Alert archive / Maryland / Flash Flood Warnings in 2012

Flash Flood Warning 15, NWS Philadelphia/Mount Holly

June 22, 2012Salem County, New Jersey; Cecil County, Kent County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 22, 2012, 8:15 PM EDT for Salem County, New Jersey; Cecil County, Kent County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware. It was in force for 53 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jun 22, 2012, 8:15 PM EDT (00:15 UTC)
Expired
Jun 22, 2012, 9:08 PM EDT
In force
53 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Kent County, DE, New Castle County, DE, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 61 km from the middle of the area, began a volume at 00:18 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 00:00Z, 0.3 hours before the alert went out and 160 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, Wallops Is Stn, VA at 00:00Z on 2012-06-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1073 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, Wallops Is Stn, VA at 00:00Z on 2012-06-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.193958Sfc1 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
1073 J/kg
Mixed-layer CIN
-98 J/kg
Mixed-layer LCL
1341 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
12 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The text

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

737 
WGUS51 KPHI 230015
FFWPHI
DEC001-003-MDC015-029-035-NJC033-230215-
/O.NEW.KPHI.FF.W.0015.120623T0015Z-120623T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
815 PM EDT FRI JUN 22 2012

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN NEW CASTLE COUNTY...
  SOUTHEASTERN CECIL COUNTY...
  NORTHEASTERN KENT COUNTY...
  NORTHERN KENT COUNTY...
  NORTHEASTERN QUEEN ANNE'S COUNTY...
  SOUTHWESTERN SALEM COUNTY...

* UNTIL 1015 PM EDT...

* AT 813 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM THUNDERSTORMS OVER NORTHEASTERN KENT...
  NORTHEASTERN QUEEN ANNE'S...NORTHERN KENT...SOUTHEASTERN CECIL...
  SOUTHERN NEW CASTLE AND SOUTHWESTERN SALEM COUNTIES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CHESWOLD...
  CLAYTON...MIDDLETOWN...SMYRNA...CECILTON...MILLINGTON...
  SUDLERSVILLE...DELANEY CORNER...GREEN SPRING...WOODLAND BEACH...
  BOHEMIAS MILLS...MASSEY...SASSAFRAS...WARWICK AND HANCOCKS BRIDGE.

UP TO THREE INCHES OF QUICK FALLING RAIN IS POSSIBLE IN THE WARNED
AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT FLOODING...HAIL OR WIND DAMAGE TO THE NATIONAL WEATHER
SERVICE BY CALLING TOLL FREE...1-877-633-6772.

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 3947 7590 3950 7556 3946 7558 3942 7553
      3945 7551 3946 7555 3950 7555 3952 7544
      3938 7542 3944 7550 3942 7553 3937 7551
      3932 7543 3926 7539 3922 7539 3918 7590

$$

KRUZDLO
1 follow-up statement
794 
WGUS71 KPHI 230108
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
908 PM EDT FRI JUN 22 2012

DEC001-003-MDC015-029-035-NJC033-230118-
/O.CAN.KPHI.FF.W.0015.000000T0000Z-120623T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
NEW CASTLE DE-CECIL MD-KENT MD-KENT DE-QUEEN ANNE'S MD-SALEM NJ-
908 PM EDT FRI JUN 22 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHWESTERN
SALEM...NORTHEASTERN QUEEN ANNE'S...NORTHERN KENT...NORTHEASTERN
KENT...SOUTHEASTERN CECIL AND SOUTHERN NEW CASTLE COUNTIES...

THE WATERS FROM THE EARLIER HEAVY RAINS ARE RECEDING AND FLOOD WATERS
NO LONGER POSE A THREAT TO LIFE OR PROPERTY. THEREFORE...THE FLASH
FLOOD WARNING HAS BEEN CANCELLED.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MIDDLETOWN.

LAT...LON 3947 7590 3950 7556 3946 7558 3942 7553
      3945 7551 3946 7555 3950 7555 3952 7544
      3938 7542 3944 7550 3942 7553 3937 7551
      3932 7543 3926 7539 3922 7539 3918 7590

$$

KRUZDLO

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 22, 8:00 PM EDTSevere Thunderstorm WarningPHIBurlington, Monmouth, Ocean45 min
Jun 22, 8:19 PM EDTFlash Flood WarningPHICumberland, Gloucester, Salem70 min
Jun 22, 8:27 PM EDTSevere Thunderstorm WarningPHICumberland, Salem45 min
Jun 22, 8:28 PM EDTSpecial Marine WarningPHI62 min
Jun 22, 8:59 PM EDTSpecial Weather StatementPHICape May61 min
Jun 22, 9:14 PM EDTSpecial Weather StatementPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Ocean and 1 more61 min
Jun 22, 9:15 PM EDTAreal Flood AdvisoryPHIAtlantic, Cape May, Cumberland, Gloucester2 hr
Jun 22, 9:34 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Camden, Monmouth, Ocean116 min
Jun 22, 9:02 PM EDTSpecial Weather StatementPHIKent58 min
Jun 22, 9:29 PM EDTSpecial Weather StatementPHISussex61 min
Jun 22, 9:57 PM EDTSpecial Weather StatementPHISussex63 min
Jun 22, 10:50 PM EDTSpecial Weather StatementPHISussex85 min

Nearby

Flash Flood Warnings in Maryland, 2012Flash Flood Warnings in Delaware, 2012Flash Flood Warnings in New Jersey, 2012Every flash flood warning in 2012

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.