Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 73, NWS State College, PA

June 19, 20175 counties in Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 19, 2017, 1:49 PM EDT for 5 counties in Pennsylvania. It was in force for 56 min. 8 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: Jun 19, 2017, 1:49 PM EDT (17:49 UTC)
Expired: Jun 19, 2017, 2:45 PM EDT
In force: 56 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Dauphin County, PA, Lancaster County, PA, Lebanon County, PA, Schuylkill County, PA, York County, PA

The radar

The State College radar (KCCX), 156 km from the middle of the area, began a volume at 17:52 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
Jun 19, 1:50 PM EDT	TSTM WND DMG	Middletown, PA	TREE ON WIRES ON WAYNE AVE
Jun 19, 1:53 PM EDT	TSTM WND DMG	Oakmont, PA	TREES AND WIRES DOWN
Jun 19, 2:10 PM EDT	TSTM WND DMG	2 W Cleona, PA	TREES DOWN ON CARS
Jun 19, 2:23 PM EDT	TSTM WND DMG	Lebanon, PA	TREES DOWN
Jun 19, 2:30 PM EDT	TSTM WND DMG	Annville, PA	MULTIPLE TREES DOWN ALONG ROUTE 422 BETWEEN LEBANON AND PALMYRA
Jun 19, 2:30 PM EDT	TSTM WND DMG	Ephrata, PA	TREE DOWN ON A HOUSE IN EPHRATA
Jun 19, 2:45 PM EDT	TSTM WND DMG	Colebrook, PA	TREES AND WIRES DOWN ON MINE ROAD AND RTE 241 INTERSECTION
Jun 19, 2:45 PM EDT	TSTM WND DMG	Mount Gretna, PA	TREES AND LARGE LIMBS DOWN ON TIMBER AND HILLCREST

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 8 storm reports to this severe thunderstorm warning; the first came 1 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 19, 11:13 AM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 5.8 hours before the alert went out and 160 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: 448 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1049 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

847 
WUUS51 KCTP 191749
SVRCTP
PAC043-071-075-107-133-191845-
/O.NEW.KCTP.SV.W.0073.170619T1749Z-170619T1845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service State College PA
149 PM EDT MON JUN 19 2017

The National Weather Service in State College PA has issued a

* Severe Thunderstorm Warning for...
  Lancaster County in south central Pennsylvania...
  Southern Schuylkill County in central Pennsylvania...
  York County in south central Pennsylvania...
  Dauphin County in south central Pennsylvania...
  Lebanon County in south central Pennsylvania...

* Until 245 PM EDT

* At 148 PM EDT, severe thunderstorms were located along a line
  extending from near Littlestown to Royalton to Penbrook to near
  Dehart Dam, moving east at 40 mph.

  HAZARD...70 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is possible. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings. 

* Locations impacted include...
  Parkville, New Holland, Manheim, Hanover, Myerstown, Ephrata,
  Palmyra, Colonial Park, Progress and Lebanon.

This includes the following Interstates...
 The Pennsylvania Turnpike from mile markers 245 to 295.
 Interstate 78 from mile markers 0 to 8.
 Interstate 81 from mile markers 66 to 106.
 Interstate 83 between mile markers 1 and 31...and from mile markers
43 to 50.
 Interstate 283 from mile markers 0 to 2.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

These storms are producing destructive winds and large damaging hail.
SEEK SHELTER NOW inside a sturdy structure and stay away from
windows!
 
&&

LAT...LON 3983 7700 3986 7696 3992 7697 4015 7678
      4028 7692 4053 7686 4075 7581 4070 7582
      4063 7600 4057 7602 4049 7644 4014 7587
      4010 7594 3987 7599 3973 7609 3972 7699
TIME...MOT...LOC 1748Z 258DEG 36KT 3973 7705 4017 7670 4027 7684 4047
7679

HAIL...1.00IN
WIND...70MPH
 
$$

La Corte

1 follow-up statement

255 
WWUS51 KCTP 191831
SVSCTP

Severe Weather Statement
National Weather Service State College PA
231 PM EDT MON JUN 19 2017

PAC043-191840-
/O.CAN.KCTP.SV.W.0073.000000T0000Z-170619T1845Z/
Dauphin PA-
231 PM EDT MON JUN 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR DAUPHIN COUNTY IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until 800 PM EDT for
south central and central Pennsylvania.

LAT...LON 3996 7662 4015 7651 4034 7649 4060 7650
      4075 7581 4070 7582 4063 7600 4057 7602
      4049 7644 4014 7587 4010 7594 3987 7599
      3973 7609 3973 7680
TIME...MOT...LOC 1830Z 258DEG 36KT 3982 7653 4025 7618 4035 7631 4055
7626

$$

PAC071-075-107-133-191845-
/O.CON.KCTP.SV.W.0073.000000T0000Z-170619T1845Z/
Lancaster PA-Schuylkill PA-York PA-Lebanon PA-
231 PM EDT MON JUN 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR LANCASTER...SOUTHERN SCHUYLKILL...SOUTHEASTERN YORK AND CENTRAL
LEBANON COUNTIES...

At 230 PM EDT, severe thunderstorms were located along a line
extending from near Cross Roads to near Denver to Myerstown to near
Friedensburg, moving east at 40 mph.

HAZARD...70 mph wind gusts and quarter size hail. 

SOURCE...Emergency Management. 

IMPACT...Hail damage to vehicles is possible. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings. 

Locations impacted include...
Cornwall, Red Lion, New Holland, Manheim, Dallastown, Myerstown,
Ephrata, Lebanon, Lititz and Akron.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

These storms are producing destructive winds.
SEEK SHELTER NOW inside a sturdy structure and stay away from
windows.
 
&&

LAT...LON 3996 7662 4015 7651 4034 7649 4060 7650
      4075 7581 4070 7582 4063 7600 4057 7602
      4049 7644 4014 7587 4010 7594 3987 7599
      3973 7609 3973 7680
TIME...MOT...LOC 1830Z 258DEG 36KT 3982 7653 4025 7618 4035 7631 4055
7626

HAIL...1.00IN
WIND...70MPH
 
$$

Dangelo

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS State College, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 19, 10:24 AM EDT, 3 hours 25 minutes earlier.

Area forecast discussion, Jun 19, 10:24 AM EDT, 3 hours 25 minutes before

Area Forecast Discussion
National Weather Service State College PA
1024 AM EDT Mon Jun 19 2017

.SYNOPSIS...

An upper level trough will shift east across the Great Lakes,
pushing a cold front through Pennsylvania today. The upper
trough will swing through the area during the middle of the
week, then lift out by Friday.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...

A diffuse cold front is entering the CWA as of mid morning. A
fairly solid area of showers extends from central NY state down
through the western 1/3 of my forecast area. There are embedded
thunderstorms and even the hint of a weak bowing segment of a
line at 10AM between UNV and FIG.

The focus of the convection will continue to shift eastward into
the Central Mountains as the morning progresses, and into the
Susq Vally by mid day and early afternoon. It's this area of
highest concern with deep tropical moisture and sunshine
already pushing temperatures into the 80s.

Sunshine and associated diurnal heating will result in moderate
CAPEs across the southeast portion of the forecast area by
early afternoon. SPC has a slight risk over eastern counties,
with a wedge of enhanced risk over Lancaster/York counties. The
HRRR and RAP both show the instability shifting east rapidly
implying this should be a relatively early in the day event.

The unstable environment, combined with anomalous PWATS,
also supports the idea of tropical downpours. Convection-
allowing models showing spot amounts of around 2-3 inches over
the Lower Susq Valley, which could result in flooding,
especially in urban areas, but recent dryness and high FFG
values suggest significant flooding elsewhere may not be very
likely.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM TUESDAY/...
Cooler/drier conditions tonight, as the cold front pushes east
of the region. However, will have to retain a low probability
of showers for much of the night associated with passage of
upper level trough.

Another shortwave rotating through base of trough will swing
through central Pa late Tuesday, likely accompanied by a few
more showers and possible tsra, mainly across the northwest
mountains. Model soundings showing a well mixed boundary layer
and 850 temps between 10-12C, which should support max temps
from the low 70s over the northwest mountains, to the low 80s
across the Susq Valley.

&&

.LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/...
One last day under influence of upper trough on Wednesday, with
relatively cool weather and a low chance of showers, then trough
lifts out. 00Z NAEFS showing an area of low pressure passing
north of Pa late in the week. GEFS plumes support a chance of
showers/storms with warm front passage Thursday or Thursday
night, then a better chance of shower/storms Friday, as trailing
cold front pushes into the area.

Bulk of med range guidance currently leaning toward dry weather
Saturday, followed by possible showers/storms by late in the
weekend, as another sfc low tracks north of Pa and trailing
cold front tracks across Pa.

&&

.AVIATION /14Z MONDAY THROUGH FRIDAY/...
An upper level trough will shift east across the Great Lakes,
pushing a cold front through Pennsylvania today, with high
likelihood for strong to potentially severe thunderstorms over
mainly eastern half of CWA.

But first, ceiling restrictions over mainly western sections
will spread into central mountains through mid morning as area
of showers pushes through. Restrictions will lift this afternoon
with cold fropa, then scattered showers will again become a poss
over NW Mtns late in the day.

For the east, the advancing line of showers will develop into a
potentially potent line of thunderstorms around or just east of
an AOO-UNV-IPT line midday and advance across the Susq Valley
through mid/late afternoon. Wind gusts to 60-70 mph likely in
strongest storms.

Generally VFR conditions behind the front tonight, with cig
restrictions possible in NW Mtns and some patchy fog poss
areawide.

.OUTLOOK...

Tue...Sct SHRA NW. No sig wx.

Wed...Mainly dry with VFR conditions.

Thu...Sct SHRA and storms...mainly N.

Fri...Sct showers and thunderstorms.

&&

.CTP WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch from 2 PM this afternoon to 9 PM EDT this
evening for PAZ059-064>066.

&&

SYNOPSIS...Fitzgerald/La Corte
NEAR TERM...Fitzgerald/La Corte
SHORT TERM...Fitzgerald
LONG TERM...Fitzgerald
AVIATION...RXR

Hazardous weather outlook, Jun 19, 11:20 AM EDT, 2 hours 29 minutes before

Hazardous Weather Outlook
National Weather Service State College PA
1120 AM EDT Mon Jun 19 2017

PAZ036-051>053-056>058-063-201530-
Franklin-Montour-Northumberland-Columbia-Perry-Dauphin-Schuylkill-
Cumberland-
1120 AM EDT Mon Jun 19 2017

...SEVERE THUNDERSTORM WATCH 354 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This Afternoon and Tonight.

Please listen to NOAA Weather Radio or go to
weather.gov/StateCollege on the internet for more
information about the following hazards.

   Severe Thunderstorm Watch.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PAZ059-064>066-201530-
Lebanon-Adams-York-Lancaster-
1120 AM EDT Mon Jun 19 2017

...SEVERE THUNDERSTORM WATCH 354 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...
...FLASH FLOOD WATCH IN EFFECT UNTIL 9 PM EDT THIS EVENING...

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This Afternoon and Tonight.

Please listen to NOAA Weather Radio or go to
weather.gov/StateCollege on the internet for more
information about the following hazards.

   Severe Thunderstorm Watch.
   Flash Flood Watch.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PAZ004>006-010>012-017>019-024>028-033>035-037-041-042-045-046-049-
050-201530-
Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield-
Northern Centre-Southern Centre-Cambria-Blair-Huntingdon-Mifflin-
Juniata-Somerset-Bedford-Fulton-Tioga-Northern Lycoming-Sullivan-
Southern Clinton-Southern Lycoming-Union-Snyder-
1120 AM EDT Mon Jun 19 2017

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This Afternoon and Tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Jun 19, 12:50 PM EDT, 59 minutes before

Special Weather Statement
National Weather Service State College PA
1250 PM EDT MON JUN 19 2017

PAZ066-191700-
Lancaster PA-
1250 PM EDT MON JUN 19 2017

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF LANCASTER COUNTY UNTIL
100 PM EDT...

At 1249 PM EDT, Doppler radar indicated a strong thunderstorm near
Wernersville, moving northeast at 30 mph.

Nickel size hail and wind gusts up to 50 mph are possible.

Locations impacted include...
Ephrata, Denver, Adamstown, Reamstown, Schoeneck, Bowmansville,
Fivepointville and Reinholds.

LAT...LON 4015 7616 4029 7622 4031 7616 4031 7615
      4018 7594
TIME...MOT...LOC 1649Z 235DEG 43KT 4028 7611

Grumm

Local storm report, Jun 19, 1:05 PM EDT, 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
105 PM EDT MON JUN 19 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0100 PM     TSTM WND DMG     HARRISBURG              40.28N  76.88W
06/19/2017                   DAUPHIN            PA   911 CALL CENTER

            TREE ON WIRES ON 4TH STREET

&&

EVENT NUMBER CTP1701240

PAH

Local storm report, Jun 19, 1:14 PM EDT, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
114 PM EDT MON JUN 19 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0105 PM     TSTM WND DMG     HALIFAX                 40.47N  76.93W
06/19/2017                   DAUPHIN            PA   911 CALL CENTER

            POLE SNAPPPED WIRES DOWN BLOCKING ROADWAY

&&

EVENT NUMBER CTP1701241

PAH

Local storm report, Jun 19, 1:17 PM EDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
117 PM EDT MON JUN 19 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0115 PM     TSTM WND DMG     BENDERSVILLE            39.98N  77.25W
06/19/2017                   ADAMS              PA   TRAINED SPOTTER

            TRANSFORMER AND WIRES DOWN NEAR BENDERSVILLE POST
            OFFICE

&&

EVENT NUMBER CTP1701242

PAH

Local storm report, Jun 19, 1:20 PM EDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
120 PM EDT MON JUN 19 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0119 PM     TSTM WND DMG     ASPERS                  39.98N  77.22W
06/19/2017                   ADAMS              PA   911 CALL CENTER

            NUMEROUS TREES DOWN ALONG PINE GROVE ROAD IN ASPERS

&&

EVENT NUMBER CTP1701243

PAH

Local storm report, Jun 19, 1:23 PM EDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
123 PM EDT MON JUN 19 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1250 PM     TSTM WND DMG     HALIFAX                 40.47N  76.93W
06/19/2017                   DAUPHIN            PA   911 CALL CENTER

            NUMEROUS TREES DOWN OVER RTE 147 BETWEEN HALIFAX AND
            MILLERSVILLE

&&

EVENT NUMBER CTP1701244

PAH

The office that day

Everything else NWS State College, PA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 18, 8:00 PM EDT	Special Weather Statement	CTP	Lycoming, Union	45 min
Jun 18, 8:15 PM EDT	Special Weather Statement	CTP	Warren	30 min
Jun 18, 8:20 PM EDT	Special Weather Statement	CTP	Mifflin	25 min
Jun 18, 8:44 PM EDT	Special Weather Statement	CTP	Mifflin, Montour, Northumberland, Snyder, Sullivan, Union	46 min
Jun 18, 8:46 PM EDT	Special Weather Statement	CTP	Warren	29 min
Jun 18, 9:20 PM EDT	Areal Flood Advisory	CTP	Montour, Northumberland, Union	3 hr
Jun 18, 9:29 PM EDT	Special Weather Statement	CTP	Columbia, Montour, Sullivan	46 min
Jun 18, 9:56 PM EDT	Special Weather Statement	CTP	Centre	19 min
Jun 18, 10:20 PM EDT	Areal Flood Advisory	CTP	Clinton, Lycoming	3 hr
Jun 18, 11:22 PM EDT	Special Weather Statement	CTP	Union	23 min
Jun 18, 11:41 PM EDT	Flash Flood Warning	CTP	Lycoming	3 hr
Jun 18, 11:55 PM EDT	Special Weather Statement	CTP	Sullivan	35 min
Jun 19, 12:05 AM EDT	Areal Flood Advisory	CTP	Sullivan	3 hr
Jun 19, 12:35 AM EDT	Areal Flood Advisory	CTP	Elk, McKean, Warren	3 hr
Jun 19, 5:18 AM EDT	Flash Flood Watch	CTP	Adams, Lancaster, Lebanon, York	11 hr
Jun 19, 10:32 AM EDT	Special Weather Statement	CTP	Clinton, Tioga	58 min
Jun 19, 10:53 AM EDT	Special Weather Statement	CTP	Dauphin	37 min
Jun 19, 11:12 AM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lebanon, Schuylkill	63 min
Jun 19, 11:32 AM EDT	Special Weather Statement	CTP	Tioga	28 min
Jun 19, 12:19 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Dauphin, Lebanon, Montour, Northumberland, Schuylkill	56 min
Jun 19, 12:26 PM EDT	Special Weather Statement	CTP	Adams, Cumberland, Franklin	49 min
Jun 19, 12:40 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Franklin, York	65 min
Jun 19, 12:50 PM EDT	Special Weather Statement	CTP	Berks	10 min
Jun 19, 1:17 PM EDT	Areal Flood Advisory	CTP	Dauphin, Lebanon, Perry, Schuylkill	3 hr
Jun 19, 1:27 PM EDT	Tornado Warning	CTP	Cumberland, Dauphin, Lancaster, Lebanon, Schuylkill, York	48 min
Jun 19, 2:17 PM EDT	Special Weather Statement	CTP	Schuylkill	28 min
Jun 19, 2:24 PM EDT	Severe Thunderstorm Warning	CTP	Schuylkill	44 min
Jun 19, 2:45 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	30 min
Jun 19, 3:35 PM EDT	Special Weather Statement	CTP	Lancaster	25 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.