Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 3, NWS State College, PA

April 16, 20114 counties in Pennsylvania

NWS State College, PA issued this flash flood warning at Apr 16, 2011, 5:38 PM EDT for 4 counties in Pennsylvania. It was in force for 7 hr. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Apr 16, 2011, 5:38 PM EDT (21:38 UTC)
Expired
Apr 17, 2011, 12:30 AM EDT
In force
7 hr
Issued by
NWS State College, PA
Area
Storm-based polygon
Flood severity
None

Counties Dauphin County, PA, Lancaster County, PA, Lebanon County, PA, York County, PA

The radar

The State College radar (KCCX), 115 km from the middle of the area, began a volume at 21:41 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.

What was reported inside it

TimeReportWhereRemark
Apr 16, 6:45 PM EDTFLASH FLOODLinglestown, PASMALL STREAM FLOODING AND ROADS FLOODED
Apr 16, 9:00 PM EDTFLASH FLOOD4 Ssw Cherry Hill, PAWATER .ESCUE IN FAIRVIEW TOWNSHIP
Apr 16, 9:01 PM EDTFLASH FLOODLebanon, PAQUITTAPHILLA CREEK FLOODED FROM 22ND STREET IN LEBANON TO RTE 442 IN ANNVILLE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.6 hours before the alert went out and 156 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 12:00Z on 2011-04-16Temperature 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, Washington/Dulle, VA at 12:00Z on 2011-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 473 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
533 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
473 m²/s²
0-3 km storm-relative helicity
699 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.

588 
WGUS51 KCTP 162138
FFWCTP
PAC043-071-075-133-170130-
/O.NEW.KCTP.FF.W.0003.110416T2138Z-110417T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
538 PM EDT SAT APR 16 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DAUPHIN COUNTY...
  NORTHWESTERN LANCASTER COUNTY...
  LEBANON COUNTY...
  NORTHWESTERN YORK COUNTY...

* UNTIL 930 PM EDT...

* AT 533 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM THUNDERSTORMS OVER DAUPHIN...LEBANON...  
  NORTHWESTERN LANCASTER AND NORTHWESTERN YORK COUNTIES. MUCH OF THE
  AREA HAS ALREADY HAD MORE THAN AN INCH OF RAIN THIS AFTERNOON. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  ELIZABETHTOWN...ANNVILLE...CORNWALL...LEBANON...MYERSTOWN...
  PALMYRA...COLONIAL PARK...HARRISBURG...HERSHEY...HUMMELSTOWN...
  LINGLESTOWN...MIDDLETOWN...PROGRESS AND STEELTON.

ADDITIONAL RAINFALL AMOUNTS OF 2 ARE POSSIBLE IN THE WARNED AREA 
BEFORE 7 PM. THIS RAINFALL WILL LEAD TO FLASH FLOODING...ESPECIALLY 
IN THE URBAN AREA OF HARRISBURG.



LAT...LON 4001 7701 4007 7713 4015 7703 4016 7691
      4020 7693 4022 7686 4028 7692 4035 7693
      4036 7700 4038 7703 4042 7701 4047 7695
      4056 7699 4063 7695 4060 7692 4066 7671
      4031 7614 3993 7697

$$

FORECASTER: DANGELO
2 follow-up statements
428 
WGUS71 KCTP 162330
FFSCTP

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
730 PM EDT SAT APR 16 2011

PAC043-071-075-133-170130-
/O.CON.KCTP.FF.W.0003.000000T0000Z-110417T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DAUPHIN PA-LANCASTER PA-LEBANON PA-YORK PA-
730 PM EDT SAT APR 16 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM EDT FOR
NORTHWESTERN YORK...LEBANON...NORTHWESTERN LANCASTER AND DAUPHIN
COUNTIES...

TRAINED WEATHER SPOTTERS AND LAW ENFORCEMENT PERSONNEL HAVE REPORTED 
FLASH FLOODING OCCURRING THROUGHOUT DAUPHIN...LEBANON AND 
NORTHWESTERN YORK COUNTIES. HEAVY RAIN IS MOVING BACK INTO THE 
REGION...AND THIS WILL ONLY WORSEN THE FLOODING. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
ELIZABETHTOWN...ANNVILLE...CORNWALL...LEBANON...MYERSTOWN...
PALMYRA...COLONIAL PARK...HARRISBURG...HERSHEY...HUMMELSTOWN...
LINGLESTOWN...MIDDLETOWN...PROGRESS AND STEELTON.

ADDITIONAL RAINFALL AMOUNTS OF AN INCH OR MORE ARE POSSIBLE IN THE 
WARNED AREA BEFORE 9 PM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS 
SAFELY. MOVE TO HIGHER GROUND. HEED ALL ROAD CLOSURES.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 4001 7701 4007 7713 4015 7703 4016 7691
      4020 7693 4022 7686 4028 7692 4035 7693
      4036 7700 4038 7703 4042 7701 4047 7695
      4056 7699 4063 7695 4060 7692 4066 7671
      4031 7614 3993 7697

$$

FORECASTER: DANGELO
065 
WGUS51 KCTP 170125
FFWCTP
PAC043-071-075-133-170430-
/O.EXT.KCTP.FF.W.0003.000000T0000Z-110417T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
925 PM EDT SAT APR 16 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  DAUPHIN COUNTY...
  NORTHWESTERN LANCASTER COUNTY...
  LEBANON COUNTY...
  NORTHWESTERN YORK COUNTY...

* UNTIL 1230 AM EDT...

* AT 914 PM EDT...FLASH FLOODING WAS REPORTED FROM HEAVY RAINFALL    
  OVER DAUPHIN...LEBANON...NORTHWESTERN LANCASTER AND NORTHWESTERN   
  YORK COUNTIES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  ELIZABETHTOWN...ANNVILLE...CORNWALL...LEBANON...MYERSTOWN...
  PALMYRA...COLONIAL PARK...HARRISBURG...HERSHEY...HUMMELSTOWN...
  LINGLESTOWN...MIDDLETOWN...PROGRESS AND STEELTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. NEVER ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR IN AN
AUTOMOBILE. TURN AROUND DON'T DROWN!

&&

LAT...LON 4001 7701 4007 7713 4015 7703 4016 7691
      4020 7693 4022 7686 4028 7692 4035 7693
      4036 7700 4038 7703 4042 7701 4047 7695
      4056 7699 4063 7695 4060 7692 4066 7671
      4031 7614 3993 7697

$$

FORECASTER: CR

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 16, 2:52 PM EDTAreal Flood AdvisoryCTPBedford, Blair, Cambria, Centre, Clearfield, Fulton and 4 more3 hr
Apr 16, 3:42 PM EDTRiver Flood WarningCTPHuntingdon27 hr
Apr 16, 3:53 PM EDTSpecial Weather StatementCTPAdams37 min
Apr 16, 4:01 PM EDTSevere Thunderstorm WarningCTPAdams, Cumberland, Dauphin, Franklin, Lancaster, Perry and 1 more59 min
Apr 16, 4:39 PM EDTAreal Flood WarningCTPAdams, Centre, Clinton, Columbia, Cumberland, Dauphin and 17 more20 hr
Apr 16, 4:50 PM EDTFlash Flood WarningCTPAdams5 hr
Apr 16, 4:53 PM EDTSevere Thunderstorm WarningCTPCumberland, Franklin, Fulton, Perry37 min
Apr 16, 5:24 PM EDTFlash Flood WarningCTPCumberland5 hr
Apr 16, 5:59 PM EDTSevere Thunderstorm WarningCTPAdams, Cumberland, Franklin46 min
Apr 16, 6:04 PM EDTFlash Flood WarningCTPFranklin5 hr
Apr 16, 6:27 PM EDTRiver Flood WarningCTPCentre, Snyder, Union8 hr
Apr 16, 6:27 PM EDTRiver Flood WarningCTPCumberland50 hr
Apr 16, 6:27 PM EDTRiver Flood WarningCTPCumberland, York44 hr
Apr 16, 6:31 PM EDTSpecial Weather StatementCTPDauphin44 min
Apr 16, 6:46 PM EDTSpecial Weather StatementCTPAdams, Lancaster, York29 min
Apr 16, 7:21 PM EDTSpecial Weather StatementCTPDauphin39 min
Apr 16, 7:27 PM EDTFlash Flood WarningCTPSchuylkill5 hr
Apr 16, 7:47 PM EDTSevere Thunderstorm WarningCTPAdams, Dauphin, Lancaster, York43 min
Apr 16, 7:52 PM EDTRiver Flood WarningCTPPerry19 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2011Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.