Alert archive / Delaware / River Flood Warnings in 2021

River Flood Warning 9, NWS Philadelphia/Mount Holly

August 17, 2021New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this river flood warning at Aug 17, 2021, 2:06 PM EDT for New Castle County, Delaware. It took effect at Aug 17, 2021, 2:22 PM EDT. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Aug 17, 2021, 2:06 PM EDT (18:06 UTC)
In effect from
Aug 17, 2021, 2:22 PM EDT
Expired
Aug 17, 2021, 6:33 PM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
Moderate

County New Castle County, DE

The radar

The Dover AFB radar (KDOX), 95 km from the middle of the area, began a volume at 18:08 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 river

Written for the forecast point Christina River at Coochs Bridge (CHBD1). The gauge peaked at 11.68 ft at Aug 17, 2021, 4:00 PM EDT.

actionminormoderatemajor51008/1708/18
Action stage
9 ft
Minor stage
11 ft
Moderate stage
12 ft
Major stage
13 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01478000, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

The text

As transmitted.

742 
WGUS41 KPHI 171806
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
206 PM EDT Tue Aug 17 2021

...The National Weather Service in Mount Holly NJ has issued a Flood 
Warning for the following rivers in Delaware...

  Christina River At Coochs Bridge affecting New Castle County.

For the Christina River...including Coochs Bridge...Moderate 
flooding is forecast.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Motorists should not attempt to drive around barricades or drive 
cars through flooded areas.

Additional information is available at www.weather.gov/phi.


DEC003-180100-
/O.NEW.KPHI.FL.W.0009.210817T1822Z-210818T0100Z/
/CHBD1.2.ER.210817T1822Z.210817T1900Z.210817T2004Z.NO/
206 PM EDT Tue Aug 17 2021

The National Weather Service in Mount Holly has issued a

* Flood Warning for
  the Christina River At Coochs Bridge.
* Until this evening.
* At 1:16 PM EDT Tuesday the stage was 8.7 feet.
* Flood stage is 11.0 feet.
* Moderate flooding is forecast.
* Forecast...The river is expected to rise above flood stage this 
  afternoon, cresting near 12.3 feet. It should then fall back below 
  flood stage by this evening.
* Impact...At 9.0 feet, Flooding begins in fields and floodplain 
  adjacent to the river.
* Impact...At 11.0 feet, Flooding begins in the town of Christiana. 
  East Main Street (Del 7) begins to flood as does Water Street. 
  Meadow Road near New Castle Airport is subject to flooding. 
  Barksdale Road near Casho Mill Road is also subject to flooding as 
  are residential backyards.
* Impact...At 11.5 feet, Portions of Duross Heights near New Castle 
  Airport begin to flood including Don Avenue. Airport Road at the 
  New Castle Airport begins to flood as the Christina River backs up 
  the Nonesuch Creek. Walther Road in the Bear area also floods. 
  Flooding also occurs around Smalley's Pond Dam in Christiana.
* Impact...At 12.0 feet, Significant flooding occurs on Meadow Road 
  in Christiana. Roads are closed. Homes are flooded. Salem Church 
  Road and Reybold Road floods in Christiana also flood and are 
  subject to closures. Residential backyards can flood in this area. 
  Flooding also occurs in Newark on West Chestnut Hill Road and 
  South College Avenue.
* Flood History...This crest compares to a previous crest of 12.2 
  feet on 08/13/2004.

&&


               Fld   Observed           Forecast     
Location       Stg   Stg   Day/Time     Crest          

Christina River
Coochs Bridge  11.0  8.7   Tue 1 pm EDT 12.28 3pm  Tue          





&&

LAT...LON 3964 7578 3970 7578 3965 7570 3968 7565
      3968 7557 3959 7569

$$

Iovino
1 follow-up statement
209 
WGUS81 KPHI 172233
FLSPHI

Flood Statement
National Weather Service Mount Holly NJ
633 PM EDT Tue Aug 17 2021

...The Flood Warning is cancelled for the following rivers in 
Delaware...

  Christina River At Coochs Bridge affecting New Castle County.

DEC003-172345-
/O.CAN.KPHI.FL.W.0009.000000T0000Z-210817T2233Z/
/CHBD1.2.ER.210817T1822Z.210817T1900Z.210817T2004Z.NO/
633 PM EDT Tue Aug 17 2021

...The Flood Warning for the Christina River At Coochs Bridge has 
been cancelled...

The Flood Warning is cancelled for
  the Christina River At Coochs Bridge.
* At 6:15 PM EDT Tuesday the stage was 10.6 feet.
* Flood stage is 11.0 feet.
* Forecast...The river level is expected to continue falling.

&&


               Fld   Observed           Forecast     
Location       Stg   Stg   Day/Time     Crest          

Christina River
Coochs Bridge  11.0  10.6  Tue 6 pm EDT Crested          





&&

LAT...LON 3964 7578 3970 7578 3965 7570 3968 7565
      3968 7557 3959 7569

$$

Iovino

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 12:11 PM EDTAreal Flood AdvisoryPHINew Castle3 hr
Aug 17, 1:25 PM EDTAreal Flood AdvisoryPHIKent, New Castle3 hr
Aug 17, 1:31 PM EDTAreal Flood AdvisoryPHISussex3 hr
Aug 17, 1:46 PM EDTRiver Flood WarningPHINew Castle3 hr
Aug 17, 1:56 PM EDTFlash Flood WarningPHINew Castle4 hr
Aug 17, 2:49 PM EDTFlash Flood WarningPHIKent, New Castle91 min

Nearby

River Flood Warnings in Delaware, 2021Every river flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.