Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 4, NWS Philadelphia/Mount Holly

February 25, 2017Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 25, 2017, 2:47 PM EST for Berks 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: Feb 25, 2017, 2:47 PM EST (19:47 UTC)
Expired: Feb 25, 2017, 3:30 PM EST
In force: 43 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 160 km from the middle of the area, began a volume at 19:50 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
Feb 25, 3:20 PM EST	HAIL 1	Bernville, PA

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
Feb 25, 1:30 PM EST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.8 hours before the alert went out and 203 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: 235 J/kg
Mixed-layer CIN: -194 J/kg
Mixed-layer LCL: 676 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

734 
WUUS51 KPHI 251947
SVRPHI
PAC011-252030-
/O.NEW.KPHI.SV.W.0004.170225T1947Z-170225T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
247 PM EST SAT FEB 25 2017

The National Weather Service in Mount Holly NJ  has issued a

* Severe Thunderstorm Warning for...
  Northwestern Berks County in eastern Pennsylvania...

* Until 330 PM EST

* At 246 PM EST, severe thunderstorms were located along a line
  extending from near Manheim to near Lawn, moving northeast at 45
  mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Severe thunderstorms will be near,
  Womelsdorf and Newmanstown around 310 PM EST. 
  Robesonia around 315 PM EST. 
  Bernville around 320 PM EST. 
  Strausstown and Fairview Hgts around 325 PM EST. 
  Hamburg and Shoemakersville around 330 PM EST. 

Other locations impacted by these severe thunderstorms include
Centerport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

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

&&

LAT...LON 4052 7634 4052 7625 4058 7605 4057 7602
      4063 7600 4065 7598 4056 7581 4032 7615
      4036 7621 4037 7623 4046 7638
TIME...MOT...LOC 1946Z 216DEG 37KT 4018 7643 4019 7651 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

DRAG

1 follow-up statement

919 
WWUS51 KPHI 252006
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
306 PM EST SAT FEB 25 2017

PAC011-252030-
/O.CON.KPHI.SV.W.0004.000000T0000Z-170225T2030Z/
Berks PA-
306 PM EST SAT FEB 25 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EST
FOR NORTHWESTERN BERKS COUNTY...

At 306 PM EST, severe thunderstorms were located along a line
extending from Newmanstown to Myerstown, moving northeast at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

These severe storms will be near...
  Womelsdorf and Robesonia around 310 PM EST. 
  Bernville around 320 PM EST. 
  Strausstown and Fairview Hgts around 325 PM EST. 
  Hamburg, Leesport and Shoemakersville around 330 PM EST. 

Other locations impacted by these severe thunderstorms include
Centerport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

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 4052 7634 4052 7625 4058 7605 4057 7602
      4063 7600 4065 7598 4056 7581 4032 7615
      4036 7621 4037 7623 4046 7638
TIME...MOT...LOC 2006Z 228DEG 30KT 4035 7622 4037 7628 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 25, 2:22 PM EST	Special Weather Statement	PHI	Lebanon	53 min
Feb 25, 2:55 PM EST	Special Weather Statement	PHI	Carbon	50 min
Feb 25, 3:02 PM EST	Special Weather Statement	PHI	Berks	58 min
Feb 25, 3:19 PM EST	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Northampton	41 min
Feb 25, 3:26 PM EST	Severe Thunderstorm Warning	PHI	Berks, Chester	64 min
Feb 25, 3:57 PM EST	Special Weather Statement	PHI	Lehigh, Montgomery	48 min
Feb 25, 4:04 PM EST	Severe Thunderstorm Warning	PHI	Chester, Delaware	41 min
Feb 25, 4:05 PM EST	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe	40 min
Feb 25, 4:17 PM EST	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Lehigh, Monroe and 3 more	43 min
Feb 25, 4:34 PM EST	Special Weather Statement	PHI	Monroe	41 min
Feb 25, 4:40 PM EST	Severe Thunderstorm Warning	PHI	Delaware, Montgomery, Philadelphia	50 min
Feb 25, 4:54 PM EST	Severe Thunderstorm Warning	PHI	Bucks, Monroe	51 min
Feb 25, 5:01 PM EST	Special Weather Statement	PHI	Bucks	44 min
Feb 25, 5:17 PM EST	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	43 min
Feb 25, 6:10 PM EST	Special Weather Statement	PHI	Delaware	35 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2017 Every 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.