30 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN BERKS COUNTY IS
CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED 
OUT OF THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 4004 7578 4007 7579 4011 7579 4017 7573
      4018 7554 4015 7552 4016 7550 4013 7550
      4013 7546 4009 7545 4009 7542 4006 7539
      4007 7536 4004 7541 4003 7540 4000 7545
      3998 7544 3993 7553 4000 7582
TIME...MOT...LOC 2136Z 277DEG 43KT 4008 7565 

$$

PAC029-302145-
/O.CON.KPHI.SV.W.0191.000000T0000Z-161030T2145Z/
CHESTER PA-
536 PM EDT SUN OCT 30 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR NORTHEASTERN CHESTER COUNTY...

AT 536 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER
LIONVILLE...OR 8 MILES NORTH OF WEST CHESTER...MOVING EAST AT 50 MPH.

HAZARD...60 MPH WIND GUSTS. 

SOURCE...RADAR INDICATED. 

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

THIS SEVERE STORM WILL BE NEAR...
  PHOENIXVILLE...PAOLI AND VALLEY FORGE AROUND 545 PM EDT. 

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
THORNDALE...DEVON-BERWYN...EXTON...CHESTERBROOK...SPRING CITY...WEST
GOSHEN AND MALVERN.

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 4004 7578 4007 7579 4011 7579 4017 7573
      4018 7554 4015 7552 4016 7550 4013 7550
      4013 7546 4009 7545 4009 7542 4006 7539
      4007 7536 4004 7541 4003 7540 4000 7545
      3998 7544 3993 7553 4000 7582
TIME...MOT...LOC 2136Z 277DEG 43KT 4008 7565 

HAIL...<.75IN
WIND...60MPH
 
$$

MPS
063 
WWUS51 KPHI 302142
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
542 PM EDT SUN OCT 30 2016

PAC029-302151-
/O.EXP.KPHI.SV.W.0191.000000T0000Z-161030T2145Z/
CHESTER PA-
542 PM EDT SUN OCT 30 2016

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CHESTER COUNTY
WILL EXPIRE AT 545 PM EDT...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE...THE WARNING WILL BE ALLOWED TO EXPIRE. HOWEVER...GUSTY
WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

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 4004 7578 4007 7579 4011 7579 4017 7573
      4018 7554 4015 7552 4016 7550 4013 7550
      4013 7546 4009 7545 4009 7542 4006 7539
      4007 7536 4004 7541 4003 7540 4000 7545
      3998 7544 3993 7553 4000 7582
TIME...MOT...LOC 2141Z 277DEG 43KT 4007 7557 

$$

MPS

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 30, 2:23 PM EDTSpecial Weather StatementPHICarbon, Monroe22 min
Oct 30, 4:11 PM EDTSpecial Weather StatementPHIBucks19 min
Oct 30, 5:01 PM EDTSpecial Weather StatementPHIChester44 min
Oct 30, 5:27 PM EDTSpecial Weather StatementPHIPhiladelphia48 min
Oct 30, 5:48 PM EDTSevere Thunderstorm WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia42 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.