Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 23, NWS Philadelphia/Mount Holly

April 26, 2019Bucks County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 26, 2019, 5:17 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 43 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: Apr 26, 2019, 5:17 PM EDT (21:17 UTC)
Expired: Apr 26, 2019, 6:00 PM EDT
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Bucks County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 98 km from the middle of the area, began a volume at 21:17 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
Apr 26, 5:45 PM EDT	TSTM WND DMG	Richlandtown, PA	TREES DOWN. TIME ESTIMATED FROM RADAR.

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
Apr 26, 1:33 PM EDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 9.3 hours before the alert went out and 212 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 735 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 326 m²/s²
0-3 km storm-relative helicity: 471 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

267 
WUUS51 KPHI 262117
SVRPHI
PAC017-091-262200-
/O.NEW.KPHI.SV.W.0023.190426T2117Z-190426T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
517 PM EDT FRI APR 26 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Montgomery County in southeastern Pennsylvania...
  Northwestern Bucks County in southeastern Pennsylvania...

* Until 600 PM EDT.

* At 517 PM EDT, a severe thunderstorm was located over Green Lane,
  or 17 miles south of Allentown, moving northeast at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Quakertown, Perkasie, East Greenville, Ferndale, Schwenksville,
  Riegelsville, Green Lane, Pleasant Valley, Revere, Ottsville,
  Geryville, Springtown, Spring Mount, Gilbertsville, Telford,
  Sellersville, Pennsburg, Coopersburg, Red Hill and Richlandtown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A tornado watch remains in effect until 900 PM EDT for eastern and
southeastern Pennsylvania.

LAT...LON 4045 7553 4042 7549 4051 7538 4060 7522
      4061 7520 4057 7518 4058 7512 4054 7507
      4051 7507 4024 7544 4031 7563
TIME...MOT...LOC 2117Z 207DEG 25KT 4034 7550 

HAIL...<.75IN
WIND...60MPH
 
$$

jjm

1 follow-up statement

980 
WWUS51 KPHI 262148
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
548 PM EDT FRI APR 26 2019

PAC091-262157-
/O.CAN.KPHI.SV.W.0023.000000T0000Z-190426T2200Z/
Montgomery PA-
548 PM EDT FRI APR 26 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MONTGOMERY COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 900 PM EDT for northwestern
New Jersey...and southeastern Pennsylvania.

LAT...LON 4051 7538 4061 7521 4060 7520 4057 7518
      4058 7512 4054 7507 4051 7507 4032 7532
      4042 7548
TIME...MOT...LOC 2147Z 247DEG 32KT 4046 7520 

$$

PAC017-262200-
/O.CON.KPHI.SV.W.0023.000000T0000Z-190426T2200Z/
Bucks PA-
548 PM EDT FRI APR 26 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT
FOR NORTHWESTERN BUCKS COUNTY...

At 547 PM EDT, a severe thunderstorm was located over Ottsville, or
16 miles south of Easton, moving east at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Quakertown, Perkasie, Bedminster, Ferndale, Riegelsville, Pleasant
Valley, Revere, Ottsville, Springtown, Telford, Sellersville,
Coopersburg, Richlandtown and Trumbauersville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A tornado watch remains in effect until 900 PM EDT for northwestern
New Jersey...and southeastern Pennsylvania.

LAT...LON 4051 7538 4061 7521 4060 7520 4057 7518
      4058 7512 4054 7507 4051 7507 4032 7532
      4042 7548
TIME...MOT...LOC 2147Z 247DEG 32KT 4046 7520 

HAIL...<.75IN
WIND...60MPH
 
$$

jjm

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 26, 11:45 AM EDT	Special Weather Statement	PHI	Philadelphia	45 min
Apr 26, 3:51 PM EDT	Special Weather Statement	PHI	Berks, Chester	69 min
Apr 26, 4:19 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	56 min
Apr 26, 4:28 PM EDT	Severe Thunderstorm Warning	PHI	Chester	47 min
Apr 26, 4:53 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	52 min
Apr 26, 4:59 PM EDT	Areal Flood Advisory	PHI	Berks, Chester, Delaware, Montgomery	4 hr
Apr 26, 5:07 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery, Philadelphia	53 min
Apr 26, 5:15 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Apr 26, 5:28 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery, Philadelphia	47 min
Apr 26, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	61 min
Apr 26, 5:57 PM EDT	Areal Flood Advisory	PHI	Bucks	4 hr
Apr 26, 6:34 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 1 more	2 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Every 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.