Alert archive / Pennsylvania / Flash Flood Warnings in 2025

Flash Flood Warning 24, NWS State College, PA

June 10, 2025Adams County, Lancaster County, York County, Pennsylvania

NWS State College, PA issued this flash flood warning at Jun 10, 2025, 6:49 AM EDT for Adams County, Lancaster County, York 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: Jun 10, 2025, 6:49 AM EDT (10:49 UTC)
Expired: Jun 10, 2025, 10:00 AM EDT
In force: 3 hr
Issued by: NWS State College, PA
Area: Storm-based polygon
Flood severity: None

Counties Adams County, PA, Lancaster County, PA, York County, PA

The radar

The Sterling radar (KLWX), 126 km from the middle of the area, began a volume at 10:52 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 00:00Z, 10.8 hours before the alert went out and 125 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: 679 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1032 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.1

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 Jun 10, 5:37 AM EDT, 1 hour 12 minutes earlier.

Area forecast discussion, Jun 10, 5:37 AM EDT, 1 hour 12 minutes before

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Hazardous weather outlook, Jun 10, 4:17 AM EDT, 2 hours 32 minutes before

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In the hours before

Local storm report, Jun 10, 1:02 AM EDT, 5 hours 47 minutes before

Preliminary Local Storm Report
National Weather Service State College PA
102 AM EDT Tue Jun 10 2025

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

0820 PM     Tstm Wnd Dmg     Milesburg               40.94N 77.79W
06/09/2025                   Centre             PA   911 Call Center

            Multiple trees and wires down in the
            Milesburg area.

&&

NPB

Local storm report, Jun 10, 2:52 AM EDT, 3 hours 57 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
Jun 9, 8:11 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Clinton	49 min
Jun 9, 8:19 PM EDT	Flash Flood Warning	CTP	Bedford, Somerset	3 hr
Jun 9, 8:25 PM EDT	Tornado Warning	CTP	Centre, Clinton	35 min
Jun 9, 8:33 PM EDT	Severe Thunderstorm Warning	CTP	Huntingdon, Mifflin	42 min
Jun 9, 8:42 PM EDT	Tornado Warning	CTP	Centre, Huntingdon, Mifflin	33 min
Jun 9, 8:57 PM EDT	Severe Thunderstorm Warning	CTP	Clinton, Lycoming	48 min
Jun 9, 9:05 PM EDT	Severe Thunderstorm Warning	CTP	Bedford, Franklin, Fulton, Huntingdon	40 min
Jun 9, 9:11 PM EDT	Severe Thunderstorm Warning	CTP	Centre, Mifflin, Snyder, Union	49 min
Jun 9, 9:18 PM EDT	Severe Thunderstorm Warning	CTP	Juniata, Mifflin, Snyder	42 min
Jun 9, 9:28 PM EDT	Flash Flood Warning	CTP	Bedford	3 hr
Jun 9, 9:56 PM EDT	Severe Thunderstorm Warning Considerable damage threat	CTP	Mifflin, Snyder, Union	49 min
Jun 9, 10:04 PM EDT	Flash Flood Warning	CTP	Bedford, Fulton, Huntingdon	3 hr
Jun 9, 10:05 PM EDT	Severe Thunderstorm Warning	CTP	Huntingdon, Juniata, Mifflin	40 min
Jun 9, 10:13 PM EDT	Flash Flood Warning	CTP	Centre, Huntingdon, Mifflin	3 hr
Jun 9, 10:56 PM EDT	Flash Flood Warning	CTP	Mifflin, Snyder, Union	3 hr
Jun 10, 12:03 AM EDT	Flash Flood Warning	CTP	Juniata, Montour, Northumberland, Snyder, Union	3 hr
Jun 10, 1:40 AM EDT	Flash Flood Warning	CTP	Cumberland, Dauphin, Perry, York	3 hr
Jun 10, 7:44 AM EDT	Severe Thunderstorm Warning	CTP	Lancaster	31 min

Nearby

Flash Flood Warnings in Pennsylvania, 2025 Every flash flood warning in 2025

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.