Alert archive / Maryland / Areal Flood Warnings in 2011
Areal Flood Warning 32, NWS Philadelphia/Mount Holly
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.
- 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
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
$$
IOVINO1 follow-up statement
682
WGUS81 KPHI 141948
FLSPHI
FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
348 PM EDT SUN AUG 14 2011
MDC015-029-141957-
/O.CAN.KPHI.FA.W.0032.000000T0000Z-110815T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CECIL MD-KENT MD-
348 PM EDT SUN AUG 14 2011
...THE FLOOD WARNING HAS BEEN CANCELLED FOR URBAN AREAS AND SMALL
STREAMS IN KENT AND CECIL COUNTIES...
THE HEAVY RAIN HAS MOVED OUT OF NORTHEASTERN MARYLAND AND SMALL
STREAMS AND CREEKS HAVE RETURNED TO THEIR BANKS. AS A RESULT...THE
FLOOD WARNING HAS BEEN CANCELLED.
LAT...LON 3918 7627 3934 7617 3938 7611 3937 7607
3944 7599 3946 7602 3953 7599 3955 7609
3972 7623 3973 7580 3925 7576 3927 7586
3924 7601 3920 7606 3916 7604 3906 7619
3902 7619 3901 7622
$$
IOVINOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 12:37 AM EDT | Areal Flood Advisory | PHI | Cecil | 3 hr |
| Aug 14, 1:12 AM EDT | Flash Flood Warning | PHI | Cecil | 4 hr |
| Aug 14, 1:51 AM EDT | Areal Flood Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 6 hr |
| Aug 14, 2:27 AM EDT | Flash Flood Warning | PHI | Caroline, Kent, Queen Anne's | 4 hr |
| Aug 14, 3:42 AM EDT | Flash Flood Watch | PHI | Caroline, Cecil, Kent, Queen Anne's, Talbot | 25 hr |
| Aug 14, 5:03 AM EDT | Flash Flood Warning | PHI | Cecil, Kent, Queen Anne's | 4 hr |
| Aug 14, 7:43 AM EDT | Flash Flood Warning | PHI | Kent, Queen Anne's | 4 hr |
| Aug 14, 8:41 AM EDT | Flash Flood Warning | PHI | Cecil, Kent, Queen Anne's | 4 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.