Alert archive / Maryland / Flash Flood Warnings in 2016

Flash Flood Warning 35, NWS Philadelphia/Mount Holly

August 21, 2016Kent County, Sussex County, Delaware; Caroline County, Queen Anne's County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 21, 2016, 5:09 PM EDT for Kent County, Sussex County, Delaware; Caroline County, Queen Anne's County, Talbot County, Maryland. 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
Aug 21, 2016, 5:09 PM EDT (21:09 UTC)
Expired
Aug 21, 2016, 9:00 PM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Kent County, DE, Sussex County, DE, Caroline County, MD, Queen Anne's County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 58 km from the middle of the area, began a volume at 21:13 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

TimeReportWhereRemark
Aug 21, 5:15 PM EDTHEAVY RAIN 2.31Prospect Bay, MD

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.2 hours before the alert went out and 113 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2016-08-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 310 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2016-08-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
310 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
719 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted.

959 
WGUS51 KPHI 212109
FFWPHI
DEC001-005-MDC011-035-041-220100-
/O.NEW.KPHI.FF.W.0035.160821T2109Z-160822T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
509 PM EDT SUN AUG 21 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  KENT COUNTY IN CENTRAL DELAWARE...
  NORTHWESTERN SUSSEX COUNTY IN SOUTHERN DELAWARE...
  NORTHWESTERN TALBOT COUNTY IN EASTERN MARYLAND...
  SOUTHERN QUEEN ANNE'S COUNTY IN NORTHEASTERN MARYLAND...
  CAROLINE COUNTY IN EASTERN MARYLAND...

* UNTIL 900 PM EDT
    
* AT 502 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. ONE INCH OR LESS OF RAIN HAS
  FALLEN ALREADY. HOWEVER...A LINE OF THUNDERSTORMS IS QUICKLY
  FORMING OVER THE WARNED AREA. THESE STORMS WILL MOVE OVER THE SAME
  AREAS IN THE NEXT ONE TO TWO HOURS. FLASH FLOODING IS EXPECTED TO
  BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  DOVER...EASTON...TALBOT...SMYRNA...MILFORD...DENTON...HARRINGTON...
  CAMDEN...CLAYTON...GREENSBORO...OAKLAND...RIDGELY...CHESWOLD...
  ST. MICHAELS...BOWERS...GOLDSBORO...QUEEN ANNE...WOODSIDE...
  VIOLA AND HARTLY.

ADDITIONAL RAINFALL AMOUNTS OF TWO TO THREE INCHES ARE POSSIBLE IN
THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 3886 7626 3886 7625 3879 7622 3904 7631
      3900 7629 3897 7622 3908 7586 3914 7575
      3929 7576 3934 7544 3893 7529 3873 7613
      3871 7624 3876 7622 3872 7630 3877 7630
      3868 7635 3876 7638

$$

JRK
1 follow-up statement
383 
WGUS71 KPHI 212238
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
638 PM EDT SUN AUG 21 2016

DEC001-005-MDC011-035-041-212245-
/O.CAN.KPHI.FF.W.0035.000000T0000Z-160822T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KENT DE-SUSSEX DE-TALBOT MD-QUEEN ANNE'S MD-CAROLINE MD-
638 PM EDT SUN AUG 21 2016

...THE FLASH FLOOD WARNING FOR KENT...NORTHWESTERN SUSSEX...
NORTHWESTERN TALBOT...SOUTHERN QUEEN ANNE'S AND CAROLINE COUNTIES IS
CANCELLED...

THE HEAVY RAIN HAS ENDED...AND FLASH FLOODING IS NO LONGER EXPECTED
TO POSE A THREAT. A FLOOD ADVISORY WAS ISSUED FOR A MAJORITY OF THE
AREA THAT WAS PREVIOUSLY UNDER THE FLASH FLOOD WARNING WITH MINOR
FLOODING EXPECTED...ESPECIALLY IN AREAS OF POOR DRAINAGE.


LAT...LON 3886 7626 3886 7625 3879 7622 3904 7631
      3900 7629 3897 7622 3908 7586 3914 7575
      3929 7576 3934 7544 3893 7529 3873 7613
      3871 7624 3876 7622 3872 7630 3877 7630
      3868 7635 3876 7638

$$

JRK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 21, 2:51 PM EDTAreal Flood AdvisoryPHINew Castle114 min
Aug 21, 3:30 PM EDTAreal Flood AdvisoryPHIKent, New Castle2 hr
Aug 21, 3:47 PM EDTAreal Flood AdvisoryPHINew Castle118 min
Aug 21, 4:06 PM EDTSevere Thunderstorm WarningPHIKent39 min
Aug 21, 5:06 PM EDTSevere Thunderstorm WarningPHIKent39 min
Aug 21, 5:28 PM EDTSpecial Weather StatementPHIKent17 min
Aug 21, 5:46 PM EDTSpecial Weather StatementPHISussex14 min
Aug 21, 5:54 PM EDTSpecial Weather StatementPHISussex36 min
Aug 21, 6:31 PM EDTSpecial Weather StatementPHISussex29 min
Aug 21, 6:35 PM EDTAreal Flood AdvisoryPHIKent3 hr
Aug 21, 7:04 PM EDTSpecial Weather StatementPHISussex26 min
Aug 21, 2:38 PM EDTSpecial Weather StatementPHICecil22 min
Aug 21, 2:57 PM EDTSpecial Weather StatementPHIKent, Queen Anne's33 min
Aug 21, 3:40 PM EDTSpecial Weather StatementPHITalbot50 min
Aug 21, 3:50 PM EDTSpecial Weather StatementPHIKent25 min
Aug 21, 4:19 PM EDTSpecial Weather StatementPHITalbot26 min
Aug 21, 4:20 PM EDTFlash Flood WarningPHICecil, Kent, Queen Anne's4 hr
Aug 21, 4:29 PM EDTSpecial Weather StatementPHICaroline31 min
Aug 21, 4:50 PM EDTAreal Flood AdvisoryPHICaroline, Queen Anne's, Talbot3 hr
Aug 21, 4:54 PM EDTSpecial Weather StatementPHICaroline36 min

Nearby

Flash Flood Warnings in Maryland, 2016Flash Flood Warnings in Delaware, 2016Every flash flood warning in 2016

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.