Alert archive / Delaware / Flash Flood Warnings in 2017

Flash Flood Warning 20, NWS Philadelphia/Mount Holly

July 14, 2017Kent County, Delaware; Caroline County, Maryland

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 14, 2017, 6:10 PM EDT for Kent County, Delaware; Caroline County, Maryland. 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: Jul 14, 2017, 6:10 PM EDT (22:10 UTC)
Expired: Jul 14, 2017, 9:15 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Kent County, DE, Caroline County, MD

The radar

The Dover AFB radar (KDOX), 24 km from the middle of the area, began a volume at 22:11 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 12:00Z, 10.2 hours before the alert went out and 116 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 908 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 959 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

792 
WGUS51 KPHI 142210
FFWPHI
DEC001-MDC011-150115-
/O.NEW.KPHI.FF.W.0020.170714T2210Z-170715T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
610 PM EDT FRI JUL 14 2017

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Kent County in central Delaware...
  Caroline County in eastern Maryland...

* Until 915 PM EDT

* At 608 PM EDT...Doppler radar indicated thunderstorms producing 
  heavy rain moving in from the west. Some of these thunderstorms 
  have a history of producing rain at the rate of two inches per 
  hour. Flash flooding is expected in the areas of heaviest rain as 
  these storms move through this evening. Be careful driving. 
  
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3871 7584 3868 7597 3873 7601 3881 7590
      3888 7595 3898 7594 3911 7584 3915 7575
      3929 7576 3929 7565 3937 7547 3927 7537
      3905 7537 3888 7524 3887 7526 3895 7532
      3896 7539 3884 7555 3883 7572 3864 7571

$$

jjm

1 follow-up statement

000 
WGUS71 KPHI 150030
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
830 PM EDT FRI JUL 14 2017

DEC001-MDC011-150040-
/O.CAN.KPHI.FF.W.0020.000000T0000Z-170715T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kent DE-Caroline MD-
830 PM EDT FRI JUL 14 2017

...THE FLASH FLOOD WARNING FOR KENT AND CAROLINE COUNTIES IS
CANCELLED...

The heavy rain has ended. Flash flooding is no longer a threat. 
Please continue to heed any remaining road closures.
A flood advisory has been issued until minor flooding issues, such 
as roadway flooding, abates.

LAT...LON 3871 7584 3868 7597 3873 7601 3881 7590
      3888 7595 3898 7594 3911 7584 3915 7575
      3929 7576 3929 7565 3937 7547 3927 7537
      3905 7537 3888 7524 3887 7526 3895 7532
      3896 7539 3884 7555 3883 7572 3864 7571

$$

jjm

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 13, 8:09 PM EDT	Special Weather Statement	PHI	Kent	36 min
Jul 13, 8:29 PM EDT	Special Weather Statement	PHI	Kent	31 min
Jul 13, 10:03 PM EDT	Special Weather Statement	PHI	Sussex	27 min
Jul 13, 10:15 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	4 hr
Jul 13, 10:39 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	51 min
Jul 14, 9:02 AM EDT	Special Weather Statement	PHI	New Castle	28 min
Jul 14, 11:40 AM EDT	Flash Flood Watch	PHI	Kent, New Castle	11 hr
Jul 14, 12:06 PM EDT	Heat Advisory	PHI	Kent, Sussex	7 hr
Jul 14, 2:14 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Jul 14, 2:31 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	59 min
Jul 14, 2:53 PM EDT	Flash Flood Warning	PHI	New Castle	3 hr
Jul 14, 3:18 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	12 min
Jul 14, 3:23 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	67 min
Jul 14, 3:25 PM EDT	Areal Flood Advisory	PHI	New Castle	4 hr
Jul 14, 3:34 PM EDT	Flash Flood Warning	PHI	New Castle	3 hr
Jul 14, 3:54 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	66 min
Jul 14, 5:14 PM EDT	Areal Flood Advisory	PHI	Kent	3 hr
Jul 14, 5:24 PM EDT	Special Weather Statement	PHI	Sussex	36 min
Jul 14, 5:30 PM EDT	River Flood Warning	PHI	New Castle	7 hr
Jul 14, 5:40 PM EDT	Severe Thunderstorm Warning	PHI	Kent	65 min
Jul 14, 5:51 PM EDT	Special Weather Statement	PHI	Sussex	39 min
Jul 14, 6:20 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	40 min
Jul 14, 6:32 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Jul 14, 6:48 PM EDT	Special Weather Statement	PHI	Sussex	42 min
Jul 14, 7:15 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	60 min
Jul 14, 9:23 AM EDT	Special Weather Statement	PHI	Cecil	37 min
Jul 14, 2:46 PM EDT	Areal Flood Advisory	PHI	Cecil	3 hr
Jul 14, 3:10 PM EDT	Flash Flood Warning	PHI	Cecil	2 hr
Jul 14, 3:52 PM EDT	Flash Flood Warning	PHI	Talbot	53 min
Jul 14, 3:57 PM EDT	Flash Flood Warning	PHI	Cecil, Kent	2 hr
Jul 14, 4:00 PM EDT	Special Weather Statement	PHI	Caroline	45 min
Jul 14, 4:05 PM EDT	Special Weather Statement	PHI	Kent	40 min
Jul 14, 4:48 PM EDT	Special Weather Statement	PHI	Queen Anne's	27 min
Jul 14, 4:59 PM EDT	Flash Flood Warning	PHI	Queen Anne's	4 hr
Jul 14, 5:27 PM EDT	Special Weather Statement	PHI	Queen Anne's	63 min
Jul 14, 5:54 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Talbot	51 min
Jul 14, 5:58 PM EDT	Flash Flood Warning	PHI	Talbot	3 hr

Nearby

Flash Flood Warnings in Delaware, 2017 Flash Flood Warnings in Maryland, 2017 Every 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.