Alert archive / Pennsylvania / Flash Flood Watches in 2011

Flash Flood Watch 7, NWS State College, PA

June 11, 20118 counties in Pennsylvania

NWS State College, PA issued this flash flood watch at Jun 11, 2011, 10:46 AM EDT for 8 counties in Pennsylvania. It took effect at Jun 11, 2011, 12:00 PM EDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued
Jun 11, 2011, 10:46 AM EDT (14:46 UTC)
In effect from
Jun 11, 2011, 12:00 PM EDT
Expired
Jun 12, 2011, 12:00 AM EDT
In force
12 hr
Issued by
NWS State College, PA
Flood severity
None

Counties Adams County, PA, Cumberland County, PA, Dauphin County, PA, Lancaster County, PA, Lebanon County, PA, Perry County, PA, Schuylkill County, PA, York County, PA

The radar

The State College radar (KCCX), 129 km from the middle of the area, began a volume at 14:47 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 12:00Z, 2.8 hours before the alert went out and 153 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 12:00Z on 2011-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 175 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2011-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 square meters per square second.1939Sfc1 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
175 J/kg
Mixed-layer CIN
-275 J/kg
Mixed-layer LCL
1552 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
153 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS State College, PA wrote its last area forecast discussion before this flash flood watch went out at Jun 11, 7:49 AM EDT, 2 hours 57 minutes earlier.

Area forecast discussion, Jun 11, 7:49 AM EDT, 2 hours 57 minutes before
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Hazardous weather outlook, Jun 11, 8:33 AM EDT, 2 hours 13 minutes before
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In the hours before

Special weather statement, Jun 11, 5:46 AM EDT, 5 hours before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
546 AM EDT SAT JUN 11 2011

PAZ051>053-057>059-066-111030-
COLUMBIA PA-DAUPHIN PA-LANCASTER PA-LEBANON PA-MONTOUR PA-
NORTHUMBERLAND PA-SCHUYLKILL PA-
546 AM EDT SAT JUN 11 2011

...A LINE OF STRONG THUNDERSTORMS WILL AFFECT COLUMBIA...EASTERN
DAUPHIN...EASTERN NORTHUMBERLAND...LEBANON...MONTOUR...NORTHERN
LANCASTER AND SCHUYLKILL COUNTIES...

AT 544 AM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
VALLEY VIEW TO LANDISVILLE...MOVING EAST AT 35 MPH.

EXPECT INTENSE LIGHTNING FROM THESE STORMS. DO NOT STAY IN THE OPEN
NOR SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS
WHEN A THUNDERSTORM APPROACHES. VERY HEAVY RAIN WILL FALL FROM THESE
STORMS...AND WILL CAUSE WATER TO POND ON ROADS AND FILL POOR DRAINAGE
AREAS. THE RAIN WILL CAUSE RAPID RISES ON SMALL STREAMS AND CREEKS.
THESE STORMS WILL BE NEAR MOUNT CARMEL AROUND 550 AM...MINERSVILLE
AROUND 600 AM...POTTSVILLE AROUND 610 AM...ORWIGSBURG AROUND 620 AM
AND CHURCHTOWN AROUND 630 AM.

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 253 AND 295...I-78 BETWEEN
MILE MARKERS 0 AND 8...I-80 BETWEEN MILE MARKERS 217 AND 247...I-81
BETWEEN MILE MARKERS 78 AND 139.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...STATE HIGHWAY
283...ROUTE 11...ROUTE 22...ROUTE 30...ROUTE 209...ROUTE 222...ROUTE
322...ROUTE 422...STATE ROAD 61...STATE ROAD 309...STATE ROAD 501.

LAT...LON 4064 7598 4057 7601 4051 7625 4049 7643
      4014 7587 4011 7593 4003 7594 4002 7651
      4005 7654 4007 7667 4107 7679 4115 7628
      4114 7623 4096 7621 4091 7605 4091 7599
      4075 7577 4073 7576

FORECASTER: CERU/GARTNER

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 11, 1:14 AM EDTSpecial Weather StatementCTPHuntingdon31 min
Jun 11, 2:39 AM EDTSpecial Weather StatementCTPLebanon36 min
Jun 11, 3:22 AM EDTAreal Flood AdvisoryCTPCentre, Clearfield3 hr
Jun 11, 3:31 AM EDTAreal Flood AdvisoryCTPDauphin, Lancaster, Lebanon, Perry, Schuylkill3 hr
Jun 11, 4:33 AM EDTSpecial Weather StatementCTPDauphin, Lebanon42 min
Jun 11, 5:46 AM EDTSpecial Weather StatementCTPColumbia, Lancaster, Lebanon, Montour, Northumberland, Schuylkill44 min
Jun 11, 6:44 AM EDTRiver Flood WarningCTPDauphin, Lebanon, Schuylkill8 hr
Jun 11, 6:44 AM EDTRiver Flood WarningCTPDauphin, Lebanon8 hr
Jun 11, 3:51 PM EDTSpecial Weather StatementCTPBlair54 min
Jun 11, 4:31 PM EDTSpecial Weather StatementCTPHuntingdon59 min
Jun 11, 4:37 PM EDTSpecial Weather StatementCTPClearfield68 min
Jun 11, 4:42 PM EDTSpecial Weather StatementCTPHuntingdon, Mifflin63 min
Jun 11, 5:36 PM EDTSpecial Weather StatementCTPFranklin54 min
Jun 11, 5:46 PM EDTSpecial Weather StatementCTPFulton44 min
Jun 11, 6:02 PM EDTSpecial Weather StatementCTPSullivan43 min
Jun 11, 6:28 PM EDTSpecial Weather StatementCTPHuntingdon62 min
Jun 11, 6:41 PM EDTFlash Flood WarningCTPDauphin, Lebanon, Northumberland, Schuylkill5 hr
Jun 11, 6:44 PM EDTSevere Thunderstorm WarningCTPDauphin, Lebanon61 min
Jun 11, 6:53 PM EDTSpecial Weather StatementCTPLycoming22 min
Jun 11, 6:58 PM EDTTornado WarningCTPLebanon47 min
Jun 11, 7:07 PM EDTSpecial Weather StatementCTPTioga23 min
Jun 11, 7:15 PM EDTTornado WarningCTPDauphin, Lebanon45 min
Jun 11, 7:42 PM EDTSevere Thunderstorm WarningCTPDauphin, Lancaster, Lebanon, York63 min
Jun 11, 7:42 PM EDTTornado WarningCTPLancaster, Lebanon48 min
Jun 11, 7:49 PM EDTTornado WarningCTPLancaster, Lebanon41 min
Jun 11, 7:52 PM EDTSevere Thunderstorm WarningCTPLancaster, York68 min
Jun 11, 7:53 PM EDTFlash Flood WarningCTPLancaster, Lebanon3 hr
Jun 11, 7:56 PM EDTTornado WarningCTPLancaster, York49 min

Nearby

Flash Flood Watches in Pennsylvania, 2011Every flash flood watch 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.