Alert archive / Maryland / Flash Flood Warnings in 2013

Flash Flood Warning 34, NWS Philadelphia/Mount Holly

July 12, 2013Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 12, 2013, 4:58 AM EDT for Queen Anne's 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: Jul 12, 2013, 4:58 AM EDT (08:58 UTC)
Expired: Jul 12, 2013, 9:00 AM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 78 km from the middle of the area, began a volume at 08:58 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
Jul 12, 5:45 AM EDT	FLASH FLOOD	Stevensville, MD	FLOODING ALONG ROUTE 8 JUST SOUTH OF STEVENSVILLE... FROM BATTS NECK ROAD SOUTHWARD... WITH ABOUT 4 INCHES OF WATER COVERING THE ROAD.

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, 9.0 hours before the alert went out and 93 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: 281 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1429 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: -19 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

486 
WGUS51 KPHI 120858
FFWPHI
MDC035-121300-
/O.NEW.KPHI.FF.W.0034.130712T0858Z-130712T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
458 AM EDT FRI JUL 12 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN QUEEN ANNE'S COUNTY...

* UNTIL 900 AM EDT...

* AT 450 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM THUNDERSTORMS OVER SOUTHWESTERN QUEEN ANNE'S
  COUNTY. TILGHMAN ISLAND TO BE SPECIFIC...WITH THE HEAVIEST RAIN OF
  PROBABLY OVER 3 INCHES SINCE 330 AM...OVER THE WESTERN PART OF THE
  ISLAND...NEAR AND WEST OF STEVENSVILLE.    

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CHESTER AND
  STEVENSVILLE.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. NEVER ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR IN AN
AUTOMOBILE. TURN AROUND DON'T DROWN!

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.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE 
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME 
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR 
CREEKS.

&&

LAT...LON 3900 7634 3904 7632 3904 7631 3903 7629
      3900 7628 3891 7631 3888 7633 3888 7637
      3894 7637

$$

FORECASTER:  DRAG

4 follow-up statements

534 
WGUS51 KPHI 120914 CCA
FFWPHI
MDC035-121300-
/O.COR.KPHI.FF.W.0034.130712T0858Z-130712T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
458 AM EDT FRI JUL 12 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN QUEEN ANNE'S COUNTY...

* UNTIL 900 AM EDT...

* AT 450 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
VERY HEAVY RAIN FROM THUNDERSTORMS OVER SOUTHWESTERN QUEEN ANNE'S 
COUNTY. THE HEAVIEST RAIN SO FAR...OF PROBABLY OVER 3 INCHES SINCE 
330 AM...HAS OCCURRED NEAR AND WEST OF STEVENSVILLE.    

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CHESTER AND
  STEVENSVILLE.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. NEVER ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR IN AN
AUTOMOBILE. TURN AROUND DON'T DROWN!

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.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE 
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME 
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR 
CREEKS.

&&

LAT...LON 3900 7634 3904 7632 3904 7631 3903 7629
      3900 7628 3891 7631 3888 7633 3888 7637
      3894 7637

$$

FORECASTER:  DRAG  

..THIS CORRECTS THE REFERENCE TO TILGHMAN ISLAND...

644 
WGUS71 KPHI 120957
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
557 AM EDT FRI JUL 12 2013

MDC035-121300-
/O.CON.KPHI.FF.W.0034.000000T0000Z-130712T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
QUEEN ANNE'S MD-
557 AM EDT FRI JUL 12 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 AM EDT FOR
SOUTHWESTERN QUEEN ANNE'S COUNTY...

AT 551 AM EDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED ROUTE 8 
UNDER WATER. THUNDERSTORMS WILL CONTINUE TO PRODUCING FLASH FLOODING 
OVER SOUTHWESTERN QUEEN ANNE'S COUNTY THROUGH AT LEAST 8 AM.

THIS IS A DANGEROUS FLOOD SITUATION FOR PORTIONS OF KENT ISLAND.  

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CHESTER...
ROMANCOKE AND STEVENSVILLE.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 3 INCHES ARE POSSIBLE. ISOLATED 
STORM TOTALS IN PARTS OF THE WARNING AREA BETWEEN 330 AM AND 9 AM 
MAY EXCEED 5 INCHES.  


PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.


FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF
RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE.

&&

LAT...LON 3900 7634 3904 7632 3904 7631 3903 7629
      3900 7628 3891 7631 3888 7633 3888 7637
      3894 7637

$$

FORECASTER: DRAG

264 
WGUS71 KPHI 121051
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
651 AM EDT FRI JUL 12 2013

MDC035-121300-
/O.CON.KPHI.FF.W.0034.000000T0000Z-130712T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
QUEEN ANNE'S MD-
651 AM EDT FRI JUL 12 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 AM EDT FOR
SOUTHWESTERN QUEEN ANNE'S COUNTY...

AT 646 AM EDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORT STRETCHES OF 
ROUTE 8 ON KENT ISLAND ARE UNDER ABOUT 4 INCHES OF WATER. HEAVY 
SHOWERS AND ISOLATED EMBEDDED THUNDERSTORMS WILL CONTINUE THROUGH 9 
AM. 

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 3 INCHES ARE POSSIBLE IN THE 
WARNED AREA WITH STORM TOTALS BETWEEN 330 AM AND 9 AM OF POSSIBLY 7
INCHES.

THIS IS STILL A DANGEROUS SITUATION FOR PORTIONS OF KENT ISLAND IN 
SOUTHWEST QUEEN ANNES COUNTY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...


DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3900 7634 3904 7632 3904 7631 3903 7629
      3900 7628 3891 7631 3888 7633 3888 7637
      3894 7637

$$

FORECASTER:  DRAG

022 
WGUS71 KPHI 121259
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
859 AM EDT FRI JUL 12 2013

MDC035-121306-
/O.EXP.KPHI.FF.W.0034.000000T0000Z-130712T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
QUEEN ANNE'S MD-
859 AM EDT FRI JUL 12 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 900 AM EDT FOR SOUTHWESTERN
QUEEN ANNE'S COUNTY...

COUNTY OFFICIALS STATED THAT ROUTE 8 ON KENT ISLAND HAS REOPENED, 
BUT RESIDUAL FLOODING REMAINS IN RESIDENTIAL NEIGHBORHOODS. SINCE 
THE CONDITIONS NO LONGER WARRANT A FLASH FLOOD WARNING, IT WILL BE 
REPLACED WITH AN ADVISORY. MORE RAIN IS EXPECTED THIS MORNING.

LAT...LON 3900 7634 3904 7632 3904 7631 3903 7629
      3900 7628 3891 7631 3888 7633 3888 7637
      3894 7637

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 3:51 AM EDT	Special Weather Statement	PHI	Anne Arundel	39 min
Jul 12, 4:08 AM EDT	Flash Flood Watch	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	17 hr
Jul 12, 4:27 AM EDT	Special Weather Statement	PHI	Anne Arundel	33 min
Jul 12, 5:41 AM EDT	Areal Flood Advisory	PHI	Kent, Queen Anne's, Talbot	8 hr
Jul 12, 7:15 AM EDT	Areal Flood Advisory	PHI	Caroline, Queen Anne's, Talbot	10 hr
Jul 12, 8:17 AM EDT	Special Weather Statement	PHI	Queen Anne's	43 min
Jul 12, 8:55 AM EDT	Flash Flood Warning	PHI	Caroline, Talbot	4 hr
Jul 12, 9:02 AM EDT	Areal Flood Advisory	PHI	Queen Anne's	4 hr
Jul 12, 10:49 AM EDT	Areal Flood Advisory	PHI	Cecil	4 hr
Jul 12, 12:15 PM EDT	Areal Flood Advisory	PHI	Cecil, Kent, Queen Anne's	14 hr
Jul 12, 1:28 PM EDT	Areal Flood Advisory	PHI	Kent, Queen Anne's, Talbot	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.