Alert archive / Delaware / Flash Flood Warnings in 2025
Flash Flood Warning 22, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 29, 2025, 4:12 PM EDT for Sussex County, Delaware. It was in force for 4 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 29, 2025, 4:12 PM EDT (20:12 UTC)
- Expired
- Jun 29, 2025, 8:15 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 34 km from the middle of the area, began a volume at 20:14 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 29, 5:20 PM EDT | FLASH FLOOD | Bethany Beach, DE | Social media video of multiple roads closed due to flooding at the intersection of Central Blvd and N Pennsylvania Ave. Time estimated from radar. |
| Jun 29, 6:00 PM EDT | FLOOD | Long Neck, DE | Several public reports of flooding received from around Long Neck. One photo via social media showed about 1 foot of standing water along a residential street. Time estimated. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.2 hours before the alert went out and 78 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
- 2444 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 829 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
155
WGUS51 KPHI 292012
FFWPHI
DEC005-300015-
/O.NEW.KPHI.FF.W.0022.250629T2012Z-250630T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
412 PM EDT Sun Jun 29 2025
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Southeastern Sussex County in southern Delaware...
* Until 815 PM EDT.
* At 412 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
0.5 and 2.5 inches of rain have fallen. The expected rainfall rate
is 1 to 3 inches in 1 hour. Additional rainfall amounts of 1 to 2
inches are possible in the warned area. Flash flooding is ongoing
or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
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...
Millsboro, Millville, Long Neck, Ocean View, South Bethany and
Dewey Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3870 7523 3872 7506 3861 7505 3849 7504
3848 7512 3856 7521 3858 7528 3863 7529
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-3 INCHES IN 1 HOUR
$$
Staarmann3 follow-up statements
270
WGUS71 KPHI 292102
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
502 PM EDT Sun Jun 29 2025
DEC005-300015-
/O.CON.KPHI.FF.W.0022.000000T0000Z-250630T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex DE-
502 PM EDT Sun Jun 29 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM EDT THIS
EVENING FOR SOUTHEASTERN SUSSEX COUNTY...
At 502 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between 1
and 3 inches of rain have fallen, with the greatest totals near
Indian River Bay and Indian River Inlet. The expected rainfall rate
is 1 to 2 inches in 1 hour. Additional rainfall amounts of 0.5 to 1
inch are possible in the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Millsboro, Millville, Long Neck, Ocean View, Indian River Inlet,
South Bethany and Dewey Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3870 7523 3872 7506 3861 7505 3849 7504
3848 7512 3856 7521 3858 7528 3863 7529
FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
Staarmann564
WGUS71 KPHI 292316
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
716 PM EDT Sun Jun 29 2025
DEC005-300015-
/O.CON.KPHI.FF.W.0022.000000T0000Z-250630T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex DE-
716 PM EDT Sun Jun 29 2025
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 815 PM EDT THIS
EVENING FOR SOUTHEASTERN SUSSEX COUNTY...
At 716 PM EDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between 1
and 3.5 inches of rain have fallen, with the greatest totals near
Indian River Bay and Indian River Inlet. Flash flooding is already
occurring in Bethany Beach.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
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...
Millsboro, Millville, Long Neck, Ocean View, Indian River Inlet,
Bethany Beach, South Bethany, and Dewey Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3870 7523 3872 7506 3861 7505 3849 7504
3848 7512 3856 7521 3858 7528 3863 7529
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
Staarmann606
WGUS71 KPHI 300006
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
806 PM EDT Sun Jun 29 2025
DEC005-300016-
/O.EXP.KPHI.FF.W.0022.000000T0000Z-250630T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex DE-
806 PM EDT Sun Jun 29 2025
...FLASH FLOOD WARNING WILL EXPIRE AT 815 PM EDT THIS EVENING FOR
SOUTHEASTERN SUSSEX COUNTY...
The heavy rain has ended and flood waters have receded. Flooding is
no longer expected to pose a threat. Please continue to heed
remaining road closures.
&&
LAT...LON 3870 7523 3872 7506 3861 7505 3849 7504
3848 7512 3856 7521 3858 7528 3863 7529
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 2:21 AM EDT | Severe Thunderstorm Warning | PHI | Kent | 26 min |
| Jun 29, 6:21 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 39 min |
| Jun 29, 6:52 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.