Alert archive / Maryland / Areal Flood Warnings in 2011

Areal Flood Warning 32, NWS Philadelphia/Mount Holly

August 14, 2011Cecil County, Kent County, Maryland

NWS Philadelphia/Mount Holly issued this areal flood warning at Aug 14, 2011, 12:16 PM EDT for Cecil County, Kent 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
Aug 14, 2011, 12:16 PM EDT (16:16 UTC)
Expired
Aug 14, 2011, 3:48 PM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Cecil County, MD, Kent County, MD

The radar

The Dover AFB radar (KDOX), 77 km from the middle of the area, began a volume at 16:19 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 12:00Z, 4.3 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 12:00Z on 2011-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 618 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 12:00Z on 2011-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.19395878Sfc1 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
618 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
493 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
156 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.5

Open this sounding in Storm Lab

The text

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

429 
WGUS41 KPHI 141616
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1216 PM EDT SUN AUG 14 2011

MDC015-029-150015-
/O.NEW.KPHI.FA.W.0032.110814T1616Z-110815T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CECIL MD-KENT MD-
1216 PM EDT SUN AUG 14 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS IN...
  CECIL COUNTY IN NORTHEAST MARYLAND...
  KENT COUNTY IN NORTHEAST MARYLAND...

* UNTIL 815 PM EDT SUNDAY

* AT 1215 PM EDT...SHOWERS AND THUNDERSTORMS WITH LOCALLY HEAVY RAIN
  WERE CONTINUING TO MOVE THROUGH NORTHEASTERN MARYLAND. BY MIDDAY
  MUCH OF THE REGION HAD RECEIVED 2 TO 4 INCHES OF RAIN WITH SOME
  SPOTS GETTING UP TO 4 OR 5 INCHES OF RAIN. ADDITIONAL HEAVY
  RAINFALL FROM THIS AFTERNOON INTO THIS EVENING WILL PRODUCE MORE
  FLOODING.

A FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR HAS BEEN 
REPORTED. IF YOU LIVE IN A LOCATION THAT IS PRONE TO FLOODING...BE 
PREPARED TO MOVE TO HIGHER GROUND.

DO NOT DRIVE YOUR VEHICLE THROUGH FLOOD WATERS. THE WATER MAY BE 
DEEPER THAN YOU THINK IT IS. YOU WILL BE PUTTING YOURSELF IN DANGER 
AND YOU MAY DAMAGE YOUR VEHICLE...LEADING TO COSTLY REPAIRS.

LAT...LON 3918 7627 3934 7617 3938 7611 3937 7607
      3944 7599 3946 7602 3953 7599 3955 7609
      3972 7623 3973 7580 3925 7576 3927 7586
      3924 7601 3920 7606 3916 7604 3906 7619
      3902 7619 3901 7622

$$

IOVINO
1 follow-up statement
682 
WGUS81 KPHI 141948
FLSPHI

FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
348 PM EDT SUN AUG 14 2011

MDC015-029-141957-
/O.CAN.KPHI.FA.W.0032.000000T0000Z-110815T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CECIL MD-KENT MD-
348 PM EDT SUN AUG 14 2011

...THE FLOOD WARNING HAS BEEN CANCELLED FOR URBAN AREAS AND SMALL
STREAMS IN KENT AND CECIL COUNTIES...

THE HEAVY RAIN HAS MOVED OUT OF NORTHEASTERN MARYLAND AND SMALL 
STREAMS AND CREEKS HAVE RETURNED TO THEIR BANKS. AS A RESULT...THE 
FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 3918 7627 3934 7617 3938 7611 3937 7607
      3944 7599 3946 7602 3953 7599 3955 7609
      3972 7623 3973 7580 3925 7576 3927 7586
      3924 7601 3920 7606 3916 7604 3906 7619
      3902 7619 3901 7622

$$

IOVINO

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 12:37 AM EDTAreal Flood AdvisoryPHICecil3 hr
Aug 14, 1:12 AM EDTFlash Flood WarningPHICecil4 hr
Aug 14, 1:51 AM EDTAreal Flood AdvisoryPHICaroline, Kent, Queen Anne's, Talbot6 hr
Aug 14, 2:27 AM EDTFlash Flood WarningPHICaroline, Kent, Queen Anne's4 hr
Aug 14, 3:42 AM EDTFlash Flood WatchPHICaroline, Cecil, Kent, Queen Anne's, Talbot25 hr
Aug 14, 5:03 AM EDTFlash Flood WarningPHICecil, Kent, Queen Anne's4 hr
Aug 14, 7:43 AM EDTFlash Flood WarningPHIKent, Queen Anne's4 hr
Aug 14, 8:41 AM EDTFlash Flood WarningPHICecil, Kent, Queen Anne's4 hr

Nearby

Areal Flood Warnings in Maryland, 2011Every areal flood warning in 2011

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.