Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 151, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 23, 2008, 4:27 PM EDT for Chester County, Delaware County, Pennsylvania; New Castle County, Delaware. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 23, 2008, 4:27 PM EDT (20:27 UTC)
- Expired
- Jul 23, 2008, 5:05 PM EDT
- In force
- 38 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties New Castle County, DE, Chester County, PA, Delaware County, PA
The radar
The Philadelphia radar (KDIX), 115 km from the middle of the area, began a volume at 20:27 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.
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 23, 2:34 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.5 hours before the alert went out and 62 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
- 1012 J/kg
- Mixed-layer CIN
- -98 J/kg
- Mixed-layer LCL
- 980 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- -61 m²/s²
- 0-3 km storm-relative helicity
- -48 m²/s²
- Significant tornado parameter
- -0.4
- Supercell composite
- -7.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 232028 SVRPHI DEC003-PAC029-045-232130- /O.NEW.KPHI.SV.W.0151.080723T2027Z-080723T2130Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 427 PM EDT WED JUL 23 2008 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHWESTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE... CENTRAL CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA... SOUTHWESTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA... * UNTIL 530 PM EDT * AT 425 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 KEMBLESVILLE...AND MOVING NORTH AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... WEST GROVE AND ASHLAND BY 435 PM... KENNETT SQUARE BY 440 PM... MARSHALLTON...COATESVILLE AND WEST CHESTER BY 500 PM... DOWNINGTOWN BY 510 PM... GLENMOORE AND LIONVILLE BY 520 PM... CHESTER SPRINGS BY 525 PM... 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. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND SOUTHEAST PENNSYLVANIA. LAT...LON 4013 7589 4008 7550 3972 7561 3973 7591 TIME...MOT...LOC 2027Z 192DEG 20KT 3978 7580 $$ IOVINO
1 follow-up statement
000 WWUS51 KPHI 232105 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 505 PM EDT WED JUL 23 2008 DEC003-PAC029-045-232115- /O.CAN.KPHI.SV.W.0151.000000T0000Z-080723T2130Z/ DELAWARE PA-CHESTER PA-NEW CASTLE DE- 505 PM EDT WED JUL 23 2008 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN NEW CASTLE... CENTRAL CHESTER AND SOUTHWESTERN DELAWARE COUNTIES IS CANCELLED... THE THUNDERSTORM THAT PROMPTED THE WARNING TO BE ISSUED HAS WEAKENED. THE SEVERE THUNDERSTORM WARNING IS CANCELLED. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND SOUTHEAST PENNSYLVANIA. LAT...LON 4013 7589 4008 7550 3972 7561 3973 7591 TIME...MOT...LOC 2105Z 192DEG 20KT 3999 7574 $$ IOVINO
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 3:51 AM EDT | Flash Flood Watch | PHI | Berks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more | 25 hr |
| Jul 23, 4:23 AM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Montgomery | 3 hr |
| Jul 23, 2:55 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 35 min |
| Jul 23, 2:58 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 47 min |
| Jul 23, 3:30 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 60 min |
| Jul 23, 3:58 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 62 min |
| Jul 23, 4:47 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 58 min |
| Jul 23, 5:03 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 57 min |
| Jul 23, 5:13 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 62 min |
| Jul 23, 7:00 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 60 min |
| Jul 23, 7:48 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 57 min |
| Jul 23, 1:11 AM EDT | Severe Thunderstorm Warning | PHI | New Castle | 64 min |
| Jul 23, 6:11 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 64 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2008Severe Thunderstorm Warnings in Delaware, 2008Every severe thunderstorm warning in 2008
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.