Alert archive / Maryland / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

September 1, 2012Caroline County, Queen Anne's County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Sep 1, 2012, 9:27 PM EDT for Caroline County, Queen Anne's County, Talbot County, Maryland. It was in force for 93 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
Sep 1, 2012, 9:27 PM EDT (01:27 UTC)
Expired
Sep 1, 2012, 11:00 PM EDT
In force
93 min
Issued by
NWS Philadelphia/Mount Holly

Counties Caroline County, MD, Queen Anne's County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 66 km from the middle of the area, began a volume at 01:27 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, 1.5 hours before the alert went out and 105 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 2012-09-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2794 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2012-09-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 square meters per square second.193958Sfc1 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
2794 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1142 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
50 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

130 
WWUS81 KPHI 020127
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
927 PM EDT SAT SEP 1 2012

MDZ012-015-019-020-020300-
CAROLINE MD-KENT MD-QUEEN ANNE'S MD-TALBOT MD-
927 PM EDT SAT SEP 1 2012

...AN AREA OF SHOWERS AND STRONG THUNDERSTORMS WILL AFFECT 
CAROLINE...KENT...QUEEN ANNE'S AND TALBOT COUNTIES...

AT 920 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE 
LEADING EDGE OF SHOWERS AND STRONG THUNDERSTORMS ALONG A LINE 
EXTENDING FROM 13 MILES SOUTHEAST OF BALTIMORE TO 34 MILES SOUTHEAST 
OF BALTIMORE TO 59 MILES SOUTH OF BALTIMORE...MOVING SOUTHEAST AT 15 
MPH. THE THUNDERSTORMS WILL BE NEAR ROCK HALL...TILGHMAN ISLAND 
AROUND 945 PM...ST. MICHAELS AROUND 1000 PM...OVERTON...COPPERVILLE 
AROUND 1015 PM...CENTREVILLE...QUEENSTOWN AROUND 1030 PM...WYE MILLS 
AND STARR AROUND 1045 PM.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS. DO
NOT SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS
WHEN A THUNDERSTORM APPROACHES.

VERY HEAVY RAIN WILL FALL FROM THESE STORMS...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL POOR DRAINAGE AREAS. WIND GUSTS TO AROUND
30 MPH ARE POSSIBLE WITH THESE STORMS.

LAT...LON 3872 7626 3867 7635 3877 7640 3875 7635
      3887 7625 3881 7621 3882 7620 3894 7624
      3890 7625 3892 7628 3884 7638 3904 7632
      3899 7627 3900 7618 3903 7625 3919 7626
      3888 7575 3865 7572 3869 7590 3857 7604

$$

TFG

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 2, 1:09 PM EDTAreal Flood AdvisoryPHICumberland, Salem2 hr
Sep 2, 5:14 PM EDTSpecial Weather StatementPHIMiddlesex, Monmouth, Somerset2 hr
Sep 2, 5:38 PM EDTAreal Flood AdvisoryPHIMiddlesex, Monmouth3 hr
Sep 2, 7:37 PM EDTSpecial Weather StatementPHIMonmouth113 min
Sep 2, 12:25 AM EDTSpecial Weather StatementPHISussex95 min
Sep 2, 12:40 PM EDTAreal Flood AdvisoryPHINew Castle83 min
Sep 2, 3:00 PM EDTAreal Flood AdvisoryPHISussex2 hr
Sep 2, 3:38 PM EDTFlash Flood WarningPHISussex3 hr
Sep 2, 4:51 PM EDTAreal Flood AdvisoryPHISussex89 min
Sep 1, 8:07 PM EDTSevere Thunderstorm WarningPHIKent, Queen Anne's38 min
Sep 1, 8:47 PM EDTSpecial Weather StatementPHICaroline, Queen Anne's88 min
Sep 1, 10:34 PM EDTSpecial Weather StatementPHICaroline, Talbot86 min
Sep 1, 11:44 PM EDTSpecial Weather StatementPHIWicomico61 min
Sep 2, 3:17 PM EDTAreal Flood AdvisoryPHICaroline118 min
Sep 2, 3:57 PM EDTFlash Flood WarningPHICaroline2 hr
Sep 2, 6:33 PM EDTSpecial Weather StatementPHIKent117 min

Nearby

Special Weather Statements in Maryland, 2012Every special weather statement in 2012

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.