Alert archive / New Jersey / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 40, NWS Philadelphia/Mount Holly

May 27, 2010Hunterdon County, Warren County, New Jersey; Bucks County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 27, 2010, 3:19 PM EDT for Hunterdon County, Warren County, New Jersey; Bucks County, Northampton County, Pennsylvania. It was in force for 41 min. 2 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 27, 2010, 3:19 PM EDT (19:19 UTC)
Expired
May 27, 2010, 4:00 PM EDT
In force
41 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Hunterdon County, NJ, Warren County, NJ, Bucks County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 90 km from the middle of the area, began a volume at 19:19 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
May 27, 3:40 PM EDTHAIL 0.25Ferndale, PAPEA TO SOME PENNY SIZE HAIL REPORTED IN FERNDALE.
May 27, 3:40 PM EDTHAIL 0.75Ferndale, PAPEA TO SOME PENNY SIZE HAIL REPORTED IN FERNDALE.

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.

IssuedProductOfficeLasted
May 27, 1:23 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.3 hours before the alert went out and 143 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, Phillips Aaf/Abe, MD at 12:00Z on 2010-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 759 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, Phillips Aaf/Abe, MD at 12:00Z on 2010-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -74 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
759 J/kg
Mixed-layer CIN
-227 J/kg
Mixed-layer LCL
1358 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-74 m²/s²
0-3 km storm-relative helicity
53 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

485 
WUUS51 KPHI 271919
SVRPHI
NJC019-041-PAC017-095-272000-
/O.NEW.KPHI.SV.W.0040.100527T1919Z-100527T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
319 PM EDT THU MAY 27 2010

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF EASTON...
  WEST CENTRAL HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
  SOUTHWESTERN WARREN COUNTY IN NORTHWEST NEW JERSEY...
  CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...

* UNTIL 400 PM EDT

* AT 315 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR ALPHA...OR NEAR EASTON...AND MOVING SOUTH AT
  25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MILFORD AROUND 325 PM EDT...
  FERNDALE AND SPRINGTOWN AROUND 330 PM EDT...
  REVERE AND PLEASANT VALLEY AROUND 335 PM EDT...
  OTTSVILLE AROUND 340 PM EDT...
  BEDMINSTER AND PIPERSVILLE AROUND 345 PM EDT...
  DUBLIN AND PERKASIE AROUND 355 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...HEAVY RAIN WILL OCCUR
WITH THESE STORMS AND CAUSE LOW-LYING AND POOR DRAINAGE FLOODING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
THURSDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4066 7502 4028 7505 4034 7538 4070 7528
TIME...MOT...LOC 1919Z 011DEG 24KT 4061 7518

$$

PO
2 follow-up statements
969 
WWUS51 KPHI 271940
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
340 PM EDT THU MAY 27 2010

NJC019-041-PAC017-095-272000-
/O.CON.KPHI.SV.W.0040.000000T0000Z-100527T2000Z/
WARREN NJ-HUNTERDON NJ-NORTHAMPTON PA-BUCKS PA-
340 PM EDT THU MAY 27 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR NORTH CENTRAL BUCKS...SOUTH CENTRAL NORTHAMPTON...EXTREME WEST
CENTRAL HUNTERDON AND EXTREME SOUTHWESTERN WARREN COUNTIES...

AT 336 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DAMAGING
HAIL UP TO GOLF BALL SIZE.  THIS STORM WAS LOCATED NEAR
RIEGELSVILLE...OR 7 MILES SOUTH OF EASTON...MOVING SOUTHWEST AT 15
MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  FERNDALE AND REVERE BY 350 PM EDT...
  SPRINGTOWN BY 355 PM EDT...
  PLEASANT VALLEY...RICHLANDTOWN...6 MILES NORTHWEST OF OTTSVILLE AND
  8 MILES NORTHWEST OF BEDMINSTER BY 400 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
THURSDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

&&

LAT...LON 4070 7527 4069 7523 4061 7505 4038 7521
      4044 7535 4067 7529
TIME...MOT...LOC 1941Z 030DEG 12KT 4058 7522

$$

PO
456 
WWUS51 KPHI 271956
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
356 PM EDT THU MAY 27 2010

NJC019-041-PAC017-095-272005-
/O.EXP.KPHI.SV.W.0040.000000T0000Z-100527T2000Z/
WARREN NJ-HUNTERDON NJ-NORTHAMPTON PA-BUCKS PA-
356 PM EDT THU MAY 27 2010

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BUCKS...SOUTH
CENTRAL NORTHAMPTON...WEST CENTRAL HUNTERDON AND EXTREME SOUTHWESTERN
WARREN COUNTIES WILL EXPIRE AT 400 PM EDT...

THE THUNDERSTORM THAT EARLIER PRODUCED GOLFBALL SIZED HAIL IN 
NORTHAMPTON COUNTY NEAR WILLIAMS TOWNSHIP HAS WEAKENED. IT CONTINUES 
TO PRODUCE SMALL HAIL AND HEAVY RAINS ACROSS NORTHERN BUCKS COUNTY. 
IT CONTINUES TO MOVE TO THE SOUTH AT AROUND 20 MPH. 

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT
THURSDAY EVENING FOR NORTHERN DELAWARE AND NORTHEASTERN MARYLAND AND
NEW JERSEY AND EASTERN PENNSYLVANIA.

LAT...LON 4070 7527 4069 7523 4061 7505 4038 7521
      4044 7535 4067 7529
TIME...MOT...LOC 1955Z 030DEG 12KT 4054 7525

$$

PO

The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 4:05 AM EDTCoastal Flood AdvisoryPHIAtlantic, Burlington, Cape May, Middlesex, Monmouth, Ocean19 hr
May 27, 1:55 PM EDTSpecial Weather StatementPHIWarren65 min
May 27, 2:00 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren60 min
May 27, 3:25 PM EDTSmall Craft Advisory for Hazardous SeasPHI12 hr
May 27, 3:36 PM EDTSpecial Weather StatementPHISussex, Warren54 min
May 27, 4:20 PM EDTSpecial Weather StatementPHISussex55 min
May 27, 5:36 PM EDTSevere Thunderstorm WarningPHIMorris, Sussex, Warren54 min
May 27, 6:35 PM EDTSpecial Weather StatementPHIWarren55 min
May 27, 7:40 PM EDTSpecial Weather StatementPHIMercer65 min
May 27, 2:30 PM EDTFlash Flood WarningPHINorthampton33 min
May 27, 2:45 PM EDTSpecial Weather StatementPHIChester60 min
May 27, 4:53 PM EDTSpecial Weather StatementPHIBucks, Montgomery52 min
May 27, 5:11 PM EDTSevere Thunderstorm WarningPHIBerks, Carbon, Lehigh, Northampton64 min
May 27, 5:44 PM EDTSpecial Weather StatementPHIDelaware, Montgomery61 min
May 27, 5:53 PM EDTSevere Thunderstorm WarningPHIChester, Delaware, Montgomery37 min
May 27, 6:05 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Montgomery25 min
May 27, 6:20 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Lehigh, Montgomery55 min
May 27, 7:12 PM EDTSevere Thunderstorm WarningPHIBerks, Chester, Delaware, Montgomery48 min
May 27, 7:25 PM EDTSpecial Weather StatementPHIMontgomery65 min
May 27, 7:44 PM EDTAreal Flood AdvisoryPHIBerks, Chester, Montgomery3 hr
May 27, 7:56 PM EDTSevere Thunderstorm WarningPHIChester, Delaware34 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2010Severe Thunderstorm Warnings in Pennsylvania, 2010Every severe thunderstorm warning in 2010

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.