Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 36, NWS State College, PA

August 28, 2011Columbia County, Lycoming County, Sullivan County, Pennsylvania

NWS State College, PA issued this flash flood warning at Aug 28, 2011, 9:01 AM EDT for Columbia County, Lycoming County, Sullivan County, Pennsylvania. It was in force for 4 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
Aug 28, 2011, 9:01 AM EDT (13:01 UTC)
Expired
Aug 28, 2011, 1:00 PM EDT
In force
4 hr
Issued by
NWS State College, PA
Area
Storm-based polygon
Flood severity
None

Counties Columbia County, PA, Lycoming County, PA, Sullivan County, PA

The radar

The Binghamton radar (KBGM), 100 km from the middle of the area, began a volume at 13:03 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
Aug 28, 11:00 AM EDTFLASH FLOODDushore, PAALL MAJOR ROADS CLOSED IN SULLIVAN COUNTY DUE TO FLOODING. BRIDGE ON RT 487 AND RT 220 WASHED OUT. 30 PEOPLE EVACUATED IN DUSHORE BOROUGH. MULTIPLE WATER RESCUES.

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

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 1.0 hours before the alert went out and 238 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, Buffalo Intl Airport, NY at 12:00Z on 2011-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 9 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, Buffalo Intl Airport, NY at 12:00Z on 2011-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -73 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
9 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
707 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-73 m²/s²
0-3 km storm-relative helicity
-49 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.

208 
WGUS51 KCTP 281301
FFWCTP
PAC037-081-113-281700-
/O.NEW.KCTP.FF.W.0036.110828T1301Z-110828T1700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
901 AM EDT SUN AUG 28 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL COLUMBIA COUNTY...
  SULLIVAN COUNTY...
  NORTHEASTERN LYCOMING COUNTY...

* UNTIL 100 PM EDT...

* AT 848 AM EDT...LOCAL EMERGENCY MANAGEMENT OFFICIALS REPORTED
  THAT UPPER PORTIONS OF LOYALSOCK CREEK AND ITS TRIBUTARIES WERE    
  BEGINNING TO FLOOD. ABOUT 1 FOOT OF WATER WAS REPORTED COVERING 
  STREETS IN DUSHORE. 
  
  AN ADDITIONAL 1 TO 2 HOUR PERIOD OF HEAVY RAIN WILL OCCUR LATE     
  THIS MORNING...AND COULD CAUSE FURTHER FLOODING DOWNSTREAM.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CENTRAL...
  FAIRMOUNT SPRINGS...KETTLE CREEK GORGE...LINCOLN FALLS...MUNCY
  VALLEY...RICKETTS GLEN STATE PARK...SHUNK...BARBOURS...
  BIGGERTOWN...HUGHESVILLE...LAIRDSVILLE...LOYALSOCKVILLE AND
  RALSTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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. 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 4131 7631 4119 7631 4126 7695 4157 7694
      4158 7692 4159 7688 4160 7687 4153 7622

$$

FORECASTER: LAMBERT/GRUMM

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 2:37 AM EDTAreal Flood WarningCTPLancaster, York8 hr
Aug 28, 9:20 AM EDTAreal Flood AdvisoryCTPColumbia, Dauphin, Lancaster, Lebanon, Lycoming, Montour and 4 more3 hr
Aug 28, 10:38 AM EDTAreal Flood WarningCTPYork4 hr
Aug 28, 12:39 PM EDTAreal Flood WarningCTPLancaster5 hr
Aug 28, 1:00 PM EDTFlash Flood WarningCTPColumbia, Lycoming, Sullivan4 hr
Aug 28, 7:04 PM EDTRiver Flood WarningCTPLycoming, Sullivan3 hr
Aug 28, 7:43 PM EDTRiver Flood WarningCTPDauphin, Lebanon, Schuylkill5 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.