Alert archive / Pennsylvania / Areal Flood Warnings in 2025

Areal Flood Warning 32, NWS Philadelphia/Mount Holly

July 7, 2025Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood warning at Jul 7, 2025, 5:38 PM EDT for Chester 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: Jul 7, 2025, 5:38 PM EDT (21:38 UTC)
Expired: Jul 7, 2025, 8:45 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Chester County, PA

The radar

The Philadelphia radar (KDIX), 114 km from the middle of the area, began a volume at 21:40 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 12:00Z, 9.6 hours before the alert went out and 182 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: 503 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 545 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Philadelphia/Mount Holly wrote its last area forecast discussion before this areal flood warning went out at Jul 7, 3:46 PM EDT, 1 hour 52 minutes earlier.

Area forecast discussion, Jul 7, 3:46 PM EDT, 1 hour 52 minutes before

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Hazardous weather outlook, Jul 7, 4:37 AM EDT, 13 hours 1 minute before

Hazardous Weather Outlook
National Weather Service Mount Holly NJ
437 AM EDT Mon Jul 7 2025

MDZ012-015-019-020-080845-
Kent MD-Queen Annes-Talbot-Caroline-
437 AM EDT Mon Jul 7 2025

...FLOOD WATCH IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS
EVENING...

This Hazardous Weather Outlook is for northeast Maryland.

.DAY ONE...Today and tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flood Watch.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Scattered severe thunderstorms will be capable of producing
locally damaging winds and instances of flash flooding Tuesday
afternoon and evening.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Local storm report, Jul 7, 2:42 PM EDT, 2 hours 56 minutes before

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Local storm report, Jul 7, 2:46 PM EDT, 2 hours 52 minutes before

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Local storm report, Jul 7, 2:47 PM EDT, 2 hours 51 minutes before

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Local storm report, Jul 7, 3:24 PM EDT, 2 hours 14 minutes before

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Local storm report, Jul 7, 4:08 PM EDT, 1 hour 30 minutes before

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Local storm report, Jul 7, 5:01 PM EDT, 37 minutes before

Preliminary Local Storm Report
National Weather Service Mount Holly NJ
501 PM EDT Mon Jul 7 2025

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

0400 PM     Flash Flood      1 SSW Lincoln Universit 39.78N 75.94W
07/07/2025                   Chester            PA   Trained Spotter

            Pictures of flooding of West Branch Big Elk
            Creek overflowing and spilling over to Old
            Creek Road and Oxford Road. Time given in
            report.

&&

Hoeflich

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 7, 2:06 AM EDT	Heat Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 8 more	42 hr
Jul 7, 2:16 AM EDT	Flood Watch	PHI	Burlington, Camden, Cumberland, Gloucester, Hunterdon, Mercer and 4 more	20 hr
Jul 7, 3:53 AM EDT	Rip Current Statement	PHI	Atlantic, Cape May, Ocean	40 hr
Jul 7, 2:01 PM EDT	Small Craft Advisory	PHI		20 hr
Jul 7, 3:07 PM EDT	Special Marine Warning	PHI		53 min
Jul 7, 1:39 PM EDT	Flash Flood Warning	PHI	Chester	4 hr

Nearby

Areal Flood Warnings in Pennsylvania, 2025 Every areal 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.