Alert archive / Maryland / Areal Flood Advisories in 2016

Areal Flood Advisory 13, NWS Philadelphia/Mount Holly

February 24, 20165 counties in Maryland; Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood advisory at Feb 24, 2016, 7:21 PM EST for 5 counties in Maryland; Chester County, Pennsylvania. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Feb 24, 2016, 7:21 PM EST (00:21 UTC)
Expired
Feb 24, 2016, 11:15 PM EST
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

Counties Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD, Chester County, PA

The radar

The Dover AFB radar (KDOX), 67 km from the middle of the area, began a volume at 00:21 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, 0.4 hours before the alert went out and 111 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 2016-02-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2016-02-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 square meters per square second.1939587897117Sfc1 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
27 J/kg
Mixed-layer CIN
-212 J/kg
Mixed-layer LCL
800 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
153 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

As transmitted.

248 
WGUS81 KPHI 250021
FLSPHI

FLOOD ADVISORY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
721 PM EST WED FEB 24 2016

MDC011-015-029-035-041-PAC029-250415-
/O.NEW.KPHI.FA.Y.0013.160225T0021Z-160225T0415Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KENT MD-TALBOT MD-CECIL MD-QUEEN ANNE'S MD-CAROLINE MD-CHESTER PA-
721 PM EST WED FEB 24 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLOOD ADVISORY FOR MINOR FLOODING IN POOR DRAINAGE AREAS FOR...
  KENT COUNTY IN NORTHEASTERN MARYLAND...
  TALBOT COUNTY IN EASTERN MARYLAND...
  CECIL COUNTY IN NORTHEASTERN MARYLAND...
  QUEEN ANNE'S COUNTY IN NORTHEASTERN MARYLAND...
  CAROLINE COUNTY IN EASTERN MARYLAND...
  SOUTHWESTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 1115 PM EST

* AT 719 PM EST...DOPPLER RADAR INDICATED VERY HEAVY RAIN
  APPROACHING THE REGION. WITH THE GROUND EITHER FROZEN OR
  SATURATED, EXCESSIVE RUNOFF WILL OCCUR. EXPECT MINOR FLOODING
  ACROSS THOSE LOW LYING AND POOR DRAINAGE AREAS THAT TYPICALLY
  EXPERIENCE FLOODING. SMALL RUNS AND CREEKS COULD ALSO FILL UP
  QUICKLY AND OVERFLOW. ROADS MAY BECOME IMPASSABLE FOR A SHORT TIME
  UNTIL WATERS RECEDE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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. MOVE TO HIGHER GROUND.

&&

LAT...LON 3901 7620 3925 7623 3942 7600 3952 7598
      3972 7623 3973 7610 3993 7597 3984 7576
      3865 7571 3870 7590 3857 7604 3876 7622
      3877 7631 3886 7626 3879 7620 3879 7619
      3896 7625 3884 7637 3885 7638

$$

KRUZDLO
1 follow-up statement
363 
WGUS81 KPHI 250408
FLSPHI

FLOOD ADVISORY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1108 PM EST WED FEB 24 2016

MDC011-015-029-035-041-PAC029-250416-
/O.EXP.KPHI.FA.Y.0013.000000T0000Z-160225T0415Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KENT MD-TALBOT MD-CECIL MD-QUEEN ANNE'S MD-CAROLINE MD-CHESTER PA-
1108 PM EST WED FEB 24 2016

...THE FLOOD ADVISORY FOR MINOR FLOODING IN POOR DRAINAGE AREAS WILL
EXPIRE AT 1115 PM EST FOR KENT...TALBOT...CECIL...QUEEN ANNE'S...
CAROLINE AND SOUTHWESTERN CHESTER COUNTIES...

FLOOD AND FLASH FLOOD WARNINGS ARE REPLACING PORTIONS OF THIS
ADVISORY. PLEASE REFER TO THE WARNINGS ISSUED FOR THIS AREA.

LAT...LON 3901 7620 3925 7623 3942 7600 3952 7598
      3972 7623 3973 7610 3993 7597 3984 7576
      3865 7571 3870 7590 3857 7604 3876 7622
      3877 7631 3886 7626 3879 7620 3879 7619
      3896 7625 3884 7637 3885 7638

$$

KRUZDLO

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 24, 7:12 PM ESTSevere Thunderstorm WarningPHICecil33 min
Feb 24, 8:02 PM ESTSpecial Weather StatementPHICaroline, Cecil, Kent, Queen Anne's, Talbot58 min
Feb 24, 8:47 PM ESTSevere Thunderstorm WarningPHICaroline, Cecil, Kent, Queen Anne's, Talbot43 min
Feb 24, 9:44 PM ESTAreal Flood WarningPHICecil10 hr
Feb 24, 10:05 PM ESTFlash Flood WarningPHICaroline, Kent, Queen Anne's4 hr
Feb 25, 7:41 AM ESTAreal Flood WarningPHICecil6 hr
Feb 24, 7:35 PM ESTAreal Flood AdvisoryPHICarbon, Monroe6 hr
Feb 24, 7:39 PM ESTSevere Thunderstorm WarningPHIBerks, Chester36 min
Feb 24, 8:13 PM ESTSpecial Weather StatementPHIChester, Montgomery62 min
Feb 24, 8:23 PM ESTSpecial Weather StatementPHILehigh, Monroe, Northampton67 min
Feb 24, 8:42 PM ESTAreal Flood AdvisoryPHIBucks, Chester, Delaware, Lehigh, Monroe, Montgomery and 2 more4 hr
Feb 24, 9:18 PM ESTAreal Flood AdvisoryPHIBucks4 hr
Feb 24, 9:40 PM ESTSevere Thunderstorm WarningPHIBucks, Delaware, Montgomery, Philadelphia35 min
Feb 24, 9:55 PM ESTFlash Flood WarningPHIBucks, Lehigh, Monroe, Northampton4 hr
Feb 24, 10:11 PM ESTRiver Flood WarningPHIChester20 hr
Feb 24, 10:32 PM ESTFlash Flood WarningPHIBucks4 hr
Feb 24, 11:03 PM ESTSevere Thunderstorm WarningPHIBucks42 min
Feb 25, 12:19 AM ESTRiver Flood WarningPHIMontgomery14 hr
Feb 25, 12:28 AM ESTRiver Flood WarningPHIChester, Delaware18 hr
Feb 25, 12:37 AM ESTRiver Flood WarningPHIChester, Montgomery, Philadelphia28 hr
Feb 25, 1:55 AM ESTAreal Flood WarningPHIBucks, Lehigh, Monroe, Northampton6 hr
Feb 25, 2:04 AM ESTAreal Flood WarningPHIBucks, Delaware, Montgomery, Philadelphia4 hr
Feb 25, 2:07 AM ESTRiver Flood WarningPHIBerks, Montgomery8 hr
Feb 25, 2:22 AM ESTAreal Flood WarningPHIBucks8 hr
Feb 25, 7:51 AM ESTAreal Flood WarningPHIBucks, Lehigh, Monroe, Northampton6 hr

Nearby

Areal Flood Advisories in Maryland, 2016Areal Flood Advisories in Pennsylvania, 2016Every areal flood advisory in 2016

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.