Alert archive / Pennsylvania / Areal Flood Advisories in 2011

Areal Flood Advisory 21, NWS Philadelphia/Mount Holly

May 15, 2011Berks County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this areal flood advisory at May 15, 2011, 7:20 PM EDT for Berks County, Lehigh County, Pennsylvania. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 15, 2011, 7:20 PM EDT (23:20 UTC)
Expired: May 15, 2011, 10:15 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Berks County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 155 km from the middle of the area, began a volume at 23:21 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 12:00Z, 11.3 hours before the alert went out and 207 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: 55 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 545 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 50 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.

573 
WGUS81 KPHI 152320
FLSPHI

FLOOD ADVISORY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
720 PM EDT SUN MAY 15 2011

PAC011-077-160215-
/O.NEW.KPHI.FA.Y.0021.110515T2320Z-110516T0215Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BERKS PA-LEHIGH PA-
720 PM EDT SUN MAY 15 2011

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED AN

* URBAN AND SMALL STREAM FLOOD ADVISORY FOR...
  WESTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
  NORTHWESTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 1015 PM EDT

* AT 719 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
AN AREA OF HEAVY RAIN OF MOVING INTO WESTERN BERKS COUNTY. THIS AREA 
RECEIVED HEAVY RAIN EARLIER THIS AFTERNOON...AND THE ADDITIONAL RAIN 
COULD RESULT IN STREET FLOODING...FLOODING IN AREAS OF POOR 
DRAINAGE...AS WELL AS SHARP RISES ON CREEKS AND STREAMS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLOOD ADVISORY MEANS RIVER OR STREAM FLOWS ARE ELEVATED OR PONDING
OF WATER IN URBAN OR OTHER AREAS IS OCCURRING OR IS IMMINENT.

&&

LAT...LON 4053 7625 4054 7618 4060 7605 4059 7603
      4065 7600 4077 7572 4076 7562 4028 7606
      4028 7611 4036 7621 4036 7624 4042 7632

$$

HAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 11:46 PM EDT	Special Weather Statement	PHI	Berks, Chester, Delaware, Montgomery	89 min
May 15, 12:52 AM EDT	Special Weather Statement	PHI	Bucks, Carbon, Lehigh, Monroe, Montgomery, Northampton and 1 more	83 min
May 15, 2:26 PM EDT	Special Weather Statement	PHI	Berks	64 min
May 15, 2:46 PM EDT	Special Weather Statement	PHI	Schuylkill	59 min
May 15, 2:55 PM EDT	Special Weather Statement	PHI	Delaware	65 min
May 15, 3:30 PM EDT	Special Weather Statement	PHI	Berks	60 min
May 15, 3:37 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	53 min
May 15, 3:39 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	44 min
May 15, 4:14 PM EDT	Special Weather Statement	PHI	Lehigh	61 min
May 15, 4:19 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	56 min
May 15, 4:31 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	59 min
May 15, 4:35 PM EDT	Special Weather Statement	PHI	Lehigh	55 min
May 15, 4:52 PM EDT	Special Weather Statement	PHI	Northampton	68 min
May 15, 5:03 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Monroe, Northampton	57 min
May 15, 5:33 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh	57 min
May 15, 5:37 PM EDT	Special Weather Statement	PHI	Bucks	53 min
May 15, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	59 min
May 15, 6:39 PM EDT	Special Weather Statement	PHI	Berks	66 min
May 15, 7:28 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	62 min
May 15, 7:37 PM EDT	Special Weather Statement	PHI	Berks	53 min

Nearby

Areal Flood Advisories in Pennsylvania, 2011 Every areal flood advisory 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.