Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019
Severe Thunderstorm Warning 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Mar 15, 2019, 7:32 PM EDT for Bucks County, Chester County, Montgomery County, Pennsylvania. It was in force for 43 min. 5 reports 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
- Mar 15, 2019, 7:32 PM EDT (23:32 UTC)
- Expired
- Mar 15, 2019, 8:15 PM EDT
- In force
- 43 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Bucks County, PA, Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 89 km from the middle of the area, began a volume at 23:33 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 |
|---|---|---|---|
| Mar 15, 7:35 PM EDT | TSTM WND DMG | Marlborough Twp, PA | REPORTS OF SEVERAL TREES AND POWER LINES DOWN. |
| Mar 15, 7:38 PM EDT | TSTM WND DMG | Pottstown, PA | SOME TREES DOWN AND LOST POWER. UNKNOWN ESTIMATE OF WINDS. |
| Mar 15, 7:38 PM EDT | HAIL 1 | Pottstown, PA | |
| Mar 15, 7:40 PM EDT | TSTM WND DMG | Pottstown, PA | PHOTO SHOWS SPRUCE TREE OF ROUGHLY 2-3 FEET IN DIAMETER FALLEN ON HOME. NO SIGNIFICANT DAMAGE APPARENT THOUGH. TIME ESTIMATED FROM RADAR. |
| Mar 15, 7:41 PM EDT | HAIL 0.75 | Pottstown, PA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 11.5 hours before the alert went out and 219 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 841 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 397 m²/s²
- 0-3 km storm-relative helicity
- 414 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
999
WUUS51 KPHI 152332
SVRPHI
PAC017-029-091-160015-
/O.NEW.KPHI.SV.W.0004.190315T2332Z-190316T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
732 PM EDT FRI MAR 15 2019
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Central Montgomery County in southeastern Pennsylvania...
Central Bucks County in southeastern Pennsylvania...
North central Chester County in southeastern Pennsylvania...
* Until 815 PM EDT.
* At 731 PM EDT, a severe thunderstorm was located over Pottstown, or
16 miles east of Reading, moving east at 45 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Pottstown, Lansdale, Perkasie, Doylestown, Hatboro, Souderton,
Bedminster, Collegeville, Royersford, Chalfont, Trappe, Hatfield,
Dublin, Langhorne, Schwenksville, Ivyland, Green Lane, Fricks,
Spring Mount and Richboro.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to 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 4025 7569 4034 7561 4045 7507 4042 7506
4040 7503 4018 7492 4018 7570
TIME...MOT...LOC 2331Z 255DEG 39KT 4025 7563
HAIL...0.88IN
WIND...60MPH
$$
Gorse1 follow-up statement
033
WWUS51 KPHI 152354
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
754 PM EDT FRI MAR 15 2019
PAC029-160002-
/O.CAN.KPHI.SV.W.0004.000000T0000Z-190316T0015Z/
Chester PA-
754 PM EDT FRI MAR 15 2019
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL CHESTER COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning has been cancelled.
LAT...LON 4038 7539 4045 7507 4042 7506 4040 7503
4018 7492 4019 7555 4021 7556 4020 7556
4020 7557 4021 7558
TIME...MOT...LOC 2352Z 254DEG 47KT 4033 7526
$$
PAC017-091-160015-
/O.CON.KPHI.SV.W.0004.000000T0000Z-190316T0015Z/
Montgomery PA-Bucks PA-
754 PM EDT FRI MAR 15 2019
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR CENTRAL MONTGOMERY AND CENTRAL BUCKS COUNTIES...
At 752 PM EDT, a severe thunderstorm was located over Fricks, or 21
miles southeast of Allentown, moving east at 55 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Around 740 PM, a trained spotter reported quarter size hail and some
downed trees in Pottstown.
Locations impacted include...
Lansdale, Perkasie, Doylestown, Hatboro, Souderton, Bedminster,
Collegeville, Royersford, Chalfont, Trappe, Hatfield, Dublin,
Langhorne, Schwenksville, Ivyland, Fricks, Spring Mount, Richboro,
Pipersville and Gardenville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
In addition to 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 7539 4045 7507 4042 7506 4040 7503
4018 7492 4019 7555 4021 7556 4020 7556
4020 7557 4021 7558
TIME...MOT...LOC 2352Z 254DEG 47KT 4033 7526
HAIL...0.88IN
WIND...60MPH
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 15, 6:02 PM EDT | Special Weather Statement | PHI | Lehigh, Northampton | 28 min |
| Mar 15, 6:08 PM EDT | Special Weather Statement | PHI | Berks | 37 min |
| Mar 15, 6:27 PM EDT | Special Weather Statement | PHI | Northampton | 33 min |
| Mar 15, 6:33 PM EDT | Areal Flood Advisory | PHI | Berks, Lehigh, Northampton | 117 min |
| Mar 15, 7:09 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 51 min |
| Mar 15, 7:23 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 52 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2019Every severe thunderstorm warning in 2019
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.