Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 42, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 19, 2017, 3:08 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania. It was in force for 52 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 19, 2017, 3:08 PM EDT (19:08 UTC)
- Expired
- Jun 19, 2017, 4:00 PM EDT
- In force
- 52 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Berks County, PA, Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 112 km from the middle of the area, began a volume at 19:10 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 19, 3:39 PM EDT | TSTM WND DMG | 1 Wnw Perkiomenville, PA | TWO FT DIAMETER TREES AND WIRES DOWN ON SNYDER AND HAUCK ROAD |
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 |
|---|---|---|---|
| Jun 19, 11:13 AM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.1 hours before the alert went out and 207 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
- 448 J/kg
- Mixed-layer CIN
- -97 J/kg
- Mixed-layer LCL
- 1049 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 73 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
176
WUUS51 KPHI 191908
SVRPHI
PAC011-029-091-192000-
/O.NEW.KPHI.SV.W.0042.170619T1908Z-170619T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
308 PM EDT MON JUN 19 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southeastern Berks County in eastern Pennsylvania...
Northwestern Montgomery County in southeastern Pennsylvania...
North central Chester County in southeastern Pennsylvania...
* Until 400 PM EDT
* At 307 PM EDT, severe thunderstorms were located along a line
extending from near Reading to near New Morgan, moving east at 40
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Severe thunderstorms will be near,
Birdsboro around 315 PM EDT.
Pottstown and Pughtown around 325 PM EDT.
Gilbertsville and Cedarville around 330 PM EDT.
Phoenixville and Royersford around 335 PM EDT.
Collegeville, Trappe, Schwenksville, Green Lane and Spring Mount
around 345 PM EDT.
East Norriton around 355 PM EDT.
Other locations impacted by these severe thunderstorms include
Harleysville, Boyertown, Pottsgrove, Lorane, South Pottstown,
Evansburg, Amity Gardens, Spring City, Stowe and Sanatoga.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to large hail and damaging winds...frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember...if you can hear thunder...you are close
enough to be struck by lightning.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4038 7542 4036 7538 4017 7535 4011 7593
4014 7588 4018 7594 4027 7598
TIME...MOT...LOC 1907Z 253DEG 34KT 4028 7589 4014 7589
HAIL...<.75IN
WIND...60MPH
$$
Drag2 follow-up statements
260
WWUS51 KPHI 191925
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
325 PM EDT MON JUN 19 2017
PAC011-029-091-192000-
/O.CON.KPHI.SV.W.0042.000000T0000Z-170619T2000Z/
Berks PA-Montgomery PA-Chester PA-
325 PM EDT MON JUN 19 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR SOUTHEASTERN BERKS...NORTHWESTERN MONTGOMERY AND NORTHEASTERN
CHESTER COUNTIES...
At 324 PM EDT, severe thunderstorms were located along a line
extending from near Gilbertsville to near Pughtown, moving east at 40
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
These severe storms will be near...
Gilbertsville around 330 PM EDT.
Royersford and Green Lane around 340 PM EDT.
Collegeville, Trappe and Schwenksville around 345 PM EDT.
Spring Mount around 350 PM EDT.
East Norriton around 355 PM EDT.
Other locations impacted by these severe thunderstorms include
Harleysville, Boyertown, Pottsgrove, South Pottstown, Evansburg,
Spring City, Stowe, Sanatoga, Kenilworth and Halfway House.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to large hail and damaging winds...frequent cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Remember...if you can hear thunder...you are close
enough to be struck by lightning.
&&
LAT...LON 4038 7542 4036 7538 4017 7535 4017 7572
4019 7576 4021 7578 4033 7569
TIME...MOT...LOC 1924Z 255DEG 34KT 4033 7565 4018 7572
HAIL...<.75IN
WIND...60MPH
$$
Drag724
WWUS51 KPHI 191938 RRA
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
338 PM EDT MON JUN 19 2017
PAC011-029-191948-
/O.CAN.KPHI.SV.W.0042.000000T0000Z-170619T2000Z/
Berks PA-Chester PA-
338 PM EDT MON JUN 19 2017
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BERKS AND
NORTHEASTERN CHESTER COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A severe thunderstorm watch remains in effect until 800 PM EDT for
southeastern Pennsylvania.
LAT...LON 4029 7556 4036 7555 4038 7542 4035 7538
4017 7535 4018 7555 4021 7556 4020 7556
4020 7558 4023 7559
TIME...MOT...LOC 1938Z 253DEG 34KT 4037 7549 4022 7556
$$
PAC091-192000-
/O.CON.KPHI.SV.W.0042.000000T0000Z-170619T2000Z/
Montgomery PA-
338 PM EDT MON JUN 19 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR NORTHWESTERN MONTGOMERY COUNTY...
At 338 PM EDT, severe thunderstorms were located along a line
extending from near Green Lane to near Royersford, moving east at 40
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
These severe storms will be near...
East Norriton around 355 PM EDT.
Other locations impacted by these severe thunderstorms include
Harleysville, Evansburg, Skippack, Spring City, Red Hill and
Sanatoga.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4029 7556 4036 7555 4038 7542 4035 7538
4017 7535 4018 7555 4021 7556 4020 7556
4020 7558 4023 7559
TIME...MOT...LOC 1938Z 253DEG 34KT 4037 7549 4022 7556
HAIL...<.75IN
WIND...60MPH
$$
DragThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 12:24 PM EDT | Special Weather Statement | PHI | Monroe | 21 min |
| Jun 19, 12:44 PM EDT | Special Weather Statement | PHI | Carbon | 31 min |
| Jun 19, 12:46 PM EDT | Special Weather Statement | PHI | Berks | 29 min |
| Jun 19, 12:55 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 50 min |
| Jun 19, 1:25 PM EDT | Special Weather Statement | PHI | Lehigh | 35 min |
| Jun 19, 1:29 PM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 4 hr |
| Jun 19, 1:42 PM EDT | Special Weather Statement | PHI | Berks | 63 min |
| Jun 19, 2:08 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 52 min |
| Jun 19, 2:20 PM EDT | Special Weather Statement | PHI | Northampton | 40 min |
| Jun 19, 2:25 PM EDT | Special Weather Statement | PHI | Berks | 50 min |
| Jun 19, 2:38 PM EDT | Special Weather Statement | PHI | Philadelphia | 22 min |
| Jun 19, 2:43 PM EDT | Special Weather Statement | PHI | Berks, Lehigh, Northampton | 47 min |
| Jun 19, 2:49 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Montgomery, Northampton | 41 min |
| Jun 19, 2:53 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 52 min |
| Jun 19, 2:57 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 48 min |
| Jun 19, 3:17 PM EDT | Flash Flood Warning | PHI | Monroe | 3 hr |
| Jun 19, 3:24 PM EDT | Flash Flood Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 3 hr |
| Jun 19, 3:25 PM EDT | Special Weather Statement | PHI | Chester | 50 min |
| Jun 19, 3:35 PM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia | 3 hr |
| Jun 19, 3:35 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh, Monroe, Northampton | 25 min |
| Jun 19, 3:53 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 37 min |
| Jun 19, 3:56 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 49 min |
| Jun 19, 4:07 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery | 38 min |
| Jun 19, 4:07 PM EDT | Severe Thunderstorm Warning | PHI | Delaware | 38 min |
| Jun 19, 4:34 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 41 min |
| Jun 19, 5:09 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Philadelphia | 51 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2017Every severe thunderstorm warning in 2017
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.