Alert archive / Maryland / Flash Flood Warnings in 2006

Flash Flood Warning 23, NWS Philadelphia/Mount Holly

June 25, 2006Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 25, 2006, 10:46 PM EDT for Cecil 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
Jun 25, 2006, 10:46 PM EDT (02:46 UTC)
Expired
Jun 26, 2006, 2:45 AM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Counties, with a storm outline in the text

County Cecil County, MD

The radar

The Dover AFB radar (KDOX), 98 km from the middle of the area, began a volume at 02:48 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 2.8 hours before the alert went out and 122 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 00:00Z on 2006-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 494 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 00:00Z on 2006-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
494 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
720 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.5

Open this sounding in Storm Lab

The text

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

000 
WGUS51 KPHI 260250
FFWPHI
MDC015-260645-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1046 PM EDT SUN JUN 25 2006

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN AND WESTERN CECIL COUNTY IN NORTHEAST MARYLAND

* UNTIL 245 AM EDT

* AT 1044 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS WITH VERY HEAVY RAIN MOVING NORTHEAST FROM JUST EAST 
OF BALTIMORE MARYLAND.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO RISING
  SUN...NORTH EAST AND CHARLESTOWN

RAINFALL AMOUNTS OF UP TO AN INCH HAVE ALREADY FALLEN IN NORTHWEST 
SECTIONS OF THE COUNTY. ADDITIONAL RAINFALL OF 2 TO 4 INCHES IS
POSSIBLE IN THE WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

LAT...LON 3937 7637 3934 7609 3972 7580 3970 7621

$$

RPW
1 follow-up statement
000 
WGUS71 KPHI 260407
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1200 AM EDT MON JUN 26 2006

MDC015-260645-
CECIL MD-
1200 AM EDT MON JUN 26 2006

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM EDT FOR CECIL
COUNTY...

RAINFALL INTENSITIES HAVE DECREASED OVER MUCH OF THE COUNTY, BUT 
LIGHT TO MODERATE RAIN IS EXPECTED TO CONTINUE FOR THE NEXT FEW 
HOURS. ADDITIONAL RAINFALL AMOUNTS UP TO AROUND AN INCH ARE LIKELY 
AND LOCALLY HIGHER AMOUNTS ARE POSSIBLE, ESPECIALLY IN ANY 
THUNDERSTORMS.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

LAT...LON 3949 7610 3948 7580 3972 7580 3970 7621

$$

RPW

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 26, 9:10 AM EDTFlash Flood WarningPHICaroline, Queen Anne's3 hr
Jun 26, 12:47 PM EDTFlash Flood WarningPHICaroline, Queen Anne's118 min
Jun 26, 1:45 PM EDTCoastal Flood StatementPHICaroline, Cecil, Kent, Queen Anne's, Talbot24 hr

Nearby

Flash Flood Warnings in Maryland, 2006Every flash flood warning in 2006

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.