Alert archive / Pennsylvania / Areal Flood Warnings in 2016

Areal Flood Warning 10, NWS Philadelphia/Mount Holly

February 25, 2016Berks County, Chester County, Montgomery County, Pennsylvania; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this areal flood warning at Feb 25, 2016, 7:41 AM EST for Berks County, Chester County, Montgomery County, Pennsylvania; Cecil County, Maryland. It was in force for 6 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: Feb 25, 2016, 7:41 AM EST (12:41 UTC)
Expired: Feb 25, 2016, 1:30 PM EST
In force: 6 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Cecil County, MD, Berks County, PA, Chester County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 132 km from the middle of the area, began a volume at 12:42 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, 0.7 hours before the alert went out and 166 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1017 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -49 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

854 
WGUS41 KPHI 251241
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
741 AM EST THU FEB 25 2016

MDC015-PAC011-029-091-251830-
/O.NEW.KPHI.FA.W.0010.160225T1241Z-160225T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CECIL MD-CHESTER PA-BERKS PA-MONTGOMERY PA-
741 AM EST THU FEB 25 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLOOD WARNING FOR...
  CENTRAL CECIL COUNTY IN NORTHEASTERN MARYLAND...
  CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  EASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
  NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 130 PM EST

* AT 735 AM EST...CREEKS AND STREAMS ACROSS BERKS...CHESTER...UPPER
  MONTGOMERY COUNTIES IN SOUTHEAST PENNSYLVANIA...AND IN CECIL
  COUNTY MARYLAND...CONTINUE TO RUN HIGH AS A RESULT OF HEAVY RAIN
  DURING THE PAST 24 HOURS. WHILE MANY OF THESE CREEKS AND STREAMS
  HAVE CRESTED...SOME REMAIN ABOVE FLOOD STAGE. THE FLOOD WARNING
  THEREFORE CONTINUES UNTIL ENOUGH WATER DRAINS FROM THESE WATERWAYS
  SO THEY NO LONGER POSE A THREAT TO RESIDENTS IN THE AREA. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  READING...CALVERT...POTTSTOWN...COATESVILLE...WYOMISSING...
  DOWNINGTOWN...BIRDSBORO...OXFORD...KUTZTOWN...ROYERSFORD...
  FLEETWOOD...LAURELDALE...PARKESBURG...NORTH EAST...EAST
  GREENVILLE...WEST GROVE...RISING SUN...TOPTON...HONEY BROOK AND
  ELVERSON.

LAT...LON 3972 7623 3973 7610 3987 7599 3994 7598
      3995 7600 4004 7593 4011 7594 4014 7588
      4026 7606 4057 7573 4036 7540 3972 7588
      3948 7587 3957 7609

$$

JJM

1 follow-up statement

468 
WGUS81 KPHI 251830
FLSPHI

FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
130 PM EST THU FEB 25 2016

MDC015-PAC011-029-091-251839-
/O.EXP.KPHI.FA.W.0010.000000T0000Z-160225T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CECIL MD-CHESTER PA-BERKS PA-MONTGOMERY PA-
130 PM EST THU FEB 25 2016

...THE FLOOD WARNING WILL EXPIRE AT 130 PM EST CENTRAL CECIL...
CHESTER...EASTERN BERKS AND NORTHWESTERN MONTGOMERY COUNTIES...

MOST STREAMS IN THE AREA HAVE NOW RECEDED BACK INTO THEIR BANKS. THE
FLOOD WARNING WILL THEREFORE BE ALLOWED TO EXPIRE AT 130 PM.


LAT...LON 3972 7623 3973 7610 3987 7599 3994 7598
      3995 7600 4004 7593 4011 7594 4014 7588
      4026 7606 4057 7573 4036 7540 3972 7588
      3948 7587 3957 7609

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 24, 7:12 PM EST	Severe Thunderstorm Warning	PHI	Chester, Delaware	33 min
Feb 24, 7:21 PM EST	Areal Flood Advisory	PHI	Chester	4 hr
Feb 24, 7:35 PM EST	Areal Flood Advisory	PHI	Carbon, Monroe	6 hr
Feb 24, 7:39 PM EST	Severe Thunderstorm Warning	PHI	Berks, Chester	36 min
Feb 24, 8:13 PM EST	Special Weather Statement	PHI	Chester, Montgomery	62 min
Feb 24, 8:23 PM EST	Special Weather Statement	PHI	Lehigh, Monroe, Northampton	67 min
Feb 24, 8:42 PM EST	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Lehigh, Monroe, Montgomery and 2 more	4 hr
Feb 24, 8:47 PM EST	Severe Thunderstorm Warning	PHI	Chester	43 min
Feb 24, 9:18 PM EST	Areal Flood Advisory	PHI	Bucks	4 hr
Feb 24, 9:40 PM EST	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	35 min
Feb 24, 9:44 PM EST	Areal Flood Warning	PHI	Berks, Chester, Montgomery	10 hr
Feb 24, 9:55 PM EST	Flash Flood Warning	PHI	Bucks, Lehigh, Monroe, Northampton	4 hr
Feb 24, 10:05 PM EST	Flash Flood Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	4 hr
Feb 24, 10:11 PM EST	River Flood Warning	PHI	Chester	20 hr
Feb 24, 10:32 PM EST	Flash Flood Warning	PHI	Bucks	4 hr
Feb 24, 11:03 PM EST	Severe Thunderstorm Warning	PHI	Bucks	42 min
Feb 25, 12:19 AM EST	River Flood Warning	PHI	Montgomery	14 hr
Feb 25, 12:28 AM EST	River Flood Warning	PHI	Chester, Delaware	18 hr
Feb 25, 12:37 AM EST	River Flood Warning	PHI	Chester, Montgomery, Philadelphia	28 hr
Feb 25, 1:55 AM EST	Areal Flood Warning	PHI	Bucks, Lehigh, Monroe, Northampton	6 hr
Feb 25, 2:04 AM EST	Areal Flood Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	4 hr
Feb 25, 2:07 AM EST	River Flood Warning	PHI	Berks, Montgomery	8 hr
Feb 25, 2:22 AM EST	Areal Flood Warning	PHI	Bucks	8 hr
Feb 25, 7:51 AM EST	Areal Flood Warning	PHI	Bucks, Lehigh, Monroe, Northampton	6 hr
Feb 24, 8:02 PM EST	Special Weather Statement	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	58 min

Nearby

Areal Flood Warnings in Pennsylvania, 2016 Areal Flood Warnings in Maryland, 2016 Every areal flood warning 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.