Alert archive / Delaware / Flash Flood Warnings in 2020
Flash Flood Warning 58, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 12, 2020, 3:46 PM EDT for Caroline County, Maryland; Kent County, Sussex County, Delaware. It was in force for 3 hr. 3 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 12, 2020, 3:46 PM EDT (19:46 UTC)
- Expired
- Aug 12, 2020, 6:45 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Kent County, DE, Sussex County, DE, Caroline County, MD
The radar
The Dover AFB radar (KDOX), 15 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 12, 4:00 PM EDT | FLASH FLOOD | Harrington, DE | WATER RESCUE NEAR THE INTERSECTION OF LIBERTY STREET AND HOWARD DILL AVENUE. TIME BASED ON DISPATCH REPORT. |
| Aug 12, 4:00 PM EDT | HEAVY RAIN 2.12 | 1 E Harrington, DE | 2.12 INCHES OF RAIN WITHIN AN HOUR AT THE HARRINGTON DEOS STATION. |
| Aug 12, 4:10 PM EDT | HEAVY RAIN 3.06 | 1 Ese Frederica, DE | 3.06 INCHES OF RAIN WITHIN AN HOUR AT THE FREDERICA DEOS STATION. |
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, 7.8 hours before the alert went out and 99 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
- 1590 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 729 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
749
WGUS51 KPHI 121946
FFWPHI
DEC001-005-MDC011-122245-
/O.NEW.KPHI.FF.W.0058.200812T1946Z-200812T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
346 PM EDT Wed Aug 12 2020
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
Northwestern Sussex County in southern Delaware...
Southern Kent County in central Delaware...
Southeastern Caroline County in eastern Maryland...
* Until 645 PM EDT.
* At 345 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Over 2 inches of rain has
fallen so far. Flash flooding is expected.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
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 could experience flooding include...
Milford, Harrington, Milton, Bridgeville, Ellendale, Smithville,
Agner, Andrewsville, Felton, Greenwood, Frederica, Houston and
Farmington.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3871 7587 3901 7575 3900 7534 3874 7522
3867 7563
FLASH FLOOD...RADAR INDICATED
$$
JJMThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 12:43 PM EDT | Areal Flood Advisory | PHI | Cecil | 3 hr |
| Aug 12, 12:55 PM EDT | Areal Flood Advisory | PHI | Cecil, Kent | 3 hr |
| Aug 12, 3:06 PM EDT | Areal Flood Advisory | PHI | Caroline, Queen Anne's | 3 hr |
| Aug 12, 3:20 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 29 min |
| Aug 12, 3:36 PM EDT | Flash Flood Warning | PHI | Cecil | 108 min |
| Aug 12, 4:02 PM EDT | Special Weather Statement | PHI | Caroline | 28 min |
| Aug 12, 4:11 PM EDT | Areal Flood Warning | PHI | Caroline, Talbot | 3 hr |
| Aug 12, 4:43 PM EDT | Areal Flood Advisory | PHI | Cecil, Kent | 54 min |
| Aug 12, 12:55 PM EDT | Special Weather Statement | PHI | Kent | 35 min |
| Aug 12, 1:06 PM EDT | Flash Flood Warning | PHI | Kent, New Castle | 3 hr |
| Aug 12, 1:37 PM EDT | Areal Flood Advisory | PHI | New Castle | 3 hr |
| Aug 12, 1:54 PM EDT | Severe Thunderstorm Warning | PHI | New Castle | 51 min |
| Aug 12, 2:38 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 52 min |
| Aug 12, 2:40 PM EDT | Flash Flood Warning | PHI | New Castle | 3 hr |
| Aug 12, 3:15 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 45 min |
| Aug 12, 3:31 PM EDT | Flash Flood Warning | PHI | Kent | 3 hr |
| Aug 12, 4:00 PM EDT | Special Weather Statement | PHI | Kent | 30 min |
Nearby
Flash Flood Warnings in Delaware, 2020Flash Flood Warnings in Maryland, 2020Every flash flood warning in 2020
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.