Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 77, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 15, 2009, 5:13 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 62 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
- Jun 15, 2009, 5:13 PM EDT (21:13 UTC)
- Expired
- Jun 15, 2009, 6:15 PM EDT
- In force
- 62 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Bucks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 75 km from the middle of the area, began a volume at 21:16 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 |
|---|---|---|---|
| Jun 15, 5:20 PM EDT | HAIL 1 | Lansdale, PA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.2 hours before the alert went out and 103 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
- 196 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 943 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 152113
SVRPHI
PAC017-091-152215-
/O.NEW.KPHI.SV.W.0077.090615T2113Z-090615T2215Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
513 PM EDT MON JUN 15 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
EASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
THIS INCLUDES THE CITY OF WILLOW GROVE...
* UNTIL 615 PM EDT
* AT 510 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
DAMAGING WINDS UP TO 60 MPH. THIS STORM WAS LOCATED NEAR
SOUDERTON...OR 14 MILES NORTHWEST OF WILLOW GROVE...AND MOVING
SOUTHEAST AT 20 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
LANSDALE AND CHALFONT AROUND 520 PM EDT...
8 MILES NORTHEAST OF NORRISTOWN AROUND 535 PM EDT...
AMBLER AROUND 540 PM EDT...
6 MILES NORTHEAST OF PLYMOUTH MEETING AROUND 545 PM EDT...
WILLOW GROVE AROUND 555 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL AND STRONG WINDS.
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT 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 4011 7506 4007 7512 4009 7522 4002 7534
4007 7537 4007 7540 4032 7546 4034 7525
TIME...MOT...LOC 2112Z 325DEG 17KT 4028 7530
$$
GORSE/DEFINO2 follow-up statements
000
WWUS51 KPHI 152126
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
526 PM EDT MON JUN 15 2009
PAC017-152134-
/O.CAN.KPHI.SV.W.0077.000000T0000Z-090615T2215Z/
BUCKS PA-
526 PM EDT MON JUN 15 2009
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BUCKS COUNTY IS
CANCELLED...
THE SEVERE THUNDERSTORM HAS EXITED THE COUNTY, THEREFORE THE WARNING
HAS BEEN CANCELLED.
LAT...LON 4008 7511 4009 7523 4002 7534 4007 7537
4007 7540 4026 7543 4028 7526 4011 7506
TIME...MOT...LOC 2124Z 325DEG 17KT 4021 7529
$$
PAC091-152215-
/O.CON.KPHI.SV.W.0077.000000T0000Z-090615T2215Z/
MONTGOMERY PA-
526 PM EDT MON JUN 15 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SOUTHEASTERN MONTGOMERY COUNTY...
AT 520 PM EDT...A TRAINED WEATHER SPOTTER REPORTED A SEVERE
THUNDERSTORM PRODUCING QUARTER SIZE HAIL IN LANSDALE. THIS STORM WAS
LOCATED NEAR NORTH WALES...OR 10 MILES NORTHWEST OF WILLOW
GROVE...MOVING SOUTHEAST AT 20 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
EAST NORRITON BY 530 PM EDT...
SPRING HOUSE AND BLUE BELL BY 535 PM EDT...
AMBLER...MAPLE GLEN AND PLYMOUTH MEETING BY 540 PM EDT...
FORT WASHINGTON AND PLYMOUTH MEETING BY 545 PM EDT...
FLOURTOWN AND ORELAND BY 550 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS STORM HAS A LONG HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER
NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT 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 4008 7511 4009 7523 4002 7534 4007 7537
4007 7540 4026 7543 4028 7526 4011 7506
TIME...MOT...LOC 2124Z 325DEG 17KT 4021 7529
$$
GORSE/DEFINO000
WWUS51 KPHI 152149
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
549 PM EDT MON JUN 15 2009
PAC091-152215-
/O.CON.KPHI.SV.W.0077.000000T0000Z-090615T2215Z/
MONTGOMERY PA-
549 PM EDT MON JUN 15 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR SOUTH CENTRAL MONTGOMERY COUNTY...
AT 547 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE
HAIL...AND DAMAGING WINDS UP TO 60 MPH. THIS STORM WAS LOCATED NEAR
FLOURTOWN...OR 7 MILES WEST OF WILLOW GROVE...MOVING SOUTHEAST AT 20
MPH.
THIS STORM HAS A LONG HISTORY OF PRODUCING LARGE HAIL AND STRONG
WINDS. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS
THE SEVERE THUNDERSTORM WILL BE NEAR...
GLENSIDE BY 555 PM EDT...
WYNCOTE BY 600 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
&&
LAT...LON 4008 7513 4009 7523 4002 7534 4007 7537
4008 7539 4014 7541 4020 7523
TIME...MOT...LOC 2148Z 325DEG 17KT 4010 7524
$$
GORSE/DEFINOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 2:33 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 57 min |
| Jun 15, 3:16 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Northampton | 59 min |
| Jun 15, 4:15 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Montgomery | 60 min |
| Jun 15, 5:55 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Montgomery, Philadelphia | 65 min |
| Jun 15, 6:37 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 53 min |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.