Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 28, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 23, 2009, 4:40 PM EDT for Bucks County, Northampton County, Pennsylvania; Hunterdon County, Warren County, New Jersey. It was in force for 37 min. 3 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 23, 2009, 4:40 PM EDT (20:40 UTC)
- Expired
- May 23, 2009, 5:17 PM EDT
- In force
- 37 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), 99 km from the middle of the area, began a volume at 20:43 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 |
|---|---|---|---|
| May 23, 4:47 PM EDT | HAIL 0.25 | Phillipsburg, NJ | QUARTER SIZE HAIL. |
| May 23, 4:47 PM EDT | HAIL 1 | Phillipsburg, NJ | QUARTER SIZE HAIL. |
| May 23, 4:52 PM EDT | HAIL 0.75 | Alpha, NJ | PENNY SIZE HAIL IN ALPHA. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 8.7 hours before the alert went out and 184 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1115 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 91 m²/s²
- 0-3 km storm-relative helicity
- 154 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 232040 SVRPHI NJC019-041-PAC017-095-232145- /O.NEW.KPHI.SV.W.0028.090523T2040Z-090523T2145Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 440 PM EDT SAT MAY 23 2009 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA... THIS INCLUDES THE CITY OF EASTON... NORTHWESTERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY... SOUTHERN WARREN COUNTY IN NORTHWEST NEW JERSEY... EXTREME NORTH CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA... * UNTIL 545 PM EDT * AT 440 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 FORKS AND EASTON...AND MOVING EAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... EASTON AND FORKS BY 445 PM EDT... ALPHA BY 455 PM EDT... HARMONY BY 500 PM EDT... BLOOMSBURY BY 510 PM EDT... BRASS CASTLE BY 520 PM EDT... PLEASANT VALLEY BY 525 PM EDT... LAT...LON 4081 7490 4051 7492 4060 7524 4077 7524 TIME...MOT...LOC 2040Z 271DEG 16KT 4069 7526 $$ IOVINO
2 follow-up statements
000 WWUS51 KPHI 232103 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 503 PM EDT SAT MAY 23 2009 PAC017-095-232112- /O.CAN.KPHI.SV.W.0028.000000T0000Z-090523T2145Z/ NORTHAMPTON PA-BUCKS PA- 503 PM EDT SAT MAY 23 2009 ...THE SEVERE THUNDERSTORM WARNING FOR EXTREME NORTH CENTRAL BUCKS AND CENTRAL NORTHAMPTON COUNTIES IS CANCELLED... THE SEVERE THUNDERSTORM HAS MOVED TO THE EAST. LAT...LON 4081 7490 4051 7492 4060 7514 4071 7511 TIME...MOT...LOC 2102Z 282DEG 17KT 4066 7508 $$ NJC019-041-232145- /O.CON.KPHI.SV.W.0028.000000T0000Z-090523T2145Z/ WARREN NJ-HUNTERDON NJ- 503 PM EDT SAT MAY 23 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT FOR NORTHWESTERN HUNTERDON AND SOUTH CENTRAL WARREN COUNTIES... AT 501 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 BLOOMSBURY...MOVING EAST AT 20 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... PLEASANT VALLEY BY 510 PM EDT... HAMPTON BY 515 PM EDT... GLEN GARDNER BY 520 PM EDT... LAT...LON 4081 7490 4051 7492 4060 7514 4071 7511 TIME...MOT...LOC 2102Z 282DEG 17KT 4066 7508 $$ IOVINO
000 WWUS51 KPHI 232117 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 517 PM EDT SAT MAY 23 2009 NJC019-041-232127- /O.CAN.KPHI.SV.W.0028.000000T0000Z-090523T2145Z/ WARREN NJ-HUNTERDON NJ- 517 PM EDT SAT MAY 23 2009 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN HUNTERDON AND SOUTH CENTRAL WARREN COUNTIES IS CANCELLED... THE THUNDERSTORM HAS WEAKENED CONSIDERABLY. AS A RESULT...THE WARNING HAS BEEN CANCELLED. LAT...LON 4081 7490 4051 7492 4060 7514 4071 7511 TIME...MOT...LOC 2117Z 282DEG 17KT 4064 7499 $$ IOVINO
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 4:16 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 44 min |
| May 23, 4:34 PM EDT | Areal Flood Advisory | PHI | Lehigh, Northampton | 85 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.