Alert archive / Maryland / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

July 19, 2012Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 19, 2012, 9:07 PM EDT for Queen Anne's County, Maryland. It was in force for 53 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, 2012, 9:07 PM EDT (01:07 UTC)
Expired: Jul 19, 2012, 10:00 PM EDT
In force: 53 min
Issued by: NWS Philadelphia/Mount Holly

County Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 72 km from the middle of the area, began a volume at 01:10 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, 1.1 hours before the alert went out and 99 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: 525 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1690 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 47 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.

664 
WWUS81 KPHI 200107
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
907 PM EDT THU JUL 19 2012

MDZ015-200200-
QUEEN ANNE'S MD-
907 PM EDT THU JUL 19 2012

...A DEVELOPING THUNDERSTORM WILL AFFECT QUEEN ANNE'S COUNTY...

AT 901 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
DEVELOPING THUNDERSTORM OVER KENT ISLAND THAT WAS MOVING EAST AT 10 
TO 15 MPH. AT THAT SPEED...THE THUNDERSTORM WILL BE NEAR CHESTER 
AROUND 910 PM...GRASONVILLE AROUND 925 PM AND QUEENSTOWN AROUND 935 
PM.

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO 
POND ON ROADS AND QUICKLY FILL ANY POOR DRAINAGE AREAS.

AS THE STORM INTENSIFIES...IT MAY GENERATE DANGEROUS CLOUD TO GROUND 
LIGHTNING AND WIND GUSTS TO 40 MPH. IF YOU HEAR THUNDER OR SEE 
LIGHTNING...PLEASE MOVE INDOORS. 

LAT...LON 3895 7637 3904 7632 3905 7629 3899 7627
      3898 7622 3900 7618 3904 7619 3904 7610
      3888 7613 3886 7621 3893 7622 3894 7624
      3890 7625 3892 7628 3889 7627 3890 7632
      3888 7633 3888 7638

$$

MPD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 2:21 AM EDT	Special Marine Warning	PHI		84 min
Jul 20, 3:01 AM EDT	Special Weather Statement	PHI	Cape May	59 min
Jul 20, 5:43 AM EDT	Special Weather Statement	PHI	Camden	92 min
Jul 20, 5:44 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	63 min
Jul 20, 7:28 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington	3 hr
Jul 20, 7:56 AM EDT	Areal Flood Advisory	PHI	Cape May	2 hr
Jul 20, 8:52 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Ocean	3 hr
Jul 20, 1:20 PM EDT	Special Weather Statement	PHI	Ocean	55 min
Jul 20, 3:16 PM EDT	Coastal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Middlesex, Monmouth and 1 more	9 hr
Jul 19, 10:01 PM EDT	Special Weather Statement	PHI	Berks	59 min
Jul 20, 5:03 AM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	105 min
Jul 19, 10:58 PM EDT	Special Weather Statement	PHI	Kent, New Castle, Sussex	2 hr
Jul 20, 1:58 AM EDT	Special Weather Statement	PHI	Sussex	62 min

Nearby

Special Weather Statements in Maryland, 2012 Every 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.