Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 1, NWS State College, PA

April 16, 2011Adams County, Pennsylvania

NWS State College, PA issued this flash flood warning at Apr 16, 2011, 4:50 PM EDT for Adams County, Pennsylvania. It was in force for 5 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: Apr 16, 2011, 4:50 PM EDT (20:50 UTC)
Expired: Apr 16, 2011, 10:15 PM EDT
In force: 5 hr
Issued by: NWS State College, PA
Area: Storm-based polygon
Flood severity: None

County Adams County, PA

The radar

The Sterling radar (KLWX), 108 km from the middle of the area, began a volume at 20:51 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
Apr 16, 5:25 PM EDT	FLASH FLOOD	Aspers, PA	OPOSSUM CREEK OUT OF BANKS

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, 8.8 hours before the alert went out and 109 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 533 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 473 m²/s²
0-3 km storm-relative helicity: 699 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.

350 
WGUS51 KCTP 162050
FFWCTP
PAC001-162345-
/O.NEW.KCTP.FF.W.0001.110416T2050Z-110416T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
450 PM EDT SAT APR 16 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

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

* UNTIL 745 PM EDT...

* AT 441 PM EDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH   
FLOODING FROM HEAVY RAINFALL OVER ADAMS COUNTY.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 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 3972 7746 3995 7747 3999 7740 4003 7719
      4007 7714 4006 7710 4002 7706 4001 7701
      3992 7697 3989 7699 3986 7695 3983 7700
      3972 7700

$$

FORECASTER: CR

1 follow-up statement

831 
WGUS51 KCTP 162340
FFWCTP
PAC001-170215-
/O.EXT.KCTP.FF.W.0001.000000T0000Z-110417T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
740 PM EDT SAT APR 16 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS EXTENDED THE

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

* UNTIL 1015 PM EDT...

* AT 732 PM EDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH   
FLOODING FROM HEAVY RAINFALL OVER ADAMS COUNTY.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 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 3972 7746 3995 7747 3999 7740 4003 7719
      4007 7714 4006 7710 4002 7706 4001 7701
      3992 7697 3989 7699 3986 7695 3983 7700
      3972 7700

$$

FORECASTER: CR

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 16, 2:52 PM EDT	Areal Flood Advisory	CTP	Bedford, Blair, Cambria, Centre, Clearfield, Fulton and 4 more	3 hr
Apr 16, 3:42 PM EDT	River Flood Warning	CTP	Huntingdon	27 hr
Apr 16, 3:53 PM EDT	Special Weather Statement	CTP	Adams	37 min
Apr 16, 4:01 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Dauphin, Franklin, Lancaster, Perry and 1 more	59 min
Apr 16, 4:39 PM EDT	Areal Flood Warning	CTP	Adams, Centre, Clinton, Columbia, Cumberland, Dauphin and 17 more	20 hr
Apr 16, 4:53 PM EDT	Severe Thunderstorm Warning	CTP	Cumberland, Franklin, Fulton, Perry	37 min
Apr 16, 5:24 PM EDT	Flash Flood Warning	CTP	Cumberland	5 hr
Apr 16, 5:38 PM EDT	Flash Flood Warning	CTP	Dauphin, Lancaster, Lebanon, York	7 hr
Apr 16, 5:59 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Cumberland, Franklin	46 min
Apr 16, 6:04 PM EDT	Flash Flood Warning	CTP	Franklin	5 hr
Apr 16, 6:27 PM EDT	River Flood Warning	CTP	Centre, Snyder, Union	8 hr
Apr 16, 6:27 PM EDT	River Flood Warning	CTP	Cumberland	50 hr
Apr 16, 6:27 PM EDT	River Flood Warning	CTP	Cumberland, York	44 hr
Apr 16, 6:31 PM EDT	Special Weather Statement	CTP	Dauphin	44 min
Apr 16, 6:46 PM EDT	Special Weather Statement	CTP	Adams, Lancaster, York	29 min
Apr 16, 7:21 PM EDT	Special Weather Statement	CTP	Dauphin	39 min
Apr 16, 7:27 PM EDT	Flash Flood Warning	CTP	Schuylkill	5 hr
Apr 16, 7:47 PM EDT	Severe Thunderstorm Warning	CTP	Adams, Dauphin, Lancaster, York	43 min
Apr 16, 7:52 PM EDT	River Flood Warning	CTP	Perry	19 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.