Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 19, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Mar 1, 2017, 2:09 PM EST for 6 counties in Pennsylvania. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Mar 1, 2017, 2:09 PM EST (19:09 UTC)
- Expired
- Mar 1, 2017, 3:00 PM EST
- In force
- 51 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Berks County, PA, Bucks County, PA, Chester County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 139 km from the middle of the area, began a volume at 19:11 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Mar 1, 1:13 PM EST | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.2 hours before the alert went out and 99 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
- 624 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 212 m²/s²
- 0-3 km storm-relative helicity
- 284 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
004
WUUS51 KPHI 011909 RRA
SVRPHI
PAC011-017-029-077-091-095-012000-
/O.NEW.KPHI.SV.W.0019.170301T1909Z-170301T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
209 PM EST WED MAR 1 2017
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Berks County in eastern Pennsylvania...
Northwestern Montgomery County in southeastern Pennsylvania...
Lehigh County in eastern Pennsylvania...
Northwestern Bucks County in southeastern Pennsylvania...
Northern Chester County in southeastern Pennsylvania...
Southwestern Northampton County in eastern Pennsylvania...
* Until 300 PM EST
* At 209 PM EST, severe thunderstorms were located along a line
extending from Strausstown to Columbia, moving east at 60 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Allentown, Reading, West Chester, Bethlehem, Pottstown,
Phoenixville, Coatesville, Emmaus, Wyomissing, Northampton,
Quakertown, Downingtown, Birdsboro, Collegeville, Kutztown,
Royersford, Hamburg, Fleetwood, Sinking Spring and Laureldale.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 4051 7636 4052 7625 4058 7605 4057 7602
4062 7600 4076 7535 4025 7534 3993 7553
4000 7597 4004 7593 4011 7594 4014 7588
4046 7638
TIME...MOT...LOC 1909Z 254DEG 57KT 4052 7618 4006 7650
HAIL...<.75IN
WIND...60MPH
$$
JRK3 follow-up statements
488
WWUS51 KPHI 011925
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
225 PM EST WED MAR 1 2017
PAC011-017-029-077-091-095-012000-
/O.CON.KPHI.SV.W.0019.000000T0000Z-170301T2000Z/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Chester PA-Northampton PA-
225 PM EST WED MAR 1 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EST
FOR BERKS...NORTHWESTERN MONTGOMERY...LEHIGH...NORTHWESTERN BUCKS...
NORTHERN CHESTER AND SOUTHWESTERN NORTHAMPTON COUNTIES...
At 225 PM EST, severe thunderstorms were located along a line
extending from Shoemakersville to near Reamstown, moving east at 60
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Fleetwood, Shoemakersville and Lenhartsville around 230 PM EST.
Kutztown, Topton, Elverson, Lyons and New Morgan around 235 PM
EST.
Birdsboro and Claussville around 240 PM EST.
Allentown, Emmaus, Ancient Oaks, Cedarville, Coffeetown,
Zionsville and Pughtown around 245 PM EST.
Pottstown, Northampton, Royersford, Bechtelsville and
Gilbertsville around 250 PM EST.
Bethlehem, Collegeville, Trappe, Schwenksville, Bally, Steuben,
Lehigh University and Spring Mount around 255 PM EST.
East Greenville, Green Lane and Geryville around 300 PM EST.
Other locations impacted by these severe thunderstorms include
Harleysville, West Lawn, Boyertown, West Reading, Pottsgrove, Lorane,
Kenhorst, Hokendauqua, South Pottstown and Thorndale.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This severe thunderstorm may contain little or no lightning. Do not
wait until you hear thunder before taking cover.
&&
LAT...LON 3999 7549 3998 7582 4000 7597 4004 7593
4011 7594 4014 7588 4032 7616 4033 7616
4051 7606 4063 7596 4076 7535 4025 7534
TIME...MOT...LOC 1925Z 255DEG 57KT 4050 7594 4018 7612
HAIL...<.75IN
WIND...60MPH
$$
JRK762 WWUS51 KPHI 011943 SVSPHI Severe Weather Statement National Weather Service Mount Holly NJ 243 PM EST WED MAR 1 2017 PAC029-011952- /O.CAN.KPHI.SV.W.0019.000000T0000Z-170301T2000Z/ Chester PA- 243 PM EST WED MAR 1 2017 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CHESTER COUNTY IS CANCELLED... The storms which prompted the warning have weakened. Therefore, the warning has been cancelled. A severe thunderstorm watch remains in effect until 700 PM EST for eastern and southeastern Pennsylvania. LAT...LON 4039 7534 4041 7579 4070 7564 4076 7535 TIME...MOT...LOC 1942Z 252DEG 56KT 4070 7558 4048 7570 $$ PAC011-017-077-091-095-012000- /O.CON.KPHI.SV.W.0019.000000T0000Z-170301T2000Z/ Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Northampton PA- 243 PM EST WED MAR 1 2017 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EST FOR EAST CENTRAL BERKS...NORTHWESTERN MONTGOMERY...LEHIGH... NORTHWESTERN BUCKS AND SOUTHWESTERN NORTHAMPTON COUNTIES... At 242 PM EST, severe thunderstorms were located along a line extending from Neffs to Topton, moving east at 60 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. These severe storms will be near... Northampton, Bath and Steuben around 250 PM EST. Allentown and Bethlehem around 255 PM EST. Quakertown, Hellertown and Lehigh University around 300 PM EST. Other locations impacted by these severe thunderstorms include Macungie, Coopersburg, North Catasauqua, Alburtis, Coplay, Trumbauersville, Fountain Hill, Fullerton, Catasauqua and Hokendauqua. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. This severe thunderstorm may contain little or no lightning. Do not wait until you hear thunder before taking cover. && LAT...LON 4039 7534 4041 7579 4070 7564 4076 7535 TIME...MOT...LOC 1942Z 252DEG 56KT 4070 7558 4048 7570 HAIL...<.75IN WIND...60MPH $$ JRK
971
WWUS51 KPHI 011956
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
256 PM EST WED MAR 1 2017
PAC011-017-077-091-095-012006-
/O.EXP.KPHI.SV.W.0019.000000T0000Z-170301T2000Z/
Berks PA-Montgomery PA-Lehigh PA-Bucks PA-Northampton PA-
256 PM EST WED MAR 1 2017
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BERKS...
NORTHWESTERN MONTGOMERY...LEHIGH...NORTHWESTERN BUCKS AND
SOUTHWESTERN NORTHAMPTON COUNTIES WILL EXPIRE AT 300 PM EST...
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore the warning will
be allowed to expire. However gusty winds to 45 mph are still
possible with these showers.
A severe thunderstorm watch remains in effect until 700 PM EST for
eastern and southeastern Pennsylvania.
LAT...LON 4039 7534 4041 7579 4070 7564 4076 7535
TIME...MOT...LOC 1956Z 254DEG 57KT 4076 7532 4054 7544
$$
JRKThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 1, 2:00 PM EST | Severe Thunderstorm Warning | PHI | Chester, Delaware | 45 min |
| Mar 1, 2:02 PM EST | Special Weather Statement | PHI | Berks, Chester, Lehigh | 43 min |
| Mar 1, 2:31 PM EST | Special Weather Statement | PHI | Northampton | 29 min |
| Mar 1, 2:46 PM EST | Special Weather Statement | PHI | Delaware, Philadelphia | 29 min |
| Mar 1, 2:55 PM EST | Special Weather Statement | PHI | Bucks, Montgomery, Northampton | 35 min |
| Mar 1, 3:09 PM EST | Wind Advisory | PHI | Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more | 19 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.