Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 48, NWS State College, PA

September 9, 20116 counties in Pennsylvania

NWS State College, PA issued this flash flood warning at Sep 9, 2011, 5:30 PM EDT for 6 counties in Pennsylvania. It was in force for 3 hr. 5 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
Sep 9, 2011, 5:30 PM EDT (21:30 UTC)
Expired
Sep 9, 2011, 8:30 PM EDT
In force
3 hr
Issued by
NWS State College, PA
Area
Storm-based polygon
Flood severity
None

Counties Bedford County, PA, Blair County, PA, Cumberland County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA

What was reported inside it

TimeReportWhereRemark
Sep 9, 5:45 PM EDTFLASH FLOODGreencastle, PASPOTTER REPORTED WATER OVER HIGHWAY 16...SIGNIFICANT FLASH FLOODING IN GREENCASTLE.
Sep 9, 6:12 PM EDTFLASH FLOODGreencastle, PAPORTION OF WILLIAMSON AVE IN GREENCASTLE REPORTED TO BE UNDER WATER.
Sep 9, 6:15 PM EDTFLASH FLOODCoaldale, PAWATER IN HOMES AND COVERING PARTS OF MAIN ST.
Sep 9, 6:15 PM EDTFLASH FLOODEverett, PASTRETCHES OF ROUTE 26 UNDER WATER.
Sep 9, 6:15 PM EDTFLASH FLOODW Everett, PAMUDSLIDE BLOCKING STRETCH OF ASHCOM ROAD.

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, 9.5 hours before the alert went out and 140 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 2011-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 881 joules per kilogram.LCLLFCEL10008507005003002001001 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 2011-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 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
881 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
484 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
80 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.

068 
WGUS51 KCTP 092130
FFWCTP
PAC009-013-041-055-057-061-100030-
/O.NEW.KCTP.FF.W.0048.110909T2130Z-110910T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
530 PM EDT FRI SEP 9 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BEDFORD COUNTY...
  SOUTH CENTRAL BLAIR COUNTY...
  WEST CENTRAL CUMBERLAND COUNTY...
  FRANKLIN COUNTY...
  FULTON COUNTY...
  SOUTHERN HUNTINGDON COUNTY...

* UNTIL 830 PM EDT...

* AT 500 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATES
  AND RAIN GAGE REPORTS INDICATED FLASH FLOODING FROM A THUNDERSTORM
  OVER BEDFORD...FRANKLIN...FULTON...SOUTH CENTRAL BLAIR...SOUTHERN
  HUNTINGDON AND WEST CENTRAL CUMBERLAND COUNTIES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  CHAMBERSBURG...GREENCASTLE...SHIPPENSBURG...BEDFORD AND BREEZEWOOD.

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 4013 7866 4029 7858 4032 7813 4027 7769
      4024 7765 4022 7765 4020 7760 4019 7761
      4019 7759 4011 7749 3972 7761 3971 7837

$$

FORECASTER: DEVOIR

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 9, 2:55 AM EDTAreal Flood WarningCTPAdams, Cumberland, Perry6 hr
Sep 9, 9:18 AM EDTAreal Flood WarningCTPDauphin, Lancaster, Lebanon, York8 hr
Sep 9, 11:44 AM EDTAreal Flood AdvisoryCTPBedford, Cambria, Somerset2 hr
Sep 9, 1:42 PM EDTAreal Flood AdvisoryCTPAdams108 min
Sep 9, 2:35 PM EDTFlash Flood WarningCTPBedford, Cambria, Somerset3 hr
Sep 9, 2:50 PM EDTFlash Flood WarningCTPAdams, Cumberland, Franklin, Fulton3 hr
Sep 9, 4:27 PM EDTAreal Flood AdvisoryCTPMcKean, Potter, Warren3 hr
Sep 9, 6:07 PM EDTFlash Flood WarningCTPAdams, Blair, Cumberland, Franklin, Huntingdon, Juniata and 2 more3 hr
Sep 9, 6:54 PM EDTFlash Flood WarningCTPBedford, Blair, Cambria, Clearfield3 hr
Sep 9, 7:06 PM EDTAreal Flood AdvisoryCTPElk3 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.