Alert archive / Delaware / Flash Flood Warnings in 2023

Flash Flood Warning 19, NWS Philadelphia/Mount Holly

June 26, 2023New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 26, 2023, 10:01 PM EDT for New Castle County, Delaware. It was in force for 4 hr. 11 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 26, 2023, 10:01 PM EDT (02:01 UTC)
Expired: Jun 27, 2023, 2:00 AM 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 Dover AFB radar (KDOX), 103 km from the middle of the area, began a volume at 02:02 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 26, 10:17 PM EDT	RAIN 1.03	New Castle County Airpo, DE	Wilmington/New Castle ASOS reported 1.03 inches of rain in 17 minutes.
Jun 26, 11:44 PM EDT	FLASH FLOOD	Claymont, DE	Spotter Network report of 20 vehicles stuck in flood water. Fire department is making water rescues.
Jun 26, 11:44 PM EDT	FLASH FLOOD	Claymont, DE	Spotter Network report of 20 vehicles stuck in flood water. Fire department is making water rescues.
Jun 26, 11:45 PM EDT	FLASH FLOOD	2 S Brookside, DE	The Christina River gauge at Coochs Bridge reached minor flood stage.
Jun 26, 11:45 PM EDT	FLASH FLOOD	2 S Brookside, DE	The Christina River gauge at Coochs Bridge reached minor flood stage.
Jun 26, 11:48 PM EDT	FLASH FLOOD	Edgemoor Terrace, DE	GOVERNOR PRINTZ BLVD FROM LEA BLVD TO EDGEMOOR RD IS CLOSED DUE TO FLOODING.
Jun 26, 11:55 PM EDT	FLOOD	Edgemoor, DE	Closed due to flooding in Wilmington on Governor Printz Blvd NB/SB between Edgemoor Rd and Lea Blvd. Time given in report.
Jun 26, 11:55 PM EDT	FLOOD	Edgemoor, DE	Closed due to flooding in Wilmington on Governor Printz Blvd NB/SB between Edgemoor Rd and Lea Blvd. Time given in report.
Jun 27, 12:00 AM EDT	FLASH FLOOD	1 Sse Eastburn Heights, DE	Th White Clay Creek gauge at Newark reached minor flood stage.
Jun 27, 12:00 AM EDT	FLASH FLOOD	1 Sse Eastburn Heights, DE	Th White Clay Creek gauge at Newark reached minor flood stage.
Jun 27, 12:47 AM EDT	FLASH FLOOD	2 Ne Brookside, DE	OLD OGLETOWN RD BETWEEN AUGUSTA DR AND 273 IS CLOSED DUE TO FLOODING.

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 00:00Z, 2.0 hours before the alert went out and 176 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: 1362 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1456 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

025 
WGUS51 KPHI 270201
FFWPHI
DEC003-270600-
/O.NEW.KPHI.FF.W.0019.230627T0201Z-230627T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1001 PM EDT Mon Jun 26 2023

The National Weather Service in Mount Holly has issued a

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

* Until 200 AM EDT.

* At 1001 PM EDT, Doppler radar and automated rain gauges 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 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...
  Wilmington, Newark, Pennsville, Carneys Point, Elsmere, New 
  Castle, Penns Grove, Newport, Arden, Stanton, Wilmington Manor, 
  and Pike Creek.

This includes the following highways...
	Interstate 95 in Delaware between mile markers 1 and 23.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3972 7579 3972 7577 3976 7575 3979 7572
      3983 7564 3984 7558 3983 7549 3980 7541
      3977 7546 3971 7548 3971 7549 3965 7556
      3952 7578

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR

$$

Staarmann

3 follow-up statements

498 
WGUS71 KPHI 270239
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1039 PM EDT Mon Jun 26 2023

DEC003-270600-
/O.CON.KPHI.FF.W.0019.000000T0000Z-230627T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-
1039 PM EDT Mon Jun 26 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM EDT TUESDAY FOR 
NORTHERN NEW CASTLE COUNTY...

At 1039 PM EDT, local law enforcement reported thunderstorms 
producing heavy rain across the warned area. Between 1.5 and 3 
inches of rain have fallen. The expected rainfall rate is 1 to 2 
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...Life threatening flash flooding caused by thunderstorms.

SOURCE...Law enforcement 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, Pennsville, Carneys Point, Elsmere, New 
  Castle, Penns Grove, Newport, Arden, Stanton, Wilmington Manor, 
  and Pike Creek.

This includes the following highways...
	Interstate 95 in Delaware between mile markers 1 and 22.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles. Be especially cautious at night when 
it is harder to recognize the dangers of flooding.

&&

LAT...LON 3972 7579 3972 7577 3976 7575 3979 7572
      3983 7564 3984 7558 3983 7549 3980 7541
      3977 7546 3971 7548 3971 7549 3965 7556
      3952 7578

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

$$

Staarmann

984 
WGUS71 KPHI 270408
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1208 AM EDT Tue Jun 27 2023

DEC003-270600-
/O.CON.KPHI.FF.W.0019.000000T0000Z-230627T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-
1208 AM EDT Tue Jun 27 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM EDT EARLY THIS 
MORNING FOR NORTHERN NEW CASTLE COUNTY...

At 1208 AM EDT, local law enforcement reported thunderstorms 
producing heavy rain across the warned area. Between 1.5 and 3 
inches of rain have fallen. Flash flooding is already occurring.

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

SOURCE...Law enforcement 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, Pennsville, Carneys Point, Elsmere, New 
  Castle, Penns Grove, Newport, Arden, Stanton, Wilmington Manor, 
  and Pike Creek.

This includes the following highways...
	Interstate 95 in Delaware between mile markers 1 and 22.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around...don't drown when encountering flooded roads. Most 
flood deaths occur in vehicles. Be especially cautious at night when 
it is harder to recognize the dangers of flooding.

&&

LAT...LON 3972 7579 3972 7577 3976 7575 3979 7572
      3983 7564 3984 7558 3983 7549 3980 7541
      3977 7546 3971 7548 3971 7549 3965 7556
      3952 7578

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Staarmann

722 
WGUS71 KPHI 270602
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
202 AM EDT Tue Jun 27 2023

DEC003-270612-
/O.EXP.KPHI.FF.W.0019.000000T0000Z-230627T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-
202 AM EDT Tue Jun 27 2023

...FLASH FLOOD WARNING HAS EXPIRED FOR NORTHERN NEW CASTLE COUNTY...

Flood waters have receded, however additional heavy rain overnight 
may result in additional areas of minor flooding.

A Flood Watch remains in effect until 300 AM EDT for portions of New 
Jersey...and southeast Pennsylvania.

LAT...LON 3972 7579 3972 7577 3976 7575 3979 7572
      3983 7564 3984 7558 3983 7549 3980 7541
      3977 7546 3971 7548 3971 7549 3965 7556
      3952 7578

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 9:19 PM EDT	Special Weather Statement	PHI	New Castle	26 min
Jun 26, 9:25 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	50 min
Jun 26, 9:51 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	54 min
Jun 26, 10:33 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	42 min
Jun 26, 10:46 PM EDT	River Flood Warning	PHI	New Castle	5 hr
Jun 26, 10:54 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Jun 26, 11:09 PM EDT	River Flood Warning	PHI	New Castle	2 hr
Jun 27, 2:09 AM EDT	Special Weather Statement	PHI	New Castle	21 min
Jun 27, 2:29 AM EDT	Special Weather Statement	PHI	New Castle	31 min
Jun 27, 2:37 AM EDT	Flash Flood Warning	PHI	New Castle	3 hr
Jun 27, 3:02 AM EDT	Flood Watch	PHI	New Castle	46 min
Jun 27, 3:48 AM EDT	Flood Watch	PHI	New Castle	17 hr
Jun 27, 3:05 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	40 min
Jun 27, 3:32 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	3 hr
Jun 27, 3:41 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	22 min
Jun 27, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Kent	37 min
Jun 27, 5:17 PM EDT	Flash Flood Warning	PHI	New Castle	4 hr
Jun 27, 6:18 PM EDT	Special Weather Statement	PHI	Kent	27 min

Nearby

Flash Flood Warnings in Delaware, 2023 Every flash flood warning in 2023

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.