Alert archive / Pennsylvania / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

April 16, 2011Berks County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Apr 16, 2011, 9:49 PM EDT for Berks County, Lehigh County, Pennsylvania. It was in force for 56 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 16, 2011, 9:49 PM EDT (01:49 UTC)
Expired
Apr 16, 2011, 10:45 PM EDT
In force
56 min
Issued by
NWS Philadelphia/Mount Holly

Counties Berks County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 140 km from the middle of the area, began a volume at 01:49 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, 1.8 hours before the alert went out and 221 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 2011-04-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 132 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 2011-04-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 574 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
132 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
547 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
574 m²/s²
0-3 km storm-relative helicity
593 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

The text

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

675 
WWUS81 KPHI 170149
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
949 PM EDT SAT APR 16 2011

PAZ060-061-068-170245-
BERKS PA-LEHIGH PA-MONTGOMERY PA-
949 PM EDT SAT APR 16 2011

...A LINE OF GUSTY SHOWERS AND THUNDERSTORMS WILL AFFECT 
BERKS...LEHIGH AND MONTGOMERY COUNTIES...

AT 946 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
LINE OF GUSTY SHOWERS AND THUNDERSTORMS MOVING ACROSS BERKS COUNTY. 
THIS LINE IS MOVING TO THE EAST AT AROUND 45 MPH. 

AT 938 PM EDT...A WIND GUST TO 46 MPH WAS MEASURED AT THE READING 
AIRPORT AS THIS LINE MOVED THROUGH.

WIND GUSTS UP TO 50 MPH WILL LOCALLY OCCUR AS THIS LINE MOVES 
THROUGH. THERE IS LITTLE TO NO CLOUD TO GROUND LIGHTNING OCCURRING 
WITH LINE OF HEAVY SHOWERS AND THUNDERSTORMS.

LAT...LON 4059 7608 4060 7605 4059 7603 4065 7600
      4073 7580 4077 7564 4058 7545 4035 7551
      4015 7591 4040 7597

$$

FORECASTER: GORSE

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 16, 8:08 PM EDTAreal Flood WarningPHIAtlantic, Burlington, Camden, Cumberland, Gloucester, Mercer and 4 more8 hr
Apr 16, 8:38 PM EDTSevere Thunderstorm WarningPHICumberland52 min
Apr 16, 8:46 PM EDTSpecial Marine WarningPHI59 min
Apr 16, 9:39 PM EDTSpecial Weather StatementPHIAtlantic, Burlington, Ocean51 min
Apr 16, 10:09 PM EDTAreal Flood WarningPHIAtlantic, Burlington, Cape May, Cumberland, Monmouth, Ocean6 hr
Apr 16, 10:19 PM EDTSpecial Weather StatementPHIMonmouth, Ocean41 min
Apr 16, 11:21 PM EDTRiver Flood WarningPHIMorris, Somerset42 hr
Apr 17, 12:04 AM EDTRiver Flood WarningPHIMorris, Passaic42 hr
Apr 17, 12:37 AM EDTSmall Craft AdvisoryPHI34 hr
Apr 17, 12:40 AM EDTRiver Flood WarningPHIPassaic69 hr
Apr 17, 12:45 AM EDTRiver Flood WarningPHIMercer10 hr
Apr 17, 12:50 AM EDTRiver Flood WarningPHIHunterdon, Somerset6 hr
Apr 17, 12:50 AM EDTRiver Flood WarningPHISomerset11 hr
Apr 17, 12:50 AM EDTRiver Flood WarningPHIMiddlesex, Somerset23 hr
Apr 17, 12:50 AM EDTRiver Flood WarningPHIMiddlesex, Somerset23 hr
Apr 17, 3:03 AM EDTRiver Flood WarningPHIEssex, Morris, Passaic5 days
Apr 17, 3:03 AM EDTRiver Flood WarningPHIEssex, Passaic5 days
Apr 17, 3:19 AM EDTRiver Flood WarningPHIMorris, Passaic43 hr
Apr 17, 3:19 AM EDTRiver Flood WarningPHIBergen, Morris, Passaic32 hr
Apr 17, 3:19 AM EDTRiver Flood WarningPHIMorris32 hr
Apr 17, 3:19 AM EDTRiver Flood WarningPHIMorris49 hr
Apr 17, 5:39 AM EDTRiver Flood WarningPHISomerset38 hr
Apr 17, 8:39 AM EDTRiver Flood WarningPHIBurlington30 hr
Apr 17, 9:51 AM EDTCoastal Flood WarningPHIBurlington, Camden, Gloucester, Mercer4 hr
Apr 17, 9:51 AM EDTCoastal Flood AdvisoryPHISalem3 hr
Apr 16, 9:11 PM EDTSevere Thunderstorm WarningPHIChester64 min
Apr 16, 9:18 PM EDTRiver Flood WarningPHIChester11 hr
Apr 16, 9:32 PM EDTRiver Flood WarningPHIDelaware6 hr
Apr 16, 11:09 PM EDTRiver Flood WarningPHIBucks13 hr
Apr 16, 11:11 PM EDTRiver Flood WarningPHIMontgomery6 hr
Apr 17, 1:05 AM EDTAreal Flood WarningPHIBerks5 hr
Apr 17, 3:56 AM EDTAreal Flood WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia6 hr
Apr 17, 6:07 AM EDTAreal Flood WarningPHIChester3 hr
Apr 17, 6:37 AM EDTRiver Flood WarningPHIChester, Delaware7 hr
Apr 17, 5:55 PM EDTRiver Flood WarningPHICecil, Harford26 hr
Apr 16, 8:30 PM EDTSpecial Weather StatementPHISussex30 min
Apr 16, 8:42 PM EDTRiver Flood WarningPHINew Castle6 hr

Nearby

Special Weather Statements in Pennsylvania, 2011Every special weather statement 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.