Alert archive / Delaware / Flash Flood Warnings in 2025
Flash Flood Warning 25, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 30, 2025, 1:55 PM EDT for New Castle County, Delaware. 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 outline as issued.
The facts
- Issued
- Jun 30, 2025, 1:55 PM EDT (17:55 UTC)
- Expired
- Jun 30, 2025, 6:00 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County New Castle County, DE
The radar
The Philadelphia radar (KDIX), 104 km from the middle of the area, began a volume at 17:57 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, 5.9 hours before the alert went out and 179 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.
- Mixed-layer CAPE
- 781 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 983 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted.
350
WGUS51 KPHI 301755
FFWPHI
DEC003-302200-
/O.NEW.KPHI.FF.W.0025.250630T1755Z-250630T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
155 PM EDT Mon Jun 30 2025
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Northern New Castle County in northern Delaware...
* Until 600 PM EDT.
* At 155 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. The expected rainfall rate is 1 to 2 inches in 1
hour. 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...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
* Some locations that may experience flash flooding include...
Wilmington, Pennsville, Elsmere, New Castle, Newport, Arden,
Greenville, Talleyville, Stanton, Wilmington Manor, Ashland and
Hockessin.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 3979 7572 3981 7568 3984 7559 3983 7548
3981 7542 3977 7546 3972 7549 3969 7551
3967 7551 3969 7566 3972 7573 3975 7574
3976 7575
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
Hoeflich1 follow-up statement
533
WGUS71 KPHI 302152
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
552 PM EDT Mon Jun 30 2025
DEC003-302202-
/O.EXP.KPHI.FF.W.0025.000000T0000Z-250630T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-
552 PM EDT Mon Jun 30 2025
...FLASH FLOOD WARNING WILL EXPIRE AT 6 PM EDT THIS EVENING FOR
NORTHERN NEW CASTLE COUNTY...
The heavy rain has ended and flood waters have receded. Flooding is
no longer expected to pose a threat. Please continue to heed
remaining road closures.
&&
LAT...LON 3979 7572 3981 7568 3984 7559 3983 7548
3981 7542 3977 7546 3972 7549 3969 7551
3967 7551 3969 7566 3972 7573 3975 7574
3976 7575
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 3:19 AM EDT | Heat Advisory | PHI | New Castle | 13 hr |
| Jun 30, 1:16 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 44 min |
| Jun 30, 1:28 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 47 min |
| Jun 30, 1:34 PM EDT | Flash Flood Warning | PHI | Sussex | 3 hr |
| Jun 30, 3:52 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 38 min |
Nearby
Flash Flood Warnings in Delaware, 2025Every 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.