Alert archive / Delaware / Flash Flood Warnings in 2024

Flash Flood Warning 49, NWS Philadelphia/Mount Holly

August 8, 2024New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 8, 2024, 3:46 PM EDT for New Castle County, Delaware. It was in force for 7 hr. 18 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: Aug 8, 2024, 3:46 PM EDT (19:46 UTC)
Expired: Aug 8, 2024, 10:20 PM EDT
In force: 7 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County New Castle County, DE

The radar

The Dover AFB radar (KDOX), 89 km from the middle of the area, began a volume at 19:47 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
Aug 8, 4:45 PM EDT	FLOOD	2 S Eastburn Heights, DE	Flooding on Rt 4 in Ogletown and Brookbend.
Aug 8, 5:16 PM EDT	RAIN 5.15	2 Sw Glendale, DE	Mesonet station GW1337 BEAR.
Aug 8, 5:20 PM EDT	RAIN 2.42	2 Ene Glasgow, DE	Mesonet station AR962 Newark.
Aug 8, 5:45 PM EDT	FLASH FLOOD	Hockessin, DE	Trained spotter reports some streams and nearby roads are flooded. Some roads are flooded that typically do not flood in and around Hockessin Delaware.
Aug 8, 5:56 PM EDT	RAIN 5.55	2 Sw Glendale, DE	Mesonet station GW1337 BEAR.
Aug 8, 6:00 PM EDT	FLASH FLOOD	3 Nw Saint Georges, DE	Numerous vehicles stuck in flood waters between the communities of Kirkwood and Red Lion along with some water rescues. A trailer park was also being evacuated in the area. Time estimated.
Aug 8, 6:00 PM EDT	RAIN 2.87	2 Ene Glasgow, DE	Mesonet station AR962 Newark.
Aug 8, 6:45 PM EDT	FLASH FLOOD	1 Sse Eastburn Heights, DE	White Clay Creek and Newark reached minor flood stage.
Aug 8, 7:00 PM EDT	FLASH FLOOD	2 S Brookside, DE	The Christina River at Coochs Bridge reached minor flood stage.
Aug 8, 7:00 PM EDT	RAIN 3.02	Brookside, DE	CO-OP Observer station NEWD1 Brookside.
Aug 8, 7:45 PM EDT	RAIN 3.06	1 N Woodshade, DE	Mesonet station FW2774 Newark.
Aug 8, 7:47 PM EDT	RAIN 6.29	2 Sw Glendale, DE	Mesonet station GW1337 BEAR.
Aug 8, 7:50 PM EDT	RAIN 3	2 Ene Glasgow, DE	Mesonet station AR962 Newark.
Aug 8, 7:53 PM EDT	FLASH FLOOD	1 Wsw Eastburn Heights, DE	Video relayed via social media of roadway flooding on Capitol Trail between Wilmington and Newark. About 1 to 2 feet of water covering the road.
Aug 8, 8:25 PM EDT	FLASH FLOOD	2 Ne Brookside, DE	DelDOT reported several roads closed due to high water in New Castle County. These include, Old Ogletown Road, Stanton Christiana Road, McCoy Road, Old Porter Road, Mill Creek Road between Graves and Mendenhall, Upper Pike Creek from Linden Hill Road and Paper
Aug 8, 9:00 PM EDT	RAIN 3.66	Brookside, DE	CO-OP Observer station NEWD1 Brookside.
Aug 8, 9:30 PM EDT	RAIN 3.07	1 N Woodshade, DE	Mesonet station FW2774 Newark.
Aug 8, 9:38 PM EDT	RAIN 6.31	2 Sw Glendale, DE	Mesonet station GW1337 BEAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.8 hours before the alert went out and 166 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: 243 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 494 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 115 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

830 
WGUS51 KPHI 081946
FFWPHI
DEC003-082345-
/O.NEW.KPHI.FF.W.0049.240808T1946Z-240808T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
346 PM EDT Thu Aug 8 2024

The National Weather Service in Mount Holly has issued a

* Flash Flood Warning for...
  Western New Castle County in northern Delaware...

* Until 745 PM EDT.

* At 346 PM EDT, Doppler radar indicated showers and isolated 
  thunderstorms producing heavy rain across the warned area. Between 
  1 and 2.5 inches of rain have fallen. The expected rainfall rate 
  is 1.5 to 2.5 inches in 1 hour. 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, Newark, Middletown, Elsmere, Delaware City, Newport, 
  Bear, Saint Georges, Glasgow, Mount Pleasant, Stanton and Pike 
  Creek.

This includes Interstate 95 in Delaware between mile markers 2 and 
11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

&&

LAT...LON 3959 7577 3971 7576 3975 7575 3981 7568
      3982 7559 3975 7556 3966 7562 3959 7561
      3947 7560 3937 7556 3933 7567 3947 7574

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 1 HOUR

$$

Gorse

5 follow-up statements

930 
WGUS71 KPHI 082043
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
443 PM EDT Thu Aug 8 2024

DEC003-082345-
/O.CON.KPHI.FF.W.0049.000000T0000Z-240808T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-
443 PM EDT Thu Aug 8 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM EDT THIS 
EVENING FOR WESTERN NEW CASTLE COUNTY...

At 443 PM EDT, Doppler radar and automated rain gauges indicated 
showers and isolated thunderstorms producing very heavy rain across 
the warned area. Between 2 and 3 inches of rain have fallen. The 
expected rainfall rate is 1.5 to 2.5 inches in 1 hour. 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...
  Wilmington, Newark, Middletown, Elsmere, Delaware City, Newport, 
  Bear, Saint Georges, Glasgow, Mount Pleasant, Stanton and Pike 
  Creek.

This includes Interstate 95 in Delaware between mile markers 2 and 
11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

&&

LAT...LON 3959 7577 3971 7576 3975 7575 3981 7568
      3982 7559 3975 7556 3966 7562 3959 7561
      3947 7560 3937 7556 3933 7567 3947 7574

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 1 HOUR

$$

Gorse

527 
WGUS71 KPHI 082141
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
541 PM EDT Thu Aug 8 2024

DEC003-082345-
/O.CON.KPHI.FF.W.0049.000000T0000Z-240808T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-
541 PM EDT Thu Aug 8 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM EDT THIS 
EVENING FOR WESTERN NEW CASTLE COUNTY...

At 541 PM EDT, Doppler radar and automated rain gauges indicated 
showers and isolated thunderstorms producing very heavy rain across 
much of the warned area. Between 2.5 and 5 inches of rain have 
fallen with the heaviest rainfall in the Bear area. The expected 
rainfall rate is 1.5 to 2.5 inches in 1 hour. 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...
  Wilmington, Newark, Middletown, Elsmere, Delaware City, Newport, 
  Bear, Saint Georges, Glasgow, Mount Pleasant, Stanton and Pike 
  Creek.

This includes Interstate 95 in Delaware between mile markers 2 and 
11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

&&

LAT...LON 3959 7577 3971 7576 3975 7575 3981 7568
      3982 7559 3975 7556 3966 7562 3959 7561
      3947 7560 3937 7556 3933 7567 3947 7574

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 1 HOUR

$$

Gorse

807 
WGUS71 KPHI 082222
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
622 PM EDT Thu Aug 8 2024

DEC003-082345-
/O.CON.KPHI.FF.W.0049.000000T0000Z-240808T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-
622 PM EDT Thu Aug 8 2024

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM EDT THIS 
EVENING FOR WESTERN NEW CASTLE COUNTY...

At 622 PM EDT, emergency management reported showers and isolated 
thunderstorms producing very heavy rain. Numerous vehicles trapped 
in flood waters and a trailer park being evauated in Red Lion and 
Kirkwood. Between 2.5 and 6 inches of rain have fallen. The expected 
rainfall rate is 2 to 3 inches in 1 hour. Flash flooding is already 
occurring.

HAZARD...Life threatening flash flooding caused by thunderstorms.

SOURCE...Emergency management reported.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets, and underpasses.

Some locations that may experience flash flooding include...
  Wilmington, Newark, Middletown, Elsmere, Delaware City, Newport, 
  Bear, Saint Georges, Glasgow, Mount Pleasant, Stanton and Pike 
  Creek.

This includes Interstate 95 in Delaware between mile markers 2 and 
11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

&&

LAT...LON 3959 7577 3971 7576 3975 7575 3981 7568
      3982 7559 3975 7556 3966 7562 3959 7561
      3947 7560 3937 7556 3933 7567 3947 7574

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...2-3 INCHES IN 1 HOUR

$$

Gorse

594 
WGUS51 KPHI 082328
FFWPHI
DEC003-090245-
/O.EXT.KPHI.FF.W.0049.000000T0000Z-240809T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
728 PM EDT Thu Aug 8 2024

The National Weather Service in Mount Holly has extended the

* Flash Flood Warning for...
  Western New Castle County in northern Delaware...

* Until 1045 PM EDT.

* At 728 PM EDT, emergency management reported thunderstorms 
  producing heavy rain in Numerous vehicles trapped in flood waters 
  and a trailer park being evauated in Red Lion and Kirkwood. 
  Between 2.5 and 6 inches of rain have fallen. The expected 
  rainfall rate is 2 to 3 inches in 1 hour. Flash flooding is 
  already occurring.

  HAZARD...Life threatening flash flooding caused by
           thunderstorms.

  SOURCE...Emergency management reported.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets, and underpasses.

* Some locations that may experience flash flooding include...
  Wilmington, Newark, Middletown, Elsmere, Delaware City, Newport, 
  Bear, Saint Georges, Glasgow, Mount Pleasant, Stanton and Pike 
  Creek.

This includes Interstate 95 in Delaware between mile markers 2 and 
11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles.

&&

LAT...LON 3982 7559 3975 7556 3966 7562 3959 7561
      3947 7560 3937 7556 3933 7567 3947 7574
      3959 7577 3971 7576 3975 7575 3981 7568

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...2-3 INCHES IN 1 HOUR

$$

Robertson

180 
WGUS71 KPHI 090220
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1020 PM EDT Thu Aug 8 2024

DEC003-090230-
/O.CAN.KPHI.FF.W.0049.000000T0000Z-240809T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-
1020 PM EDT Thu Aug 8 2024

...FLASH FLOOD WARNING FOR WESTERN NEW CASTLE COUNTY HAS BEEN 
REPLACED WITH A FLOOD WARNING...

&&

LAT...LON 3982 7559 3975 7556 3966 7562 3959 7561
      3947 7560 3937 7556 3933 7567 3947 7574
      3959 7577 3971 7576 3975 7575 3981 7568

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 3:17 AM EDT	Rip Current Statement	PHI	Sussex	40 hr
Aug 8, 2:20 PM EDT	Coastal Flood Advisory	PHI	New Castle, Sussex	40 hr
Aug 8, 2:20 PM EDT	High Surf Advisory	PHI	Sussex	29 hr
Aug 8, 3:13 PM EDT	Wind Advisory	PHI	Kent, New Castle, Sussex	27 hr
Aug 8, 5:26 PM EDT	River Flood Warning	PHI	New Castle	14 hr
Aug 8, 5:26 PM EDT	River Flood Warning	PHI	New Castle	6 hr
Aug 8, 5:48 PM EDT	Flash Flood Warning	PHI	New Castle	6 hr
Aug 8, 6:04 PM EDT	Flood Watch	PHI	New Castle	24 hr
Aug 8, 6:59 PM EDT	Tornado Warning	PHI	New Castle	31 min

Nearby

Flash Flood Warnings in Delaware, 2024 Every 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.