Alert archive / Maryland / Special Weather Statements in 2013

Special Weather Statement, NWS Philadelphia/Mount Holly

July 19, 2013Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 19, 2013, 8:42 PM EDT for Cecil County, Maryland. It was in force for 33 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
Jul 19, 2013, 8:42 PM EDT (00:42 UTC)
Expired
Jul 19, 2013, 9:15 PM EDT
In force
33 min
Issued by
NWS Philadelphia/Mount Holly

County Cecil County, MD

The radar

The Dover AFB radar (KDOX), 99 km from the middle of the area, began a volume at 00:44 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, 0.7 hours before the alert went out and 135 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 2013-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3898 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 2013-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 square meters per square second.1939Sfc1 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
3898 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1191 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
68 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.

137 
WWUS81 KPHI 200042
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
842 PM EDT FRI JUL 19 2013

MDZ008-200115-
CECIL MD-
842 PM EDT FRI JUL 19 2013

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN CECIL COUNTY...

AT 840 PM EDT...A STRONG THUNDERSTORM WAS NEAR CARSINS...MOVING EAST
AT 25 MPH.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM. FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. DO NOT STAY IN THE
OPEN NOR SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE
INDOORS WHEN A THUNDERSTORM APPROACHES. 

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO 
POND ON ROADS AND FILL POOR DRAINAGE AREAS. THE RAIN CAN CAUSE RAPID 
RISES ON SMALL STREAMS AND CREEKS. 

THIS STORM WILL BE NEAR OCTORARO AROUND 850 PM...PERRYVILLE AROUND 
900 PM...CHARLESTOWN AROUND 910 PM AND NORTH EAST AROUND 920 PM.

LAT...LON 3965 7616 3972 7594 3952 7580 3947 7600
      3952 7599 3955 7603 3954 7605 3954 7608
      3956 7609 3957 7609 3956 7608 3957 7608
      3964 7616

$$

ROBERTSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 19, 8:05 PM EDTSpecial Weather StatementPHIHunterdon25 min
Jul 19, 8:26 PM EDTSpecial Weather StatementPHIHunterdon34 min
Jul 19, 8:58 PM EDTSpecial Weather StatementPHIHunterdon, Somerset32 min
Jul 19, 9:24 PM EDTSpecial Weather StatementPHISomerset36 min
Jul 20, 4:18 PM EDTSpecial Weather StatementPHIMorris57 min
Jul 20, 5:47 PM EDTSpecial Weather StatementPHIMonmouth58 min
Jul 20, 6:36 PM EDTSpecial Weather StatementPHISomerset39 min
Jul 20, 6:41 PM EDTSevere Thunderstorm WarningPHIMiddlesex, Somerset64 min
Jul 20, 6:57 PM EDTSpecial Weather StatementPHIHunterdon63 min
Jul 20, 7:16 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren59 min
Jul 20, 7:54 PM EDTSpecial Weather StatementPHISalem66 min
Jul 19, 8:24 PM EDTSpecial Weather StatementPHIBerks36 min
Jul 19, 8:33 PM EDTSevere Thunderstorm WarningPHIBerks42 min
Jul 19, 9:01 PM EDTSpecial Weather StatementPHIChester29 min
Jul 19, 9:07 PM EDTSevere Thunderstorm WarningPHIBerks, Bucks, Lehigh, Northampton38 min
Jul 19, 9:41 PM EDTSpecial Weather StatementPHINorthampton34 min
Jul 20, 2:39 PM EDTSpecial Weather StatementPHIMonroe51 min
Jul 20, 3:31 PM EDTSpecial Weather StatementPHIMonroe59 min
Jul 20, 5:13 PM EDTSpecial Weather StatementPHILehigh62 min

Nearby

Special Weather Statements in Maryland, 2013Every special weather statement in 2013

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.