Alert archive / Pennsylvania / Tornado Warnings in 2017

Tornado Warning 4, NWS Philadelphia/Mount Holly

July 13, 2017Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this tornado warning at Jul 13, 2017, 5:08 PM EDT for Berks County, Pennsylvania. It was in force for 22 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: Jul 13, 2017, 5:08 PM EDT (21:08 UTC)
Expired: Jul 13, 2017, 5:30 PM EDT
In force: 22 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Berks County, PA

The radar

The Philadelphia radar (KDIX), 133 km from the middle of the area, began a volume at 21:07 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
Jul 13, 2:57 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.1 hours before the alert went out and 204 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: 135 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1715 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

563 
WFUS51 KPHI 132108
TORPHI
PAC011-132130-
/O.NEW.KPHI.TO.W.0004.170713T2108Z-170713T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
508 PM EDT THU JUL 13 2017

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  Central Berks County in eastern Pennsylvania...

* Until 530 PM EDT
    
* At 505 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Bernville, or 8 miles northwest of Reading, moving
  east at 30 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Robesonia and Fairview Hgts around 510 PM EDT. 
  Sinking Spring, Leesport and Spring Ridge around 515 PM EDT. 
  Reading, Wyomissing and Laureldale around 520 PM EDT. 
  Birdsboro around 530 PM EDT. 

Other locations impacted by this tornadic thunderstorm include
Wyomissing Hills, West Lawn, Boyertown, West Reading, Lorane,
Kenhorst, Mount Penn, Reiffton, Amity Gardens and Stowe.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4048 7606 4042 7557 4024 7569 4020 7577
      4035 7613
TIME...MOT...LOC 2105Z 291DEG 26KT 4039 7607 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Robertson

1 follow-up statement

810 
WWUS51 KPHI 132122
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
522 PM EDT THU JUL 13 2017

PAC011-132130-
/O.CON.KPHI.TO.W.0004.000000T0000Z-170713T2130Z/
Berks PA-
522 PM EDT THU JUL 13 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM EDT FOR
SOUTHEASTERN BERKS COUNTY...
    
At 522 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Reading, moving southeast at 30 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This dangerous storm will be near...
  Birdsboro around 530 PM EDT. 

Other locations impacted by this tornadic thunderstorm include Amity
Gardens, Stowe, Boyertown, West Reading, Lorane, St. Lawrence, Mount
Penn, Reiffton and Kenhorst.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4041 7593 4037 7560 4024 7569 4021 7575
      4032 7597
TIME...MOT...LOC 2122Z 292DEG 28KT 4036 7591 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 3:25 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Jul 13, 3:30 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	45 min
Jul 13, 4:06 PM EDT	Areal Flood Advisory	PHI	Bucks, Lehigh, Monroe, Northampton	114 min
Jul 13, 4:06 PM EDT	Special Weather Statement	PHI	Northampton	39 min
Jul 13, 4:08 PM EDT	Special Weather Statement	PHI	Schuylkill	37 min
Jul 13, 4:09 PM EDT	Special Weather Statement	PHI	Montgomery	36 min
Jul 13, 4:15 PM EDT	Severe Thunderstorm Warning	PHI	Berks	60 min
Jul 13, 4:34 PM EDT	Special Weather Statement	PHI	Chester	41 min
Jul 13, 4:36 PM EDT	Special Weather Statement	PHI	Lehigh	24 min
Jul 13, 4:42 PM EDT	Special Weather Statement	PHI	Montgomery, Philadelphia	48 min
Jul 13, 4:50 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Montgomery	115 min
Jul 13, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	40 min
Jul 13, 5:07 PM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	7 hr
Jul 13, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	35 min
Jul 13, 5:21 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Philadelphia	54 min
Jul 13, 5:25 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh	3 hr
Jul 13, 5:26 PM EDT	Tornado Warning	PHI	Berks, Chester, Montgomery	28 min
Jul 13, 5:30 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	45 min
Jul 13, 5:31 PM EDT	Flash Flood Warning	PHI	Bucks	3 hr
Jul 13, 5:36 PM EDT	Special Weather Statement	PHI	Montgomery	39 min
Jul 13, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	46 min
Jul 13, 5:56 PM EDT	Special Weather Statement	PHI	Berks	34 min
Jul 13, 6:28 PM EDT	Special Weather Statement	PHI	Bucks	47 min
Jul 13, 6:34 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	41 min
Jul 13, 7:03 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	117 min
Jul 13, 7:12 PM EDT	Special Weather Statement	PHI	Philadelphia	48 min
Jul 13, 7:26 PM EDT	Special Weather Statement	PHI	Berks, Montgomery	64 min

Nearby

Tornado Warnings in Pennsylvania, 2017 Every tornado warning in 2017 Tornadoes 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.