Alert archive / Maryland / Areal Flood Advisories in 2015

Areal Flood Advisory 21, NWS Philadelphia/Mount Holly

May 29, 2015Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this areal flood advisory at May 29, 2015, 12:48 AM EDT for Queen Anne's County, Maryland. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: May 29, 2015, 12:48 AM EDT (04:48 UTC)
Expired: May 29, 2015, 5:20 AM EDT
In force: 5 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 62 km from the middle of the area, began a volume at 04:50 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, 4.8 hours before the alert went out and 117 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: 444 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1502 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

555 
WGUS81 KPHI 290448
FLSPHI

FLOOD ADVISORY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1248 AM EDT FRI MAY 29 2015

MDC035-290745-
/O.NEW.KPHI.FA.Y.0021.150529T0448Z-150529T0745Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
QUEEN ANNE'S MD-
1248 AM EDT FRI MAY 29 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLOOD ADVISORY FOR...
  CENTRAL QUEEN ANNE'S COUNTY IN NORTHEASTERN MARYLAND...

* UNTIL 345 AM EDT

* AT 1247 AM EDT...DOPPLER RADAR INDICATED HEAVY RAIN THAT WILL CAUSE
  MINOR FLOODING IN THE ADVISORY AREA. UP TO ONE INCH OF RAIN HAS
  ALREADY FALLEN.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CENTERVILLE...AND CARVILLE. 

ADDITIONAL RAINFALL OF AN INCH IS EXPECTED OVER THE AREA. THIS 
ADDITIONAL RAIN WILL MAKE MINOR FLOODING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IT IS HARDER TO SEE FLOODED ROADWAYS AT NIGHT. 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. 

&&

LAT...LON 3914 7609 3914 7607 3908 7597 3899 7602
      3909 7614

$$

ROBERTSON

2 follow-up statements

815 
WGUS81 KPHI 290728
FLSPHI

FLOOD ADVISORY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
328 AM EDT FRI MAY 29 2015

MDC035-291045-
/O.EXT.KPHI.FA.Y.0021.000000T0000Z-150529T1045Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
QUEEN ANNE'S MD-
328 AM EDT FRI MAY 29 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS EXTENDED THE

* FLOOD ADVISORY FOR...
  CENTRAL QUEEN ANNE'S COUNTY IN NORTHEASTERN MARYLAND...

* UNTIL 645 AM EDT

* AT 326 AM EDT...DOPPLER RADAR INDICATED RAIN CONTINUING ACROSS  
  THE ADVISORY AREA. ONE TO TWO INCH OF RAIN HAS ALREADY FALLEN WITH 
  ADDITIONAL RAINFALL OF A HALF AN INCH TO ONE INCH IS EXPECTED OVER 
  THE AREA.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CENTERVILLE...CENTREVILLE AND CARVILLE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IT IS HARDER TO SEE FLOODED ROADWAYS AT NIGHT. 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. 

&&

LAT...LON 3914 7609 3914 7607 3908 7597 3899 7602
      3909 7614

$$

ROBERTSON

286 
WGUS81 KPHI 290920
FLSPHI

FLOOD ADVISORY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
520 AM EDT FRI MAY 29 2015

MDC035-290930-
/O.CAN.KPHI.FA.Y.0021.000000T0000Z-150529T1045Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
QUEEN ANNE'S MD-
520 AM EDT FRI MAY 29 2015

...THE FLOOD ADVISORY HAS BEEN CANCELLED FOR CENTRAL QUEEN ANNE'S
COUNTY...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO 
POSE A THREAT. A FLOOD ADVISORY REMAINS FOR THE EASTERN PORTIONS OF 
QUEEN ANNE'S COUNTY.

LAT...LON 3914 7609 3914 7607 3908 7597 3899 7602
      3909 7614

$$

ROBERTSON

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 12:01 AM EDT	Areal Flood Advisory	PHI	Kent	5 hr
May 29, 1:02 AM EDT	Areal Flood Advisory	PHI	Queen Anne's	3 hr
May 29, 1:37 AM EDT	Areal Flood Advisory	PHI	Kent, Queen Anne's	3 hr
May 29, 2:44 AM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	3 hr
May 29, 2:55 AM EDT	Areal Flood Advisory	PHI	Queen Anne's, Talbot	3 hr
May 29, 4:01 AM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	3 hr
May 29, 2:58 PM EDT	Areal Flood Advisory	PHI	Caroline	3 hr
May 29, 3:34 PM EDT	Areal Flood Advisory	PHI	Caroline, Talbot	3 hr
May 29, 4:08 PM EDT	Areal Flood Advisory	PHI	Caroline, Kent, Queen Anne's, Talbot	3 hr

Nearby

Areal Flood Advisories in Maryland, 2015 Every areal flood advisory in 2015

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.