Alert archive / Pennsylvania / Flash Flood Warnings in 2024

Flash Flood Warning 27, NWS State College, PA

August 29, 2024Juniata County, Mifflin County, Pennsylvania

NWS State College, PA issued this flash flood warning at Aug 29, 2024, 10:27 PM EDT for Juniata County, Mifflin County, Pennsylvania. It was in force for 4 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 29, 2024, 10:27 PM EDT (02:27 UTC)
Expired: Aug 30, 2024, 2:00 AM EDT
In force: 4 hr
Issued by: NWS State College, PA
Area: Storm-based polygon
Flood severity: None

Counties Juniata County, PA, Mifflin County, PA

The radar

The State College radar (KCCX), 57 km from the middle of the area, began a volume at 02:29 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, 2.5 hours before the alert went out and 220 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: 1239 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1142 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 29, 7:41 PM EDT, 2 hours 46 minutes earlier.

Area forecast discussion, Aug 29, 7:41 PM EDT, 2 hours 46 minutes before

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Hazardous weather outlook, Aug 29, 8:53 PM EDT, 1 hour 34 minutes before

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In the hours before

Special weather statement, Aug 29, 9:12 PM EDT, 1 hour 15 minutes before

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Local storm report, Aug 29, 9:24 PM EDT, 1 hour 3 minutes before

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Local storm report, Aug 29, 9:55 PM EDT, 32 minutes before

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Local storm report, Aug 29, 9:58 PM EDT, 29 minutes before

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Local storm report, Aug 29, 10:09 PM EDT, 18 minutes before

Preliminary Local Storm Report
National Weather Service State College PA
1009 PM EDT Thu Aug 29 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0953 PM     Tstm Wnd Dmg     3 W Thompsontown        40.56N 77.29W
08/29/2024                   Juniata            PA   911 Call Center

            Multiple wires down onto roadways in the
            vicinity of Country Legend Drive.

&&

NPB

Local storm report, Aug 29, 10:19 PM EDT, 8 minutes before

Preliminary Local Storm Report
National Weather Service State College PA
1019 PM EDT Thu Aug 29 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0947 PM     Tstm Wnd Dmg     3 SSW Mcalisterville    40.59N 77.30W
08/29/2024                   Juniata            PA   911 Call Center

            Roof blown off of a residence with multiple
            wires down. Car trapped between two live
            wires on the roadway.

&&

NPB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 29, 8:05 PM EDT	Areal Flood Advisory	CTP	Sullivan	3 hr
Aug 29, 8:09 PM EDT	Areal Flood Advisory	CTP	Centre, Clinton	3 hr
Aug 29, 8:28 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Mifflin, Snyder, Union	47 min
Aug 29, 9:12 PM EDT	Special Weather Statement	CTP	Juniata	33 min
Aug 29, 9:42 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Perry	48 min
Aug 29, 10:12 PM EDT	Areal Flood Advisory	CTP	Centre, Huntingdon, Juniata, Mifflin	3 hr
Aug 29, 10:28 PM EDT	Special Weather Statement	CTP	Perry	32 min
Aug 29, 10:48 PM EDT	Flash Flood Warning	CTP	Juniata, Perry	3 hr
Aug 30, 12:58 AM EDT	Areal Flood Advisory	CTP	Juniata, Perry	92 min
Aug 30, 1:56 AM EDT	Areal Flood Warning	CTP	Juniata, Mifflin, Perry	64 min
Aug 30, 7:43 PM EDT	Special Weather Statement	CTP	Warren	17 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.