Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 74, NWS State College, PA

September 28, 2011Cumberland County, Dauphin County, Perry County, Pennsylvania

NWS State College, PA issued this flash flood warning at Sep 28, 2011, 2:21 PM EDT for Cumberland County, Dauphin County, Perry County, Pennsylvania. It was in force for 114 min. 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 28, 2011, 2:21 PM EDT (18:21 UTC)
Expired: Sep 28, 2011, 4:15 PM EDT
In force: 114 min
Issued by: NWS State College, PA
Area: Storm-based polygon
Flood severity: None

Counties Cumberland County, PA, Dauphin County, PA, Perry County, PA

The radar

The State College radar (KCCX), 118 km from the middle of the area, began a volume at 18:25 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

Time	Report	Where	Remark
Sep 28, 3:30 PM EDT	FLASH FLOOD	Harrisburg, PA	FLOODING ON CAMERON ST

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.4 hours before the alert went out and 114 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 822 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 526 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

459 
WGUS51 KCTP 281821
FFWCTP
PAC041-043-099-282015-
/O.NEW.KCTP.FF.W.0074.110928T1821Z-110928T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
221 PM EDT WED SEP 28 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN CUMBERLAND COUNTY...
  DAUPHIN COUNTY...
  EAST CENTRAL PERRY COUNTY...

* UNTIL 415 PM EDT...

* AT 215 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER DAUPHIN...EAST CENTRAL   
  PERRY AND NORTHEASTERN CUMBERLAND COUNTIES. UPWARDS OF 3 INCHES
  OF RAIN IS LIKELY IN LESS THAN 1 HOUR. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CAMP
  HILL...ENOLA...LEMOYNE...LOWER ALLEN...MECHANICSBURG...NEW
  CUMBERLAND...COLONIAL PARK...HARRISBURG...HERSHEY...HUMMELSTOWN...
  LINGLESTOWN...MIDDLETOWN...PROGRESS AND STEELTON.

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!

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

&&

LAT...LON 4054 7716 4054 7665 4049 7664 4048 7668
      4019 7658 4018 7677 4022 7684 4021 7689
      4022 7690 4020 7693 4019 7691 4018 7692
      4018 7702

$$

FORECASTER: MARTIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 27, 10:06 PM EDT	Areal Flood Advisory	CTP	Columbia, Lycoming, Montour, Northumberland, Schuylkill, Sullivan and 2 more	3 hr
Sep 28, 12:25 AM EDT	River Flood Warning	CTP	Huntingdon	3 hr
Sep 28, 12:58 AM EDT	Areal Flood Advisory	CTP	Columbia, Lycoming, Montour, Northumberland, Schuylkill, Snyder and 3 more	3 hr
Sep 28, 1:11 AM EDT	Areal Flood Advisory	CTP	Clearfield, Elk, McKean	3 hr
Sep 28, 1:15 AM EDT	Special Weather Statement	CTP	Elk	45 min
Sep 28, 1:16 AM EDT	River Flood Warning	CTP	Dauphin, Lebanon, Schuylkill	21 hr
Sep 28, 1:35 AM EDT	Special Weather Statement	CTP	Clearfield	40 min
Sep 28, 2:00 AM EDT	Special Weather Statement	CTP	McKean	60 min
Sep 28, 3:17 AM EDT	Special Weather Statement	CTP	Potter	28 min
Sep 28, 3:41 AM EDT	River Flood Warning	CTP	Dauphin, Lebanon	24 hr
Sep 28, 6:10 AM EDT	River Flood Warning	CTP	Dauphin	22 hr
Sep 28, 12:18 PM EDT	Areal Flood Advisory	CTP	Schuylkill	3 hr
Sep 28, 12:47 PM EDT	Areal Flood Advisory	CTP	Adams, Cumberland, York	3 hr
Sep 28, 1:36 PM EDT	Special Weather Statement	CTP	Dauphin	54 min
Sep 28, 2:06 PM EDT	Areal Flood Advisory	CTP	Cumberland, Dauphin, Lancaster, Perry, York	3 hr
Sep 28, 2:27 PM EDT	Special Weather Statement	CTP	Dauphin	63 min
Sep 28, 2:47 PM EDT	Areal Flood Advisory	CTP	Cameron, Centre, Clearfield, Clinton, McKean, Potter	3 hr
Sep 28, 2:55 PM EDT	Flash Flood Warning	CTP	Columbia, Dauphin, Lancaster, Lebanon, Northumberland, Schuylkill and 1 more	3 hr
Sep 28, 3:10 PM EDT	Special Weather Statement	CTP	Lebanon	50 min
Sep 28, 3:38 PM EDT	Flash Flood Warning	CTP	Columbia, Lycoming, Montour, Northumberland, Schuylkill, Snyder and 1 more	6 hr
Sep 28, 3:55 PM EDT	Special Weather Statement	CTP	Lycoming	65 min
Sep 28, 4:06 PM EDT	Flash Flood Warning	CTP	Columbia, Lycoming, Montour, Northumberland, Sullivan, Tioga	3 hr
Sep 28, 4:06 PM EDT	Special Weather Statement	CTP	Columbia	54 min
Sep 28, 4:12 PM EDT	Flash Flood Warning	CTP	Cumberland, Dauphin, Lancaster, Perry, York	3 hr
Sep 28, 4:38 PM EDT	Areal Flood Advisory	CTP	Bedford, Blair, Fulton, Huntingdon	3 hr
Sep 28, 4:40 PM EDT	Special Weather Statement	CTP	Dauphin	35 min
Sep 28, 5:27 PM EDT	Special Weather Statement	CTP	Carbon	63 min
Sep 28, 5:51 PM EDT	Special Weather Statement	CTP	Fulton	54 min
Sep 28, 6:57 PM EDT	Areal Flood Advisory	CTP	Clinton, Potter	2 hr
Sep 28, 7:14 PM EDT	River Flood Warning	CTP	Cumberland, York	9 hr
Sep 28, 7:27 PM EDT	Areal Flood Advisory	CTP	Fulton	2 hr
Sep 28, 7:57 PM EDT	Areal Flood Advisory	CTP	Franklin, Fulton, Huntingdon	3 hr

Nearby

Flash Flood Warnings in Pennsylvania, 2011 Every 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.