Alert archive / Pennsylvania / Winter Storm Watches in 2012

Winter Storm Watch 2, NWS State College, PA

April 21, 201216 counties in Pennsylvania

NWS State College, PA issued this winter storm watch at Apr 21, 2012, 4:17 PM EDT for 16 counties in Pennsylvania. It took effect at Apr 22, 2012, 10:00 PM EDT. It was in force for .

The area

The counties it named.

The facts

Issued
Apr 21, 2012, 4:17 PM EDT (20:17 UTC)
In effect from
Apr 22, 2012, 10:00 PM EDT
Expired
Apr 22, 2012, 4:20 PM EDT
In force
Issued by
NWS State College, PA

Counties Bedford County, PA, Blair County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Elk County, PA, Fulton County, PA, Huntingdon County, PA, Lycoming County, PA, McKean County, PA, Potter County, PA, Somerset County, PA, Tioga County, PA, Warren County, PA

The radar

The State College radar (KCCX), 19 km from the middle of the area, began a volume at 20:19 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

Pittsburgh, PA (KPIT), launched 12:00Z, 8.3 hours before the alert went out and 171 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, Pittsburgh, PA at 12:00Z on 2012-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Pittsburgh, PA at 12:00Z on 2012-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
464 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
141 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

617 
WWUS41 KCTP 212017
WSWCTP

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE STATE COLLEGE PA
417 PM EDT SAT APR 21 2012

...A LATE SEASON...HEAVY AND DESTRUCTIVE SNOWSTORM IS POSSIBLE
SUNDAY NIGHT THROUGH TUESDAY MORNING...

.SURFACE LOW PRESSURE WILL FORM ALONG THE SOUTH CAROLINA COAST
EARLY SUNDAY AND MOVE NORTH ALONG THE EASTERN SEABOARD REACHING
THE DELMARVA PENINSULA EARLY SUNDAY NIGHT. A DEEPENING...AND SLOW
MOVING UPPER LOW WILL MOVE NORTHEAST FROM THE OHIO RIVER VALLEY
SUNDAY AFTERNOON AND CROSS CENTRAL OR EASTERN PENNSYLVANIA MONDAY. 
THE FAVORABLE TRACK OF BOTH OF THESE FEATURES WILL LEAD THE THE
POTENTIAL OF A HEAVY...AND DESTRUCTIVE LATE SEASON SNOWFALL ACROSS
THE NORTHERN AND WESTERN MOUNTAINS OF PENNSYLVANIA. THERE IS A
DISTINCT THREAT FOR WIDESPREAD DOWNED TREES AND POWER OUTAGES
FROM THE HEAVY SNOW AND POTENTIALLY STRONG NORTHERLY WINDS FROM 
THIS STORM. 

PAZ004>006-010-011-017-024-033-037-221000-
/O.NEW.KCTP.WS.A.0002.120423T0200Z-120424T1600Z/
WARREN-MCKEAN-POTTER-ELK-CAMERON-CLEARFIELD-CAMBRIA-SOMERSET-
TIOGA-
INCLUDING THE CITIES OF...WARREN...BRADFORD...COUDERSPORT...
ST. MARYS...RIDGWAY...EMPORIUM...DUBOIS...CLEARFIELD...
JOHNSTOWN...SOMERSET...MANSFIELD...WELLSBORO
417 PM EDT SAT APR 21 2012

...WINTER STORM WATCH IN EFFECT FROM SUNDAY EVENING THROUGH
TUESDAY MORNING...

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A WINTER
STORM WATCH...WHICH IS IN EFFECT FROM SUNDAY EVENING THROUGH
TUESDAY MORNING. 

* LOCATIONS...NORTHERN AND WESTERN MOUNTAINS OF
  PENNSYLVANIA...INCLUDING THE LAUREL HIGHLANDS.

* HAZARD TYPES...HEAVY SNOW...ACCOMPANIED BY INCREASING NORTHERLY
  WINDS LATE SUNDAY NIGHT AND MONDAY. 

* ACCUMULATIONS...IN EXCESS OF 6 INCHES...WITH UP TO ONE FOOT
  POSSIBLE ACROSS SOME OF THE HIGHER TERRAIN.

* TIMING...SUNDAY NIGHT THROUGH TUESDAY MORNING. 

* IMPACTS...EXTREMELY HAZARDOUS TRAVEL FROM PERIODS OF HEAVY SNOW
  AND POOR VISIBILITY. THERE IS THE POTENTIAL FOR NUMEROUS DOWNED
  TREES CAUSING POWER OUTAGES...BEGINNING LATER SUNDAY NIGHT.

* WINDS...NORTH TO NORTHEAST 10 TO 20 MPH WITH GUSTS UP TO 25 MPH
  SUNDAY NIGHT...INCREASING TO 15 TO 25 MPH WITH GUSTS TO 40 MPH
  MONDAY.

* TEMPERATURES...30 TO 35 DEGREES.

* VISIBILITIES...BELOW ONE HALF OF A MILE AT TIMES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. IN
ADDITIONAL...SINCE MANY TREES ALREADY CONTAIN NEAR FULL-FOLIAGE...
THERE IS THE POTENTIAL FOR MANY DOWNED TREES AND NUMEROUS POWER
OUTAGES FROM THE COMBINED EFFECT OF THE HEAVY WET SNOW AND WIND. 
STAY TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE SOURCE OF
WEATHER INFORMATION FOR THE LATEST UPDATES. ADDITIONAL DETAILS CAN
ALSO BE FOUND AT...WEATHER.GOV/STATECOLLEGE.

&&

$$

LAMBERT/MARTIN
4 follow-up statements
092 
WWUS41 KCTP 220235
WSWCTP

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1035 PM EDT SAT APR 21 2012

...A LATE SEASON...HEAVY AND DESTRUCTIVE SNOWSTORM IS POSSIBLE
SUNDAY NIGHT THROUGH TUESDAY MORNING...

.SURFACE LOW PRESSURE WILL FORM ALONG THE SOUTH CAROLINA COAST
EARLY SUNDAY AND MOVE NORTH ALONG THE EASTERN SEABOARD REACHING
THE DELMARVA PENINSULA EARLY SUNDAY NIGHT. A DEEPENING...AND SLOW
MOVING UPPER LOW WILL MOVE NORTHEAST FROM THE OHIO RIVER VALLEY
SUNDAY AFTERNOON AND CROSS CENTRAL OR EASTERN PENNSYLVANIA
MONDAY. THE FAVORABLE TRACK OF BOTH OF THESE FEATURES WILL LEAD
THE THE POTENTIAL OF A HEAVY...AND DESTRUCTIVE LATE SEASON
SNOWFALL ACROSS THE NORTHERN AND WESTERN MOUNTAINS OF
PENNSYLVANIA. THERE IS A DISTINCT THREAT FOR WIDESPREAD DOWNED
TREES AND POWER OUTAGES FROM THE HEAVY SNOW AND POTENTIALLY
STRONG NORTHERLY WINDS FROM THIS STORM.

PAZ004>006-010-011-017-024-033-037-221200-
/O.CON.KCTP.WS.A.0002.120423T0200Z-120424T1600Z/
WARREN-MCKEAN-POTTER-ELK-CAMERON-CLEARFIELD-CAMBRIA-SOMERSET-
TIOGA-
INCLUDING THE CITIES OF...WARREN...BRADFORD...COUDERSPORT...
ST. MARYS...RIDGWAY...EMPORIUM...DUBOIS...CLEARFIELD...
JOHNSTOWN...SOMERSET...MANSFIELD...WELLSBORO
1035 PM EDT SAT APR 21 2012

...A WINTER STORM WATCH REMAINS IN EFFECT FROM SUNDAY EVENING
THROUGH TUESDAY MORNING...

* LOCATIONS...NORTHERN AND WESTERN MOUNTAINS OF PENNSYLVANIA... 
  INCLUDING THE LAUREL HIGHLANDS. 

* HAZARD TYPES...HEAVY SNOW...ACCOMPANIED BY INCREASING 
  NORTHERLY WINDS LATE SUNDAY NIGHT AND MONDAY. 

* ACCUMULATIONS...8 INCHES OR MORE ACROSS MUCH OF THE WATCH
  AREA...WITH OVER ONE FOOT POSSIBLE ACROSS SOME OF THE HIGHER
  TERRAIN.

* TIMING...SUNDAY NIGHT THROUGH TUESDAY MORNING.

* IMPACTS...EXTREMELY HAZARDOUS TRAVEL FROM PERIODS OF HEAVY 
  SNOW AND POOR VISIBILITY. THERE IS THE POTENTIAL FOR NUMEROUS 
  DOWNED TREES CAUSING POWER OUTAGES...BEGINNING LATER SUNDAY 
  NIGHT. 

* WINDS...NORTH TO NORTHEAST 10 TO 20 MPH WITH GUSTS UP TO 25 
  MPH SUNDAY NIGHT...INCREASING TO 15 TO 25 MPH WITH GUSTS TO 40 
  MPH MONDAY. 

* TEMPERATURES...30 TO 35 DEGREES.

* VISIBILITIES...BELOW ONE HALF OF A MILE AT TIMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. IN
ADDITIONAL...SINCE MANY TREES ALREADY CONTAIN NEAR FULL-FOLIAGE...
THERE IS THE POTENTIAL FOR MANY DOWNED TREES AND NUMEROUS POWER
OUTAGES FROM THE COMBINED EFFECT OF THE HEAVY WET SNOW AND WIND.
STAY TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE SOURCE OF
WEATHER INFORMATION FOR THE LATEST UPDATES. ADDITIONAL DETAILS
CAN ALSO BE FOUND AT...WEATHER.GOV/STATECOLLEGE.

&&

$$

LAMBERT/GARTNER
350 
WWUS41 KCTP 220737
WSWCTP

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE STATE COLLEGE PA
337 AM EDT SUN APR 22 2012

...A DESTRUCTIVE LATE SEASON SNOWSTORM IS POSSIBLE SUNDAY NIGHT
THROUGH TUESDAY MORNING...

.SURFACE LOW PRESSURE WILL FORM ALONG THE SOUTH CAROLINA COAST
EARLY THIS MORNING AND MOVE NORTH ALONG THE EASTERN SEABOARD
REACHING THE DELMARVA PENINSULA TONIGHT. A DEEPENING...AND SLOW 
MOVING UPPER LOW WILL MOVE NORTHEAST FROM THE OHIO RIVER VALLEY
THIS AFTERNOON AND CROSS CENTRAL OR EASTERN PENNSYLVANIA MONDAY.
THERE IS INCREASING CONFIDENCE FOR A VERY HEAVY AND WET LATE
SEASON SNOWFALL ACROSS THE NORTHERN AND WESTERN MOUNTAINS OF
PENNSYLVANIA...AND PARTS OF THE CENTRAL MOUNTAIN REGION AS WELL. 
GIVEN NEARLY FULL LEAF OUT ACROSS THE REGION...HEAVY WET SNOW
ACCUMULATIONS WILL PRODUCE WIDESPREAD TREE DAMAGE AND POWER
OUTAGES FROM FALLING TREES AND LIMBS COMBINED WITH LOCALLY STRONG
NORTHERLY WINDS FROM THIS STORM. PERSONS IN THE WATCH AREA SHOULD
PREPARE FOR EXTENDED POWER OUTAGES AS A RESULT OF THIS STORM.

PAZ012-018-019-025-026-034-035-041-045-222000-
/O.EXB.KCTP.WS.A.0002.120423T0400Z-120424T1600Z/
NORTHERN CLINTON-NORTHERN CENTRE-SOUTHERN CENTRE-BLAIR-HUNTINGDON-
BEDFORD-FULTON-NORTHERN LYCOMING-SOUTHERN CLINTON-
INCLUDING THE CITIES OF...RENOVO...PHILIPSBURG...STATE COLLEGE...
ALTOONA...HUNTINGDON...MOUNT UNION...BEDFORD...MCCONNELLSBURG...
LOCK HAVEN
337 AM EDT SUN APR 22 2012

...WINTER STORM WATCH IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY
MORNING...

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A WINTER
STORM WATCH...WHICH IS IN EFFECT FROM LATE TONIGHT THROUGH
TUESDAY MORNING. 

* LOCATIONS...PORTIONS OF THE CENTRAL AND SOUTH CENTRAL MOUNTAINS

* HAZARD TYPES...HEAVY SNOW...ACCOMPANIED BY INCREASING 
  NORTHERLY WINDS LATE SUNDAY NIGHT AND MONDAY.

* ACCUMULATIONS...4 TO 8 INCHES

* TIMING...SUNDAY NIGHT THROUGH TUESDAY MORNING.

* IMPACTS...EXTREMELY HAZARDOUS TRAVEL FROM PERIODS OF HEAVY SNOW
  AND POOR VISIBILITY. THERE IS THE POTENTIAL FOR WIDESPREAD TREE
  DAMAGE DUE TO HEAVY WET SNOW ACCUMULATIONS...LEADING TO DOWNED
  UTILITY LINES AND POTENTIALLY LENGTHY POWER OUTAGES BEGINNING LATER
  SUNDAY NIGHT.

* WINDS...NORTH TO NORTHEAST 10 TO 20 MPH WITH GUSTS UP TO 25 
  MPH SUNDAY NIGHT...INCREASING TO 15 TO 25 MPH WITH GUSTS TO 40 
  MPH MONDAY. 

* TEMPERATURES...30 TO 35 DEGREES.

* VISIBILITIES...BELOW ONE HALF OF A MILE AT TIMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. STAY
TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE SOURCE OF WEATHER
INFORMATION FOR THE LATEST UPDATES. ADDITIONAL DETAILS CAN ALSO
BE FOUND AT...WEATHER.GOV/STATECOLLEGE.

&&

$$

PAZ004>006-010-011-017-024-033-037-222000-
/O.CON.KCTP.WS.A.0002.120423T0200Z-120424T1600Z/
WARREN-MCKEAN-POTTER-ELK-CAMERON-CLEARFIELD-CAMBRIA-SOMERSET-
TIOGA-
INCLUDING THE CITIES OF...WARREN...BRADFORD...COUDERSPORT...
ST. MARYS...RIDGWAY...EMPORIUM...DUBOIS...CLEARFIELD...
JOHNSTOWN...SOMERSET...MANSFIELD...WELLSBORO
337 AM EDT SUN APR 22 2012

...WINTER STORM WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH
TUESDAY MORNING...

* LOCATIONS...NORTHERN AND WESTERN MOUNTAINS OF PENNSYLVANIA... 
  INCLUDING THE LAUREL HIGHLANDS. 

* HAZARD TYPES...HEAVY SNOW...ACCOMPANIED BY INCREASING 
  NORTHERLY WINDS LATE SUNDAY NIGHT AND MONDAY. 

* ACCUMULATIONS...8 INCHES OR MORE ACROSS MUCH OF THE WATCH 
  AREA...WITH OVER ONE FOOT POSSIBLE ACROSS SOME OF THE HIGHER 
  TERRAIN. 

* TIMING...SUNDAY NIGHT THROUGH TUESDAY MORNING.

* IMPACTS...EXTREMELY HAZARDOUS TRAVEL FROM PERIODS OF HEAVY 
  SNOW AND POOR VISIBILITY. THERE IS THE POTENTIAL FOR NUMEROUS 
  DOWNED TREES CAUSING POWER OUTAGES...BEGINNING LATER SUNDAY 
  NIGHT. 

* WINDS...NORTH TO NORTHEAST 10 TO 20 MPH WITH GUSTS UP TO 25 
  MPH SUNDAY NIGHT...INCREASING TO 15 TO 25 MPH WITH GUSTS TO 40 
  MPH MONDAY. 

* TEMPERATURES...30 TO 35 DEGREES.

* VISIBILITIES...BELOW ONE HALF OF A MILE AT TIMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. IN
ADDITIONAL...SINCE MANY TREES ALREADY CONTAIN NEAR FULL-FOLIAGE...
THERE IS THE POTENTIAL FOR MANY DOWNED TREES AND NUMEROUS POWER
OUTAGES FROM THE COMBINED EFFECT OF THE HEAVY WET SNOW AND WIND.
STAY TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE SOURCE OF
WEATHER INFORMATION FOR THE LATEST UPDATES. ADDITIONAL DETAILS
CAN ALSO BE FOUND AT...WEATHER.GOV/STATECOLLEGE.

&&

$$

DEVOIR
540 
WWUS41 KCTP 221539
WSWCTP

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1139 AM EDT SUN APR 22 2012

...A DESTRUCTIVE LATE SEASON SNOWSTORM IS BECOMING MORE LIKELY FOR
TONIGHT THROUGH TUESDAY MORNING...

.SURFACE LOW PRESSURE WILL MOVE NORTH ALONG THE ATLANTIC SEABOARD
REACHING SOUTHEASTERN PENNSYLVANIA LATE TONIGHT. THERE IS
INCREASING CONFIDENCE FOR A VERY HEAVY AND WET LATE SEASON
SNOWFALL ACROSS THE NORTHERN AND WESTERN MOUNTAINS OF
PENNSYLVANIA...AND PARTS OF THE CENTRAL MOUNTAIN REGION AS WELL.
GUSTY NORTHWEST WINDS WILL ALSO OCCUR DURING THE HEIGHT OF THE
STORM. GIVEN THE ACCELERATED GREEN UP AND LEAF OUT ACROSS THE
REGION...HEAVY WET SNOW ACCUMULATIONS WILL PRODUCE WIDESPREAD TREE
DAMAGE WHICH WILL LEAD TO POWER OUTAGES DUE TO FALLING TREES AND
LIMBS. PERSONS IN THE WATCH AREA SHOULD PREPARE FOR EXTENDED POWER
OUTAGES AS A RESULT OF THIS STORM.

PAZ004>006-010-011-017-024-033-037-222345-
/O.CON.KCTP.WS.A.0002.120423T0200Z-120424T1600Z/
WARREN-MCKEAN-POTTER-ELK-CAMERON-CLEARFIELD-CAMBRIA-SOMERSET-
TIOGA-
INCLUDING THE CITIES OF...WARREN...BRADFORD...COUDERSPORT...
ST. MARYS...RIDGWAY...EMPORIUM...DUBOIS...CLEARFIELD...
JOHNSTOWN...SOMERSET...MANSFIELD...WELLSBORO
1139 AM EDT SUN APR 22 2012

...WINTER STORM WATCH REMAINS IN EFFECT FROM 10 PM EDT THIS
EVENING THROUGH TUESDAY MORNING...

* LOCATIONS...NORTHERN AND WESTERN MOUNTAINS OF PENNSYLVANIA... 
  INCLUDING THE LAUREL HIGHLANDS. 

* HAZARD TYPES...HEAVY SNOW...ACCOMPANIED BY INCREASING NORTHWEST
  WINDS LATE TONIGHT AND MONDAY.

* ACCUMULATIONS...8 INCHES OR MORE ACROSS MUCH OF THE WATCH 
  AREA...WITH OVER ONE FOOT POSSIBLE ACROSS SOME OF THE HIGHER 
  TERRAIN. 

* TIMING...SUNDAY NIGHT THROUGH TUESDAY MORNING.

* IMPACTS...EXTREMELY HAZARDOUS TRAVEL FROM PERIODS OF HEAVY SNOW
  AND POOR VISIBILITY. THERE IS GREAT POTENTIAL FOR WIDESPREAD
  TREE DAMAGE. THE FALLING TREES AND LIMBS WOULD THEN CAUSE
  WIDESPREAD POWER OUTAGES...ESPECIALLY ACROSS THE HIGHER
  ELEVATIONS. ANY POWER OUTAGES THAT OCCUR IN RURAL LOCATIONS
  COULD BE LENGTHY.

* WINDS...NORTH TO NORTHEAST 10 TO 20 MPH WITH GUSTS UP TO 25 
  MPH SUNDAY NIGHT...INCREASING TO 15 TO 25 MPH WITH GUSTS TO 40 
  MPH MONDAY. 

* TEMPERATURES...30 TO 35 DEGREES.

* VISIBILITIES...BELOW ONE HALF OF A MILE AT TIMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. IN
ADDITIONAL...SINCE MANY TREES ALREADY CONTAIN NEAR FULL-FOLIAGE...
THERE IS THE POTENTIAL FOR MANY DOWNED TREES AND NUMEROUS POWER
OUTAGES FROM THE COMBINED EFFECT OF THE HEAVY WET SNOW AND WIND.
STAY TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE SOURCE OF
WEATHER INFORMATION FOR THE LATEST UPDATES. ADDITIONAL DETAILS
CAN ALSO BE FOUND AT...WEATHER.GOV/STATECOLLEGE.

&&

$$

PAZ012-018-019-025-026-034-035-041-045-222345-
/O.CON.KCTP.WS.A.0002.120423T0400Z-120424T1600Z/
NORTHERN CLINTON-NORTHERN CENTRE-SOUTHERN CENTRE-BLAIR-HUNTINGDON-
BEDFORD-FULTON-NORTHERN LYCOMING-SOUTHERN CLINTON-
INCLUDING THE CITIES OF...RENOVO...PHILIPSBURG...STATE COLLEGE...
ALTOONA...HUNTINGDON...MOUNT UNION...BEDFORD...MCCONNELLSBURG...
LOCK HAVEN
1139 AM EDT SUN APR 22 2012

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
TUESDAY MORNING...

* LOCATIONS...PORTIONS OF THE CENTRAL AND SOUTH CENTRAL MOUNTAINS.

* HAZARD TYPES...HEAVY SNOW...ACCOMPANIED BY INCREASING NORTHWEST
  WINDS LATE SUNDAY NIGHT AND MONDAY.

* ACCUMULATIONS...4 TO 8 INCHES

* TIMING...SUNDAY NIGHT THROUGH TUESDAY MORNING.

* IMPACTS...HAZARDOUS TRAVEL FROM PERIODS OF HEAVY SNOW AND POOR
  VISIBILITY. THERE IS THE POTENTIAL FOR TREE DAMAGE DUE TO HEAVY
  WET SNOW ACCUMULATIONS...ESPECIALLY ON THE RIDGE TOPS. FALLING
  TREES AND LIMBS WOULD THEN LEAD TO DOWNED UTILITY LINES AND
  POWER OUTAGES. ANY POWER OUTAGES THAT OCCUR IN RURAL AREAS COULD
  BE LENGTHY. 

* WINDS...NORTH TO NORTHEAST 10 TO 20 MPH WITH GUSTS UP TO 25 
  MPH SUNDAY NIGHT...INCREASING TO 15 TO 25 MPH WITH GUSTS TO 40 
  MPH MONDAY. 

* TEMPERATURES...30 TO 35 DEGREES.

* VISIBILITIES...BELOW ONE HALF OF A MILE AT TIMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL. STAY
TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE SOURCE OF WEATHER
INFORMATION FOR THE LATEST UPDATES. ADDITIONAL DETAILS CAN ALSO
BE FOUND AT...WEATHER.GOV/STATECOLLEGE.

&&

$$

DANGELO
768 
WWUS41 KCTP 222020
WSWCTP

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE STATE COLLEGE PA
420 PM EDT SUN APR 22 2012

...A DESTRUCTIVE LATE SEASON SNOWSTORM WILL OCCUR ACROSS THE
NORTHERN AND WESTERN MOUNTAINS OF PENNSYLVANIA...INCLUDING THE
LAUREL HIGHLANDS TONIGHT THROUGH TUESDAY MORNING...

.SURFACE LOW PRESSURE ORGANIZING ALONG THE SOUTHEAST U.S. COAST
WILL MOVE NORTH ALONG THE ATLANTIC SEABOARD REACHING NEW JERSEY
AROUND DAYBREAK MONDAY. THERE IS HIGH CONFIDENCE FOR A VERY 
HEAVY...WET...AND DESTRUCTIVE LATE SEASON SNOWFALL ACROSS THE
NORTHERN AND WESTERN MOUNTAINS OF PENNSYLVANIA...AND PARTS OF THE
CENTRAL MOUNTAIN REGION AS WELL. GUSTY NORTH TO NORTHWEST WINDS
WILL ALSO OCCUR DURING THE HEIGHT OF THE STORM. GIVEN THE
ACCELERATED GREEN UP AND LEAF OUT ACROSS THE REGION...THE HEAVY
WET SNOW ACCUMULATIONS WILL PRODUCE WIDESPREAD TREE DAMAGE WHICH
WILL LEAD TO POWER OUTAGES DUE TREES AND LIMBS FALLING ONTO
UTILITY LINES. PERSONS...ESPECIALLY THOSE IN THE WINTER STORM
WARNING AREA...SHOULD PREPARE FOR EXTENDED POWER OUTAGES AS A
RESULT OF THIS STORM.

PAZ004>006-010-011-017-024-033-037-231000-
/O.UPG.KCTP.WS.A.0002.120423T0200Z-120424T1600Z/
/O.NEW.KCTP.WS.W.0003.120423T0200Z-120424T1600Z/
WARREN-MCKEAN-POTTER-ELK-CAMERON-CLEARFIELD-CAMBRIA-SOMERSET-
TIOGA-
INCLUDING THE CITIES OF...WARREN...BRADFORD...COUDERSPORT...
ST. MARYS...RIDGWAY...EMPORIUM...DUBOIS...CLEARFIELD...
JOHNSTOWN...SOMERSET...MANSFIELD...WELLSBORO
420 PM EDT SUN APR 22 2012

...A WINTER STORM WARNING IN EFFECT FROM 10 PM THIS EVENING TO
NOON EDT TUESDAY...

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A WINTER
STORM WARNING FOR HEAVY WET SNOW...WHICH IS IN EFFECT FROM 10 PM
THIS EVENING TO NOON EDT TUESDAY. THE WINTER STORM WATCH IS NO
LONGER IN EFFECT.

* LOCATIONS...NORTHERN AND WESTERN MOUNTAINS OF PENNSYLVANIA
  INCLUDING THE LAUREL HIGHLANDS.

* HAZARD TYPES...HEAVY SNOW...ACCOMPANIED BY INCREASING NORTH TO
  NORTHWEST WINDS LATE TONIGHT AND MONDAY.

* ACCUMULATIONS...8 TO 12 INCHES...WITH LOCALIZED AMOUNTS BETWEEN
  14 AND 18 INCHES ACROSS THE HIGHEST TERRAIN OF NORTHWEST
  PENNSYLVANIA AND PORTIONS OF THE LAUREL HIGHLANDS.

* TIMING...LATE TONIGHT THROUGH TUESDAY MORNING. THE HEAVIEST
  SNOWFALL RATES OF OVER AN INCH PER HOUR AT TIMES WILL OCCUR LATE
  TONIGHT THROUGH THE MIDDAY HOURS MONDAY. 

* IMPACTS...EXTREMELY HAZARDOUS TRAVEL FROM PERIODS OF HEAVY SNOW
  AND POOR VISIBILITY. THERE IS GREAT POTENTIAL FOR WIDESPREAD
  TREE DAMAGE. THE FALLING TREES AND LIMBS WILL KNOCK DOWN UTILITY
  LINES...LIKELY CAUSING WIDESPREAD POWER OUTAGES...ESPECIALLY
  ACROSS THE HIGHER ELEVATIONS. ANY POWER OUTAGES THAT OCCUR IN
  RURAL LOCATIONS COULD BE LENGTHY.

* WINDS...NORTH TO NORTHEAST 15 TO 20 MPH WITH GUSTS UP TO 30 MPH
  LATE TONIGHT...BECOMING NORTH NORTHWEST AND INCREASING TO 15 TO
  25 MPH WITH GUSTS TO 40 MPH MONDAY.

* TEMPERATURES...30 TO 35 DEGREES.

* VISIBILITIES...BETWEEN ONE QUARTER AND ONE HALF OF A MILE AT TIMES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...
A WINTER STORM WARNING FOR HEAVY SNOW MEANS A SIGNIFICANT AMOUNT
OF SNOW IS FORECAST THAT WILL MAKE TRAVEL DANGEROUS. IN
ADDITION...SINCE SOME TREES ALREADY CONTAIN NEAR FULL-FOLIAGE...
THERE IS THE POTENTIAL FOR DOWNED TREES AND NUMEROUS POWER OUTAGES
FROM THE COMBINED EFFECT OF THE HEAVY WET SNOW AND WIND. IF YOU
MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...FOOD...BLANKET AND A
CELLULAR PHONE IN YOUR VEHICLE IN CASE OF AN EMERGENCY. STAY TUNED
TO NOAA WEATHER RADIO OR YOUR FAVORITE SOURCE OF WEATHER
INFORMATION FOR THE LATEST UPDATES. ADDITIONAL DETAILS CAN ALSO BE
FOUND AT...WEATHER.GOV/STATECOLLEGE.

&&

$$

PAZ012-018-041-231000-
/O.UPG.KCTP.WS.A.0002.120423T0400Z-120424T1600Z/
/O.NEW.KCTP.WS.W.0003.120423T0200Z-120424T1600Z/
NORTHERN CLINTON-NORTHERN CENTRE-NORTHERN LYCOMING-
INCLUDING THE CITIES OF...RENOVO...PHILIPSBURG
420 PM EDT SUN APR 22 2012

...WINTER STORM WARNING IN EFFECT FROM 10 PM THIS EVENING TO NOON
EDT TUESDAY...

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A WINTER
STORM WARNING FOR HEAVY WET SNOW...WHICH IS IN EFFECT FROM 10 PM
THIS EVENING TO NOON EDT TUESDAY. THE WINTER STORM WATCH IS NO
LONGER IN EFFECT.

* LOCATIONS...CENTRAL AND NORTHERN CENTRAL MOUNTAINS OF
  PENNSYLVANIA.

* HAZARD TYPES...HEAVY SNOW...ACCOMPANIED BY INCREASING NORTH TO
  NORTHWEST WINDS LATE TONIGHT AND MONDAY.

* ACCUMULATIONS...5 TO 10 INCHES.

* TIMING...LATE TONIGHT THROUGH TUESDAY MORNING. THE HEAVIEST
  SNOWFALL RATES OF AROUND AN INCH PER HOUR AT TIMES WILL OCCUR
  LATE TONIGHT THROUGH THE MIDDAY HOURS MONDAY.

* IMPACTS...EXTREMELY HAZARDOUS TRAVEL FROM PERIODS OF HEAVY SNOW
  AND POOR VISIBILITY. THERE IS GREAT POTENTIAL FOR WIDESPREAD
  TREE DAMAGE. THE FALLING TREES AND LIMBS WILL KNOCK DOWN UTILITY
  LINES...LIKELY CAUSING WIDESPREAD POWER OUTAGES...ESPECIALLY
  ACROSS THE HIGHER ELEVATIONS. ANY POWER OUTAGES THAT OCCUR IN
  RURAL LOCATIONS COULD BE LENGTHY.

* WINDS...NORTH TO NORTHEAST 15 TO 20 MPH WITH GUSTS UP TO 30 MPH
  LATE TONIGHT...BECOMING NORTH NORTHWEST AND INCREASING TO 15 TO
  25 MPH WITH GUSTS TO 40 MPH MONDAY.

* TEMPERATURES...32 TO 35 DEGREES.

* VISIBILITIES...BETWEEN ONE QUARTER AND ONE HALF OF A MILE AT TIMES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...
A WINTER STORM WARNING FOR HEAVY SNOW MEANS A SIGNIFICANT AMOUNT
OF SNOW IS FORECAST THAT WILL MAKE TRAVEL DANGEROUS. IN
ADDITION...SINCE SOME TREES ALREADY CONTAIN NEAR FULL-FOLIAGE...
THERE IS THE POTENTIAL FOR DOWNED TREES AND NUMEROUS POWER
OUTAGES FROM THE COMBINED EFFECT OF THE HEAVY WET SNOW AND WIND.
IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...FOOD...BLANKET AND
A CELLULAR PHONE IN YOUR VEHICLE IN CASE OF AN EMERGENCY. STAY
TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE SOURCE OF WEATHER
INFORMATION FOR THE LATEST UPDATES. ADDITIONAL DETAILS CAN ALSO BE
FOUND AT...WEATHER.GOV/STATECOLLEGE. 


&&

$$

PAZ019-025-026-034-035-045-231000-
/O.UPG.KCTP.WS.A.0002.120423T0400Z-120424T1600Z/
/O.NEW.KCTP.WW.Y.0013.120423T0400Z-120424T1000Z/
SOUTHERN CENTRE-BLAIR-HUNTINGDON-BEDFORD-FULTON-SOUTHERN CLINTON-
INCLUDING THE CITIES OF...STATE COLLEGE...ALTOONA...HUNTINGDON...
MOUNT UNION...BEDFORD...MCCONNELLSBURG...LOCK HAVEN
420 PM EDT SUN APR 22 2012

...WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO
6 AM EDT TUESDAY...

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE HAS ISSUED A WINTER
WEATHER ADVISORY FOR HEAVY WET SNOW...WHICH IS IN EFFECT FROM
MIDNIGHT TONIGHT TO 6 AM EDT TUESDAY. THE WINTER STORM WATCH IS NO
LONGER IN EFFECT.

* LOCATIONS...CENTRAL AND SOUTH CENTRAL MOUNTAINS.

* HAZARD TYPES...PERIODS OF HEAVY SNOW...ACCOMPANIED BY INCREASING
  NORTHERLY WINDS LATE TONIGHT AND MONDAY.

* ACCUMULATIONS...2 TO 5 INCHES...WITH AMOUNTS OF AROUND 6 INCHES
  POSSIBLE ON THE RIDGE TOPS.

* TIMING...LATE TONIGHT THROUGH EARLY TUESDAY MORNING.

* IMPACTS...HAZARDOUS TRAVEL FROM PERIODS OF HEAVY SNOW AND POOR
  VISIBILITY. THERE IS ALSO THE POTENTIAL FOR SCATTERED TREE
  DAMAGE. THE FALLING TREES AND LIMBS COULD KNOCK DOWN UTILITY
  LINES...LIKELY CAUSING SOME POWER OUTAGES.

* WINDS...NORTH TO NORTHEAST 15 TO 20 MPH WITH GUSTS UP TO 30 MPH
  LATE TONIGHT...BECOMING NORTHWEST AND INCREASING TO 15 TO 25 MPH
  WITH GUSTS TO 35 MPH MONDAY.

* TEMPERATURES...IN THE LOWER TO MID 30S AT NIGHT...RISING
  SLIGHTLY TO THE MID AND UPPER 30S MONDAY.

* VISIBILITIES...BETWEEN ONE QUARTER AND ONE HALF OF A MILE AT TIMES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...
A WINTER WEATHER ADVISORY FOR SNOW MEANS THAT PERIODS OF SNOW
WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS
AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING. IN
ADDITION...SINCE MANY TREES THROUGHOUT THE VALLEYS ALREADY
CONTAIN NEAR FULL-FOLIAGE...THERE IS THE POTENTIAL FOR DOWNED
TREES AND SCATTERED POWER OUTAGES FROM THE COMBINED EFFECT OF THE
HEAVY WET SNOW AND WIND. STAY TUNED TO NOAA WEATHER RADIO OR
YOUR FAVORITE SOURCE OF WEATHER INFORMATION FOR THE LATEST
UPDATES. ADDITIONAL DETAILS CAN ALSO BE FOUND
AT...WEATHER.GOV/STATECOLLEGE.

&&

$$

LAMBERT/DANGELO/RADZANOWSKI

What forecasters said that day

The local office's own words before this winter storm watch 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 winter storm watch went out at Apr 21, 4:01 PM EDT, 16 minutes earlier.

Area forecast discussion, Apr 21, 4:01 PM EDT, 16 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
401 PM EDT SAT APR 21 2012

.SYNOPSIS...
A COLD FRONT WILL PUSH THROUGH THE CENTRAL MOUNTAINS THIS
AFTERNOON AND INTO EASTERN PENNSYLVANIA BEFORE STALLING THERE
TONIGHT. AN AREA OF LOW PRESSURE WILL ORGANIZE ALONG THE ATLANTIC
COAST AND MOVE NORTHWARD ON SUNDAY. THIS STORM WILL DEEPEN
SIGNIFICANTLY ALONG THE NEW JERSEY COAST SUNDAY NIGHT AND
MONDAY...DRAGGING COLD AIR INTO WESTERN AND CENTRAL PENNSYLVANIA.
THIS WILL BRING A MIX OF RAIN AND SNOW...WITH ACCUMULATING SNOW
OVER HIGHER ELEVATIONS OF THE WEST CENTRAL MOUNTAINS...LAUREL
HIGHLANDS AND CENTRAL MOUNTAINS LATE SUNDAY NIGHT INTO MONDAY
NIGHT. UNSETTLED CONDITIONS WILL LAST INTO MID WEEK AS A DEEP
UPPER TROUGH AND CUT OFF LOW LINGER OVER THE REGION.

&&

.NEAR TERM /UNTIL 9 PM THIS EVENING/...
COLD FRONT IS FIRING UP SOME CELLS...WHICH HAVE NOW PRODUCED SOME
LTG. TO EITHER SIDE OF THIS LINE IS SFC HEATING...BUT STABILITY
PRETTY LOW TO THE WEST OF THE LINE. WILL KEEP THE POPS AND
MENTIONS OF THUNDER TO THE EAST WHERE BEST JUICE AND HEATING IS
CURRENTLY. WIND SHEAR ALONG THE FRONT HAS SPUN ONE OF THE
CELLS...BUT HIGH WINDS WILL BE TOUGH TO TAP INTO. EHI/S VERY LOW
AND HELICITY NOT HIGH...BUT LINEAR FEATURE OF THE FRONT AND
LOCALLY ENHANCED SHEAR WILL BEAR WATCHING. THE RAIN BAND TO THE
WEST IS WAY BEHIND THE FRONT NOW...AND WILL LIKELY CONTINUE TO
SHRIVEL UP THROUGH THE EVENING AS IT TRIES TO GET TO THE EAST.
SPC STILL MENTIONS THE AREA IN THE DAY 1 OUTLOOK...WITH WIND GUSTS
THE HIGHER THREATS.

&&

.SHORT TERM /9 PM THIS EVENING THROUGH 6 PM SUNDAY/...
MODELS AGREE VERY NICELY ON THE EVOLUTION OF THE FEATURES OF NOTE
THROUGH THE PERIOD. FRONT SLIDES EAST TONIGHT...BUT NOT TOO FAR
FROM THE ERN COS. UPPER TROF DIGS TO OUR WEST AND BEGINS TO CUT
OFF LATE TONIGHT OVER THE MID OHIO VALLEY. GOOD SRLY/SERLY BACKING
FLOW ALOFT AHEAD OF THE SFC LOW WILL HELP TO KEEP PRECIP CLOSE TO
IF NOT OVER THE SERN COS TONIGHT. LOW CLOUDS BACK IN THE COLD AIR
WILL HOLD ON OVER MUCH OF THE AREA...AND WILL KEEP TEMPS ABOVE
FREEZING TONIGHT. HOWEVER...THERE COULD BE DRIZZLE OR EVEN A
FLURRY OR TWO IN THE ELEVATIONS OF THE NRN MTS LATE TONIGHT AND
EARLY SUN AM. THE SFC LOW DEEPENS AS IT MOVES INTO THE DELMARVA BY
THE END OF THE DAY ON SUNDAY...WITH PRECIP - RAIN THAT IS - BEING
THROWN BACK STEADILY NW OVER THE FCST AREA THROUGH THE DAY. THIS
WILL MAKE FOR HIGH POPS OVER THE SE IN THE AM...AND OVER MOST OF
THE AREA BY SUNSET. QPF DOES NEAR AN INCH BY THE END OF THE
PERIOD...BUT IT IS STRATIFORM IN NATURE AND FFG HIGH WITH THE
VERY DRY LAST FEW WEEKS WE HAVE HAD.

&&

.LONG TERM /SUNDAY NIGHT THROUGH SATURDAY/...
ISSUED WINTER STORM WATCH FOR LATER SUNDAY NIGHT INTO TUE
MORNING. COMBINATION OF STRONG SYSTEM GOING NEGATIVE TILT...
ADVECTION OF COLD AIR JUST TO THE NORTH...AND STRONG UPWARD
MOTION...WILL RESULT IN THE POTENTIAL OF HEAVY WET SNOW
WEST OF A DEEP LOW TRACKING NW INTO EASTERN PA ON MONDAY.

DID NOT GO TOO FAR EAST WITH THE WATCH...AS THE AIRMASS WILL
BE SLIGHTLY WARMER...LESS QPF...AND EAST OF WHERE OTHERS AND
HPC HAS INDICATED CONCERN.

HELD WATCH UNTIL 16Z TUE...AS IT MAY TAKE SOME TIME FOR
THINGS TO WARM UP.

CHC OF SHOWERS ON WED...AS ANOTHER FRONT DROPS SE.

MOST OF THE REST OF THE WEEK LOOKS DRY AND COOL...AS
HIGH PRESSURE TO THE NW BUILDS SE.

&&

.AVIATION /20Z SATURDAY THROUGH THURSDAY/...
A COLD FRONT WILL CONTINUE TO PUSH EASTWARD ACROSS PA THIS
AFTN/EVE...ACCOMPANIED BY SCATTERED SHOWERS. ISOLD TSTMS ARE
POSSIBLE JUST AHEAD OF THE FRONT...OVER EASTERN TERMINALS. LOW
CIGS WILL PERSIST AT BFD AND JST..WITH UPSLOPE FLOW BEHIND THE
FRONT.

ANY LINGERING PRECIP PULLS EAST OF AREA TONIGHT...ALTHOUGH LOW
CLOUDS AND REDUCED CIGS /WIDESPREAD MVFR-IFR/ WILL CONTINUE TO
IMPACT THE REGION.

LOW PRESSURE IS EXPECTED TO DEVELOP ALONG THE MID-ATLANTIC COAST
SUNDAY. THE PRECIP SHIELD WITH THIS SYSTEM WILL PUSH NORTHWARD
INTO THE AREA LATE SUNDAY...BRINGING AN EXTENDED PERIOD OF POOR
FLYING CONDS THAT WILL LAST INTO MONDAY. IT SHOULD BE COLD ENOUGH
FOR WET SNOW TO AFFECT HIGHER ELEVATIONS TAF SITES /BFD AND JST/
SUNDAY NIGHT INTO MONDAY.

CONDS WILL SLOWLY BEGIN TO IMPROVE TUES...AS LOW PRESSURE PULLS
NORTHWARD AND AWAY FROM THE REGION.

OUTLOOK...
SUN...VFR/MVFR NW. RAIN AND MVFR/IFR DEVELOPING SE.
SUN NGT-MON...MVFR/IFR LIKELY IN RAIN/SNOW.
TUE...MVFR PERSISTING...ESPECIALLY NW.
WED-THU...GENERALLY VFR.

&&

.CTP WATCHES/WARNINGS/ADVISORIES...
WINTER STORM WATCH FROM SUNDAY EVENING THROUGH TUESDAY MORNING
FOR PAZ004>006-010-011-017-024-033-037.

&&

SYNOPSIS...DANGELO
NEAR TERM...DANGELO
SHORT TERM...DANGELO
LONG TERM...MARTIN
AVIATION...EVANEGO
Hazardous weather outlook, Apr 21, 9:54 AM EDT, 6 hours 23 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
954 AM EDT SAT APR 21 2012

PAZ004>006-010>012-017-018-024-033-037-041-042-221400-
WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD-
NORTHERN CENTRE-CAMBRIA-SOMERSET-TIOGA-NORTHERN LYCOMING-SULLIVAN-
954 AM EDT SAT APR 21 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

HAZARDOUS WEATHER IS NOT EXPECTED TODAY OR TONIGHT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

AN AREA OF LOW PRESSURE WILL DEVELOP ALONG THE MID ATLANTIC COAST
ON SUNDAY AND MOVE INTO THE PIEDMONT REGION OF SOUTHEAST
PENNSYLVANIA SUNDAY NIGHT AND MONDAY. THE STORM WILL TAP COLDER
AIR OVER THE CENTRAL AND EASTERN GREAT LAKES...SUPPORTING A MIX OR
CHANGEOVER TO SNOW OVER HIGHER ELEVATIONS OF WESTERN AND CENTRAL
PENNSYLVANIA SUNDAY NIGHT AND MONDAY. SOME WET ACCUMULATION OF
SNOW IS POSSIBLE OVER HIGHER ELEVATIONS OF THE WESTERN MOUNTAINS
AND LAUREL HIGHLANDS...POSSIBLY EXTENDING INTO THE CENTRAL AND
NORTHERN MOUNTAINS. WHILE UNCERTAINTY REMAINS TOO HIGH TO FORECAST
AMOUNTS AT THIS TIME...ANY ACCUMULATION OF WET SNOWFALL COULD BE
POTENTIALLY DAMAGING GIVEN MUCH EARLIER LEAF OUT THAN USUAL DUE TO
EXTREMELY WARM CONDITIONS IN MARCH AND EARLY APRIL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

PAZ028-036-049>053-056>059-063>066-221400-
JUNIATA-FRANKLIN-UNION-SNYDER-MONTOUR-NORTHUMBERLAND-COLUMBIA-PERRY-
DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-ADAMS-YORK-LANCASTER-
954 AM EDT SAT APR 21 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON. SOME OF
THESE STORMS COULD PRODUCE GUSTY WINDS. AT THIS TIME...THE THREAT
FOR DAMAGING WINDS AND HAIL LOOK LOW.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

AN AREA OF LOW PRESSURE WILL DEVELOP ALONG THE MID ATLANTIC COAST
ON SUNDAY AND MOVE INTO THE PIEDMONT REGION OF SOUTHEAST
PENNSYLVANIA SUNDAY NIGHT AND MONDAY. THE STORM WILL TAP COLDER
AIR OVER THE CENTRAL AND EASTERN GREAT LAKES...SUPPORTING A MIX OR
CHANGEOVER TO SNOW OVER HIGHER ELEVATIONS OF WESTERN AND CENTRAL
PENNSYLVANIA SUNDAY NIGHT AND MONDAY. SOME WET ACCUMULATION OF
SNOW IS POSSIBLE OVER HIGHER ELEVATIONS OF THE WESTERN MOUNTAINS
AND LAUREL HIGHLANDS...POSSIBLY EXTENDING INTO THE CENTRAL AND
NORTHERN MOUNTAINS. WHILE UNCERTAINTY REMAINS TOO HIGH TO FORECAST
AMOUNTS AT THIS TIME...ANY ACCUMULATION OF WET SNOWFALL COULD BE
POTENTIALLY DAMAGING GIVEN MUCH EARLIER LEAF OUT THAN USUAL DUE TO
EXTREMELY WARM CONDITIONS IN MARCH AND EARLY APRIL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

PAZ019-025>027-034-035-045-046-221400-
SOUTHERN CENTRE-BLAIR-HUNTINGDON-MIFFLIN-BEDFORD-FULTON-
SOUTHERN CLINTON-SOUTHERN LYCOMING-
954 AM EDT SAT APR 21 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

AN AREA OF LOW PRESSURE WILL DEVELOP ALONG THE MID ATLANTIC COAST
ON SUNDAY AND MOVE INTO THE PIEDMONT REGION OF SOUTHEAST
PENNSYLVANIA SUNDAY NIGHT AND MONDAY. THE STORM WILL TAP COLDER
AIR OVER THE CENTRAL AND EASTERN GREAT LAKES...SUPPORTING A MIX OR
CHANGEOVER TO SNOW OVER HIGHER ELEVATIONS OF WESTERN AND CENTRAL
PENNSYLVANIA SUNDAY NIGHT AND MONDAY. SOME WET ACCUMULATION OF
SNOW IS POSSIBLE OVER HIGHER ELEVATIONS OF THE WESTERN MOUNTAINS
AND LAUREL HIGHLANDS...POSSIBLY EXTENDING INTO THE CENTRAL AND
NORTHERN MOUNTAINS. WHILE UNCERTAINTY REMAINS TOO HIGH TO FORECAST
AMOUNTS AT THIS TIME...ANY ACCUMULATION OF WET SNOWFALL COULD BE
POTENTIALLY DAMAGING GIVEN MUCH EARLIER LEAF OUT THAN USUAL DUE TO
EXTREMELY WARM CONDITIONS IN MARCH AND EARLY APRIL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

DANGELO

In the hours before

Special weather statement, Apr 21, 2:23 PM EDT, 1 hour 54 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
223 PM EDT SAT APR 21 2012

PAZ056-211900-
PERRY PA-
223 PM EDT SAT APR 21 2012

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL AND EASTERN PERRY
COUNTY...

AT 219 PM EDT...A STRONG THUNDERSTORM WAS NEAR LANDISBURG...MOVING
NORTHEAST AT 25 MPH. WIND GUSTS TO 40 MPH AND PEA SIZE HAIL ARE
POSSIBLE WITH THIS STORM. THIS STORM WILL AFFECT
NEW BLOOMFIELD...NEWPORT...DUNCANNON AND LIVERPOOL.

THIS WILL IMPACT ROUTE 322/22.

LAT...LON 4030 7734 4042 7737 4057 7714 4062 7697
      4036 7704

FORECASTER: DANGELO
Special weather statement, Apr 21, 2:51 PM EDT, 1 hour 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
251 PM EDT SAT APR 21 2012

PAZ036-064-211945-
ADAMS PA-FRANKLIN PA-
251 PM EDT SAT APR 21 2012

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN FRANKLIN AND
SOUTHWESTERN ADAMS COUNTIES...

AT 249 PM EDT...A STRONG THUNDERSTORM WAS NEAR CONOCOCHEAGUE...MOVING
NORTHEAST AT 15 MPH.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.
THIS STORM WILL AFFECT GREENCASTLE...WAYNESBORO AND MONT ALTO.

THIS WILL IMPACT I-81 BETWEEN MILE MARKERS 1 AND 22.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11...ROUTE
30.

LAT...LON 4001 7757 3981 7733 3971 7749 3972 7789

FORECASTER: MARTIN
Special weather statement, Apr 21, 3:03 PM EDT, 1 hour 14 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
303 PM EDT SAT APR 21 2012

PAZ050-052-056>058-212000-
DAUPHIN PA-NORTHUMBERLAND PA-PERRY PA-SCHUYLKILL PA-SNYDER PA-
303 PM EDT SAT APR 21 2012

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN PERRY...NORTHERN
DAUPHIN...SOUTHEASTERN SNYDER...SOUTHWESTERN NORTHUMBERLAND AND WEST
CENTRAL SCHUYLKILL COUNTIES...

AT 258 PM EDT...A STRONG THUNDERSTORM WAS NEAR AMITY HALL...MOVING
NORTHEAST AT 15 MPH.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.
THIS STORM WILL AFFECT MONTGOMERY FERRY...MILLERSBURG...
ELIZABETHVILLE...BERRYSBURG AND PILLOW.

THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11/15...ROUTE
209...ROUTE 322/22.

LAT...LON 4035 7705 4048 7720 4060 7706 4061 7700
      4064 7694 4065 7695 4064 7700 4065 7700
      4083 7678 4063 7654

FORECASTER: MARTIN
Special weather statement, Apr 21, 3:09 PM EDT, 1 hour 8 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
309 PM EDT SAT APR 21 2012

PAZ063>065-212015-
ADAMS PA-CUMBERLAND PA-YORK PA-
309 PM EDT SAT APR 21 2012

...A STRONG THUNDERSTORM WILL AFFECT EASTERN CUMBERLAND...NORTHERN
ADAMS AND NORTHWESTERN YORK COUNTIES...

AT 306 PM EDT...A STRONG THUNDERSTORM WAS NEAR BENDERSVILLE...MOVING
NORTHEAST AT 20 MPH.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.
THIS STORM WILL AFFECT PINE GROVE FURNACE...MOUNT HOLLY SPRING...
BOILING SPRINGS...DILLSBURG...HOGESTOWN AND SIDDONSBURG.

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 228 AND 243...I-81 BETWEEN
MILE MARKERS 46 AND 64...I-83 BETWEEN MILE MARKERS 30 AND 42.

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

LAT...LON 3988 7737 4003 7749 4032 7698 4032 7694
      4029 7692 4026 7691 4025 7689 4010 7677

FORECASTER: MARTIN
Special weather statement, Apr 21, 3:32 PM EDT, 45 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
332 PM EDT SAT APR 21 2012

PAZ057>059-212000-
DAUPHIN PA-LEBANON PA-SCHUYLKILL PA-
332 PM EDT SAT APR 21 2012

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN DAUPHIN...NORTHWESTERN
LEBANON AND SOUTHWESTERN SCHUYLKILL COUNTIES...

AT 328 PM EDT...A STRONG THUNDERSTORM WAS NEAR HALIFAX...MOVING
NORTHEAST AT 25 MPH.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.
THIS STORM WILL AFFECT ELIZABETHVILLE...LYKENS AND WILLIAMSTOWN.

THIS WILL IMPACT I-81 BETWEEN MILE MARKERS 96 AND 98.

THIS WILL ALSO IMPACT ROUTE 209.

LAT...LON 4051 7644 4043 7688 4055 7694 4066 7673
      4065 7670 4067 7670 4070 7658

FORECASTER: EVANEGO

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 21, 2:23 PM EDTSpecial Weather StatementCTPPerry37 min
Apr 21, 2:51 PM EDTSpecial Weather StatementCTPFranklin54 min
Apr 21, 3:03 PM EDTSpecial Weather StatementCTPDauphin57 min
Apr 21, 3:09 PM EDTSpecial Weather StatementCTPCumberland66 min
Apr 21, 3:32 PM EDTSpecial Weather StatementCTPDauphin28 min
Apr 21, 4:46 PM EDTSpecial Weather StatementCTPSchuylkill89 min
Apr 21, 5:09 PM EDTSpecial Weather StatementCTPSchuylkill36 min
Apr 21, 5:12 PM EDTSpecial Weather StatementCTPLebanon33 min
Apr 21, 6:57 PM EDTSpecial Weather StatementCTPLancaster78 min
Apr 21, 7:31 PM EDTSpecial Weather StatementCTPLancaster74 min

Nearby

Winter Storm Watches in Pennsylvania, 2012Every winter storm watch in 2012

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.