Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010
Severe Thunderstorm Warning 18, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 14, 2010, 5:49 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania. It was in force for 56 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
- May 14, 2010, 5:49 PM EDT (21:49 UTC)
- Expired
- May 14, 2010, 6:45 PM EDT
- In force
- 56 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Berks County, PA, Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 105 km from the middle of the area, began a volume at 21:51 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 |
|---|---|---|---|
| May 14, 6:00 PM EDT | TSTM WND DMG | Mount Penn, PA | TREES DOWN ON MULTIPLE CARS ON BRIGHTON AVE IN MOUNT PENN. |
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 |
|---|---|---|---|
| May 14, 3:43 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.8 hours before the alert went out and 100 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 557 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 187 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
735 WUUS51 KPHI 142149 SVRPHI PAC011-029-091-142245- /O.NEW.KPHI.SV.W.0018.100514T2149Z-100514T2245Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 549 PM EDT FRI MAY 14 2010 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA... THIS INCLUDES THE CITY OF READING... NORTHEASTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA... CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA... * UNTIL 645 PM EDT * AT 547 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR READING...AND MOVING EAST AT 40 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... BIRDSBORO AROUND 600 PM EDT... POTTSTOWN...GILBERTSVILLE AND CEDARVILLE AROUND 610 PM EDT... ROYERSFORD AROUND 620 PM EDT... SCHWENKSVILLE...SPRING MOUNT...TRAPPE AND COLLEGEVILLE AROUND 625 PM EDT... HATFIELD AROUND 635 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT FRIDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND EASTERN PENNSYLVANIA. && LAT...LON 4027 7524 4007 7536 4028 7603 4045 7596 TIME...MOT...LOC 2149Z 288DEG 36KT 4035 7591 $$ HAYES
2 follow-up statements
824
WWUS51 KPHI 142230
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
630 PM EDT FRI MAY 14 2010
PAC011-142240-
/O.CAN.KPHI.SV.W.0018.000000T0000Z-100514T2245Z/
BERKS PA-
630 PM EDT FRI MAY 14 2010
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BERKS COUNTY IS
CANCELLED...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
FRIDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA.
LAT...LON 4019 7562 4034 7553 4028 7530 4027 7524
4007 7536
TIME...MOT...LOC 2230Z 288DEG 36KT 4022 7540
$$
PAC029-091-142245-
/O.CON.KPHI.SV.W.0018.000000T0000Z-100514T2245Z/
CHESTER PA-MONTGOMERY PA-
630 PM EDT FRI MAY 14 2010
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR CENTRAL MONTGOMERY AND EXTREME NORTHEASTERN CHESTER COUNTIES...
AT 625 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR SCHWENKSVILLE...OR 20 MILES NORTH OF WEST CHESTER...
MOVING EAST AT 40 MPH.
THE SEVERE THUNDERSTORM WILL BE NEAR...
KULPSVILLE...EAST NORRITON...HATFIELD AND 6 MILES NORTH OF
NORRISTOWN BY 635 PM EDT...
NORTH WALES...LANSDALE AND 7 MILES NORTH OF BRIDGEPORT BY 640 PM
EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
FRIDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA.
&&
LAT...LON 4019 7562 4034 7553 4028 7530 4027 7524
4007 7536
TIME...MOT...LOC 2230Z 288DEG 36KT 4022 7540
$$
HAYES565
WWUS51 KPHI 142241
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
641 PM EDT FRI MAY 14 2010
PAC029-091-142252-
/O.EXP.KPHI.SV.W.0018.000000T0000Z-100514T2245Z/
CHESTER PA-MONTGOMERY PA-
641 PM EDT FRI MAY 14 2010
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MONTGOMERY AND EXTREME
NORTHEASTERN CHESTER COUNTIES WILL EXPIRE AT 645 PM EDT...
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
FRIDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY
AND EASTERN PENNSYLVANIA.
LAT...LON 4019 7562 4034 7553 4028 7530 4027 7524
4007 7536
TIME...MOT...LOC 2242Z 288DEG 36KT 4018 7525
$$
HAYESThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 14, 3:52 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 53 min |
| May 14, 4:18 PM EDT | Special Weather Statement | PHI | Carbon | 57 min |
| May 14, 4:26 PM EDT | Special Weather Statement | PHI | Carbon, Northampton | 64 min |
| May 14, 4:42 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 63 min |
| May 14, 5:04 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 56 min |
| May 14, 5:07 PM EDT | Special Weather Statement | PHI | Northampton | 53 min |
| May 14, 5:38 PM EDT | Tornado Warning | PHI | Berks, Lehigh | 37 min |
| May 14, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Lehigh, Northampton | 67 min |
| May 14, 6:11 PM EDT | Special Weather Statement | PHI | Carbon | 64 min |
| May 14, 6:25 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Montgomery, Philadelphia | 65 min |
| May 14, 6:35 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 55 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2010Every severe thunderstorm warning in 2010
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.