Alert archive / Pennsylvania / Flash Flood Warnings in 2024

Flash Flood Warning 21, NWS State College, PA

August 18, 2024Clearfield County, Pennsylvania

NWS State College, PA issued this flash flood warning at Aug 18, 2024, 2:02 AM EDT for Clearfield County, Pennsylvania. It was in force for 118 min. 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
Aug 18, 2024, 2:02 AM EDT (06:02 UTC)
Expired
Aug 18, 2024, 4:00 AM EDT
In force
118 min
Issued by
NWS State College, PA
Area
Storm-based polygon
Flood severity
None

County Clearfield County, PA

The radar

The State College radar (KCCX), 35 km from the middle of the area, began a volume at 06:04 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
Aug 18, 3:00 AM EDTFLASH FLOODClearfield, PAWater across multiple roads in Clearfield.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 00:00Z, 6.0 hours before the alert went out and 173 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, Pittsburgh, PA at 00:00Z on 2024-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 363 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, Pittsburgh, PA at 00:00Z on 2024-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 144 square meters per square second.193958Sfc1 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
363 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
1314 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
144 m²/s²
0-3 km storm-relative helicity
196 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted.

291 
WGUS51 KCTP 180602
FFWCTP
PAC033-180800-
/O.NEW.KCTP.FF.W.0021.240818T0602Z-240818T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service State College PA
202 AM EDT Sun Aug 18 2024

The National Weather Service in State College has issued a

* Flash Flood Warning for...
  Central Clearfield County in central Pennsylvania...

* Until 400 AM EDT.

* At 202 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 2.5 inches of 
  rain have fallen. Additional rainfall amounts of 0.5 to 1.5 inches 
  are possible in the warned area. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Clearfield, Woodland, Curwensville, Hyde, Plymptonville, Lecontes 
  Mills, Grampian, Lumber City and Clearfield-Lawrence Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 4123 7827 4123 7824 4123 7818 4122 7809
      4118 7807 4083 7855 4093 7867 4123 7829

FLASH FLOOD...RADAR INDICATED

$$

Banghoff/Bauco
1 follow-up statement
178 
WGUS71 KCTP 180752
FFSCTP

Flash Flood Statement
National Weather Service State College PA
352 AM EDT Sun Aug 18 2024

PAC033-180802-
/O.EXP.KCTP.FF.W.0021.000000T0000Z-240818T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clearfield PA-
352 AM EDT Sun Aug 18 2024

...FLASH FLOOD WARNING WILL EXPIRE AT 4 AM EDT EARLY THIS MORNING 
FOR CENTRAL CLEARFIELD COUNTY...

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

A Flood Watch remains in effect until 1200 AM EDT Monday for a 
portion of central Pennsylvania.

&&

LAT...LON 4123 7827 4123 7824 4123 7818 4122 7809
      4118 7807 4083 7855 4093 7867 4123 7829

$$

Banghoff

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 8:04 PM EDTFlash Flood WarningCTPBlair, Centre, Huntingdon3 hr
Aug 17, 8:28 PM EDTSpecial Weather StatementCTPMifflin47 min
Aug 17, 8:34 PM EDTSpecial Weather StatementCTPPotter26 min
Aug 17, 8:47 PM EDTFlash Flood WarningCTPCentre, Huntingdon3 hr
Aug 17, 8:57 PM EDTSpecial Weather StatementCTPClearfield33 min
Aug 17, 8:57 PM EDTSpecial Weather StatementCTPPotter33 min
Aug 17, 9:21 PM EDTAreal Flood AdvisoryCTPMcKean, Potter4 hr
Aug 17, 9:53 PM EDTSpecial Weather StatementCTPMifflin37 min
Aug 17, 10:32 PM EDTAreal Flood AdvisoryCTPCameron, Centre, Clearfield, Clinton4 hr
Aug 17, 10:58 PM EDTSpecial Weather StatementCTPMifflin32 min
Aug 18, 1:24 AM EDTAreal Flood AdvisoryCTPClearfield96 min
Aug 18, 2:15 AM EDTAreal Flood AdvisoryCTPBlair, Centre, Huntingdon103 min
Aug 18, 2:45 AM EDTSpecial Weather StatementCTPCentre30 min
Aug 18, 3:07 AM EDTAreal Flood AdvisoryCTPCameron, Centre, Clinton, Elk, Lycoming, Potter and 1 more3 hr
Aug 18, 5:33 AM EDTAreal Flood AdvisoryCTPTioga117 min
Aug 18, 11:01 AM EDTAreal Flood AdvisoryCTPPotter, Tioga119 min
Aug 18, 1:29 PM EDTSpecial Weather StatementCTPDauphin31 min
Aug 18, 1:42 PM EDTSpecial Weather StatementCTPSnyder, Union33 min
Aug 18, 2:00 PM EDTSpecial Weather StatementCTPSchuylkill30 min
Aug 18, 2:02 PM EDTSpecial Weather StatementCTPDauphin28 min
Aug 18, 2:09 PM EDTSevere Thunderstorm WarningCTPDauphin, Northumberland, Perry, Snyder51 min
Aug 18, 2:11 PM EDTSpecial Weather StatementCTPLycoming34 min
Aug 18, 3:54 PM EDTSpecial Weather StatementCTPLebanon36 min
Aug 18, 4:29 PM EDTAreal Flood AdvisoryCTPCumberland, Dauphin, York91 min
Aug 18, 5:15 PM EDTSpecial Weather StatementCTPCumberland30 min
Aug 18, 5:27 PM EDTSpecial Weather StatementCTPLancaster33 min
Aug 18, 5:42 PM EDTSpecial Weather StatementCTPCumberland, Dauphin33 min
Aug 18, 5:53 PM EDTAreal Flood AdvisoryCTPCumberland, Dauphin, York112 min
Aug 18, 6:13 PM EDTSpecial Weather StatementCTPLancaster32 min
Aug 18, 6:14 PM EDTSpecial Weather StatementCTPDauphin31 min
Aug 18, 7:12 PM EDTSpecial Weather StatementCTPLancaster33 min
Aug 18, 7:24 PM EDTSpecial Weather StatementCTPLancaster21 min
Aug 18, 7:32 PM EDTSevere Thunderstorm WarningCTPLancaster58 min
Aug 18, 7:54 PM EDTAreal Flood AdvisoryCTPLancaster96 min

Nearby

Flash Flood Warnings in Pennsylvania, 2024Every flash flood warning in 2024

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.