Alert archive / Pennsylvania / Special Weather Statements in 2019

Special Weather Statement, NWS State College, PA

August 7, 2019Lancaster County, Pennsylvania

NWS State College, PA issued this special weather statement at Aug 7, 2019, 2:46 PM EDT for Lancaster County, Pennsylvania. It was in force for 29 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: Aug 7, 2019, 2:46 PM EDT (18:46 UTC)
Expired: Aug 7, 2019, 3:15 PM EDT
In force: 29 min
Issued by: NWS State College, PA

County Lancaster County, PA

The radar

The Philadelphia radar (KDIX), 147 km from the middle of the area, began a volume at 18:46 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.8 hours before the alert went out and 174 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: 371 J/kg
Mixed-layer CIN: -114 J/kg
Mixed-layer LCL: 1115 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 7, 6:49 AM EDT, 7 hours 57 minutes earlier.

Area forecast discussion, Aug 7, 6:49 AM EDT, 7 hours 57 minutes before

Area Forecast Discussion
National Weather Service State College PA
649 AM EDT Wed Aug 7 2019

.SYNOPSIS...
Higher moisture/humidity will settle in through Thursday. A
strong cold front will move in from the west on Wednesday and be
followed by a second cold front on Thursday. Cooler and drier
air is expected for the end of the week under high pressure.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Upper trough slowly plodding through the Great Lakes region will
keep scattered showers and thunderstorms across central
Pennsylvania today as we will remain on the east side of the
trough.

While showers and thunderstorms decreased in intensity
overnight, coverage remained in tact. Expect current areas of
precipitation to increase in coverage as the day goes on. Latest
SPC continues a marginal risk through the eastern half of
central PA and SLGT risk for the SErn counties. Maxes on Wed
will be dependent on how much sun can break through, and how
fast the convection in the east develops. Will keep on with 70s
NW half and upper 80s in the SE.

Areas of patchy fog are likely through sunrise.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY NIGHT/...
The unsettled pattern will continue into Thursday as another
cold front comes through, accompanied by another round of
showers and thunderstorms later in the day. There will be a late
afternoon/evening strong wind threat mainly over the NW as the
upper trough drops over the region with a potent shortwave on
the leading edge.

&&

.LONG TERM /FRIDAY THROUGH TUESDAY/...
As front moves away and northwest flow takes over under the
trough, cooler and drier air will move in. But low risk of
isolated showers will persist into late week with cold pool
aloft keeping just enough instability overhead.

Weekend looking pretty quiet with surface high pressure and some
ridging working into the upper flow, then flow becomes more
westerly for next week with a an approaching weak frontal
system bringing increased risk for showers/tstms.

&&

.AVIATION /12Z WEDNESDAY THROUGH SUNDAY/...
Areas of low stratus clouds and fog aided by overnight
convection will persist through about 13-14Z. VFR is expected
from mid-morning into early afternoon. Similar to Tuesday,
showers and thunderstorms are likely to develop this afternoon,
with restrictions expected.

Light winds early today will become W-SW at 5-10 kt. The
exception to this is in the Susquehanna Valley (KPIT, KMDT, and
KLNS terminals), where S-SE winds are foreseen on Wednesday.

.Outlook...

Thu...Mainly VFR, but a chance of showers and storms across the
northwest.

Fri-Sun...No sig wx.

&&

.CTP WATCHES/WARNINGS/ADVISORIES...
None.

&&

SYNOPSIS...Dangelo
NEAR TERM...DeVoir/Tyburski
SHORT TERM...Dangelo
LONG TERM...Ceru/RXR
AVIATION...Jurewicz/Gartner

Hazardous weather outlook, Aug 7, 2:33 PM EDT, 13 minutes before

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In the hours before

Special weather statement, Aug 7, 1:08 PM EDT, 1 hour 38 minutes before

Special Weather Statement
National Weather Service State College PA
108 PM EDT Wed Aug 7 2019

PAZ057-059-071745-
Lebanon PA-Dauphin PA-
108 PM EDT Wed Aug 7 2019

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF DAUPHIN AND LEBANON
COUNTIES UNTIL 145 PM EDT...

At 107 PM EDT, Doppler radar indicated a strong thunderstorm over
Valley View, moving northeast at 25 mph.

Wind gusts 40 to 50 mph and pea size hail are possible.

Locations impacted include...
Hershey, Palmyra, Linglestown, Annville, Hummelstown, Paxtonia,
Rutherford, Skyline View, Campbelltown, Harper Tavern, Fort
Indiantown Gap, Penn National Race Course, Ono, Penn State College Of
Medicine and Hershey Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4021 7671 4032 7679 4048 7658 4036 7646
TIME...MOT...LOC 1707Z 240DEG 20KT 4031 7664

RXR

Special weather statement, Aug 7, 1:26 PM EDT, 1 hour 20 minutes before

Special Weather Statement
National Weather Service State College PA
126 PM EDT Wed Aug 7 2019

PAZ058-059-071800-
Lebanon PA-Schuylkill PA-
126 PM EDT Wed Aug 7 2019

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF SCHUYLKILL AND LEBANON
COUNTIES UNTIL 200 PM EDT...

At 126 PM EDT, Doppler radar indicated a strong thunderstorm over
Lickdale, moving northeast at 25 mph.

Wind gusts 40 to 50 mph and pea size hail are possible.

Locations impacted include...
Pine Grove, Tremont, Fredericksburg, Donaldson, Lickdale, Fort
Indiantown Gap, Jonestown, Ravine, Newtown and Summit Station.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4052 7626 4052 7634 4049 7644 4042 7631
      4036 7646 4048 7658 4068 7636 4054 7618
TIME...MOT...LOC 1726Z 228DEG 20KT 4042 7650

Banghoff

Special weather statement, Aug 7, 2:46 PM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 11:20 PM EDT	Areal Flood Advisory	CTP	Columbia, Montour, Northumberland, Snyder, Union	115 min
Aug 7, 1:08 PM EDT	Special Weather Statement	CTP	Lebanon	37 min
Aug 7, 1:26 PM EDT	Special Weather Statement	CTP	Lebanon	34 min
Aug 7, 1:39 PM EDT	Severe Thunderstorm Warning	CTP	Lebanon	36 min
Aug 7, 2:47 PM EDT	Special Weather Statement	CTP	Adams	28 min
Aug 7, 7:34 PM EDT	Special Weather Statement	CTP	Centre	26 min

Nearby

Special Weather Statements in Pennsylvania, 2019 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.