Alert archive / Pennsylvania / Flash Flood Warnings in 2024

Flash Flood Warning 20, NWS State College, PA

August 17, 2024Centre County, Huntingdon County, Pennsylvania

NWS State College, PA issued this flash flood warning at Aug 17, 2024, 8:47 PM EDT for Centre County, Huntingdon County, Pennsylvania. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 17, 2024, 8:47 PM EDT (00:47 UTC)
Expired: Aug 17, 2024, 11:45 PM EDT
In force: 3 hr
Issued by: NWS State College, PA
Area: Storm-based polygon
Flood severity: None

Counties Centre County, PA, Huntingdon County, PA

The radar

The State College radar (KCCX), 30 km from the middle of the area, began a volume at 00:51 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

Pittsburgh, PA (KPIT), launched 00:00Z, 0.8 hours before the alert went out and 188 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: 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

What forecasters said that day

The local office's own words before this flash flood warning 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 warning went out at Aug 17, 7:59 PM EDT, 48 minutes earlier.

Area forecast discussion, Aug 17, 7:59 PM EDT, 48 minutes before

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Hazardous weather outlook, Aug 17, 7:51 PM EDT, 56 minutes before

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In the hours before

Special weather statement, Aug 17, 6:42 PM EDT, 2 hours 5 minutes before

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Special weather statement, Aug 17, 7:06 PM EDT, 1 hour 41 minutes before

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Special weather statement, Aug 17, 7:29 PM EDT, 1 hour 18 minutes before

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Special weather statement, Aug 17, 7:30 PM EDT, 1 hour 17 minutes before

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Local storm report, Aug 17, 7:35 PM EDT, 1 hour 12 minutes before

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Local storm report, Aug 17, 7:52 PM EDT, 55 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 8:04 PM EDT	Flash Flood Warning	CTP	Blair, Centre, Huntingdon	3 hr
Aug 17, 8:28 PM EDT	Special Weather Statement	CTP	Mifflin	47 min
Aug 17, 8:34 PM EDT	Special Weather Statement	CTP	Potter	26 min
Aug 17, 8:57 PM EDT	Special Weather Statement	CTP	Clearfield	33 min
Aug 17, 8:57 PM EDT	Special Weather Statement	CTP	Potter	33 min
Aug 17, 9:21 PM EDT	Areal Flood Advisory	CTP	McKean, Potter	4 hr
Aug 17, 9:53 PM EDT	Special Weather Statement	CTP	Mifflin	37 min
Aug 17, 10:32 PM EDT	Areal Flood Advisory	CTP	Cameron, Centre, Clearfield, Clinton	4 hr
Aug 17, 10:58 PM EDT	Special Weather Statement	CTP	Mifflin	32 min
Aug 18, 1:24 AM EDT	Areal Flood Advisory	CTP	Clearfield	96 min
Aug 18, 2:02 AM EDT	Flash Flood Warning	CTP	Clearfield	118 min
Aug 18, 2:15 AM EDT	Areal Flood Advisory	CTP	Blair, Centre, Huntingdon	103 min
Aug 18, 2:45 AM EDT	Special Weather Statement	CTP	Centre	30 min
Aug 18, 3:07 AM EDT	Areal Flood Advisory	CTP	Cameron, Centre, Clinton, Elk, Lycoming, Potter and 1 more	3 hr
Aug 18, 5:33 AM EDT	Areal Flood Advisory	CTP	Tioga	117 min
Aug 18, 11:01 AM EDT	Areal Flood Advisory	CTP	Potter, Tioga	119 min
Aug 18, 1:29 PM EDT	Special Weather Statement	CTP	Dauphin	31 min
Aug 18, 1:42 PM EDT	Special Weather Statement	CTP	Snyder, Union	33 min
Aug 18, 2:00 PM EDT	Special Weather Statement	CTP	Schuylkill	30 min
Aug 18, 2:02 PM EDT	Special Weather Statement	CTP	Dauphin	28 min
Aug 18, 2:09 PM EDT	Severe Thunderstorm Warning	CTP	Dauphin, Northumberland, Perry, Snyder	51 min
Aug 18, 2:11 PM EDT	Special Weather Statement	CTP	Lycoming	34 min
Aug 18, 3:54 PM EDT	Special Weather Statement	CTP	Lebanon	36 min
Aug 18, 4:29 PM EDT	Areal Flood Advisory	CTP	Cumberland, Dauphin, York	91 min
Aug 18, 5:15 PM EDT	Special Weather Statement	CTP	Cumberland	30 min
Aug 18, 5:27 PM EDT	Special Weather Statement	CTP	Lancaster	33 min
Aug 18, 5:42 PM EDT	Special Weather Statement	CTP	Cumberland, Dauphin	33 min
Aug 18, 5:53 PM EDT	Areal Flood Advisory	CTP	Cumberland, Dauphin, York	112 min
Aug 18, 6:13 PM EDT	Special Weather Statement	CTP	Lancaster	32 min
Aug 18, 6:14 PM EDT	Special Weather Statement	CTP	Dauphin	31 min
Aug 18, 7:12 PM EDT	Special Weather Statement	CTP	Lancaster	33 min
Aug 18, 7:24 PM EDT	Special Weather Statement	CTP	Lancaster	21 min
Aug 18, 7:32 PM EDT	Severe Thunderstorm Warning	CTP	Lancaster	58 min
Aug 18, 7:54 PM EDT	Areal Flood Advisory	CTP	Lancaster	96 min

Nearby

Flash Flood Warnings in Pennsylvania, 2024 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.