Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 155, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2009, 5:28 PM EDT for Berks County, Lehigh County, Northampton County, Pennsylvania. It was in force for 40 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 29, 2009, 5:28 PM EDT (21:28 UTC)
- Expired
- Jul 29, 2009, 6:08 PM EDT
- In force
- 40 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Berks County, PA, Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 121 km from the middle of the area, began a volume at 21:29 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 29, 12:49 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.5 hours before the alert went out and 129 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
- 1577 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 745 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 292128
SVRPHI
PAC011-077-095-292230-
/O.NEW.KPHI.SV.W.0155.090729T2128Z-090729T2230Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
528 PM EDT WED JUL 29 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
EAST CENTRAL BERKS COUNTY IN EASTERN PENNSYLVANIA...
LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF ALLENTOWN...
SOUTHERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
THIS INCLUDES THE CITY OF BETHLEHEM...
* UNTIL 630 PM EDT
* AT 527 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 10
MILES SOUTHWEST OF ZIONSVILLE...OR 15 MILES EAST OF READING...AND
MOVING NORTH AT 30 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
ANCIENT OAKS AND 6 MILES WEST OF ZIONSVILLE AROUND 545 PM EDT...
EMMAUS AROUND 550 PM EDT...
CLAUSSVILLE AROUND 555 PM EDT...
COFFEETOWN AND ALLENTOWN AROUND 600 PM EDT...
NEFFS AND SCHNECKSVILLE AROUND 605 PM EDT...
NORTHAMPTON AROUND 610 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 800 PM EDT
WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.
&&
LAT...LON 4077 7563 4067 7526 4044 7554 4034 7564
4039 7579
TIME...MOT...LOC 2128Z 202DEG 27KT 4041 7566
$$
EBERWINE2 follow-up statements
000
WWUS51 KPHI 292154
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
554 PM EDT WED JUL 29 2009
PAC011-292203-
/O.CAN.KPHI.SV.W.0155.000000T0000Z-090729T2230Z/
BERKS PA-
554 PM EDT WED JUL 29 2009
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BERKS COUNTY IS
CANCELLED...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.
A TREE WAS REPORTED DOWN ACROSS ROUTES ALONG ROUTES 662 AND 422.
LAT...LON 4054 7542 4063 7568 4077 7563 4067 7526
4044 7554
TIME...MOT...LOC 2153Z 202DEG 27KT 4064 7553
$$
PAC077-095-292230-
/O.CON.KPHI.SV.W.0155.000000T0000Z-090729T2230Z/
LEHIGH PA-NORTHAMPTON PA-
554 PM EDT WED JUL 29 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR SOUTHWESTERN NORTHAMPTON AND NORTHEASTERN LEHIGH COUNTIES...
AT 552 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 NEAR COFFEETOWN...OR NEAR ALLENTOWN...MOVING NORTH AT 30 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
NORTHAMPTON...COPLAY...NORTH CATASAUQUA AND CATASAUQUA BY 600 PM
EDT...
6 MILES EAST OF WALNUTPORT...7 MILES WEST OF STEUBEN AND 7 MILES
EAST OF SLATINGTON BY 605 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.
&&
LAT...LON 4054 7542 4063 7568 4077 7563 4067 7526
4044 7554
TIME...MOT...LOC 2153Z 202DEG 27KT 4064 7553
$$
EBERWINE000
WWUS51 KPHI 292208
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
608 PM EDT WED JUL 29 2009
PAC077-095-292218-
/O.CAN.KPHI.SV.W.0155.000000T0000Z-090729T2230Z/
LEHIGH PA-NORTHAMPTON PA-
608 PM EDT WED JUL 29 2009
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN NORTHAMPTON AND
NORTHEASTERN LEHIGH COUNTIES IS CANCELLED...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW
JERSEY AND EASTERN PENNSYLVANIA.
SHOWERS AND THUNDERSTORMS WILL CONTINUE TO MOVE THROUGH THE AREA OVER
THE NEXT HOUR.
LAT...LON 4054 7542 4063 7568 4077 7563 4067 7526
4044 7554
TIME...MOT...LOC 2208Z 202DEG 27KT 4074 7548
$$
EBERWINEThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 10:15 AM EDT | Flash Flood Watch | PHI | Berks, Delaware, Lehigh, Northampton, Philadelphia | 17 hr |
| Jul 29, 11:48 AM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Montgomery | 72 min |
| Jul 29, 12:12 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 78 min |
| Jul 29, 1:51 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe | 9 hr |
| Jul 29, 1:56 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 64 min |
| Jul 29, 2:04 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 56 min |
| Jul 29, 2:11 PM EDT | Tornado Warning | PHI | Carbon, Monroe | 34 min |
| Jul 29, 2:32 PM EDT | Flash Flood Warning | PHI | Monroe | 6 hr |
| Jul 29, 5:09 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 66 min |
| Jul 29, 5:55 PM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Montgomery, Philadelphia | 4 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.