Alert archive / Maryland / Flash Flood Warnings in 2013

Flash Flood Warning 10, NWS Philadelphia/Mount Holly

June 17, 2013Kent County, Maryland

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 17, 2013, 10:12 PM EDT for Kent 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: Jun 17, 2013, 10:12 PM EDT (02:12 UTC)
Expired: Jun 18, 2013, 2:15 AM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Kent County, MD

The radar

The Dover AFB radar (KDOX), 77 km from the middle of the area, began a volume at 02:12 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 17, 10:25 PM EDT	FLASH FLOOD	Kennedyville, MD	ONE ROAD IMPASSABLE DUE TO FLOODING... 1 TREE DOWN CAUSE UNKN VCNTY MD 561 AND 213. TIME APPROX.

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 00:00Z, 2.2 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: 218 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1832 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

274 
WGUS51 KPHI 180212
FFWPHI
MDC029-180615-
/O.NEW.KPHI.FF.W.0010.130618T0212Z-130618T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1012 PM EDT MON JUN 17 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL KENT COUNTY...

* UNTIL 215 AM EDT...

* AT 1004 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER CENTRAL KENT COUNTY.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RURAL AREAS
  OF CENTRAL KENT COUNTY.

DOPPLER RADAR INDICATED THAT OVER TWO INCHES OF RAIN HAD FALLEN IN 
THE PAST HOUR AND ADDITIONAL RAINFALL IS EXPECTED. EXCESSIVE RUNOFF 
FROM THESE THUNDERSTORMS WILL CAUSE FLOODING ALONG HIGHWAYS... 
STREETS AND UNDERPASSES AS WELL AS POOR DRAINAGE AREAS AND OTHER LOW 
LYING SPOTS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 3927 7623 3930 7619 3932 7619 3934 7617
      3931 7596 3924 7599 3924 7601 3922 7605
      3924 7622

$$

KRUZDLO

2 follow-up statements

347 
WGUS71 KPHI 180419
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1219 AM EDT TUE JUN 18 2013

MDC029-180615-
/O.CON.KPHI.FF.W.0010.000000T0000Z-130618T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KENT MD-
1219 AM EDT TUE JUN 18 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 215 AM EDT FOR
CENTRAL KENT COUNTY...

AT 1216 AM EDT...FLOODING WAS REPORTED ON MARYLAND 561 AND 213. 
FLOODING WAS ALSO REPORTED ON ROUTE 298. PORTIONS OF THESE ROADS ARE 
IMPASSABLE.

LAT...LON 3927 7623 3930 7619 3932 7619 3934 7617
      3931 7596 3924 7599 3924 7601 3922 7605
      3924 7622

$$

KRUZDLO

935 
WGUS71 KPHI 180608
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
208 AM EDT TUE JUN 18 2013

MDC029-180617-
/O.EXP.KPHI.FF.W.0010.000000T0000Z-130618T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KENT MD-
208 AM EDT TUE JUN 18 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 215 AM EDT FOR CENTRAL KENT
COUNTY...

THE HEAVY RAIN HAS MOVED OUT OF THE AREA. THEREFORE...THE FLASH 
FLOOD WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 3927 7623 3930 7619 3932 7619 3934 7617
      3931 7596 3924 7599 3924 7601 3922 7605
      3924 7622

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 8:16 PM EDT	Special Weather Statement	PHI	Cecil	119 min
Jun 17, 8:28 PM EDT	Areal Flood Advisory	PHI	Cecil	107 min
Jun 17, 9:37 PM EDT	Areal Flood Advisory	PHI	Kent, Queen Anne's	6 hr
Jun 17, 9:51 PM EDT	Special Weather Statement	PHI	Kent	114 min
Jun 17, 10:40 PM EDT	Special Weather Statement	PHI	Queen Anne's	50 min
Jun 18, 12:14 PM EDT	Areal Flood Advisory	PHI	Cecil	3 hr
Jun 18, 1:32 PM EDT	Areal Flood Advisory	PHI	Kent	3 hr
Jun 18, 2:29 PM EDT	Flash Flood Warning	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	3 hr
Jun 18, 4:23 PM EDT	Flash Flood Warning	PHI	Caroline	4 hr

Nearby

Flash Flood Warnings in Maryland, 2013 Every flash flood warning in 2013

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.