Alert archive / Pennsylvania / Flash Flood Warnings in 2011

Flash Flood Warning 6, NWS State College, PA

April 16, 2011Adams County, Pennsylvania

NWS State College, PA issued this flash flood warning at Apr 16, 2011, 10:13 PM EDT for Adams County, Pennsylvania. It was in force for 2 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: Apr 16, 2011, 10:13 PM EDT (02:13 UTC)
Expired: Apr 17, 2011, 12:15 AM EDT
In force: 2 hr
Issued by: NWS State College, PA
Area: Storm-based polygon
Flood severity: None

County Adams County, PA

The radar

The Sterling radar (KLWX), 110 km from the middle of the area, began a volume at 02:16 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, 2.2 hours before the alert went out and 111 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: 132 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 547 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 574 m²/s²
0-3 km storm-relative helicity: 593 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

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

659 
WGUS51 KCTP 170213
FFWCTP
PAC001-170415-
/O.NEW.KCTP.FF.W.0006.110417T0213Z-110417T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1013 PM EDT SAT APR 16 2011

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

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

* UNTIL 1215 AM EDT...

* AT 1007 PM EDT...HEAVY RAINFALL CAPABLE OF PRODUCING FLASH 
FLOODING CONTINUES 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 3995 7747 3996 7745 3999 7740 4003 7719
      4007 7714 4006 7710 4002 7706 4001 7701
      3992 7697 3989 7699 3986 7696 3983 7700
      3972 7700 3972 7746

$$

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, 8:02 PM EDT	Special Weather Statement	CTP	Columbia, Lebanon, Schuylkill	58 min
Apr 16, 8:05 PM EDT	Tornado Warning	CTP	Adams, York	25 min
Apr 16, 8:25 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Lancaster, Lebanon, York	65 min
Apr 16, 8:29 PM EDT	Tornado Warning	CTP	Lancaster, York	31 min
Apr 16, 8:51 PM EDT	Severe Thunderstorm Warning	CTP	Schuylkill	44 min
Apr 16, 9:40 PM EDT	Wind Advisory	CTP	Adams, Bedford, Blair, Cambria, Cameron, Centre and 27 more	22 hr
Apr 16, 10:02 PM EDT	River Flood Warning	CTP	Blair, Huntingdon	12 hr
Apr 16, 10:02 PM EDT	River Flood Warning	CTP	Blair, Huntingdon	3 hr
Apr 16, 10:02 PM EDT	River Flood Warning	CTP	Dauphin, Lebanon, Schuylkill	28 hr
Apr 16, 10:02 PM EDT	River Flood Warning	CTP	Dauphin, Lebanon	33 hr
Apr 17, 12:24 AM EDT	River Flood Warning	CTP	Dauphin	38 hr
Apr 17, 12:28 PM EDT	River Flood Warning	CTP	Lancaster, York	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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.