Alert archive / Pennsylvania / Flash Flood Warnings in 2021

Flash Flood Warning 1, NWS State College, PA

June 9, 2021Schuylkill County, Pennsylvania

NWS State College, PA issued this flash flood warning at Jun 9, 2021, 6:37 PM EDT for Schuylkill County, Pennsylvania. It was in force for 3 hr. 2 reports 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
Jun 9, 2021, 6:37 PM EDT (22:37 UTC)
Expired
Jun 9, 2021, 9:30 PM EDT
In force
3 hr
Issued by
NWS State College, PA
Area
Storm-based polygon
Flood severity
None

County Schuylkill County, PA

The radar

The Philadelphia radar (KDIX), 159 km from the middle of the area, began a volume at 22:39 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

TimeReportWhereRemark
Jun 9, 8:02 PM EDTHEAVY RAIN 4.03Orwigsburg, PA
Jun 9, 8:15 PM EDTFLASH FLOOD2 Nw Schuylkill Haven, PAROUTE 901 WASHED OUT IN NORTH MANHEIM TOWNSHIP (JUST NORTH OF CRESSONA).

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, 10.6 hours before the alert went out and 217 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 2021-06-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 193 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 12:00Z on 2021-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -75 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
193 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
1225 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-75 m²/s²
0-3 km storm-relative helicity
3 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

839 
WGUS51 KCTP 092237
FFWCTP
PAC107-100130-
/O.NEW.KCTP.FF.W.0001.210609T2237Z-210610T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service State College PA
637 PM EDT Wed Jun 9 2021

The National Weather Service in State College has issued a

* Flash Flood Warning for...
  Southeastern Schuylkill County in central Pennsylvania...

* Until 930 PM EDT.

* At 637 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain in Auburn and Schuylkill Haven. Between 2 and 4 inches 
  of rain have fallen. Flash flooding is ongoing or expected to 
  begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Pottsville, Schuylkill Haven, St. Clair, Orwigsburg, Port Carbon, 
  Friedensburg, Marlin, Renningers, Mechanicsville, McKeansburg, 
  Lake Wynonah, Cressona, Palo Alto, Auburn, Deer Lake, Cumbola, 
  Port Clinton, New Ringgold, Landingville and Mount Carbon.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Move to higher ground now. Act quickly to protect your life.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, urban areas, highways, streets and underpasses 
as well as other drainage areas and low lying spots.

&&

LAT...LON 4054 7614 4060 7625 4069 7623 4072 7604
      4068 7591 4067 7591 4064 7598 4057 7602
      4058 7604 4057 7605 4058 7606 4057 7608

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR 

$$

RG/MD
2 follow-up statements
285 
WGUS71 KCTP 092350
FFSCTP

Flash Flood Statement
National Weather Service State College PA
750 PM EDT Wed Jun 9 2021

PAC107-100130-
/O.CON.KCTP.FF.W.0001.000000T0000Z-210610T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Schuylkill PA-
750 PM EDT Wed Jun 9 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM EDT THIS 
EVENING FOR SOUTHEASTERN SCHUYLKILL COUNTY...

At 750 PM EDT, emergency management reported flash flooding across 
the warned area. Between 2 and 5 inches of rain have fallen. Flash 
flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Emergency management.

IMPACT...Flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other
         drainage and low lying areas.

Some locations that will experience flash flooding include...
  Pottsville, Schuylkill Haven, St. Clair, Orwigsburg, Port Carbon, 
  Friedensburg, Marlin, Renningers, Mechanicsville, McKeansburg, 
  Lake Wynonah, Cressona, Palo Alto, Auburn, Deer Lake, Cumbola, 
  Port Clinton, New Ringgold, Landingville and Mount Carbon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Move to higher ground now. Act quickly to protect your life.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, urban areas, highways, streets and underpasses 
as well as other drainage areas and low lying spots.

&&

LAT...LON 4054 7614 4060 7625 4069 7623 4072 7604
      4068 7591 4067 7591 4064 7598 4057 7602
      4058 7604 4057 7605 4058 7606 4057 7608

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...0.25 INCHES IN 1 HOUR 

$$

RG/MD
587 
WGUS71 KCTP 100122
FFSCTP

Flash Flood Statement
National Weather Service State College PA
922 PM EDT Wed Jun 9 2021

PAC107-100132-
/O.EXP.KCTP.FF.W.0001.000000T0000Z-210610T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Schuylkill PA-
922 PM EDT Wed Jun 9 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 930 PM EDT THIS EVENING FOR 
SOUTHEASTERN SCHUYLKILL COUNTY...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 4054 7614 4060 7625 4069 7623 4072 7604
      4068 7591 4067 7591 4064 7598 4057 7602
      4058 7604 4057 7605 4058 7606 4057 7608

$$

RG/MD

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 9, 1:37 PM EDTSpecial Weather StatementCTPTioga53 min
Jun 9, 2:04 PM EDTSevere Thunderstorm WarningCTPPotter26 min
Jun 9, 2:11 PM EDTSpecial Weather StatementCTPClearfield34 min
Jun 9, 2:18 PM EDTSpecial Weather StatementCTPElk27 min
Jun 9, 2:36 PM EDTSpecial Weather StatementCTPPotter24 min
Jun 9, 2:43 PM EDTSpecial Weather StatementCTPBlair32 min
Jun 9, 2:51 PM EDTSpecial Weather StatementCTPPotter24 min
Jun 9, 2:55 PM EDTSpecial Weather StatementCTPDauphin35 min
Jun 9, 2:59 PM EDTSpecial Weather StatementCTPCentre31 min
Jun 9, 3:03 PM EDTSpecial Weather StatementCTPHuntingdon27 min
Jun 9, 3:08 PM EDTSpecial Weather StatementCTPMcKean37 min
Jun 9, 3:14 PM EDTSpecial Weather StatementCTPCameron31 min
Jun 9, 3:27 PM EDTSpecial Weather StatementCTPDauphin33 min
Jun 9, 3:36 PM EDTSpecial Weather StatementCTPForest24 min
Jun 9, 3:52 PM EDTSpecial Weather StatementCTPMcKean23 min
Jun 9, 4:02 PM EDTSevere Thunderstorm WarningCTPMcKean, Warren28 min
Jun 9, 4:31 PM EDTSpecial Weather StatementCTPWarren59 min
Jun 9, 5:09 PM EDTSpecial Weather StatementCTPWarren66 min
Jun 9, 5:13 PM EDTSpecial Weather StatementCTPYork62 min
Jun 9, 5:35 PM EDTAreal Flood AdvisoryCTPCumberland, York85 min
Jun 9, 5:36 PM EDTSpecial Weather StatementCTPSchuylkill54 min
Jun 9, 5:46 PM EDTSevere Thunderstorm WarningCTPSchuylkill44 min
Jun 9, 6:00 PM EDTSpecial Weather StatementCTPAdams30 min
Jun 9, 6:14 PM EDTAreal Flood AdvisoryCTPSchuylkill23 min
Jun 9, 6:28 PM EDTSevere Thunderstorm WarningCTPSchuylkill62 min
Jun 9, 6:30 PM EDTSpecial Weather StatementCTPYork45 min
Jun 9, 6:38 PM EDTSpecial Weather StatementCTPLycoming52 min
Jun 9, 7:05 PM EDTSpecial Weather StatementCTPLancaster40 min
Jun 9, 7:09 PM EDTSevere Thunderstorm WarningCTPLancaster, York51 min
Jun 9, 7:54 PM EDTSpecial Weather StatementCTPLancaster36 min

Nearby

Flash Flood Warnings in Pennsylvania, 2021Every flash flood warning in 2021

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.