Alert archive / Delaware / Flash Flood Warnings in 2018
Flash Flood Warning 83, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 31, 2018, 12:15 PM EDT for Kent County, Sussex County, Delaware. It was in force for 7 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
- Aug 31, 2018, 12:15 PM EDT (16:15 UTC)
- Expired
- Aug 31, 2018, 7:15 PM EDT
- In force
- 7 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Kent County, DE, Sussex County, DE
The radar
The Dover AFB radar (KDOX), 10 km from the middle of the area, began a volume at 16:16 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 31, 1:00 PM EDT | FLASH FLOOD | Milford, DE | SEVERAL ROADWAYS AND INTERSECTIONS WERE CLOSED DUE TO FLOODING. |
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, 4.3 hours before the alert went out and 110 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
- 72 J/kg
- Mixed-layer CIN
- -177 J/kg
- Mixed-layer LCL
- 1245 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
771 WGUS51 KPHI 311615 FFWPHI DEC001-005-311915- /O.NEW.KPHI.FF.W.0083.180831T1615Z-180831T1915Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Mount Holly NJ 1215 PM EDT FRI AUG 31 2018 The National Weather Service in Mount Holly NJ has issued a * Flash Flood Warning for... North central Sussex County in southern Delaware... Southeastern Kent County in central Delaware... * Until 315 PM EDT. * At 1214 PM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between one and two inches of rain has been estimated by radar during the past hour...and additional rain is on the way. * Some locations that could experience flooding include... Milford, Harrington, Houston and Farmington. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. A Flash Flood Warning means that flooding is imminent or occurring. If you are in the warned area move to higher ground immediately. Residents living along streams and creeks should take immediate precautions to protect life and property. && LAT...LON 3898 7534 3886 7526 3881 7555 3895 7565 $$ jjm
2 follow-up statements
768 WGUS51 KPHI 311905 FFWPHI DEC001-005-312315- /O.EXT.KPHI.FF.W.0083.000000T0000Z-180831T2315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Mount Holly NJ 305 PM EDT FRI AUG 31 2018 The National Weather Service in Mount Holly NJ has extended the * Flash Flood Warning for... North central Sussex County in southern Delaware... Southeastern Kent County in central Delaware... * Until 715 PM EDT. * At 303 PM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Up to 3 to 5 inches of rain have fallen with earlier thunderstorms. Additional rainfall is moving into the area which is expected to lead to additional Flash flooding. * Some locations that could experience flooding include... Milford, Harrington, Houston and Farmington. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. A Flash Flood Warning means that flooding is imminent or occurring. If you are in the warned area move to higher ground immediately. Residents living along streams and creeks should take immediate precautions to protect life and property. && LAT...LON 3898 7534 3886 7526 3881 7555 3895 7565 $$ Robertson
225 WGUS71 KPHI 312308 FFSPHI Flash Flood Statement National Weather Service Mount Holly NJ 708 PM EDT FRI AUG 31 2018 DEC001-005-312315- /O.EXP.KPHI.FF.W.0083.000000T0000Z-180831T2315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex DE-Kent DE- 708 PM EDT FRI AUG 31 2018 ...THE FLASH FLOOD WARNING FOR NORTH CENTRAL SUSSEX AND SOUTHEASTERN KENT COUNTIES WILL EXPIRE AT 715 PM EDT... The heavy rain has ended. Flash Flooding is no longer expected to pose a threat, however, many local creeks and stream continue to run high and there continues to be some roadway flooding. An Areal Flood Warning will be issued for any residual flooding. There will continue to be scattered showers through this evening. Please continue to heed any remaining road closures. LAT...LON 3898 7534 3886 7526 3881 7555 3895 7565 $$ Robertson
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 1:37 AM EDT | Special Weather Statement | PHI | Sussex | 53 min |
| Aug 31, 10:57 AM EDT | Areal Flood Advisory | PHI | Kent | 107 min |
| Aug 31, 11:31 AM EDT | Flash Flood Warning | PHI | Kent | 11 hr |
| Aug 31, 11:53 AM EDT | Special Weather Statement | PHI | Kent | 37 min |
| Aug 31, 12:00 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 15 min |
| Aug 31, 12:28 PM EDT | Special Weather Statement | PHI | Kent | 32 min |
| Aug 31, 12:35 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 40 min |
| Aug 31, 12:54 PM EDT | Flash Flood Warning | PHI | Sussex | 4 hr |
| Aug 31, 1:09 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 51 min |
| Aug 31, 1:58 PM EDT | Special Weather Statement | PHI | Sussex | 32 min |
| Aug 31, 4:27 PM EDT | Special Weather Statement | PHI | Sussex | 18 min |
| Aug 31, 4:32 PM EDT | Flash Flood Warning | PHI | Sussex | 4 hr |
| Aug 31, 4:41 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle | 4 hr |
| Aug 31, 4:42 PM EDT | Special Weather Statement | PHI | Sussex | 33 min |
| Aug 31, 5:00 PM EDT | Flash Flood Warning | PHI | New Castle | 4 hr |
| Aug 31, 5:14 PM EDT | Special Weather Statement | PHI | Sussex | 46 min |
| Aug 31, 5:38 PM EDT | Areal Flood Advisory | PHI | Kent, New Castle, Sussex | 4 hr |
| Aug 31, 5:48 PM EDT | Flash Flood Warning | PHI | Sussex | 3 hr |
| Aug 31, 7:11 PM EDT | Areal Flood Warning | PHI | Kent, Sussex | 4 hr |
| Aug 31, 7:37 PM EDT | Flash Flood Warning | PHI | Kent, New Castle | 4 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.