Alert archive / Delaware / Flash Flood Warnings in 2017
Flash Flood Warning 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 19, 2017, 8:20 PM EDT for Sussex County, Delaware. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 19, 2017, 8:20 PM EDT (00:20 UTC)
- Expired
- Jun 19, 2017, 11:15 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Sussex County, DE
The radar
The Dover AFB radar (KDOX), 38 km from the middle of the area, began a volume at 00:24 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 nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 0.3 hours before the alert went out and 68 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
- 1394 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 1009 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 162 m²/s²
- 0-3 km storm-relative helicity
- 157 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 8.5
The text
As transmitted.
464
WGUS51 KPHI 200020
FFWPHI
DEC005-200315-
/O.NEW.KPHI.FF.W.0004.170620T0020Z-170620T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
820 PM EDT MON JUN 19 2017
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
Southeastern Sussex County in southern Delaware...
* Until 1115 PM EDT
* At 818 PM EDT#...Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Two inches of rain have already
fallen in the warned area. Additional training of thunderstorms
may result in another inch of rainfall. The additional rainfall
will likely lead to Flash flooding.
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 3846 7547 3869 7547 3870 7505 3845 7504
3846 7505 3845 7505
$$
MWG1 follow-up statement
635
WGUS71 KPHI 200303
FFSPHI
Flash Flood Statement
National Weather Service MOUNT HOLLY NJ
1103 PM EDT MON JUN 19 2017
DEC005-200311-
/O.CAN.KPHI.FF.W.0004.000000T0000Z-170620T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex DE-
1103 PM EDT MON JUN 19 2017
...THE FLASH FLOOD WARNING FOR SOUTHEASTERN SUSSEX COUNTY IS
CANCELLED...
The heavy rain has ended. Light rain will continue for a couple more
hours but flooding is no longer expected to pose a threat.
LAT...LON 3846 7547 3869 7547 3870 7505 3845 7504
3846 7505 3845 7505
$$
amcThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 8:12 PM EDT | Special Weather Statement | PHI | Sussex | 48 min |
| Jun 19, 8:24 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 36 min |
| Jun 19, 8:32 PM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 3 hr |
| Jun 19, 8:45 PM EDT | Special Weather Statement | PHI | Sussex | 30 min |
Nearby
Flash Flood Warnings in Delaware, 2017Every flash flood warning in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.