Alert archive / Delaware / River Flood Warnings in 2018

River Flood Warning 82, NWS Philadelphia/Mount Holly

December 21, 2018New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this river flood warning at Dec 21, 2018, 3:55 AM EST for New Castle County, Delaware. It took effect at Dec 21, 2018, 4:50 AM EST. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Dec 21, 2018, 3:55 AM EST (08:55 UTC)
In effect from: Dec 21, 2018, 4:50 AM EST
Expired: Dec 21, 2018, 9:53 AM EST
In force: 5 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: Minor

County New Castle County, DE

The radar

The Dover AFB radar (KDOX), 102 km from the middle of the area, began a volume at 08:54 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 Red Clay Creek at Wooddale (RCCD1). The gauge peaked at 6.84 ft at Dec 21, 2018, 7:00 AM EST.

Action stage: 5.5 ft
Minor stage: 7 ft
Moderate stage: 8.5 ft
Major stage: 10 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 01480000, 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.

706 
WGUS41 KPHI 210855
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mt Holly NJ
355 AM EST Fri Dec 21 2018

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

  Red Clay Creek At Wooddale affecting New Castle County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...Do not attempt to drive through flooded areas. The water may be
deeper than you think.

&&

DEC003-211455-
/O.NEW.KPHI.FL.W.0082.181221T0950Z-181221T2328Z/
/RCCD1.1.ER.181221T0950Z.181221T1300Z.181221T1728Z.NO/
355 AM EST Fri Dec 21 2018

The National Weather Service in Mount Holly NJ has issued a 

* Flood Warning for 
  The Red Clay Creek at Wooddale.
* until this evening...Or until the warning is cancelled.
* At 2:46 AM Friday the stage was 5.9 feet.
* Flood stage is 7.0 feet.
* Minor flooding is forecast.
* Forecast...Rise above flood stage by early this morning and continue to rise 
  to near 7.8 feet by this morning.the river will fall below flood stage by this
  afternoon.
* Impact...At 5.5 feet...Flooding begins in adjacent open fields.
* Flood history...This crest compares to a previous crest of 5.9 feet on Sep 19 
  2003.  

 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG  DAY TIME      CREST

Red Clay Creek
  Wooddale               7.0    5.90  Fri 3 AM     7.8    Fri 8 AM 
 
&&
 
LAT...LON 3976 7568 3977 7559 3968 7557 3968 7565
                                      

$$

1 follow-up statement

673 
WGUS81 KPHI 211453
FLSPHI
Flood Statement
National Weather Service Mt Holly NJ
953 AM EST Fri Dec 21 2018

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

  Red Clay Creek At Wooddale affecting New Castle County

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SAFETY MESSAGE...Do not attempt to drive through flooded areas.
The water may be deeper than you think.

&&

DEC003-211523-
/O.CAN.KPHI.FL.W.0082.000000T0000Z-181221T2328Z/
/RCCD1.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.NO/
953 AM EST Fri Dec 21 2018

The Flood Warning is cancelled for
  The Red Clay Creek at Wooddale.
* At 8:46 AM Friday the stage was 6.6 feet.
* Flood stage is 7.0 feet.
* Forecast...The river crested below flood stage at 6.8 feet. 
  The river will continue to fall to 3.5 feet by tomorrow morning.
* Impact...At 7.5 feet...Barley Mill Road begins to flood. 
  Brandywine Springs Park floods.
* Flood history...This crest compares to a previous crest of 6.6 
  feet on Oct 27 2003.  
 
&&

                         FLD    OBSERVED           FORECAST
 LOCATION                STG    STG   DAY TIME     CREST

Red Clay Creek
  Wooddale               7.0    6.57  Fri 9 AM     5.9    Fri 10 AM
 
&&
 
LAT...LON 3976 7568 3977 7559 3968 7557 3968 7565
                                      

$$

Kruzdlo

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 21, 4:02 AM EST	Areal Flood Warning	PHI	New Castle	4 hr
Dec 21, 4:14 AM EST	River Flood Warning	PHI	New Castle	6 hr
Dec 21, 4:43 AM EST	Areal Flood Warning	PHI	Kent, New Castle, Sussex	8 hr
Dec 21, 5:02 AM EST	River Flood Warning	PHI	New Castle	5 hr
Dec 21, 8:04 AM EST	Areal Flood Warning	PHI	New Castle	7 hr

Nearby

River Flood Warnings in Delaware, 2018 Every river flood warning in 2018

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.