Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 99, NWS State College, PA

June 24, 2010Adams County, Lancaster County, York County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 24, 2010, 2:43 PM EDT for Adams County, Lancaster County, York County, Pennsylvania. It was in force for 62 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 24, 2010, 2:43 PM EDT (18:43 UTC)
Expired: Jun 24, 2010, 3:45 PM EDT
In force: 62 min
Issued by: NWS State College, PA
Area: Storm-based polygon

Counties Adams County, PA, Lancaster County, PA, York County, PA

The radar

The Sterling radar (KLWX), 126 km from the middle of the area, began a volume at 18:42 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jun 24, 12:28 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.7 hours before the alert went out and 75 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: 126 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 1592 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 24, 1:39 PM EDT, 1 hour 4 minutes earlier.

Area forecast discussion, Jun 24, 1:39 PM EDT, 1 hour 4 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
139 PM EDT THU JUN 24 2010

.SYNOPSIS...
A COLD FRONT WILL SWEEP ACROSS THE AREA TODAY...FOLLOWED BY
CLEARING SKIES...SLIGHTLY COOLER AND MUCH LESS HUMID AIR FOR
TONIGHT THROUGH MUCH OF SATURDAY. HEAT AND HUMIDITY WILL INCREASE
ONCE AGAIN SUNDAY INTO MONDAY...ALONG WITH A CHANCE OF MAINLY
AFTERNOON SHOWERS AND THUNDERSTORMS.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
CONVECTION IS STARTING TO FIRE AHEAD OF THE APPROACHING COLD
FRONT.

MESO ANAL SHOWS A STEADY INCREASE IN CAPE OVER ABOUT THE SRN 1/2
OR SO OF THE FCST AREA...ALONG WITH RAPID EROSION OF ANY CIN THAT
WAS PRESENT. STRONG WINDS JUST OFF THE DECK WILL POSE THE BIGGEST
THREAT AS THE STORMS MOVE INTO INCREASINGLY UNSTABLE AIR.

MAIN THINGS WORKING AGAINST THE STORMS ARE MEAGER MID LEVEL LAPSE
RATES AND A LACK OF LOW LEVEL CONVERGENCE AS THE WESTERLY FLOW IS
CAUSING WEAK SFC RIDGING OVER CENTRAL AREAS AND LEE SIDE TROFFING
OVER MY SERN ZONES. THIS WUD SEEM TO SUGGEST THE HIGHEST THREAT
AREA TO EVOLVE WILL BE THE SRN AND SERN TIER COUNTIES AS THE DAY
WEARS ON.

A POTENT...WESTERLY 700-500 MB WIND MAX OF 45KT...AND 60 KTS
RESPECTIVELY WILL TEAM WITH MDTLY STRONG COLD ADVECTION WITHIN
THIS LAYER TO READILY MIX DOWN WIND GUSTS OF 45 MPH WITHIN THE
STRONGER TSRA/REFLECTIVITY CORES. SPC HAS MAINTAINED THEIR SLIGHT
RISK AREA FOR MUCH OF CENTRAL AND EASTERN PA.

MAX TEMPS TDY WILL RANGE FROM THE MID 70S TO NEAR 80 ACROSS THE
NRN MTNS...TO THE STEAMY LOWER-MID 90S IN THE LOWER SUSQ VALLEY.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY NIGHT/...
SKIES CLEAR OUT AND WINDS DIMINISH LATER TODAY AND TONIGHT AS HIGH
PRESSURE /1022 MB/ BUILDS EAST FROM THE MIDDLE AND UPPER
MISSISSIPPI RIVER VALLEY.

THOUGH TEMPS WILL BE A FEW DEG F ABOVE NORMAL /IN THE MID 70S
NORTH...TO MID 80S SE/...FRIDAY WILL FEATURE PLENTY OF SUNSHINE
AND MUCH LOWER HUMIDITY THAT WE/VE EXPERIENCED DURING THE PAST
FEW DAYS.

A QUITE COOL AND MAINLY CLEAR NIGHT IS ON TAP FOR FRIDAY NIGHT
WITH LOWS ABOUT 50F ACROSS THE NRN HIGH TERRAIN...AND MID 50S TO
LOWER 60S ELSEWHERE. WATER/AIR TEMP DIFF EXCEEDING 10C IN THE DEEPER
VALLEYS OF CENTRAL AND NORTHERN PENN SHOULD RESULT IN AREAS OF
1/2-1SM FOG BETWEEN 07-13Z SATURDAY.

&&

.LONG TERM /SATURDAY THROUGH THURSDAY/...
WARM...BUT LESS HUMID CONDITIONS WILL PREVAIL ACROSS THE REGION
SAT. ALTHOUGH MOST OF THE DAY SHOULD BE PARTLY SUNNY AND RAIN-
FREE...WEAK LOW PRESSURE AT THE SURFACE AND A MID/UPR SHORT WAVE
APPROACHING FROM THE UPPER MIDWEST WILL PUSH A FEW SHRA/ISOLATED
TSRA INTO THE NORTH AND WEST LATER IN THE DAY INTO SATURDAY NIGHT.

MORE HEAT AND HUMIDITY APPEARS IN STORE FOR ALL OF CENTRAL PENN
SUNDAY AND MONDAY. WITH A CHANCE OF MAINLY AFTERNOON SHOWERS AND
THUNDERSTORMS.

STILL LOOKING AT DRY WEATHER AFTER TUE...WITH NW FLOW. STILL THINK
MODELS OVERDOING THE PUSH OF COLD AIR AND THE UPPER LVL TROUGH
BEING TOO AMPLIFIED...BUT LEFT CHC OF SHOWERS IN FOR MONDAY NIGHT
AND TUE.

&&

.AVIATION /18Z THURSDAY THROUGH TUESDAY/...

COLD FRONT CROSSING THE AREA TODAY. BEST CHANCE OF THUNDERSTORMS
FROM EARLY AFTERNOON THROUGH ABOUT 5 PM WILL BE SOUTH OF I-80.
EXPECT GENERALLY VFR CONDITIONS...WITH BRIEF MVFR/IFR IN THE
SHOWERS AND THUNDERSTORMS.

BEHIND THE FRONT...SKIES WILL CLEAR TONIGHT WITH SOME AREAS OF
PATCHY FOG EXPECTED...ESPECIALLY WHERE ANY KIND OF APPRECIABLE
RAINS OCCUR. GUSTY NW WIND INITIALLY...WILL DIMINISH TO UNDER 10
MPH BY DARK.

FRIDAY LOOKS LIKE A NICE DAY...WITH PLENTIFUL SUNSHINE AND VFR
FLYING CONDITIONS.

OUTLOOK...
SAT...VFR.
SUN-MON...MAINLY VFR WITH MVFR POSS IN SCTD SHRA/TSRA.
TUE...VFR.

&&

.CTP WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

SYNOPSIS...LA CORTE
NEAR TERM...LA CORTE/LAMBERT
SHORT TERM...FITZGERALD/LAMBERT
LONG TERM...LAMBERT/MARTIN
AVIATION...LA CORTE

Hazardous weather outlook, Jun 24, 2:42 PM EDT, 1 minute before

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In the hours before

Special weather statement, Jun 24, 12:01 PM EDT, 2 hours 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1201 PM EDT THU JUN 24 2010

PAZ024-025-033-034-241630-
BEDFORD PA-BLAIR PA-CAMBRIA PA-SOMERSET PA-
1201 PM EDT THU JUN 24 2010

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHWESTERN BEDFORD...
SOMERSET...SOUTHERN BLAIR AND SOUTHERN CAMBRIA COUNTIES...

AT NOON EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
WESTMONT TO MCCHESNEYTOWN-LOYA TO 21 MILES SOUTHWEST OF
CONNELLSVILLE...MOVING EAST AT 55 MPH.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS. THESE STORMS
WILL BE NEAR NANTY-GLO AROUND 1210 PM...LILLY AROUND 1220 PM AND
OGLETOWN AROUND 1230 PM.

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 100 AND 121...I-99 BETWEEN
MILE MARKERS 17 AND 32.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...THE JOHNSTOWN
EXPRESSWAY...ROUTE 22...ROUTE 30...ROUTE 40...ROUTE 219...ROUTE
220...ROUTE 422...STATE ROAD 56.

LAT...LON 3972 7940 3974 7942 3978 7940 3980 7936
      3982 7937 3985 7942 3990 7941 4008 7928
      4011 7923 4012 7919 4037 7899 4051 7892
      4048 7822 4017 7858 3971 7924

FORECASTER: STEINBUGL

Special weather statement, Jun 24, 12:36 PM EDT, 2 hours 7 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1236 PM EDT THU JUN 24 2010

PAZ024>026-033-034-241700-
BEDFORD PA-BLAIR PA-CAMBRIA PA-HUNTINGDON PA-SOMERSET PA-
1236 PM EDT THU JUN 24 2010

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN BEDFORD...
NORTHERN SOMERSET...SOUTH CENTRAL CAMBRIA...SOUTHERN BLAIR AND
SOUTHERN HUNTINGDON COUNTIES...

AT 1232 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
PORTAGE TO 14 MILES EAST OF CONNELLSVILLE...MOVING EAST AT 45 MPH.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS. THESE STORMS
WILL BE NEAR MARTINSBURG AROUND 1250 PM AND BERLIN AROUND 100 PM.

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 103 AND 153...I-99 BETWEEN
MILE MARKERS 0 AND 23.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 30...ROUTE
219...ROUTE 220...ROUTE 522.

LAT...LON 3989 7941 4000 7934 4040 7865 4032 7783
      4016 7813 4014 7815 3983 7870

FORECASTER: STEINBUGL

Special weather statement, Jun 24, 1:07 PM EDT, 1 hour 36 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
107 PM EDT THU JUN 24 2010

PAZ026-028-034>036-052-056>059-063-241800-
BEDFORD PA-CUMBERLAND PA-DAUPHIN PA-FRANKLIN PA-FULTON PA-
HUNTINGDON PA-JUNIATA PA-LEBANON PA-NORTHUMBERLAND PA-PERRY PA-
SCHUYLKILL PA-
107 PM EDT THU JUN 24 2010

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT DAUPHIN...LEBANON...
NORTHEASTERN FULTON...NORTHERN BEDFORD...NORTHERN CUMBERLAND...
NORTHERN FRANKLIN...PERRY...SCHUYLKILL...SOUTHEASTERN
NORTHUMBERLAND...SOUTHERN HUNTINGDON AND SOUTHWESTERN JUNIATA
COUNTIES...

AT 104 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
KULPMONT TO 15 MILES NORTH OF CARLISLE TO WINDBER...MOVING EAST AT 45
MPH.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS. THESE STORMS
WILL BE NEAR GORDON AROUND 115 PM...ST. CLAIR AROUND 130 PM...
ORWIGSBURG AROUND 145 PM AND WORMLEYSBURG AROUND 200 PM.

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 171 AND 232...I-78 BETWEEN
MILE MARKERS 0 AND 8...I-81 BETWEEN MILE MARKERS 40 AND 121...I-83
BETWEEN MILE MARKERS 41 AND 50...I-99 BETWEEN MILE MARKERS 2 AND 9.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...THE HARRISBURG
EXPRESSWAY...ROUTE 11...ROUTE 11/15...ROUTE 15...ROUTE 22...ROUTE
209...ROUTE 220...ROUTE 322...ROUTE 322/22...ROUTE 422...ROUTE 522...
STATE ROAD 61...STATE ROAD 309...STATE ROAD 501.

LAT...LON 4064 7599 4058 7602 4058 7607 4053 7618
      4049 7642 4036 7624 4034 7629 4003 7791
      4009 7872 4014 7870 4043 7725 4078 7645
      4073 7581

FORECASTER: STEINBUGL

Special weather statement, Jun 24, 1:09 PM EDT, 1 hour 34 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
109 PM EDT THU JUN 24 2010

PAZ026-033>035-241800-
BEDFORD PA-FULTON PA-HUNTINGDON PA-SOMERSET PA-
109 PM EDT THU JUN 24 2010

...STRONG THUNDERSTORMS WILL AFFECT BEDFORD...NORTHERN FULTON...
SOUTHEASTERN SOMERSET AND SOUTHERN HUNTINGDON COUNTIES...

AN AREA OF STRONG THUNDERSTORMS COVERED PORTIONS OF BEDFORD...
FULTON...HUNTINGDON AND SOMERSET COUNTIES AT 104 PM EDT. THE STRONG
THUNDERSTORMS WERE GENERALLY MOVING EAST AT 35 MPH.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STRONG THUNDERSTORMS.

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 118 AND 183...I-70 BETWEEN
MILE MARKERS 147 AND 160...I-99 BETWEEN MILE MARKERS 0 AND 10.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 30...ROUTE
40...ROUTE 219...ROUTE 220...ROUTE 522.

LAT...LON 3972 7934 4021 7863 4012 7783 3972 7842

FORECASTER: STEINBUGL

Local storm report, Jun 24, 2:12 PM EDT, 31 minutes before

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Local storm report, Jun 24, 2:28 PM EDT, 15 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
Jun 23, 9:42 PM EDT	Special Weather Statement	CTP	Warren	63 min
Jun 23, 10:24 PM EDT	Special Weather Statement	CTP	McKean	51 min
Jun 23, 11:04 PM EDT	Special Weather Statement	CTP	Forest	41 min
Jun 23, 11:23 PM EDT	Special Weather Statement	CTP	Warren	52 min
Jun 23, 11:53 PM EDT	Severe Thunderstorm Warning	CTP	McKean, Warren	52 min
Jun 24, 12:28 AM EDT	Special Weather Statement	CTP	Cameron, Elk, McKean	62 min
Jun 24, 12:50 AM EDT	Areal Flood Advisory	CTP	McKean, Warren	4 hr
Jun 24, 1:03 AM EDT	Special Weather Statement	CTP	McKean	42 min
Jun 24, 1:07 AM EDT	Flash Flood Watch	CTP	Cameron, Elk, McKean, Potter, Tioga, Warren	9 hr
Jun 24, 1:27 AM EDT	Special Weather Statement	CTP	Cameron, Potter, Tioga	78 min
Jun 24, 1:46 AM EDT	Special Weather Statement	CTP	Potter	59 min
Jun 24, 2:04 AM EDT	Special Weather Statement	CTP	Warren	56 min
Jun 24, 2:27 AM EDT	Special Weather Statement	CTP	Tioga	33 min
Jun 24, 2:38 AM EDT	Special Weather Statement	CTP	Potter, Tioga	22 min
Jun 24, 3:04 AM EDT	Special Weather Statement	CTP	Sullivan, Tioga	41 min
Jun 24, 4:07 AM EDT	Special Weather Statement	CTP	Sullivan	23 min
Jun 24, 9:11 AM EDT	Special Weather Statement	CTP	Cameron, Elk, McKean	34 min
Jun 24, 9:45 AM EDT	Special Weather Statement	CTP	Cameron, Clinton, Potter, Tioga	45 min
Jun 24, 10:10 AM EDT	Special Weather Statement	CTP	Clearfield	50 min
Jun 24, 10:59 AM EDT	Special Weather Statement	CTP	Tioga	46 min
Jun 24, 12:01 PM EDT	Special Weather Statement	CTP	Somerset	29 min
Jun 24, 12:20 PM EDT	Severe Thunderstorm Warning	CTP	Somerset	42 min
Jun 24, 12:36 PM EDT	Special Weather Statement	CTP	Bedford, Somerset	24 min
Jun 24, 1:07 PM EDT	Special Weather Statement	CTP	Cumberland, Dauphin, Lebanon, Perry, Schuylkill	53 min
Jun 24, 1:09 PM EDT	Special Weather Statement	CTP	Bedford	51 min
Jun 24, 1:21 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Cumberland, Franklin, Fulton, Huntingdon, Perry	39 min
Jun 24, 1:29 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Dauphin, Franklin, Lancaster, Lebanon, Perry and 1 more	61 min
Jun 24, 1:55 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Franklin, York	50 min
Jun 24, 2:02 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster, Lebanon, York	58 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2010 Every severe thunderstorm warning in 2010

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.