Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 137, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 26, 2009, 4:06 PM EDT for Bucks County, Lehigh County, Northampton County, Pennsylvania; Hunterdon County, Warren County, New Jersey. It was in force for 54 min. 9 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 26, 2009, 4:06 PM EDT (20:06 UTC)
- Expired
- Jul 26, 2009, 5:00 PM EDT
- In force
- 54 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Hunterdon County, NJ, Warren County, NJ, Bucks County, PA, Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 104 km from the middle of the area, began a volume at 20:09 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 26, 4:25 PM EDT | FUNNEL CLOUD | Ferndale, PA | FUNNEL CLOUD SPOTTED OVER FERNDALE. |
| Jul 26, 4:25 PM EDT | HAIL 1.5 | Ferndale, PA | PING BALL SIZE HAIL IN FERNDALE. |
| Jul 26, 4:50 PM EDT | FUNNEL CLOUD | Frenchtown, NJ | ROTATING WALL CLOUD WITH FUNNEL CLOUD. |
| Jul 26, 4:50 PM EDT | TSTM WND DMG | 1 Se Milford, NJ | TREES DOWN, ROOF OFF BARN, SHED TOTALLY GONE, SWATH OF DAMAGE THROUGH WOODS IN ALEXANDRIA TWP. |
| Jul 26, 4:50 PM EDT | TSTM WND DMG | 6 S Clinton, NJ | NUMEROUS TREES DOWN IN PITTOWN. |
| Jul 26, 4:50 PM EDT | HAIL 1 | 6 S Clinton, NJ | QUARTER SIZE HAIL IN PITTOWN |
| Jul 26, 5:00 PM EDT | TSTM WND DMG | Clinton, NJ | 4 INCH DIAMETER BRANCHES DOWN. |
| Jul 26, 5:00 PM EDT | HAIL 0.25 | Clinton, NJ | QUARTER INCH HAIL IN CLINTON. |
| Jul 26, 5:00 PM EDT | HAIL 1 | Clinton, NJ | QUARTER SIZE HAIL IN CLINTON. |
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 |
|---|---|---|---|
| Jul 26, 3:51 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 8.1 hours before the alert went out and 197 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.
- Mixed-layer CAPE
- 933 J/kg
- Mixed-layer CIN
- -99 J/kg
- Mixed-layer LCL
- 889 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 161 m²/s²
- 0-3 km storm-relative helicity
- 217 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 262006 SVRPHI NJC019-041-PAC017-077-095-262100- /O.NEW.KPHI.SV.W.0137.090726T2006Z-090726T2100Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 406 PM EDT SUN JUL 26 2009 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA... THIS INCLUDES THE CITY OF ALLENTOWN... SOUTHERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA... THIS INCLUDES THE CITIES OF...EASTON...BETHLEHEM... NORTHERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY... SOUTHWESTERN WARREN COUNTY IN NORTHWEST NEW JERSEY... NORTHWESTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA... * UNTIL 500 PM EDT * AT 405 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR ZIONSVILLE...OR 9 MILES SOUTH OF ALLENTOWN...AND MOVING NORTHEAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... HELLERTOWN AROUND 420 PM EDT... PLEASANT VALLEY AND SPRINGTOWN AROUND 425 PM EDT... FERNDALE AND REVERE AROUND 435 PM EDT... MILFORD AND FRENCHTOWN AROUND 445 PM EDT... BLOOMSBURY AROUND 455 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES GREATEST KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM EDT SUNDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND SOUTHERN NEW JERSEY. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM EDT SUNDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA. && LAT...LON 4091 7504 4055 7482 4038 7541 4058 7564 TIME...MOT...LOC 2006Z 244DEG 24KT 4047 7542 $$ NIERENBERG
2 follow-up statements
000 WWUS51 KPHI 262028 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 428 PM EDT SUN JUL 26 2009 PAC077-262037- /O.CAN.KPHI.SV.W.0137.000000T0000Z-090726T2100Z/ LEHIGH PA- 428 PM EDT SUN JUL 26 2009 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LEHIGH COUNTY IS CANCELLED... THE STORM THAT PROMPTED THE WARNING HAS MOVED OUT OF THE AREA, THEREFORE THE WARNING HAS BEEN CANCELLED. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM EDT SUNDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA. LAT...LON 4043 7529 4061 7536 4091 7504 4055 7482 TIME...MOT...LOC 2027Z 246DEG 17KT 4054 7519 $$ NJC019-041-PAC017-095-262100- /O.CON.KPHI.SV.W.0137.000000T0000Z-090726T2100Z/ WARREN NJ-HUNTERDON NJ-NORTHAMPTON PA-BUCKS PA- 428 PM EDT SUN JUL 26 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT FOR NORTH CENTRAL BUCKS...SOUTHEASTERN NORTHAMPTON...NORTHERN HUNTERDON AND SOUTHWESTERN WARREN COUNTIES... AT 425 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR FERNDALE...OR 10 MILES SOUTH OF EASTON...MOVING NORTHEAST AT 25 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... ERWINNA BY 440 PM EDT... MILFORD AND FRENCHTOWN BY 445 PM EDT... BLOOMSBURY BY 450 PM EDT... BLOOMSBURY BY 455 PM EDT... CLINTON BY 500 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. && LAT...LON 4043 7529 4061 7536 4091 7504 4055 7482 TIME...MOT...LOC 2027Z 246DEG 20KT 4054 7519 $$ GORSE
000 WWUS51 KPHI 262040 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 440 PM EDT SUN JUL 26 2009 NJC019-041-PAC017-095-262100- /O.CON.KPHI.SV.W.0137.000000T0000Z-090726T2100Z/ WARREN NJ-HUNTERDON NJ-NORTHAMPTON PA-BUCKS PA- 440 PM EDT SUN JUL 26 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT FOR NORTH CENTRAL BUCKS...EAST CENTRAL NORTHAMPTON...NORTHERN HUNTERDON AND SOUTHWESTERN WARREN COUNTIES... AT 437 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR MILFORD...OR 10 MILES SOUTHEAST OF EASTON...MOVING NORTHEAST AT 25 MPH. AT 435 PM...A TRAINED WEATHER SPOTTER IN FERNDALE REPORTED HAIL RANGING FROM NICKEL TO PING PONG BALL SIZE. THE SEVERE THUNDERSTORM WILL BE NEAR... BLOOMSBURY BY 445 PM EDT... CLINTON...ANNANDALE...HIGH BRIDGE AND GLEN GARDNER BY 500 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM. WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM. THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. && LAT...LON 4046 7516 4064 7526 4091 7504 4055 7482 TIME...MOT...LOC 2039Z 246DEG 20KT 4058 7507 $$ GORSE
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 3:07 AM EDT | Flash Flood Watch | PHI | Berks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more | 20 hr |
| Jul 26, 7:05 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 70 min |
| Jul 25, 11:08 PM EDT | Flash Flood Warning | PHI | Sussex, Warren | 2 hr |
| Jul 26, 12:15 AM EDT | Flash Flood Warning | PHI | Sussex | 90 min |
| Jul 26, 3:26 AM EDT | Small Craft Advisory | PHI | 30 hr | |
| Jul 26, 3:29 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 61 min |
| Jul 26, 3:30 PM EDT | Special Marine Warning | PHI | 60 min | |
| Jul 26, 4:55 PM EDT | Tornado Warning | PHI | Hunterdon, Middlesex, Morris, Somerset | 55 min |
| Jul 26, 7:07 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 53 min |
| Jul 26, 7:40 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Monmouth, Ocean | 65 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2009Severe Thunderstorm Warnings in New Jersey, 2009Every severe thunderstorm warning in 2009
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.