Alert archive / Pennsylvania / Flash Flood Warnings in 2012

Flash Flood Warning 8, NWS State College, PA

June 1, 20124 counties in Pennsylvania

NWS State College, PA issued this flash flood warning at Jun 1, 2012, 9:17 PM EDT for 4 counties in Pennsylvania. It was in force for 5 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
Jun 1, 2012, 9:17 PM EDT (01:17 UTC)
Expired
Jun 2, 2012, 1:54 AM EDT
In force
5 hr
Issued by
NWS State College, PA
Area
Storm-based polygon
Flood severity
None

Counties Dauphin County, PA, Lancaster County, PA, Lebanon County, PA, York County, PA

The radar

The Dover AFB radar (KDOX), 141 km from the middle of the area, began a volume at 01:17 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, 1.3 hours before the alert went out and 154 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 2012-06-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 497 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2012-06-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 289 square meters per square second.19395878Sfc1 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
497 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
621 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
289 m²/s²
0-3 km storm-relative helicity
334 m²/s²
Significant tornado parameter
0.9
Supercell composite
6.1

Open this sounding in Storm Lab

The text

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

220 
WGUS51 KCTP 020117
FFWCTP
PAC043-071-075-133-020615-
/O.NEW.KCTP.FF.W.0008.120602T0117Z-120602T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
917 PM EDT FRI JUN 1 2012

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN DAUPHIN COUNTY...
  LANCASTER COUNTY...
  LEBANON COUNTY...
  YORK COUNTY...

* UNTIL 215 AM EDT...

* AT 912 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING FROM THUNDERSTORMS OVER LANCASTER...LEBANON...      
  SOUTHEASTERN DAUPHIN AND YORK COUNTIES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  DALLASTOWN...RED LION...SPRY...YORK...AKRON...COLUMBIA...EAST
  PETERSBURG...ELIZABETHTOWN...EPHRATA...LANCASTER...LEOLA...
  LITITZ...MANHEIM...MILLERSVILLE...MOUNT JOY...NEW HOLLAND...WILLOW
  STREET...ANNVILLE...CORNWALL...LEBANON AND MYERSTOWN.

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 7698 4051 7646 4037 7621 4014 7587
      4013 7588 4011 7593 4004 7593 3996 7599
      3987 7598 3985 7601 3983 7601 3979 7604
      3972 7610 3971 7624

$$

FORECASTER: CR/MD
1 follow-up statement
651 
WGUS71 KCTP 020554
FFSCTP

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
154 AM EDT SAT JUN 2 2012

PAC043-071-075-133-020604-
/O.CAN.KCTP.FF.W.0008.000000T0000Z-120602T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DAUPHIN PA-LANCASTER PA-LEBANON PA-YORK PA-
154 AM EDT SAT JUN 2 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR YORK...LEBANON...
LANCASTER AND SOUTHEASTERN DAUPHIN COUNTIES...

THE WATERS FROM THE EARLIER HEAVY RAINS ARE RECEDING AND FLOOD WATERS
NO LONGER POSE A THREAT TO LIFE OR PROPERTY. THEREFORE...THE FLASH
FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 3972 7698 4051 7646 4037 7621 4014 7587
      4013 7588 4011 7593 4004 7593 3996 7599
      3987 7598 3985 7601 3983 7601 3979 7604
      3972 7610 3971 7624

$$

FORECASTER: DANGELO

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 1, 8:30 PM EDTSpecial Weather StatementCTPLancaster30 min
Jun 1, 8:38 PM EDTSevere Thunderstorm WarningCTPColumbia, Lycoming, Sullivan, Tioga52 min
Jun 1, 8:47 PM EDTSevere Thunderstorm WarningCTPAdams, Clinton, Columbia, Cumberland, Dauphin, Juniata and 11 more58 min
Jun 1, 8:48 PM EDTSevere Thunderstorm WarningCTPLancaster, York57 min
Jun 1, 8:55 PM EDTAreal Flood AdvisoryCTPLancaster, Lebanon, York2 hr
Jun 1, 9:27 PM EDTAreal Flood AdvisoryCTPCentre, Clinton, Cumberland, Franklin, Huntingdon, Juniata and 5 more3 hr
Jun 1, 9:46 PM EDTSpecial Weather StatementCTPLebanon, Schuylkill29 min
Jun 1, 10:01 PM EDTSpecial Weather StatementCTPSullivan29 min

Nearby

Flash Flood Warnings in Pennsylvania, 2012Every flash flood warning in 2012

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.