Alert archive / Delaware / Flash Flood Warnings in 2018
Flash Flood Warning 12, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 9, 2018, 2:53 PM EDT for Sussex County, Delaware. It was in force for 4 hr. 1 report 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 9, 2018, 2:53 PM EDT (18:53 UTC)
- Expired
- Jun 9, 2018, 6:45 PM EDT
- In force
- 4 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), 18 km from the middle of the area, began a volume at 18:54 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 9, 3:30 PM EDT | FLASH FLOOD | Seaford, DE | 911 CENTER REPORTS SEVERALS CARS FLOODED IN WATER AND IMPASSABLE ROADS DUE TO FLOODING IN AND AROUND TOWN WITHIN THE LAST 1-2 HOURS |
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, 6.9 hours before the alert went out and 87 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
- 733 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 972 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
531
WGUS51 KPHI 091853
FFWPHI
DEC005-092245-
/O.NEW.KPHI.FF.W.0012.180609T1853Z-180609T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
253 PM EDT SAT JUN 9 2018
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
Western Sussex County in southern Delaware...
* Until 645 PM EDT.
* At 251 PM EDT, Doppler radar indicated thunderstorms moving slowly
east into western Sussex County. Rainfall rates between one and
two inches of rain per hour have been reported, and flash flooding
is expected in the heavier downpours.
* Some locations that could experience flooding include...
Georgetown, Milford, Seaford, Laurel, Bridgeville, Ellendale,
Sycamore, Blades, Greenwood and Bethel.
LAT...LON 3849 7569 3883 7572 3884 7555 3889 7551
3891 7541 3847 7541
$$
JJM2 follow-up statements
122 WGUS71 KPHI 092012 FFSPHI Flash Flood Statement National Weather Service Mount Holly NJ 412 PM EDT SAT JUN 9 2018 DEC005-092245- /O.CON.KPHI.FF.W.0012.000000T0000Z-180609T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex DE- 412 PM EDT SAT JUN 9 2018 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM EDT FOR SOUTHWESTERN SUSSEX COUNTY... At 411 PM EDT, Doppler radar indicated thunderstorms producing heavy rain continue across the warned area. Flash flooding is expected to continue through the afternoon hours. Some locations that could experience flooding include... Seaford, Laurel, Sycamore, Blades and Bethel. LAT...LON 3865 7570 3865 7541 3847 7541 3849 7569 $$ jjm
416 WGUS71 KPHI 092246 FFSPHI Flash Flood Statement National Weather Service Mount Holly NJ 646 PM EDT SAT JUN 9 2018 DEC005-092254- /O.EXP.KPHI.FF.W.0012.000000T0000Z-180609T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex DE- 646 PM EDT SAT JUN 9 2018 ...THE FLASH FLOOD WARNING FOR SOUTHWESTERN SUSSEX COUNTY WILL EXPIRE AT 645 PM EDT... The risk of life-threatening flash flooding has decreased since this afternoon. However, excessive runoff from the heavy rain that already fell and an additional one-half to one inch of rainfall that is expected early this evening will continue to cause areal flooding along creeks and streams and in poor drainage areas. A Flood Warning has been issued to cover this hazard. Please continue to heed any remaining road closures. LAT...LON 3865 7570 3865 7541 3847 7541 3849 7569 $$ JRK
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 12:51 PM EDT | Special Weather Statement | PHI | Sussex | 24 min |
| Jun 9, 1:04 PM EDT | Special Weather Statement | PHI | Kent | 56 min |
| Jun 9, 1:21 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 39 min |
| Jun 9, 1:25 PM EDT | Flash Flood Warning | PHI | Sussex | 4 hr |
| Jun 9, 1:35 PM EDT | Areal Flood Advisory | PHI | Kent | 71 min |
| Jun 9, 1:35 PM EDT | Special Weather Statement | PHI | Sussex | 25 min |
| Jun 9, 2:00 PM EDT | Special Weather Statement | PHI | Sussex | 30 min |
| Jun 9, 2:24 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 51 min |
| Jun 9, 2:42 PM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 58 min |
| Jun 9, 2:48 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 42 min |
| Jun 9, 3:06 PM EDT | Special Weather Statement | PHI | New Castle | 24 min |
| Jun 9, 3:26 PM EDT | Special Weather Statement | PHI | Sussex | 34 min |
| Jun 9, 3:45 PM EDT | Special Weather Statement | PHI | Kent | 45 min |
| Jun 9, 3:47 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 3 hr |
| Jun 9, 3:53 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 37 min |
| Jun 9, 4:06 PM EDT | Special Weather Statement | PHI | Sussex | 39 min |
| Jun 9, 4:15 PM EDT | Flash Flood Warning | PHI | Sussex | 3 hr |
| Jun 9, 4:20 PM EDT | Flash Flood Warning | PHI | Kent | 3 hr |
| Jun 9, 4:24 PM EDT | Special Weather Statement | PHI | Kent | 51 min |
| Jun 9, 5:31 PM EDT | Special Weather Statement | PHI | Sussex | 44 min |
| Jun 9, 5:44 PM EDT | Areal Flood Warning | PHI | Sussex | 4 hr |
| Jun 9, 6:44 PM EDT | Areal Flood Warning | PHI | Sussex | 3 hr |
Nearby
Flash Flood Warnings in Delaware, 2018Every flash 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.