Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 400, NWS Philadelphia/Mount Holly

October 31, 2019Berks County, Chester County, Montgomery County, Pennsylvania; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 31, 2019, 9:35 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania; Cecil County, Maryland. It was in force for 55 min. 5 reports 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: Oct 31, 2019, 9:35 PM EDT (01:35 UTC)
Expired: Oct 31, 2019, 10:30 PM EDT
In force: 55 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cecil County, MD, Berks County, PA, Chester County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 132 km from the middle of the area, began a volume at 01:35 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
Oct 31, 10:05 PM EDT	TSTM WND DMG	1 Ne Kutztown, PA	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN. TIME ESTIMATED FROM RADAR.
Oct 31, 10:10 PM EDT	TSTM WND DMG	2 Wsw Amity Gardens, PA	DOWNED TREE ON HILLVIEW ROAD. TIME ESTIMATED FROM RADAR.
Oct 31, 10:16 PM EDT	TSTM WND DMG	3 Wsw Cedarville, PA	DOWNED TREE NEAR THE INTERSECTION OF HILL CAMP ROAD AND CHESTNUT COURT. TIME ESTIMATED FROM RADAR.
Oct 31, 10:17 PM EDT	TSTM WND DMG	1 Sse East Nantmeal Twp, PA	DOWNED TREE ON GREENRIDGE ROAD NEAR FONT ROAD. TIME ESTIMATED FROM RADAR.
Oct 31, 10:23 PM EDT	TSTM WND DMG	2 Sw East Brandywine Tw, PA	LARGE TREE DOWN NEAR THE INTERSECTION OF REECEVILLE ROAD AND CALN MEETINGHOUSE ROAD. 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
Oct 31, 7:56 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.6 hours before the alert went out and 168 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: 529 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 827 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: 623 m²/s²
0-3 km storm-relative helicity: 752 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 9.8

Open this sounding in Storm Lab

The text

As transmitted.

639 
WUUS51 KPHI 010135
SVRPHI
MDC015-PAC011-029-091-010230-
/O.NEW.KPHI.SV.W.0400.191101T0135Z-191101T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
935 PM EDT Thu Oct 31 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Cecil County in northeastern Maryland...
  Eastern Berks County in eastern Pennsylvania...
  Northwestern Montgomery County in southeastern Pennsylvania...
  Chester County in southeastern Pennsylvania...

* Until 1030 PM EDT.

* At 934 PM EDT, severe thunderstorms were located along a line
  extending from New Holland to Towson, moving northeast at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Reading, Calvert, Pottstown, Coatesville, Wyomissing, Downingtown,
  Birdsboro, Oxford, Kutztown, Royersford, Fleetwood, Laureldale,
  Parkesburg, East Greenville, West Grove, Rising Sun, Topton, Honey
  Brook, Schwenksville and Elverson.

This includes Interstate 95 in Maryland between mile markers 91 and
98.
 
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 3973 7610 3987 7599 3995 7600 4004 7593
      4011 7594 4014 7588 4025 7605 4058 7573
      4035 7537 3955 7604 3955 7608 3972 7623
TIME...MOT...LOC 0134Z 233DEG 45KT 4009 7606 3941 7663 

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

Iovino

1 follow-up statement

651 
WWUS51 KPHI 010202
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1002 PM EDT Thu Oct 31 2019

MDC015-PAC011-029-091-010230-
/O.CON.KPHI.SV.W.0400.000000T0000Z-191101T0230Z/
Cecil MD-Berks PA-Montgomery PA-Chester PA-
1002 PM EDT Thu Oct 31 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT
FOR NORTHWESTERN CECIL...EASTERN BERKS...NORTHWESTERN MONTGOMERY AND
CHESTER COUNTIES...

At 1001 PM EDT, severe thunderstorms were located along a line
extending from near Cedarville to near Bel Air North, moving
northeast at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Reading, Calvert, Pottstown, Coatesville, Wyomissing, Downingtown,
Birdsboro, Oxford, Kutztown, Royersford, Fleetwood, Laureldale,
Parkesburg, East Greenville, West Grove, Rising Sun, Topton, Honey
Brook, Schwenksville and Elverson.

This includes Interstate 95 in Maryland between mile markers 91 and
98.
 
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 3973 7610 3987 7599 3995 7600 4004 7593
      4011 7594 4014 7588 4025 7605 4058 7573
      4035 7537 3955 7604 3955 7608 3972 7623
TIME...MOT...LOC 0201Z 233DEG 45KT 4028 7572 3961 7629 

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

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 31, 8:11 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh	64 min
Oct 31, 8:58 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	62 min
Oct 31, 9:41 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Oct 31, 9:56 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	4 hr
Oct 31, 9:56 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	64 min
Oct 31, 10:23 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery	67 min
Oct 31, 10:43 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	77 min
Oct 31, 10:45 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	4 hr
Oct 31, 11:08 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	4 hr
Oct 31, 11:14 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe, Northampton	4 hr
Oct 31, 11:15 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	60 min
Oct 31, 11:32 PM EDT	Tornado Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	14 min
Oct 31, 11:54 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	66 min
Oct 31, 11:54 PM EDT	Tornado Warning	PHI	Bucks	36 min
Nov 1, 1:43 AM EDT	Areal Flood Warning	PHI	Berks	4 hr
Nov 1, 2:28 AM EDT	River Flood Warning	PHI	Chester	4 hr
Nov 1, 3:02 AM EDT	Areal Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	5 hr
Nov 1, 3:06 AM EDT	Areal Flood Warning	PHI	Carbon, Monroe, Northampton	4 hr
Nov 1, 3:31 AM EDT	Freeze Watch	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	6 hr
Nov 1, 9:12 AM EDT	Freeze Warning	PHI	Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more	25 hr
Nov 1, 3:16 PM EDT	Frost Advisory	PHI	Philadelphia	19 hr
Oct 31, 10:47 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	73 min
Oct 31, 11:10 PM EDT	Tornado Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	35 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Severe Thunderstorm Warnings in Maryland, 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.