Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 36, NWS State College, PA

June 9, 2009Dauphin County, Lebanon County, Perry County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 9, 2009, 1:19 PM EDT for Dauphin County, Lebanon County, Perry County, Pennsylvania. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 9, 2009, 1:19 PM EDT (17:19 UTC)
Expired: Jun 9, 2009, 2:00 PM EDT
In force: 41 min
Issued by: NWS State College, PA
Area: Storm-based polygon

Counties Dauphin County, PA, Lebanon County, PA, Perry County, PA

The radar

The State College radar (KCCX), 115 km from the middle of the area, began a volume at 17:19 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 5.3 hours before the alert went out and 120 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: 1272 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 804 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.9

Open this sounding in Storm Lab

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 9, 10:30 AM EDT, 2 hours 49 minutes earlier.

Area forecast discussion, Jun 9, 10:30 AM EDT, 2 hours 49 minutes before

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Hazardous weather outlook, Jun 9, 11:10 AM EDT, 2 hours 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1110 AM EDT TUE JUN 9 2009

PAZ004>006-010-011-101515-
WARREN-MCKEAN-POTTER-ELK-CAMERON-
1110 AM EDT TUE JUN 9 2009

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...WEDNESDAY THROUGH MONDAY.

SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE AGAIN THURSDAY. THERE
IS A CHANCE SOME COULD BECOME LOCALLY SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION SHOULD NOT BE NECESSARY.

PAZ012-017-018-024>026-033>035-101515-
NORTHERN CLINTON-CLEARFIELD-NORTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-
SOMERSET-BEDFORD-FULTON-
1110 AM EDT TUE JUN 9 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON.
ISOLATED STORMS MAY BECOME SEVERE AND PRODUCE DAMAGING WINDS OR
HAIL.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE AGAIN THURSDAY. THERE
IS A CHANCE SOME COULD BECOME LOCALLY SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE.

PAZ019-027-028-036-037-041-042-045-046-049>053-056>059-063>066-
101515-
SOUTHERN CENTRE-MIFFLIN-JUNIATA-FRANKLIN-TIOGA-NORTHERN LYCOMING-
SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR-
NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-
ADAMS-YORK-LANCASTER-
1110 AM EDT TUE JUN 9 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

A COLD FRONT WILL TRIGGER SHOWERS AND THUNDERSTORMS THIS
AFTERNOON. THERE IS A SLIGHT RISK THAT THE STORMS COULD BE
SEVERE...PRODUCING DAMAGING WINDS AND HAIL. THERE IS A LOW RISK OF
TORNADOES AS WELL...BUT THIS RISK IS MUCH LOWER THAN THAT OF WIND
DAMAGE AND LARGE HAIL.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE AGAIN THURSDAY. THERE
IS A CHANCE SOME COULD BECOME LOCALLY SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED.

DANGELO

In the hours before

Special weather statement, Jun 9, 11:47 AM EDT, 1 hour 32 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1147 AM EDT TUE JUN 9 2009

PAZ033-091630-
SOMERSET PA-
1147 AM EDT TUE JUN 9 2009

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN SOMERSET COUNTY...

AT 1146 AM EDT...A STRONG THUNDERSTORM WAS LOCATED NEAR JENNERS...
MOVING EAST AT 20 MPH.

WIND GUSTS TO 40 MPH AND PEA-SIZED HAIL ARE POSSIBLE WITH THIS STORM.

THIS STORM WILL BE NEAR ACOSTA AROUND NOON...STOYSTOWN AROUND 1210
PM...STOYSTOWN AROUND 1220 PM AND CENTRAL CITY AROUND 1230 PM.

THIS WILL IMPACT THE PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 100
AND 128.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 30 FROM THE
WESTMORELAND COUNTY LINE TO EAST OF INDIAN LAKE...ROUTE 219 FROM
SOMERSET TO THE JUNCTION OF ROUTE 30.

LAT...LON 4004 7925 4011 7924 4012 7919 4016 7917
      4022 7912 4022 7872 3995 7879

EXPERIMENTAL

FORECASTER: DANGELO

Special weather statement, Jun 9, 12:01 PM EDT, 1 hour 18 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1201 PM EDT TUE JUN 9 2009

PAZ036-056-057-063>065-091800-
ADAMS PA-CUMBERLAND PA-DAUPHIN PA-FRANKLIN PA-PERRY PA-YORK PA-
1201 PM EDT TUE JUN 9 2009

...STRONG THUNDERSTORMS WILL AFFECT CUMBERLAND...NORTHEASTERN
FRANKLIN...NORTHERN ADAMS...NORTHWESTERN YORK...PERRY AND WESTERN
DAUPHIN COUNTIES...

AT 1257 PM EDT...STRONG THUNDERSTORMS WERE ALONG A LINE FROM 15 MILES
NORTH OF CARLISLE TO 9 MILES WEST OF CARLISLE...SOUTHWARD TO
CHAMBERSBURG...MOVING EAST AT 20 MPH.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS.
IN ADDITION...TORRENTIAL RAIN WILL FALL...CAUSING PONDING OF WATER
ON ROADS.

THESE STORMS WILL BE NEAR BLOSERVILLE...AND FAYETTEVILLE AROUND 105
PM...SHERMANSDALE AROUND 110 PM...WALNUT BOTTOM AROUND 115
PM...DUNCANNON AROUND 120 PM...AMITY HALL...AND CARLISLE SPRINGS
AROUND 125 PM...AND MILLERSBURG AROUND 130 PM.

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 191 AND 242...I-81 BETWEEN
MILE MARKERS 13 AND 67...I-83 BETWEEN MILE MARKERS 39 AND 42.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...THE HARRISBURG
EXPRESSWAY...ROUTE 11...ROUTE 11/15...ROUTE 15...ROUTE 30...ROUTE
209...ROUTE 322/22...STATE ROAD 94.

LAT...LON 3989 7774 4018 7779 4020 7778 4046 7739
      4062 7688 3992 7687

EXPERIMENTAL

FORECASTER: MARTIN

Special weather statement, Jun 9, 12:32 PM EDT, 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1232 PM EDT TUE JUN 9 2009

PAZ033-091715-
SOMERSET PA-
1232 PM EDT TUE JUN 9 2009

...A CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT WESTERN SOMERSET
COUNTY...

AT 1227 PM EDT...STRONG THUNDERSTORMS WERE LOCATED NEAR
CONNELLSVILLE...MOVING EAST AT 20 MPH.

WIND GUSTS TO 35 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS
AS THEY MOVE EAST. IN ADDITION...TORRENTIAL RAIN WILL CAUSE
PONDING OF WATER ON ROADS.

STORMS WILL BE NEAR SEVEN SPRINGS AROUND 1255 PM AND SOMERSET AROUND
115 PM.

THUNDERSTORMS WILL IMPACT THE PENNSYLVANIA TURNPIKE BETWEEN MILE
MARKERS 100 AND 113...AND ROUTE 219.

LAT...LON 3996 7936 4001 7933 4008 7928 4010 7925
      4011 7924 4013 7904 3988 7903 3989 7941
      3991 7941

EXPERIMENTAL

FORECASTER: MARTIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 8:20 PM EDT	Special Weather Statement	CTP	Lebanon	40 min
Jun 9, 3:11 AM EDT	Special Weather Statement	CTP	Huntingdon, Juniata, Mifflin, Snyder	64 min
Jun 9, 4:40 AM EDT	Special Weather Statement	CTP	Columbia, Dauphin, Lebanon, Montour, Northumberland, Schuylkill	65 min
Jun 9, 5:09 AM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Dauphin, Lancaster, Lebanon, Schuylkill	66 min
Jun 9, 6:13 AM EDT	Severe Thunderstorm Warning	CTP	Lancaster	27 min
Jun 9, 11:47 AM EDT	Special Weather Statement	CTP	Somerset	43 min
Jun 9, 12:01 PM EDT	Special Weather Statement	CTP	Cumberland, Franklin, Perry	119 min
Jun 9, 12:32 PM EDT	Special Weather Statement	CTP	Somerset	43 min
Jun 9, 1:03 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Somerset	42 min
Jun 9, 1:42 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, York	63 min
Jun 9, 1:49 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Somerset	56 min
Jun 9, 1:54 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Dauphin, Lancaster, Lebanon, York	66 min
Jun 9, 2:00 PM EDT	Severe Thunderstorm Warning	CTP	Franklin, Fulton	60 min
Jun 9, 2:07 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	23 min
Jun 9, 2:16 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Fulton	44 min
Jun 9, 2:27 PM EDT	Areal Flood Advisory	CTP	Lancaster	3 hr
Jun 9, 2:31 PM EDT	Areal Flood Advisory	CTP	Cumberland	3 hr
Jun 9, 2:35 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	25 min
Jun 9, 2:41 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Franklin, Perry, York	64 min
Jun 9, 2:50 PM EDT	Tornado Warning	CTP	Lancaster	25 min
Jun 9, 2:57 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	63 min
Jun 9, 3:12 PM EDT	Severe Thunderstorm Warning	CTP	Franklin	33 min
Jun 9, 3:20 PM EDT	Areal Flood Advisory	CTP	Franklin	3 hr
Jun 9, 3:23 PM EDT	Special Weather Statement	CTP	Somerset	37 min
Jun 9, 3:23 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	37 min
Jun 9, 3:28 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	62 min
Jun 9, 3:34 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Juniata, Northumberland, Perry	41 min
Jun 9, 3:44 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Franklin, York	49 min
Jun 9, 3:55 PM EDT	Areal Flood Advisory	CTP	Adams, Franklin	3 hr
Jun 9, 4:11 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	49 min
Jun 9, 4:17 PM EDT	Special Weather Statement	CTP	Dauphin	28 min
Jun 9, 4:29 PM EDT	Special Weather Statement	CTP	Bedford	31 min
Jun 9, 4:30 PM EDT	Special Weather Statement	CTP	Bedford	30 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2009 Every severe thunderstorm warning in 2009

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.