Alert archive / Maryland / Flash Flood Warnings in 2016

Flash Flood Warning 19, NWS Philadelphia/Mount Holly

July 13, 2016Caroline County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 13, 2016, 2:34 PM EDT for Caroline County, Talbot County, Maryland. 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: Jul 13, 2016, 2:34 PM EDT (18:34 UTC)
Expired: Jul 13, 2016, 6:30 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Caroline County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 38 km from the middle of the area, began a volume at 18:37 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, 6.6 hours before the alert went out and 97 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: 361 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 789 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

546 
WGUS51 KPHI 131834
FFWPHI
MDC011-041-132230-
/O.NEW.KPHI.FF.W.0019.160713T1834Z-160713T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
234 PM EDT WED JUL 13 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN CAROLINE COUNTY IN EASTERN MARYLAND...
  EAST CENTRAL TALBOT COUNTY IN EASTERN MARYLAND...

* UNTIL 630 PM EDT
    
* AT 232 PM EDT...DOPPLER RADAR INDICATED A CLUSTER OF THUNDERSTORMS
  PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. UP TO FOUR INCHES OF
  RAIN HAVE FALLEN. BECAUSE THIS AMOUNT OF RAIN HAS FALLEN IN A SHORT
  PERIOD OF TIME, FLASH FLOODING IS LIKELY. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  FEDERALSBURG...PRESTON...MATTHEWS...TANYARD...HARMONY AND GRIFFIN. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. 

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

DRIVING INTO FLOOD WATERS COULD PUT YOUR LIFE AT RISK AND COST YOU
THOUSANDS OF DOLLARS IN VEHICLE REPAIRS. FLOOD WATERS MAY BE DEEPER
THAT YOU THINK.  TURN AROUND AND FIND AN ALTERNATE ROUTE.

&&

LAT...LON 3870 7580 3871 7584 3870 7590 3869 7592
      3880 7605 3889 7587 3869 7576 3868 7580

$$

KRUZDLO

2 follow-up statements

530 
WGUS71 KPHI 131959
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
359 PM EDT WED JUL 13 2016

MDC011-041-132230-
/O.CON.KPHI.FF.W.0019.000000T0000Z-160713T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAROLINE MD-TALBOT MD-
359 PM EDT WED JUL 13 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR
SOUTHWESTERN CAROLINE AND EAST CENTRAL TALBOT COUNTIES...

AT 357 PM EDT...ALTHOUGH THE THUNDERSTORMS RESPONSIBLE FOR THE
FLOODING HAVE MOVED OUT OF THE AREA, RUNOFF CONTINUES. FLOODING HAS
BEEN REPORTED IN BOTH PRESTON AND HARMONY WITH AT LEAST A FOOT OF
WATER ON AREA ROADS.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
FEDERALSBURG...PRESTON...MATTHEWS...TANYARD...HARMONY AND GRIFFIN. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3870 7580 3871 7584 3870 7590 3869 7592
      3880 7605 3889 7587 3869 7576 3868 7580

$$

KRUZDLO

839 
WGUS71 KPHI 132223
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
623 PM EDT WED JUL 13 2016

MDC011-041-132232-
/O.EXP.KPHI.FF.W.0019.000000T0000Z-160713T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CAROLINE MD-TALBOT MD-
623 PM EDT WED JUL 13 2016

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN CAROLINE AND EAST CENTRAL
TALBOT COUNTIES WILL EXPIRE AT 630 PM EDT...

FLOOD WATERS ARE RECEDING. PLEASE CONTINUE TO HEED ANY ROAD CLOSURES.

LAT...LON 3870 7580 3871 7584 3870 7590 3869 7592
      3880 7605 3889 7587 3869 7576 3868 7580

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 1:13 PM EDT	Areal Flood Advisory	PHI	Caroline, Queen Anne's, Talbot	4 hr
Jul 13, 2:16 PM EDT	Areal Flood Advisory	PHI	Caroline	4 hr
Jul 13, 2:44 PM EDT	Heat Advisory	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	29 hr
Jul 13, 3:02 PM EDT	Flash Flood Warning	PHI	Caroline	4 hr

Nearby

Flash Flood Warnings in Maryland, 2016 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.