Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 49, NWS State College, PA

September 9, 20118 counties in Pennsylvania

NWS State College, PA issued this flash flood warning at Sep 9, 2011, 6:07 PM EDT for 8 counties in Pennsylvania. It was in force for 3 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
Sep 9, 2011, 6:07 PM EDT (22:07 UTC)
Expired
Sep 9, 2011, 9:15 PM EDT
In force
3 hr
Issued by
NWS State College, PA
Area
Storm-based polygon
Flood severity
None

Counties Adams County, PA, Blair County, PA, Cumberland County, PA, Franklin County, PA, Huntingdon County, PA, Juniata County, PA, Mifflin County, PA, Perry County, PA

The radar

The State College radar (KCCX), 83 km from the middle of the area, began a volume at 22:16 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 9, 8:24 PM EDTFLASH FLOODNewry, PASTREET FLOODING REPORTED IN NEWRY.
Sep 9, 8:24 PM EDTFLASH FLOODNw Duncansville, PAFLOODING REPORTED IN A TRAILER PARK IN ALLEGHENY TWP.
Sep 9, 8:28 PM EDTFLASH FLOODAltoona, PASTREET FLOODING REPORTED IN PARTS OF LOGAN TWP.

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, 10.1 hours before the alert went out and 142 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.

781 
WGUS51 KCTP 092207
FFWCTP
PAC001-013-041-055-061-067-087-099-100115-
/O.NEW.KCTP.FF.W.0049.110909T2207Z-110910T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN ADAMS COUNTY...
  SOUTHERN BLAIR COUNTY...
  CUMBERLAND COUNTY...
  EASTERN FRANKLIN COUNTY...
  CENTRAL HUNTINGDON COUNTY...
  SOUTHWESTERN JUNIATA COUNTY...
  SOUTHWESTERN MIFFLIN COUNTY...
  SOUTHWESTERN PERRY COUNTY...

* UNTIL 915 PM EDT...

* AT 606 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER CENTRAL HUNTINGDON...
  CUMBERLAND...EASTERN FRANKLIN...SOUTHERN BLAIR...SOUTHWESTERN
  JUNIATA...SOUTHWESTERN MIFFLIN...SOUTHWESTERN PERRY AND WESTERN
  ADAMS COUNTIES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  WAYNESBORO...CARLISLE...SHIPPENSBURG...HUNTINGDON...ALTOONA...
  HOLLIDAYSBURG AND GETTYSBURG.

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 4006 7755 4023 7772 4028 7804 4029 7840
      4030 7843 4029 7851 4031 7857 4057 7838
      4059 7780 4046 7732 4009 7711 4007 7713
      4006 7710 3971 7719 3972 7762

$$

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, 5:30 PM EDTFlash Flood WarningCTPBedford, Blair, Cumberland, Franklin, Fulton, Huntingdon3 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; radar from the NEXRAD Level II archive.