Alert archive / Delaware / Flash Flood Warnings in 2015
Flash Flood Warning 43, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 4, 2015, 11:35 PM EDT for Sussex County, Delaware. It was in force for 4 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
- Aug 4, 2015, 11:35 PM EDT (03:35 UTC)
- Expired
- Aug 5, 2015, 3:30 AM 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), 35 km from the middle of the area, began a volume at 03:35 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, 3.6 hours before the alert went out and 70 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
- 961 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 1098 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
198
WGUS51 KPHI 050335
FFWPHI
DEC005-050730-
/O.NEW.KPHI.FF.W.0043.150805T0335Z-150805T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1135 PM EDT TUE AUG 4 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHWESTERN SUSSEX COUNTY IN SOUTHERN DELAWARE...
* UNTIL 330 AM EDT
* AT 1133 PM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO TO THREE INCHES OF
RAIN HAVE ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN
SHORTLY.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... LAUREL AND
BETHEL.
ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO INCHES ARE POSSIBLE IN THE
WARNED AREA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.
&&
LAT...LON 3858 7570 3859 7548 3848 7549 3847 7569
$$
ROBERTSON2 follow-up statements
027 WGUS71 KPHI 050435 FFSPHI FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1235 AM EDT WED AUG 5 2015 DEC005-050730- /O.CON.KPHI.FF.W.0043.000000T0000Z-150805T0730Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX DE- 1235 AM EDT WED AUG 5 2015 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM EDT FOR SOUTHWESTERN SUSSEX COUNTY... AT 1234 AM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. UP TO THREE TO FIVE INCHES OF RAIN HAVE ALREADY FALLEN. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... LAUREL AND BETHEL. ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO INCHES ARE POSSIBLE IN THE WARNED AREA. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. && LAT...LON 3858 7570 3859 7548 3848 7549 3847 7569 $$ ROBERTSON
251 WGUS71 KPHI 050636 FFSPHI FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 236 AM EDT WED AUG 5 2015 DEC005-050646- /O.CAN.KPHI.FF.W.0043.000000T0000Z-150805T0730Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX DE- 236 AM EDT WED AUG 5 2015 ...THE FLASH FLOOD WARNING FOR SOUTHWESTERN SUSSEX COUNTY IS CANCELLED... THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE A THREAT. LAT...LON 3858 7570 3859 7548 3848 7549 3847 7569 $$ ROBERTSON
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 9:01 PM EDT | Special Weather Statement | PHI | New Castle | 59 min |
| Aug 4, 10:24 PM EDT | Special Weather Statement | PHI | Sussex | 51 min |
| Aug 4, 11:06 PM EDT | Special Weather Statement | PHI | Sussex | 24 min |
| Aug 4, 11:18 PM EDT | Areal Flood Advisory | PHI | Sussex | 4 hr |
| Aug 4, 11:28 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 32 min |
| Aug 4, 11:43 PM EDT | Special Weather Statement | PHI | Sussex | 47 min |
| Aug 5, 12:04 AM EDT | Special Weather Statement | PHI | Sussex | 41 min |
| Aug 5, 12:39 AM EDT | Flash Flood Warning | PHI | Sussex | 4 hr |
| Aug 5, 12:52 AM EDT | Special Weather Statement | PHI | Sussex | 23 min |
Nearby
Flash Flood Warnings in Delaware, 2015Every flash flood warning in 2015
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.