Alert archive / Pennsylvania / Special Weather Statements in 2018

Special Weather Statement, NWS State College, PA

August 8, 2018Adams County, Pennsylvania

NWS State College, PA issued this special weather statement at Aug 8, 2018, 9:27 PM EDT for Adams County, Pennsylvania. It was in force for 33 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 8, 2018, 9:27 PM EDT (01:27 UTC)
Expired
Aug 8, 2018, 10:00 PM EDT
In force
33 min
Issued by
NWS State College, PA

County Adams County, PA

The radar

The Sterling radar (KLWX), 93 km from the middle of the area, began a volume at 01:30 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 00:00Z, 1.5 hours before the alert went out and 94 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-pSkew-T log-p diagram, Washington/Dulle, VA at 00:00Z on 2018-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1465 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2018-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1465 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
1224 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.4

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 8, 9:04 PM EDT, 23 minutes earlier.

Area forecast discussion, Aug 8, 9:04 PM EDT, 23 minutes before
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Hazardous weather outlook, Aug 8, 2:45 PM EDT, 6 hours 42 minutes before
Hazardous Weather Outlook
National Weather Service State College PA
245 PM EDT Wed Aug 8 2018

PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053-
056>059-063>066-091845-
Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield-
Northern Centre-Southern Centre-Cambria-Blair-Huntingdon-Mifflin-
Juniata-Somerset-Bedford-Fulton-Franklin-Tioga-Northern Lycoming-
Sullivan-Southern Clinton-Southern Lycoming-Union-Snyder-Montour-
Northumberland-Columbia-Perry-Dauphin-Schuylkill-Lebanon-Cumberland-
Adams-York-Lancaster-
245 PM EDT Wed Aug 8 2018

This Hazardous Weather Outlook is for central Pennsylvania.

.DAY ONE...This Afternoon and Tonight.

Scattered thunderstorms this afternoon and evening will pose an
isolated risk of wind damage and localized flash flooding.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Aug 8, 6:01 PM EDT, 3 hours 26 minutes before
Special Weather Statement
National Weather Service State College PA
601 PM EDT WED AUG 8 2018

PAZ033-082230-
Somerset PA-
601 PM EDT WED AUG 8 2018

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF SOMERSET COUNTY UNTIL
630 PM EDT...

At 600 PM EDT, Doppler radar indicated a strong thunderstorm near
South Connellsville, moving east at 30 mph.

Wind gusts up to 50 mph are possible.

This strong thunderstorm will be near...
  Ursina around 620 PM EDT.
  New Centerville and Mount Davis around 630 PM EDT.

Other locations impacted by this storm include Casselman, Rockwood,
Confluence and Seven Springs.

LAT...LON 3978 7938 3979 7938 3978 7936 3980 7937
      3982 7937 3985 7942 3986 7942 3990 7940
      4001 7932 3997 7905 3972 7915 3972 7918
TIME...MOT...LOC 2200Z 286DEG 27KT 3994 7949

KF
Special weather statement, Aug 8, 6:31 PM EDT, 2 hours 56 minutes before
Special Weather Statement
National Weather Service State College PA
631 PM EDT WED AUG 8 2018

PAZ033-082300-
Somerset PA-
631 PM EDT WED AUG 8 2018

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF SOMERSET COUNTY UNTIL
700 PM EDT...

At 631 PM EDT, Doppler radar indicated a strong thunderstorm near
Mount Davis, moving southeast at 30 mph.

Wind gusts up to 50 mph are possible.

This strong thunderstorm will be near...
  Mount Davis around 640 PM EDT.
  Meyersdale around 650 PM EDT.

Other locations impacted by this storm include Wellersburg,
Salisbury, Callimont, Casselman and Garrett.

LAT...LON 3972 7926 3977 7936 3993 7926 3979 7877
      3972 7881
TIME...MOT...LOC 2231Z 296DEG 28KT 3982 7923

KF
Special weather statement, Aug 8, 7:08 PM EDT, 2 hours 19 minutes before
Special Weather Statement
National Weather Service State College PA
708 PM EDT WED AUG 8 2018

PAZ034-082345-
Bedford PA-
708 PM EDT WED AUG 8 2018

...A STRONG THUNDERSTORM WILL AFFECT PARTS OF BEDFORD COUNTY UNTIL
745 PM EDT...

At 708 PM EDT, Doppler radar indicated a strong thunderstorm near
Clearville, moving east at 25 mph.

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

This strong thunderstorm will be near...
  Clearville around 720 PM EDT.
  Everett around 725 PM EDT.
  Breezewood around 735 PM EDT.

Other locations impacted by this storm include Rainsburg.

LAT...LON 3984 7859 4002 7856 4001 7820 3999 7823
      3995 7824 3990 7827 3983 7829 3978 7833
TIME...MOT...LOC 2308Z 278DEG 22KT 3992 7848

KF
Special weather statement, Aug 8, 7:51 PM EDT, 1 hour 36 minutes before
Special Weather Statement
National Weather Service State College PA
751 PM EDT WED AUG 8 2018

PAZ036-064-090030-
Adams PA-Franklin PA-
751 PM EDT WED AUG 8 2018

...SPECIAL WEATHER STATEMENT...

At 749 PM EDT, Doppler radar indicated a strong thunderstorm near
Mont Alto, moving east at 20 mph.

Very heavy rain, winds in excess of 30 mph, and pea sized hail are
possible.

This strong thunderstorm will be near...
  Carroll Valley around 805 PM EDT.
  Orrtanna and Cashtown around 810 PM EDT.

Other locations impacted by this storm include McKnightstown,
Fairfield, Quincy, Penn State Mont Alto and Liberty Mountain Resort.

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. Additional heavy downpours are possible following this
storm.

&&

LAT...LON 3974 7763 3987 7760 3991 7751 3989 7725
      3972 7731 3972 7755
TIME...MOT...LOC 2349Z 283DEG 18KT 3981 7751

MC/KF
Local storm report, Aug 8, 9:19 PM EDT, 8 minutes before
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Special weather statement, Aug 8, 9:27 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.

IssuedProductOfficeCountiesLasted
Aug 8, 8:01 PM EDTSevere Thunderstorm WarningCTPAdams, Franklin36 min
Aug 8, 8:39 PM EDTAreal Flood AdvisoryCTPAdams, Franklin2 hr

Nearby

Special Weather Statements in Pennsylvania, 2018Every special weather statement 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.