Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 45, NWS State College, PA

September 7, 2011Adams County, Cumberland County, Perry County, Pennsylvania

NWS State College, PA issued this flash flood warning at Sep 7, 2011, 11:11 PM EDT for Adams County, Cumberland County, Perry County, Pennsylvania. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 7, 2011, 11:11 PM EDT (03:11 UTC)
Expired
Sep 8, 2011, 5:00 AM EDT
In force
6 hr
Issued by
NWS State College, PA
Area
Storm-based polygon
Flood severity
None

Counties Adams County, PA, Cumberland County, PA, Perry County, PA

The radar

The State College radar (KCCX), 111 km from the middle of the area, began a volume at 03:12 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 3.2 hours before the alert went out and 139 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 00:00Z on 2011-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 36 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 00:00Z on 2011-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 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
36 J/kg
Mixed-layer CIN
-101 J/kg
Mixed-layer LCL
504 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
211 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.

299 
WGUS51 KCTP 080311
FFWCTP
PAC001-041-099-080900-
/O.NEW.KCTP.FF.W.0045.110908T0311Z-110908T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1111 PM EDT WED SEP 7 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ADAMS COUNTY...
  CUMBERLAND COUNTY...
  PERRY COUNTY...

* UNTIL 500 AM EDT...

* AT 1059 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  AND AREA OF HEAVY SHOWERS AND THUNDERTSORMS MOVING NORTH INTO THE 
  WARNED AREA. RAINFALL RATES WILL INCREASE OVER THE NEXT HOUR OR 
  TWO...AND FALL AT THE RATE OF ONE HALF TO ONE INCH PER HOUR
  THROUGH 4 AM. ADDITIONAL RAINFALL AMOUNTS OF 2 TO 3 INCHES ARE
  LIKELY IN MANY LOCATIONS OVERNIGHT.   

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CAMP   
  HILL...CARLISLE...ENOLA...LEMOYNE...LOWER ALLEN...MECHANICSBURG
  AND GETTYSBURG.

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.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

&&

LAT...LON 3972 7745 3997 7746 4029 7767 4046 7742
      4055 7718 4059 7717 4063 7695 4056 7699
      4047 7695 4038 7703 4035 7693 4022 7687
      4020 7693 4016 7691 4015 7703 4007 7713
      3994 7697 3986 7695 3983 7700 3973 7700

$$

FORECASTER: LAMBERT

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 10:09 PM EDTFlash Flood Warning EmergencyCTPColumbia, Dauphin, Lycoming, Montour, Northumberland, Schuylkill and 4 more6 hr
Sep 8, 12:33 AM EDTSpecial Weather StatementCTPDauphin27 min
Sep 8, 12:55 AM EDTRiver Flood WarningCTPTioga8 hr
Sep 8, 12:59 AM EDTAreal Flood WarningCTPDauphin, Lancaster, Lebanon, York8 hr
Sep 8, 1:05 AM EDTSpecial Weather StatementCTPDauphin25 min
Sep 8, 1:30 AM EDTSpecial Weather StatementCTPLebanon30 min
Sep 8, 1:33 AM EDTSpecial Weather StatementCTPDauphin27 min
Sep 8, 1:52 AM EDTSpecial Weather StatementCTPNorthumberland23 min
Sep 8, 1:58 AM EDTSpecial Weather StatementCTPLebanon, Schuylkill32 min
Sep 8, 2:17 AM EDTSpecial Weather StatementCTPNorthumberland28 min
Sep 8, 3:16 AM EDTSpecial Weather StatementCTPPerry59 min
Sep 8, 3:44 AM EDTSpecial Weather StatementCTPSchuylkill46 min
Sep 8, 4:01 AM EDTAreal Flood WarningCTPColumbia, Dauphin, Lycoming, Montour, Northumberland, Schuylkill and 4 more34 hr
Sep 8, 5:01 AM EDTAreal Flood WarningCTPAdams, Cumberland, Perry22 hr
Sep 8, 5:19 AM EDTSpecial Weather StatementCTPLancaster26 min
Sep 8, 5:57 AM EDTSpecial Weather StatementCTPLancaster63 min
Sep 8, 7:02 AM EDTSpecial Weather StatementCTPLancaster58 min
Sep 8, 7:46 AM EDTRiver Flood WarningCTPLycoming8 hr
Sep 8, 7:53 AM EDTSpecial Weather StatementCTPLancaster52 min
Sep 8, 9:22 AM EDTAreal Flood WarningCTPDauphin, Lancaster, Lebanon, York24 hr
Sep 8, 7:59 PM EDTFlash Flood WatchCTPAdams, Bedford, Blair, Cumberland, Franklin, Fulton and 5 more8 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.