Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 41, NWS State College, PA

September 7, 201110 counties in Pennsylvania

NWS State College, PA issued this flash flood warning at Sep 7, 2011, 10:23 AM EDT for 10 counties in Pennsylvania. It was in force for 12 hr. 1 report 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
Sep 7, 2011, 10:23 AM EDT (14:23 UTC)
Expired
Sep 7, 2011, 10:15 PM EDT
In force
12 hr
Issued by
NWS State College, PA
Area
Storm-based polygon
Emergency
Flash flood emergency
Flood severity
None

Counties Columbia County, PA, Dauphin County, PA, Lycoming County, PA, Montour County, PA, Northumberland County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA

The radar

The State College radar (KCCX), 117 km from the middle of the area, began a volume at 14:24 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
Sep 7, 10:28 AM EDTFLOODDushore, PASIGNIFICANT FLOODING IS OCCURING IN DUSHORE.

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, 2.4 hours before the alert went out and 257 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 2011-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2011-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 154 square meters per square second.193958Sfc1 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
1 J/kg
Mixed-layer CIN
-270 J/kg
Mixed-layer LCL
448 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
154 m²/s²
0-3 km storm-relative helicity
184 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.

283 
WGUS51 KCTP 071423
FFWCTP
PAC037-043-081-093-097-107-109-113-117-119-072015-
/O.NEW.KCTP.FF.W.0041.110907T1423Z-110907T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1023 AM EDT WED SEP 7 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  COLUMBIA COUNTY...
  NORTHERN DAUPHIN COUNTY...
  MONTOUR COUNTY...
  WESTERN SCHUYLKILL COUNTY...
  EASTERN SNYDER COUNTY...
  SULLIVAN COUNTY...
  EASTERN TIOGA COUNTY...
  EASTERN UNION COUNTY...
  NORTHUMBERLAND COUNTY...
  EASTERN LYCOMING COUNTY...

* UNTIL 415 PM EDT...

* AT 1012 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR
  ESTIMATES AND RAIN GAGE REPORTS INDICATED VERY HEAVY RAIN FROM A
  LONG BAND OF THUNDERSTORMS OVER MOST OF THE WARNED AREA. THE 
  THUNDERSTORMS IN THE LINE ARE MOVING TO THE NORTH...RIGHT ALONG 
  THE SAME PATHWAY. THIS WILL CREATE EXTREMELY HEAVY RAINFALL...
  AND CAUSE A POTENTIALLY DEADLY SITUATION. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO DANVILLE...
  SELINSGROVE...ASHLAND...MANSFIELD...KULPMONT...MILTON...MOUNT
  CARMEL...NORTHUMBERLAND...SHAMOKIN...SUNBURY...BERWICK...
  BLOOMSBURG...LEWISBURG...MONTOURSVILLE AND WILLIAMSPORT.

ADDITIONAL RAINFALL AMOUNTS OF 2 TO 3 ARE POSSIBLE IN THE WARNED 
AREA THROUGH THE AFTERNOON. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF
RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 4199 7692 4160 7687 4154 7621 4121 7632
      4114 7627 4114 7622 4101 7622 4049 7641
      4066 7669 4057 7697 4064 7694 4064 7698
      4201 7725

$$

FORECASTER: DANGELO
2 follow-up statements
692 
WGUS51 KCTP 071939
FFWCTP
PAC037-043-081-093-097-107-109-113-117-119-080215-
/O.EXT.KCTP.FF.W.0041.000000T0000Z-110908T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
339 PM EDT WED SEP 7 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  COLUMBIA COUNTY...
  NORTHWESTERN DAUPHIN COUNTY...
  MONTOUR COUNTY...
  WESTERN SCHUYLKILL COUNTY...
  EASTERN SNYDER COUNTY...
  SULLIVAN COUNTY...
  EASTERN TIOGA COUNTY...
  EASTERN UNION COUNTY...
  NORTHUMBERLAND COUNTY...
  EASTERN LYCOMING COUNTY...

* UNTIL 1015 PM EDT...

* AT 325 PM EDT...RAIN GAGE REPORTS INDICATED A LARGE AREA OF VERY   
  HEAVY RAIN AND A FEW EMBEDDED THUNDERSTORMS CONTINUING TO TRAIN 
  NORTH ACROSS THE SUSQUEHANNA VALLEY AND ADJACENT NORTH CENTRAL... 
  AND EAST CENTRAL MOUNTAINS. 

  THIS IS A FLASH FLOOD EMERGENCY FOR THE WARNED AREA. NUMEROUS   
  ROADS ARE CLOSED...AND MANY WATER RESCUES AND EVACUATIONS ARE  
  TAKING PLACE. 

  RAINFALL RATES OF ONE HALF INCH...TO ONE INCH PER HOUR WILL
  CONTINUE INTO EARLY THIS EVENING NEAR...AND TO THE EAST OF A
  LINE FROM MANSFIELD...TO MUNCY...SHAMOKIN AND PINE GROVE. LESSER   
  RAINFALL RATES  OF ONE QUARTER...TO ONE HALF OF AN INCH WILL   
  PERSIST FURTHER TO THE WEST.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO DANVILLE...
  SELINSGROVE...ASHLAND...MANSFIELD...KULPMONT...MILTON...MOUNT
  CARMEL...NORTHUMBERLAND...SHAMOKIN...SUNBURY...BERWICK...
  BLOOMSBURG...LEWISBURG...MONTOURSVILLE AND WILLIAMSPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED 
DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED 
BRIDGES...DIPS...OR LOW WATER CROSSINGS. FIND ALTERNATE ROUTES. IT 
TAKES ONLY A FEW INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES 
AWAY. TURN AROUND...DON'T DROWN! NEVER TRY TO CROSS A FLOWING 
STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP 
TO HIGHER GROUND.



&&

LAT...LON 4199 7692 4160 7687 4154 7621 4121 7632
      4114 7627 4114 7622 4101 7622 4049 7641
      4066 7669 4057 7697 4064 7694 4064 7698
      4201 7725

$$

FORECASTER: LAMBERT
540 
WGUS71 KCTP 080031
FFSCTP

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
831 PM EDT WED SEP 7 2011

PAC037-043-081-093-097-107-109-113-117-119-080215-
/O.CON.KCTP.FF.W.0041.000000T0000Z-110908T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COLUMBIA PA-DAUPHIN PA-MONTOUR PA-SCHUYLKILL PA-SNYDER PA-
SULLIVAN PA-TIOGA PA-UNION PA-NORTHUMBERLAND PA-LYCOMING PA-
831 PM EDT WED SEP 7 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM EDT FOR
EASTERN LYCOMING...NORTHUMBERLAND...EASTERN UNION...EASTERN TIOGA...
SULLIVAN...EASTERN SNYDER...WESTERN SCHUYLKILL...MONTOUR...
NORTHWESTERN DAUPHIN AND COLUMBIA COUNTIES...

THIS IS A FLASH FLOOD EMERGENCY FOR THE WARNED AREA. NUMEROUS        
ROADS ARE CLOSED...AND MANY WATER RESCUES AND EVACUATIONS HAVE       
TAKEN PLACE.

AT 820 PM...DOPPLER RADAR SHOWED A LARGE AREA OF HEAVY SHOWERS AND 
EMBEDDED THUNDERSTORMS MOVING NORTH ACROSS THE SUSQUEHANNA VALLEY 
AND ADJACENT NORTHERN MOUNTAINS. HEAVY RAINFALL RATES OF BETWEEN ONE 
HALF OF AN INCH...AND ONE INCH PER HOUR WILL BE OCCURRING THROUGH 
LATE THIS EVENING. 

ADDITIONAL RAINFALL FROM 830 PM TO 1015 PM COULD BE AS HIGH AS 2.5 
INCHES ACROSS THE REGION EAST OF A LINE FROM SHUNK AND BARBOURS...TO 
HUGHESVILLE...DANVILLE AND SHAMOKIN. NEW RAINFALL AMOUNTS FURTHER TO 
THE WEST WILL BE UNDER 1.5 INCHES THROUGH 1015 PM.

THIS IS AN EXTREMELY DANGEROUS...AND POTENTIALLY LIFE THREATENING 
SITUATION...AS MANY STREAMS AND CREEKS ARE ALREADY FLOODING AND 
NUMEROUS ROAD CLOSURES AND WATER RESCUES ARE OCCURRING.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO DANVILLE...
SELINSGROVE...ASHLAND...MANSFIELD...KULPMONT...MILTON...MOUNT
CARMEL...NORTHUMBERLAND...SHAMOKIN...SUNBURY...BERWICK...
BLOOMSBURG...LEWISBURG...MONTOURSVILLE AND WILLIAMSPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE 
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. 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.

PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE BY CALLING YOUR LOCAL
LAW ENFORCEMENT OFFICIALS OR BY CALLING THE NATIONAL WEATHER SERVICE
TOLL FREE AT...1 8 7 7 6 3 3 6 7 7 2.

&&

LAT...LON 4199 7692 4160 7687 4154 7621 4121 7632
      4114 7627 4114 7622 4101 7622 4049 7641
      4066 7669 4057 7697 4064 7694 4064 7698
      4201 7725

$$

FORECASTER: LAMBERT

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 8:32 PM EDTAreal Flood WarningCTPFranklin, Fulton, Huntingdon, Juniata, Mifflin, Perry16 hr
Sep 6, 10:20 PM EDTAreal Flood WarningCTPColumbia, Cumberland, Dauphin, Lycoming, Montour, Northumberland and 3 more14 hr
Sep 6, 11:24 PM EDTRiver Flood WarningCTPHuntingdon22 hr
Sep 6, 11:24 PM EDTRiver Flood WarningCTPClinton31 hr
Sep 6, 11:24 PM EDTRiver Flood WarningCTPBedford18 hr
Sep 7, 2:53 AM EDTAreal Flood AdvisoryCTPBlair, Cambria, Cameron, Centre, Clearfield, Clinton and 8 more6 hr
Sep 7, 4:49 AM EDTRiver Flood WarningCTPLycoming, Sullivan41 hr
Sep 7, 6:15 AM EDTAreal Flood WarningCTPCentre, Clinton, Lycoming6 hr
Sep 7, 6:40 AM EDTSpecial Weather StatementCTPMifflin35 min
Sep 7, 8:32 AM EDTAreal Flood AdvisoryCTPAdams, York3 hr
Sep 7, 9:33 AM EDTFlash Flood Warning EmergencyCTPDauphin, Lancaster, Lebanon, York10 hr
Sep 7, 11:22 AM EDTRiver Flood WarningCTPHuntingdon, Mifflin6 hr
Sep 7, 11:22 AM EDTRiver Flood WarningCTPHuntingdon, Juniata, Mifflin10 hr
Sep 7, 11:22 AM EDTRiver Flood WarningCTPJuniata, Perry10 hr
Sep 7, 11:22 AM EDTRiver Flood WarningCTPColumbia4 days
Sep 7, 11:22 AM EDTRiver Flood WarningCTPColumbia, Montour, Northumberland4 days
Sep 7, 11:22 AM EDTRiver Flood WarningCTPDauphin, Juniata, Northumberland, Perry, Union4 days
Sep 7, 11:22 AM EDTRiver Flood WarningCTPCumberland, Dauphin, Juniata, Lancaster, Northumberland, Perry and 2 more4 days
Sep 7, 11:22 AM EDTRiver Flood WarningCTPLancaster, York4 days
Sep 7, 11:22 AM EDTRiver Flood WarningCTPLycoming49 hr
Sep 7, 11:22 AM EDTRiver Flood WarningCTPLycoming, Northumberland, Union49 hr
Sep 7, 11:22 AM EDTRiver Flood WarningCTPNorthumberland, Union44 hr
Sep 7, 11:22 AM EDTRiver Flood WarningCTPNorthumberland, Union44 hr
Sep 7, 11:22 AM EDTRiver Flood WarningCTPNorthumberland, Union53 hr
Sep 7, 12:09 PM EDTAreal Flood WarningCTPAdams, Centre, Clinton, Columbia, Cumberland, Dauphin and 17 more12 hr
Sep 7, 1:22 PM EDTSpecial Weather StatementCTPLebanon23 min
Sep 7, 2:17 PM EDTSpecial Weather StatementCTPLancaster13 min
Sep 7, 2:56 PM EDTSpecial Weather StatementCTPLancaster34 min
Sep 7, 3:28 PM EDTRiver Flood WarningCTPLancaster, York44 hr
Sep 7, 4:14 PM EDTFlash Flood Warning EmergencyCTPSchuylkill6 hr
Sep 7, 7:00 PM EDTFlash Flood Warning EmergencyCTPDauphin, Lancaster, Lebanon, York6 hr
Sep 7, 7:46 PM EDTSpecial Weather StatementCTPSchuylkill29 min

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.