Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019
Severe Thunderstorm Warning 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Mar 15, 2019, 7:09 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania. It was in force for 51 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, 7:09 PM EDT (23:09 UTC)
- Expired
- Mar 15, 2019, 8:00 PM EDT
- In force
- 51 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Berks County, PA, Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 126 km from the middle of the area, began a volume at 23:10 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 |
|---|---|---|---|
| Mar 15, 7:30 PM EDT | TSTM WND DMG | Pottstown, PA | REPORTS OF SEVERAL TREES DOWN THROUGHOUT WESTERN PORTIONS OF MONTGOMERY COUNTY, MAINLY NEAR POTTSTOWN. SOME POWER LINES DOWN AS WELL. |
| 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.2 hours before the alert went out and 194 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
- 1006 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 379 m²/s²
- 0-3 km storm-relative helicity
- 410 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
123
WUUS51 KPHI 152309
SVRPHI
PAC011-029-091-160000-
/O.NEW.KPHI.SV.W.0001.190315T2309Z-190316T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
709 PM EDT FRI MAR 15 2019
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...
Northeastern Chester County in southeastern Pennsylvania...
* Until 800 PM EDT.
* At 708 PM EDT, a severe thunderstorm was located near New Morgan,
or 8 miles south of Reading, moving east at 35 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, Phoenixville, Birdsboro, Collegeville, Royersford,
Trappe, Elverson, New Morgan, Pughtown, Gilbertsville, Cedarville,
Stowe, Shillington, Boyertown, Spring City, Mohnton, Pottsgrove,
Lorane, South Pottstown and Amity Gardens.
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 4027 7606 4038 7554 4012 7545 4013 7590
4014 7588 4025 7605
TIME...MOT...LOC 2308Z 264DEG 31KT 4022 7596
HAIL...0.88IN
WIND...60MPH
$$
Gorse1 follow-up statement
927
WWUS51 KPHI 152335
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
735 PM EDT FRI MAR 15 2019
PAC011-029-091-160000-
/O.CON.KPHI.SV.W.0001.000000T0000Z-190316T0000Z/
Berks PA-Montgomery PA-Chester PA-
735 PM EDT FRI MAR 15 2019
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR SOUTHEASTERN BERKS...NORTHWESTERN MONTGOMERY AND NORTHEASTERN
CHESTER COUNTIES...
At 735 PM EDT, a severe thunderstorm was located over Pottstown, or
19 miles east of Reading, moving east at 45 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Pottstown, Phoenixville, Collegeville, Royersford, Trappe, Pughtown,
Gilbertsville, Cedarville, Stowe, Boyertown, Spring City, Pottsgrove,
South Pottstown, Amity Gardens, Sanatoga, Kenilworth and Halfway
House.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4038 7554 4012 7545 4013 7575 4034 7573
TIME...MOT...LOC 2335Z 263DEG 38KT 4025 7558
HAIL...0.75IN
WIND...60MPH
$$
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, 7:23 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 52 min |
| Mar 15, 7:32 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Montgomery | 43 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.