Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 66, NWS State College, PA

September 27, 2011Clinton County, Pennsylvania

NWS State College, PA issued this flash flood warning at Sep 27, 2011, 8:37 AM EDT for Clinton County, Pennsylvania. It was in force for 4 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 27, 2011, 8:37 AM EDT (12:37 UTC)
Expired: Sep 27, 2011, 12:30 PM EDT
In force: 4 hr
Issued by: NWS State College, PA
Area: Storm-based polygon
Flood severity: None

County Clinton County, PA

The radar

The State College radar (KCCX), 43 km from the middle of the area, began a volume at 12:40 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

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 0.6 hours before the alert went out and 203 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: 687 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 788 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

281 
WGUS51 KCTP 271237
FFWCTP
PAC035-271430-
/O.NEW.KCTP.FF.W.0066.110927T1237Z-110927T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
837 AM EDT TUE SEP 27 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL CLINTON COUNTY...

* UNTIL 1030 AM EDT...

* AT 830 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER CENTRAL CLINTON COUNTY.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RURAL AREAS
  OF CENTRAL CLINTON COUNTY...INCLUDING RENOVO.

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 4134 7753 4113 7770 4117 7779 4118 7780
      4118 7781 4120 7787 4128 7791 4145 7775

$$

FORECASTER: CR

2 follow-up statements

819 
WGUS71 KCTP 271338
FFSCTP

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
938 AM EDT TUE SEP 27 2011

PAC035-271430-
/O.CON.KCTP.FF.W.0066.000000T0000Z-110927T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLINTON PA-
938 AM EDT TUE SEP 27 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 AM EDT FOR
CENTRAL CLINTON COUNTY...

AT 930 AM EDT...DOPPLER RADAR SHOWS ANOTHER AREA OF HEAVY RAINFALL 
ABOUT TO ENTER THE WARNED AREA. EXPECT RAINFALL CAPABLE OF PRODUCING 
FLASH FLOODING WITH THIS STORM. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HYNER...
RENOVO AND WESTPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 4134 7753 4113 7770 4117 7779 4118 7780
      4118 7781 4120 7787 4128 7791 4145 7775

$$

FORECASTER: CR

864 
WGUS51 KCTP 271424
FFWCTP
PAC035-271630-
/O.EXT.KCTP.FF.W.0066.000000T0000Z-110927T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1024 AM EDT TUE SEP 27 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  CENTRAL CLINTON COUNTY...

* UNTIL 1230 PM EDT...

* AT 1018 AM EDT...VERY HEAVY RAIN WAS OCCURRING OVER CENTRAL        
  CLINTON COUNTY AND FLASH FLOODING IS LIKELY OVER THE AREA. RADAR   
  ESTIMATES OVER THREE INCHES OF RAIN HAS ALREADY FALLEN IN THE      
  WARNED AREA WITH ANOTHER INCH POSSIBLE IN A SHORT AMOUNT OF TIME.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HYNER...
  RENOVO AND WESTPORT.

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 4134 7753 4113 7770 4117 7779 4118 7780
      4118 7781 4120 7787 4128 7791 4145 7775

$$

FORECASTER: CR

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 27, 4:03 AM EDT	Special Weather Statement	CTP	Somerset	42 min
Sep 27, 4:37 AM EDT	Severe Thunderstorm Warning	CTP	Bedford, Blair, Cambria, Somerset	53 min
Sep 27, 5:32 AM EDT	Special Weather Statement	CTP	Blair	43 min
Sep 27, 6:09 AM EDT	Special Weather Statement	CTP	Blair	36 min
Sep 27, 6:18 AM EDT	Areal Flood Advisory	CTP	Cumberland, Perry	3 hr
Sep 27, 6:21 AM EDT	Severe Thunderstorm Warning	CTP	Blair, Huntingdon	28 min
Sep 27, 7:32 AM EDT	Areal Flood Advisory	CTP	Adams, York	3 hr
Sep 27, 7:50 AM EDT	Special Weather Statement	CTP	Snyder	40 min
Sep 27, 7:59 AM EDT	Areal Flood Advisory	CTP	Snyder	3 hr
Sep 27, 8:12 AM EDT	Areal Flood Advisory	CTP	Clinton	3 hr
Sep 27, 8:35 AM EDT	Flash Flood Warning	CTP	Adams, York	115 min
Sep 27, 9:05 AM EDT	Areal Flood Advisory	CTP	Blair, Huntingdon	115 min
Sep 27, 9:12 AM EDT	Flash Flood Watch	CTP	Adams, Bedford, Blair, Cambria, Cameron, Centre and 27 more	40 hr
Sep 27, 9:53 AM EDT	Areal Flood Advisory	CTP	Centre, Huntingdon	112 min
Sep 27, 10:17 AM EDT	Special Weather Statement	CTP	Huntingdon, Mifflin	28 min
Sep 27, 10:19 AM EDT	Special Weather Statement	CTP	Centre	26 min
Sep 27, 10:39 AM EDT	Flash Flood Warning	CTP	Bedford, Centre, Cumberland, Franklin, Fulton, Huntingdon and 5 more	5 hr
Sep 27, 11:37 AM EDT	Special Weather Statement	CTP	Union	38 min
Sep 27, 1:03 PM EDT	Flash Flood Warning	CTP	Columbia, Lycoming, Montour, Northumberland, Snyder, Sullivan and 1 more	4 hr
Sep 27, 1:10 PM EDT	Flash Flood Warning	CTP	Franklin	2 hr
Sep 27, 2:36 PM EDT	Special Weather Statement	CTP	Franklin	54 min
Sep 27, 2:53 PM EDT	Flash Flood Warning	CTP	Adams, Cumberland, Franklin, York	2 hr
Sep 27, 3:31 PM EDT	Areal Flood Warning	CTP	Adams, Bedford, Centre, Cumberland, Dauphin, Franklin and 8 more	6 hr
Sep 27, 3:43 PM EDT	Flash Flood Warning	CTP	Cumberland, Dauphin, Lebanon, Northumberland, Schuylkill, York	3 hr
Sep 27, 3:56 PM EDT	Special Weather Statement	CTP	Dauphin, Northumberland	64 min
Sep 27, 4:13 PM EDT	Special Weather Statement	CTP	Fulton	62 min
Sep 27, 4:56 PM EDT	Flash Flood Warning	CTP	Columbia, Lebanon, Schuylkill	3 hr
Sep 27, 4:57 PM EDT	Areal Flood Warning	CTP	Montour, Northumberland, Snyder, Union	5 hr
Sep 27, 4:59 PM EDT	Special Weather Statement	CTP	Lebanon	61 min
Sep 27, 5:06 PM EDT	Areal Flood Advisory	CTP	Montour, Northumberland, Snyder, Union	4 hr
Sep 27, 5:14 PM EDT	Areal Flood Advisory	CTP	Columbia, Lycoming, Montour, Northumberland, Snyder, Sullivan and 1 more	4 hr
Sep 27, 5:32 PM EDT	River Flood Warning	CTP	Huntingdon	3 hr
Sep 27, 5:35 PM EDT	Special Weather Statement	CTP	Lebanon	55 min
Sep 27, 5:57 PM EDT	Special Weather Statement	CTP	Fulton	63 min
Sep 27, 6:33 PM EDT	Special Weather Statement	CTP	Lebanon	27 min
Sep 27, 7:05 PM EDT	Special Weather Statement	CTP	Lebanon, Schuylkill	25 min
Sep 27, 7:41 PM EDT	Special Weather Statement	CTP	Adams	34 min
Sep 27, 7:56 PM EDT	Flash Flood Warning	CTP	Columbia, Dauphin, Lebanon, Montour, Northumberland, Schuylkill	2 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.