Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 56, NWS Philadelphia/Mount Holly

July 27, 2018Berks County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 27, 2018, 3:11 PM EDT for Berks County, Lehigh County, Pennsylvania. It was in force for 49 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 27, 2018, 3:11 PM EDT (19:11 UTC)
Expired: Jul 27, 2018, 4:00 PM EDT
In force: 49 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Berks County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 120 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
Jul 27, 1:17 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.2 hours before the alert went out and 225 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: 958 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1053 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

683 
WUUS51 KPHI 271911
SVRPHI
PAC011-077-272000-
/O.NEW.KPHI.SV.W.0056.180727T1911Z-180727T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
311 PM EDT FRI JUL 27 2018

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  East central Berks County in eastern Pennsylvania...
  Southeastern Lehigh County in eastern Pennsylvania...

* Until 400 PM EDT.

* At 311 PM EDT, a severe thunderstorm was located over Lyons, or 12
  miles northeast of Reading, and is nearly stationary.

  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...
  Emmaus, Kutztown, Fleetwood, Topton, Bally, Bechtelsville, Lyons,
  Ancient Oaks, Zionsville, Boyertown, Macungie and Alburtis.

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.

&&

LAT...LON 4055 7578 4053 7545 4044 7552 4045 7553
      4030 7565 4040 7589
TIME...MOT...LOC 1911Z 281DEG 2KT 4044 7575 

HAIL...0.75IN
WIND...60MPH
 
$$

CMS

2 follow-up statements

320 
WWUS51 KPHI 271934
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
334 PM EDT FRI JUL 27 2018

PAC011-077-272000-
/O.CON.KPHI.SV.W.0056.000000T0000Z-180727T2000Z/
Berks PA-Lehigh PA-
334 PM EDT FRI JUL 27 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EDT
FOR EAST CENTRAL BERKS AND SOUTHEASTERN LEHIGH COUNTIES...

At 334 PM EDT, a severe thunderstorm was located near Topton, or 12
miles southwest of Allentown, moving east at 15 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...
Emmaus, Kutztown, Fleetwood, Topton, Bally, Bechtelsville, Lyons,
Ancient Oaks, Zionsville, Macungie and Alburtis.

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.

&&

LAT...LON 4046 7582 4054 7576 4055 7573 4053 7545
      4044 7552 4045 7553 4035 7561 4038 7574
      4041 7584
TIME...MOT...LOC 1934Z 262DEG 11KT 4047 7565 

HAIL...0.75IN
WIND...60MPH
 
$$

CMS

070 
WWUS51 KPHI 271956
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
356 PM EDT FRI JUL 27 2018

PAC011-077-272005-
/O.EXP.KPHI.SV.W.0056.000000T0000Z-180727T2000Z/
Berks PA-Lehigh PA-
356 PM EDT FRI JUL 27 2018

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BERKS AND
SOUTHEASTERN LEHIGH COUNTIES WILL EXPIRE AT 400 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

A severe thunderstorm watch remains in effect until 1000 PM EDT for
eastern and southeastern Pennsylvania.

LAT...LON 4046 7582 4054 7576 4055 7573 4053 7545
      4044 7552 4045 7553 4035 7561 4038 7574
      4041 7584
TIME...MOT...LOC 1955Z 281DEG 2KT 4047 7564 

$$

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 9:50 AM EDT	Flash Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	13 hr
Jul 27, 12:17 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	2 hr
Jul 27, 12:35 PM EDT	Flash Flood Warning	PHI	Monroe	63 min
Jul 27, 1:02 PM EDT	Areal Flood Advisory	PHI	Berks	3 hr
Jul 27, 1:08 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	37 min
Jul 27, 1:19 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery	4 hr
Jul 27, 1:42 PM EDT	Special Weather Statement	PHI	Montgomery	48 min
Jul 27, 3:47 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh	4 hr
Jul 27, 3:54 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Jul 27, 4:27 PM EDT	Special Weather Statement	PHI	Philadelphia	33 min
Jul 27, 4:33 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	27 min
Jul 27, 4:43 PM EDT	Areal Flood Advisory	PHI	Bucks, Montgomery, Philadelphia	5 hr
Jul 27, 4:44 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	7 hr
Jul 27, 5:00 PM EDT	Flash Flood Warning	PHI	Monroe	3 hr
Jul 27, 5:13 PM EDT	Special Weather Statement	PHI	Monroe	47 min
Jul 27, 5:27 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Northampton	4 hr
Jul 27, 5:43 PM EDT	Special Weather Statement	PHI	Lehigh	47 min
Jul 27, 6:03 PM EDT	Severe Thunderstorm Warning	PHI	Chester	42 min
Jul 27, 6:06 PM EDT	Areal Flood Advisory	PHI	Berks, Chester	3 hr
Jul 27, 6:36 PM EDT	Special Weather Statement	PHI	Berks	39 min
Jul 27, 6:40 PM EDT	Severe Thunderstorm Warning	PHI	Berks	50 min
Jul 27, 7:03 PM EDT	Flash Flood Warning	PHI	Berks	3 hr
Jul 27, 7:09 PM EDT	Severe Thunderstorm Warning	PHI	Chester	51 min
Jul 27, 7:37 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Delaware, Lehigh, Montgomery	116 min
Jul 27, 7:46 PM EDT	Special Weather Statement	PHI	Montgomery	44 min
Jul 27, 7:49 PM EDT	Areal Flood Warning	PHI	Berks	4 hr
Jul 27, 7:49 PM EDT	Special Weather Statement	PHI	Berks	41 min
Jul 27, 7:53 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh, Montgomery	110 min
Jul 27, 7:55 PM EDT	Areal Flood Advisory	PHI	Bucks, Lehigh, Montgomery, Northampton	108 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2018 Every severe thunderstorm warning in 2018

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.