Alert archive / Maryland / Special Weather Statements in 2015

Special Weather Statement, NWS Philadelphia/Mount Holly

August 4, 2015Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 4, 2015, 10:44 PM EDT for Talbot County, Maryland. It was in force for 31 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
Aug 4, 2015, 10:44 PM EDT (02:44 UTC)
Expired
Aug 4, 2015, 11:15 PM EDT
In force
31 min
Issued by
NWS Philadelphia/Mount Holly

County Talbot County, MD

The radar

The Dover AFB radar (KDOX), 72 km from the middle of the area, began a volume at 02:47 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, 2.7 hours before the alert went out and 102 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 2015-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 531 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 2015-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.1939587897Sfc1 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
531 J/kg
Mixed-layer CIN
-98 J/kg
Mixed-layer LCL
1426 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
124 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.8

Open this sounding in Storm Lab

The text

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

275 
WWUS81 KPHI 050244
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1044 PM EDT TUE AUG 4 2015
 
MDZ019-050315-
TALBOT-
1044 PM EDT TUE AUG 4 2015

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL TALBOT COUNTY...

AT 1044 PM EDT...A STRONG THUNDERSTORM WAS NEAR CHESAPEAKE BEACH...
MOVING EAST AT 30 MPH.

WIND GUSTS UP TO 40 MPH AND HALF INCH HAIL ARE POSSIBLE WITH THIS
STORM.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY 
CAUSE LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED 
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. 
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE 
SHELTER INSIDE A BUILDING OR VEHICLE.

THIS STORM WILL BE NEAR...
  TILGHMAN ISLAND AROUND 1055 PM EDT.
  TRAPPE...OXFORD AND HAMBLETON AROUND 1115 PM EDT.


LAT...LON 3876 7633 3878 7632 3878 7630 3876 7632
      3875 7630 3878 7628 3876 7602 3861 7606
      3864 7615 3868 7617 3868 7621 3871 7624
      3876 7622 3874 7623 3871 7627 3875 7631
      3867 7634 3874 7634 3876 7638
TIME...MOT...LOC 0244Z 282DEG 25KT 3870 7643 
$$

ROBERTSON

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 4, 8:04 PM EDTSpecial Weather StatementPHICumberland56 min
Aug 4, 10:07 PM EDTSpecial Weather StatementPHICape May53 min
Aug 4, 10:30 PM EDTAreal Flood AdvisoryPHICape May4 hr
Aug 4, 10:40 PM EDTSpecial Marine WarningPHI50 min
Aug 4, 10:56 PM EDTSpecial Weather StatementPHICape May19 min
Aug 4, 11:22 PM EDTSpecial Marine WarningPHI53 min
Aug 4, 11:10 PM EDTSpecial Weather StatementPHICaroline, Talbot50 min
Aug 4, 11:28 PM EDTSevere Thunderstorm WarningPHICaroline, Talbot32 min
Aug 4, 9:01 PM EDTSpecial Weather StatementPHINew Castle59 min
Aug 4, 10:24 PM EDTSpecial Weather StatementPHISussex51 min
Aug 4, 11:06 PM EDTSpecial Weather StatementPHISussex24 min
Aug 4, 11:18 PM EDTAreal Flood AdvisoryPHISussex4 hr
Aug 4, 11:35 PM EDTFlash Flood WarningPHISussex4 hr
Aug 4, 11:43 PM EDTSpecial Weather StatementPHISussex47 min
Aug 5, 12:04 AM EDTSpecial Weather StatementPHISussex41 min
Aug 5, 12:39 AM EDTFlash Flood WarningPHISussex4 hr
Aug 5, 12:52 AM EDTSpecial Weather StatementPHISussex23 min

Nearby

Special Weather Statements in Maryland, 2015Every special weather statement in 2015

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.