Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 174, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 2, 2009, 11:14 AM EDT for Hunterdon County, Mercer County, Warren County, New Jersey; 4 counties in Pennsylvania. It was in force for 61 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 2, 2009, 11:14 AM EDT (15:14 UTC)
- Expired
- Aug 2, 2009, 12:15 PM EDT
- In force
- 61 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Hunterdon County, NJ, Mercer County, NJ, Warren County, NJ, Bucks County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 77 km from the middle of the area, began a volume at 15:07 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 |
|---|---|---|---|
| Aug 2, 11:40 AM EDT | TSTM WND DMG | 2 S Newtown, PA | NUMEROUS TREES DOWN. |
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, 3.2 hours before the alert went out and 191 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
- 105 J/kg
- Mixed-layer CIN
- -79 J/kg
- Mixed-layer LCL
- 723 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 021514 SVRPHI NJC019-021-041-PAC017-077-091-095-021615- /O.NEW.KPHI.SV.W.0174.090802T1514Z-090802T1615Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1114 AM EDT SUN AUG 2 2009 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHWESTERN MERCER COUNTY IN CENTRAL NEW JERSEY... EXTREME SOUTHEASTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA... SOUTH CENTRAL NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA... SOUTHERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY... EXTREME SOUTHWESTERN WARREN COUNTY IN NORTHWEST NEW JERSEY... BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA... CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA... * UNTIL 1215 PM EDT * AT 1112 AM 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 SOUDERTON...PENNSYLVANIA...AND MOVING EAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... FRICKS AND PERKASIE AROUND 1120 AM EDT... CHALFONT AROUND 1125 AM EDT... DUBLIN AROUND 1130 AM EDT... DOYLESTOWN AROUND 1135 AM EDT... GARDENVILLE AROUND 1140 AM EDT... LUMBERVILLE AROUND 1150 AM EDT... LAT...LON 4059 7481 4019 7482 4021 7543 4060 7541 TIME...MOT...LOC 1514Z 250DEG 23KT 4029 7529 $$ IOVINO
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 2:19 AM EDT | Flash Flood Watch | PHI | Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 5 more | 13 hr |
| Aug 2, 7:34 AM EDT | Areal Flood Advisory | PHI | Hunterdon, Mercer | 3 hr |
| Aug 2, 8:48 AM EDT | Areal Flood Warning | PHI | Mercer | 4 hr |
| Aug 2, 10:53 AM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester, Salem | 67 min |
| Aug 2, 11:18 AM EDT | Flash Flood Warning | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset | 9 hr |
| Aug 2, 11:25 AM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Mercer | 65 min |
| Aug 2, 11:30 AM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem | 60 min |
| Aug 2, 11:33 AM EDT | Special Marine Warning | PHI | 87 min | |
| Aug 2, 11:48 AM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Monmouth, Somerset | 57 min |
| Aug 2, 11:51 AM EDT | Tornado Warning | PHI | Mercer | 24 min |
| Aug 2, 12:13 PM EDT | Areal Flood Advisory | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 3 more | 3 hr |
| Aug 2, 12:23 PM EDT | Special Marine Warning | PHI | 97 min | |
| Aug 2, 12:27 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Somerset | 48 min |
| Aug 2, 12:45 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 60 min |
| Aug 2, 12:49 PM EDT | River Flood Warning | PHI | Mercer | 8 hr |
| Aug 2, 1:28 PM EDT | Special Marine Warning | PHI | 92 min | |
| Aug 2, 1:43 PM EDT | Severe Thunderstorm Warning | PHI | Cape May | 47 min |
| Aug 2, 1:49 PM EDT | Special Marine Warning | PHI | 86 min | |
| Aug 2, 1:51 PM EDT | Special Marine Warning | PHI | 84 min | |
| Aug 2, 1:56 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Aug 2, 1:59 PM EDT | River Flood Warning | PHI | Hunterdon, Somerset | 13 hr |
| Aug 2, 4:16 PM EDT | River Flood Warning | PHI | Middlesex, Somerset | 20 hr |
| Aug 2, 4:16 PM EDT | River Flood Warning | PHI | Middlesex, Somerset | 22 hr |
| Aug 2, 3:29 AM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| Aug 2, 5:54 AM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
| Aug 2, 7:51 AM EDT | Areal Flood Warning | PHI | Chester | 4 hr |
| Aug 2, 9:04 AM EDT | Areal Flood Warning | PHI | Montgomery, Philadelphia | 4 hr |
| Aug 2, 9:06 AM EDT | Flash Flood Warning | PHI | Berks, Carbon, Chester, Lehigh, Monroe, Northampton | 4 hr |
| Aug 2, 10:08 AM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 9 hr |
| Aug 2, 10:08 AM EDT | Severe Thunderstorm Warning | PHI | Chester | 67 min |
| Aug 2, 10:24 AM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 66 min |
| Aug 2, 12:33 PM EDT | River Flood Warning | PHI | Bucks | 28 hr |
| Aug 2, 1:25 PM EDT | Areal Flood Warning | PHI | Montgomery, Philadelphia | 6 hr |
| Aug 2, 4:06 PM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Aug 2, 4:21 PM EDT | River Flood Warning | PHI | Chester | 56 min |
| Aug 2, 4:22 PM EDT | Flash Flood Warning | PHI | Berks | 2 hr |
| Aug 2, 6:15 PM EDT | Areal Flood Warning | PHI | Montgomery, Philadelphia | 4 hr |
| Aug 2, 6:25 PM EDT | Areal Flood Warning | PHI | Philadelphia | 4 hr |
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.