Alert archive / Delaware / Flash Flood Warnings in 2024
Flash Flood Warning 24, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 22, 2024, 7:44 PM EDT for Sussex County, Delaware. It was in force for 4 hr. 1 report 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
- Jul 22, 2024, 7:44 PM EDT (23:44 UTC)
- Expired
- Jul 22, 2024, 11:57 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), 29 km from the middle of the area, began a volume at 23:45 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 |
|---|---|---|---|
| Jul 22, 8:30 PM EDT | FLASH FLOOD | 1 Ese Millsboro, DE | Reports of high water on roadways within the Millsboro area. Time estimated from radar/information given from call center. |
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, 11.7 hours before the alert went out and 71 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
- 307 J/kg
- Mixed-layer CIN
- -63 J/kg
- Mixed-layer LCL
- 932 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
103
WGUS51 KPHI 222344
FFWPHI
DEC005-230445-
/O.NEW.KPHI.FF.W.0024.240722T2344Z-240723T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
744 PM EDT Mon Jul 22 2024
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Southwestern Sussex County in southern Delaware...
* Until 1245 AM EDT.
* At 744 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. The expected rainfall rate is 0.5 to 1.5 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.
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...
Georgetown, Millsboro, Laurel, Sycamore and Bethel.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 3846 7554 3846 7569 3858 7570 3859 7565
3867 7548 3868 7539 3869 7529 3862 7522
3859 7527 3846 7553
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...0.5-1.5 INCHES IN 1 HOUR
$$
Hoeflich2 follow-up statements
148
WGUS71 KPHI 230140
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
940 PM EDT Mon Jul 22 2024
DEC005-230445-
/O.CON.KPHI.FF.W.0024.000000T0000Z-240723T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex DE-
940 PM EDT Mon Jul 22 2024
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM EDT TUESDAY
FOR SOUTHWESTERN SUSSEX COUNTY...
At 940 PM EDT, local law enforcement reported thunderstorms that
produced heavy rain with flooding and high water around Millsboro.
Between 2.5 and 4 inches of rain have fallen. Flooding impacts will
continue, but no additional rainfall is expected. Flash flooding is
already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that may experience flash flooding include...
Georgetown, Millsboro, Laurel, Sycamore and Bethel.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 3846 7554 3846 7569 3858 7570 3859 7565
3867 7548 3868 7539 3869 7529 3862 7522
3859 7527 3846 7553
FLASH FLOOD...OBSERVED
$$
Hoeflich727
WGUS71 KPHI 230357
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1157 PM EDT Mon Jul 22 2024
DEC005-230407-
/O.CAN.KPHI.FF.W.0024.000000T0000Z-240723T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex DE-
1157 PM EDT Mon Jul 22 2024
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN SUSSEX COUNTY...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
&&
LAT...LON 3846 7554 3846 7569 3858 7570 3859 7565
3867 7548 3868 7539 3869 7529 3862 7522
3859 7527 3846 7553
$$
AKLThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 7:44 PM EDT | Tornado Warning | PHI | Sussex | 31 min |
Nearby
Flash Flood Warnings in Delaware, 2024Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.