Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2006
Severe Thunderstorm Warning 169, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 18, 2006, 6:27 PM EDT for Chester County, Pennsylvania. It was in force for 78 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
- Jul 18, 2006, 6:27 PM EDT (22:27 UTC)
- Expired
- Jul 18, 2006, 7:45 PM EDT
- In force
- 78 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
County Chester County, PA
The radar
The Philadelphia radar (KDIX), 115 km from the middle of the area, began a volume at 22:27 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 18, 7:20 PM EDT | TSTM WND DMG | Paoli, PA | TREES DOWN IN PAOLI. |
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 18, 12:38 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.5 hours before the alert went out and 79 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
- 1100 J/kg
- Mixed-layer CIN
- -174 J/kg
- Mixed-layer LCL
- 1804 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- 16 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 182227 SVRPHI PAC029-182345- /O.NEW.KPHI.SV.W.0169.060718T2227Z-060718T2345Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 627 PM EDT TUE JUL 18 2006 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA * UNTIL 745 PM EDT * AT 623 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 ELVERSON...OR ABOUT 14 MILES SOUTH OF READING...AND MOVING EAST AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... LIONVILLE BY 705 PM EDT... PAOLI BY 735 PM EDT... 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 4016 7582 4006 7600 4002 7543 4024 7564 $$ AMC/MPD
1 follow-up statement
000 WWUS51 KPHI 182317 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 717 PM EDT TUE JUL 18 2006 PAC029-182345- /O.CON.KPHI.SV.W.0169.000000T0000Z-060718T2345Z/ CHESTER PA- 717 PM EDT TUE JUL 18 2006 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT FOR NORTHEASTERN CHESTER COUNTY... AT 713 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 7 MILES NORTHWEST OF LIONVILLE...OR ABOUT 18 MILES SOUTHEAST OF READING...MOVING EAST AT 20 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... LIONVILLE BY 725 PM EDT... 7 MILES SOUTH OF KENILWORTH BY 730 PM EDT... 6 MILES NORTH OF PAOLI AND 6 MILES NORTH OF MALVERN BY 745 PM EDT... A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT TUESDAY EVENING FOR NORTHWESTERN NEW JERSEY AND EASTERN PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 100 AM EDT WEDNESDAY MORNING FOR SOUTHWESTERN DELAWARE AND NORTHEASTERN MARYLAND AND NORTHWESTERN NEW JERSEY AND SOUTHEAST PENNSYLVANIA. LAT...LON 4018 7579 4004 7578 4002 7543 4024 7564 $$ AMC
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 4:51 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 56 min |
| Jul 18, 5:33 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh, Northampton | 57 min |
| Jul 18, 7:09 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Montgomery | 81 min |
| Jul 18, 7:25 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 65 min |
| Jul 18, 7:37 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 53 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2006Every severe thunderstorm warning in 2006
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.