Alert archive / Pennsylvania / Special Weather Statements in 2011

Special Weather Statement, NWS State College, PA

April 28, 2011York County, Pennsylvania

NWS State College, PA issued this special weather statement at Apr 28, 2011, 7:59 AM EDT for York County, Pennsylvania. It was in force for 46 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: Apr 28, 2011, 7:59 AM EDT (11:59 UTC)
Expired: Apr 28, 2011, 8:45 AM EDT
In force: 46 min
Issued by: NWS State College, PA

County York County, PA

The radar

The Sterling radar (KLWX), 116 km from the middle of the area, began a volume at 12:00 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, 12.0 hours before the alert went out and 114 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: 1143 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 834 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 283 m²/s²
0-3 km storm-relative helicity: 353 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 14.0

Open this sounding in Storm Lab

The text

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

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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 Apr 28, 6:55 AM EDT, 1 hour 4 minutes earlier.

Area forecast discussion, Apr 28, 6:55 AM EDT, 1 hour 4 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
655 AM EDT THU APR 28 2011

.SYNOPSIS...
A COLD FRONT WILL PUSH EAST ACROSS THE REGION TODAY. NUMEROUS
SHOWERS AND THUNDERSTORMS ARE EXPECTED...SOME CONTAINING HEAVY
RAINFALL AND GUSTY WINDS. COOLER...AND DRIER AIR WILL ARRIVE
AFTER THE FRONT PASSES AND WILL LAST INTO FRIDAY. A SLOW MOVING
FRONTAL BOUNDARY WILL MOVE INTO THE REGION LATE SUNDAY AND MAY
LINGER WITH CLOUDY AND SHOWERY WEATHER INTO THE MIDDLE OF NEXT
WEEK.

&&

.NEAR TERM /UNTIL NOON TODAY/...
SCT SHRA WILL LINGER ALL MORNING FOR MUCH OF THE AREA. COLD FRONT
MOVING INTO WRN COS SHORTLY. POSTED A WIND ADVY FOR THE W FOR THIS
AM...AS GUSTS COULD REACH 40-45KTS ON THE HILLS PER UPSTREAM OBS.
FLASH FLOODING SHOULD START TO RECEDE SHORTLY...AND MANY WARNINGS
HAVE BEEN ALLOWED TO DIE OFF. MINOR FLOODING MAY CONTINUE FOR THE
MORNING.

&&

.SHORT TERM /NOON TODAY THROUGH 6 PM FRIDAY/...
PERSISTENCE FORECAST IN STORE FOR THESE PERIODS OF THE FCST...AS
LITTLE CHANGE SEEMED TO BE IN ORDER...AND ACTIVE CURRENT WEATHER
PRECLUDES FURTHER DIAGNOSES. SHOWERS EARLY THIS AFTERNOON IN THE
FAR EAST WILL MOVE AWAY AND THEY WILL MOVE INTO THE NW. WILL
ADJUST POPS APPROPRIATELY. LITTLE CHANGE IN TEMPS AS COLD AIR
RUSHES IN. TONIGHT...MINS DROP TO THE U30S AND M40S...WITH WINDS
DECREASING TO LESS THAN 10 MPH OVER MOST OF THE AREA.

FRI LOOKS LESS BREEZY AND SHRA STAY CONTAINED IN THE NWRN MTS.

&&

.LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/...
AFTER A NUMBER OF DAYS WITH SHOWERS AND THUNDERSTORMS THIS COMING
WEEKEND LOOKS TO BE SUNNY AND DRY WITH SEASONABLE TEMPS.  LATE
SUNDAY NIGHT A WARM FRONT WILL BRING SHOWERS INTO WESTERN PA. GEFS
SHOWS THIS FRONTAL BOUNDARY MOVING SLOWLY ACROSS THE STATE WITH
LIGHT SHOWERS AND CLOUDY WEATHER THROUGH TUESDAY. THE 00Z ECMWF IS
MUCH MORE AGGRESSIVE WITH THIS SYSTEM BY MIDWEEK AS THE PATTERN
BECOMES NEGATIVELY TILTED. HAVE LEANED TOWARD THE MORE PROGRESSIVE
SOLUTION WITH GENERALLY BELOW NORMAL TEMPS FOR THE BEGINNING OF
NEXT WEEK AND CHANCE POPS. THERE IS SOME UNCERTAINTY WITH HOW FAST
THIS FRONT WILL MOVE THROUGH THE AREA AND HOW MUCH RAIN WILL FALL.
HOWEVER...AT THIS POINT IT LOOKS TO BE SLIGHTLY WETTER THAN NORMAL
AND SLIGHTLY BELOW NORMAL TEMPS.

&&

.AVIATION /12Z THURSDAY THROUGH MONDAY/...
LATE NIGHT SCATTERED
ISOLATED THUNDERSTORMS AND WIDESPREAD SHOWERS CONTINUE TO SPREAD
ACROSS CENTRAL PA OVERNIGHT. THESE SHOWERS AND STORMS WILL MOVE TO
THE NE AND SHOULD PERSIST THROUGH EARLY MORNING. WIDESPREAD VFR
FLYING CONDITIONS CURRENTLY...EXCEPT IN AND AROUND THUNDERSTORMS
WHERE IFR CIGS AND VSBYS WILL OCCUR. POSSIBLE WIND GUSTS OF
UPWARDS OF 50MPH IN AND AROUND THUNDERSTORMS IS POSSIBLE. THE
MAJOR THREAT OF THESE STORMS IS GUSTY WINDS AND HEAVY RAIN.

VFR WILL DOMINATE TOWARDS DAYLIGHT...THOUGH AREAS OF IFR CIGS AND VSBYS
WILL ACCOMPANY THE TSRA. LLWS AND STRONG WINDS ALOFT IS THE OTHER
ISSUE FOR THE NEXT 24 HOURS. STRONG LLWS OF UPWARDS OF 50-60KTS
WILL AFFECT ALL TAF SITES..CONTINUING THROUGH 15Z IN THE KMDT TO
KLNS AREAS.

WE SWAP THE LLWS FOR DEEP MECHANICAL MIXING AND A GOOD CHANCE FOR STRONG/GUSTY
WSW SFC WINDS IN THE WAKE OF THE CFROPA THURSDAY OVER CENTRAL AND
WRN PENN. SFC WIND GUSTS OF 30-40 KTS LIKELY DURING THE DAY WITH
STRONG WINDS CONTINUING ALOFT...ESP ACROSS THE HIGHER TERRAIN
FROM KJST TO KBFD...WHERE THE COOLER/MOIST UPSLOPE FLOW INTO THE
MTNS WILL FORM MVFR TO IFR BKN-OVC CLOUDS. SCATTERED SHOWERS
TOMORROW AFTERNOON COULD BRING TEMPORARY CONDITIONS OF MVFR CIGS
THOUGH MOST SHOWERS SHOULD BE LIGHT...WINDS LOOK TO CEASE SHORTLY
AFTER O2Z AS THE INVERSION STRENGTHENS.

OUTLOOK...
THU NIGHT/FRI...SCTD MVFR CIGS EARLY..OTHERWISE VFR.
SAT AND SAT NIGHT...MAINLY VFR AS A LARGE AREA OF HIGH PRESSURE
AND RELATIVELY LIGHT WIND DRIFTS EAST ACROSS THE REGION.
SUN...VFR WITH INCREASED CHANCE AFTERNOON SHOWERS AS A COLD FRONT
APPROACHES.
MON...VFR.

&&

.CTP WATCHES/WARNINGS/ADVISORIES...
WIND ADVISORY UNTIL NOON EDT TODAY FOR PAZ004>006-010-011-017-
024-033.
FLASH FLOOD WATCH UNTIL 10 AM EDT THIS MORNING FOR PAZ051>053-
056>059-063>065.

&&

SYNOPSIS...DANGELO
NEAR TERM...DANGELO
SHORT TERM...DANGELO
LONG TERM...KREKELER
AVIATION...LAMBERT/CERU

Hazardous weather outlook, Apr 28, 7:02 AM EDT, 57 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE STATE COLLEGE PA
702 AM EDT THU APR 28 2011

PAZ004>006-010-011-017-024-033-291115-
WARREN-MCKEAN-POTTER-ELK-CAMERON-CLEARFIELD-CAMBRIA-SOMERSET-
702 AM EDT THU APR 28 2011

...WIND ADVISORY IN EFFECT UNTIL NOON EDT TODAY...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO
WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE
INFORMATION ABOUT THE FOLLOWING HAZARDS.

   WIND ADVISORY.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

PAZ051>053-056>059-063>065-291115-
MONTOUR-NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-
CUMBERLAND-ADAMS-YORK-
702 AM EDT THU APR 28 2011

...FLASH FLOOD WATCH IN EFFECT UNTIL 10 AM EDT THIS MORNING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO
WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE
INFORMATION ABOUT THE FOLLOWING HAZARDS.

   FLASH FLOOD WATCH.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

PAZ012-018-019-025>028-034>037-041-042-045-046-049-050-066-291115-
NORTHERN CLINTON-NORTHERN CENTRE-SOUTHERN CENTRE-BLAIR-HUNTINGDON-
MIFFLIN-JUNIATA-BEDFORD-FULTON-FRANKLIN-TIOGA-NORTHERN LYCOMING-
SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-LANCASTER-
702 AM EDT THU APR 28 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA.

.DAY ONE...TODAY AND TONIGHT.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

In the hours before

Local storm report, Apr 28, 6:48 AM EDT, 1 hour 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
648 AM EDT THU APR 28 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0542 AM     TSTM WND DMG     LAKE MEADE              39.97N  77.02W
04/28/2011                   ADAMS              PA   911 CALL CENTER

            WIDESPREAD TREES DOWN

&&

EVENT NUMBER CTP1100069

DANGELO

Special weather statement, Apr 28, 7:11 AM EDT, 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
711 AM EDT THU APR 28 2011

PAZ042-046-049>053-281200-
COLUMBIA PA-MONTOUR PA-NORTHUMBERLAND PA-SNYDER PA-
SOUTHERN LYCOMING PA-SULLIVAN PA-UNION PA-
711 AM EDT THU APR 28 2011

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT COLUMBIA...EASTERN
SNYDER...EASTERN SULLIVAN...EASTERN UNION...MONTOUR...NORTHUMBERLAND
AND SOUTHEASTERN LYCOMING COUNTIES...

AT 709 AM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
ALLENWOOD TO FREMONT...MOVING NORTHEAST AT 60 MPH. WIND GUSTS TO 50
MPH AND PENNY SIZE HAIL ARE POSSIBLE WITH THESE STORMS.

LAT...LON 4062 7694 4065 7695 4064 7700 4068 7705
      4109 7700 4133 7668 4131 7660 4135 7665
      4156 7637 4155 7622 4153 7621 4131 7631
      4121 7632 4114 7627 4114 7622 4097 7621

FORECASTER: DANGELO

Local storm report, Apr 28, 7:31 AM EDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
731 AM EDT THU APR 28 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0700 AM     FLASH FLOOD      5 N LINGLESTOWN         40.42N  76.79W
04/28/2011                   DAUPHIN            PA   TRAINED SPOTTER

            SEVERAL INCHES OF WATER OVER RTE 443

&&

EVENT NUMBER CTP1100070

DANGELO

Special weather statement, Apr 28, 7:50 AM EDT, 9 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
750 AM EDT THU APR 28 2011

PAZ052-056-057-059-063-281215-
CUMBERLAND PA-DAUPHIN PA-LEBANON PA-NORTHUMBERLAND PA-PERRY PA-
750 AM EDT THU APR 28 2011

...A SHOWER WITH STRONG WIND GUSTS WILL AFFECT EASTERN PERRY...NORTH
CENTRAL CUMBERLAND...NORTHERN DAUPHIN...NORTHWESTERN LEBANON AND
SOUTHWESTERN NORTHUMBERLAND COUNTIES...

AT 746 AM EDT...A SHOWER WITH STRONG WIND GUSTS WAS NEAR NEW
BLOOMFIELD...MOVING NORTHEAST AT 40 MPH. WIND GUSTS TO 50 MPH ARE
POSSIBLE WITH THIS SHOWER. THIS SHOWER WILL BE NEAR MONTGOMERY FERRY
AROUND 800 AM...MILLERSBURG AROUND 810 AM AND ELIZABETHVILLE AROUND
820 AM.

LAT...LON 4046 7726 4078 7664 4069 7662 4066 7670
      4059 7660 4047 7656 4024 7716

FORECASTER: DANGELO

Special weather statement, Apr 28, 7:54 AM EDT, 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
754 AM EDT THU APR 28 2011

PAZ059-065-066-281230-
LANCASTER PA-LEBANON PA-YORK PA-
754 AM EDT THU APR 28 2011

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL YORK...NORTHWESTERN
LANCASTER AND SOUTH CENTRAL LEBANON COUNTIES...

AT 750 AM EDT...A STRONG THUNDERSTORM WAS NEAR YORK...MOVING
NORTHEAST AT 50 MPH. WIND GUSTS TO 50 MPH AND PEA SIZE HAIL ARE
POSSIBLE WITH THIS STORM. THIS STORM WILL BE NEAR STONYBROOK AROUND
800 AM...MOUNT JOY AROUND 810 AM...MANHEIM AROUND 820 AM AND
BRICKERVILLE AROUND 830 AM.

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 259 AND 277...I-83 BETWEEN
MILE MARKERS 11 AND 23.

LAT...LON 3987 7670 3995 7679 4019 7661 4020 7657
      4023 7658 4039 7646 4018 7611

FORECASTER: DANGELO

Special weather statement, Apr 28, 7:59 AM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
759 AM EDT THU APR 28 2011

PAZ065-066-281245-
LANCASTER PA-YORK PA-
759 AM EDT THU APR 28 2011

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTH CENTRAL YORK AND
WEST CENTRAL LANCASTER COUNTIES...

AT 756 AM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
LINEBORO TO MANCHESTER TO 14 MILES SOUTHWEST OF MANCHESTER...MOVING
NORTHEAST AT 40 MPH.

WIND GUSTS TO 45 MPH ARE POSSIBLE WITH THESE STORMS. THESE STORMS
WILL BE NEAR CODORUS AROUND 810 AM...LOGANVILLE AROUND 820 AM...
DALLASTOWN AROUND 830 AM...STEWARTSTOWN AROUND 840 AM AND BROGUE
AROUND 850 AM.

THIS WILL IMPACT I-83 BETWEEN MILE MARKERS 1 AND 10.

THIS WILL ALSO IMPACT STATE ROAD 94.

LAT...LON 3973 7697 4003 7639 3990 7640 3973 7643
      3971 7645 3972 7697

FORECASTER: STEINBUGL

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 27, 8:09 PM EDT	Tornado Warning	CTP	Lycoming, Sullivan	26 min
Apr 27, 8:22 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Montour, Northumberland	53 min
Apr 27, 8:46 PM EDT	Severe Thunderstorm Warning	CTP	Columbia, Lycoming, Sullivan, Tioga	44 min
Apr 27, 9:14 PM EDT	Special Weather Statement	CTP	York	31 min
Apr 27, 9:32 PM EDT	Special Weather Statement	CTP	Sullivan	28 min
Apr 27, 10:38 PM EDT	Special Weather Statement	CTP	Cambria	37 min
Apr 27, 10:52 PM EDT	Special Weather Statement	CTP	Clearfield	23 min
Apr 27, 11:09 PM EDT	Special Weather Statement	CTP	Clinton	36 min
Apr 27, 11:19 PM EDT	Special Weather Statement	CTP	Cambria, Centre, Clearfield	41 min
Apr 27, 11:25 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clearfield, Clinton	37 min
Apr 27, 11:59 PM EDT	Special Weather Statement	CTP	Clinton, Lycoming	46 min
Apr 28, 12:14 AM EDT	Special Weather Statement	CTP	Cambria	31 min
Apr 28, 12:19 AM EDT	Special Weather Statement	CTP	Centre, Clinton	41 min
Apr 28, 12:26 AM EDT	Severe Thunderstorm Warning	CTP	Bedford, Somerset	64 min
Apr 28, 12:33 AM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Tioga	57 min
Apr 28, 12:44 AM EDT	Special Weather Statement	CTP	Centre	31 min
Apr 28, 1:02 AM EDT	Special Weather Statement	CTP	Lycoming	43 min
Apr 28, 1:21 AM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Huntingdon, Mifflin	39 min
Apr 28, 1:29 AM EDT	Special Weather Statement	CTP	Clinton	31 min
Apr 28, 1:35 AM EDT	Severe Thunderstorm Warning	CTP	Lycoming, Sullivan	25 min
Apr 28, 1:42 AM EDT	Flash Flood Warning	CTP	Cameron, Clinton, Lycoming, Potter, Sullivan, Tioga	4 hr
Apr 28, 1:42 AM EDT	Special Weather Statement	CTP	Fulton	33 min
Apr 28, 1:44 AM EDT	Flash Flood Warning	CTP	Bedford, Blair, Cambria, Fulton, Huntingdon, Somerset	4 hr
Apr 28, 1:58 AM EDT	Special Weather Statement	CTP	Clinton	47 min
Apr 28, 2:03 AM EDT	Special Weather Statement	CTP	Mifflin	42 min
Apr 28, 2:19 AM EDT	Special Weather Statement	CTP	Huntingdon	41 min
Apr 28, 2:26 AM EDT	Special Weather Statement	CTP	Franklin	34 min
Apr 28, 2:30 AM EDT	Special Weather Statement	CTP	Clinton	30 min
Apr 28, 2:42 AM EDT	Special Weather Statement	CTP	Clinton	33 min
Apr 28, 2:52 AM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Cumberland, Franklin, Juniata, Mifflin and 3 more	53 min
Apr 28, 2:55 AM EDT	Areal Flood Advisory	CTP	Centre, Franklin, Juniata, Mifflin, Perry, Snyder and 1 more	3 hr
Apr 28, 3:02 AM EDT	Flash Flood Warning	CTP	Centre	3 hr
Apr 28, 3:03 AM EDT	Special Weather Statement	CTP	Lycoming, Tioga	42 min
Apr 28, 3:11 AM EDT	Special Weather Statement	CTP	Adams, Franklin	34 min
Apr 28, 3:34 AM EDT	Flash Flood Warning	CTP	Franklin	3 hr
Apr 28, 3:37 AM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton, Dauphin, Juniata, Lycoming, Montour and 4 more	38 min
Apr 28, 3:39 AM EDT	Areal Flood Advisory	CTP	Adams, Cumberland, Dauphin, Montour, Northumberland, York	3 hr
Apr 28, 3:41 AM EDT	Special Weather Statement	CTP	Lycoming	34 min
Apr 28, 3:46 AM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Dauphin, Lancaster, Lebanon, Perry and 1 more	44 min
Apr 28, 4:00 AM EDT	Severe Thunderstorm Warning	CTP	Columbia, Dauphin, Lycoming, Montour, Northumberland, Schuylkill and 1 more	60 min
Apr 28, 4:12 AM EDT	River Flood Warning	CTP	Lycoming	41 hr
Apr 28, 4:12 AM EDT	River Flood Warning	CTP	Lycoming, Northumberland, Union	35 hr
Apr 28, 4:12 AM EDT	River Flood Warning	CTP	Northumberland, Union	41 hr
Apr 28, 4:12 AM EDT	River Flood Warning	CTP	Northumberland, Union	41 hr
Apr 28, 4:12 AM EDT	River Flood Warning	CTP	Columbia, Montour, Northumberland	65 hr
Apr 28, 4:25 AM EDT	Flash Flood Warning	CTP	Adams, Cumberland, Dauphin, Perry, York	7 hr
Apr 28, 4:28 AM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Dauphin, Lancaster, Lebanon, Schuylkill and 1 more	47 min
Apr 28, 5:14 AM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Franklin, York	46 min
Apr 28, 5:35 AM EDT	Tornado Warning	CTP	Adams, Cumberland, York	25 min
Apr 28, 5:49 AM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lebanon, Schuylkill	56 min
Apr 28, 6:13 AM EDT	Flash Flood Warning	CTP	Lebanon, Schuylkill	4 hr
Apr 28, 6:32 AM EDT	Wind Advisory	CTP	Cambria, Cameron, Clearfield, Elk, McKean, Potter and 2 more	5 hr
Apr 28, 6:47 AM EDT	Areal Flood Advisory	CTP	Columbia, Franklin, Fulton, Huntingdon, Juniata, Lycoming and 7 more	3 hr
Apr 28, 6:53 AM EDT	Severe Thunderstorm Warning	CTP	Lebanon, Schuylkill	37 min
Apr 28, 7:11 AM EDT	Special Weather Statement	CTP	Columbia, Montour, Northumberland, Sullivan	49 min
Apr 28, 7:41 AM EDT	River Flood Warning	CTP	Clinton	20 hr
Apr 28, 7:50 AM EDT	Special Weather Statement	CTP	Dauphin	25 min
Apr 28, 7:54 AM EDT	Special Weather Statement	CTP	Lebanon, York	36 min
Apr 28, 8:04 AM EDT	Special Weather Statement	CTP	Adams	26 min
Apr 28, 8:07 AM EDT	River Flood Warning	CTP	Cumberland, York	24 hr
Apr 28, 8:17 AM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	58 min
Apr 28, 8:21 AM EDT	Tornado Warning	CTP	York	24 min
Apr 28, 8:44 AM EDT	Tornado Warning	CTP	Lancaster, York	14 min
Apr 28, 8:54 AM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	66 min
Apr 28, 9:30 AM EDT	Tornado Warning	CTP	Lancaster, York	15 min
Apr 28, 9:58 AM EDT	Tornado Warning	CTP	York	21 min
Apr 28, 10:03 AM EDT	Severe Thunderstorm Warning	CTP	Lancaster, York	27 min
Apr 28, 10:13 AM EDT	Tornado Warning	CTP	Lancaster, York	32 min
Apr 28, 10:26 AM EDT	River Flood Warning	CTP	Dauphin, Juniata, Northumberland, Perry, Union	45 hr
Apr 28, 10:26 AM EDT	River Flood Warning	CTP	Cumberland, Dauphin, Juniata, Lancaster, Northumberland, Perry and 2 more	48 hr
Apr 28, 10:26 AM EDT	River Flood Warning	CTP	Lancaster, York	63 hr
Apr 28, 10:26 AM EDT	River Flood Warning	CTP	Huntingdon	11 hr
Apr 28, 10:35 AM EDT	Severe Thunderstorm Warning	CTP	Lancaster	10 min
Apr 28, 10:49 AM EDT	Special Weather Statement	CTP	Lancaster	26 min
Apr 28, 11:15 AM EDT	Special Weather Statement	CTP	Lancaster	15 min
Apr 28, 12:52 PM EDT	River Flood Warning	CTP	Lycoming	15 hr
Apr 28, 5:55 PM EDT	River Flood Warning	CTP	Dauphin, Lebanon, Schuylkill	10 hr

Nearby

Special Weather Statements in Pennsylvania, 2011 Every special weather statement in 2011

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.