Alert archive / Maryland / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

August 26, 2012Caroline County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 26, 2012, 8:44 PM EDT for Caroline County, Maryland. It was in force for 91 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 26, 2012, 8:44 PM EDT (00:44 UTC)
Expired: Aug 26, 2012, 10:15 PM EDT
In force: 91 min
Issued by: NWS Philadelphia/Mount Holly

County Caroline County, MD

The radar

The Dover AFB radar (KDOX), 40 km from the middle of the area, began a volume at 00:45 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 0.7 hours before the alert went out and 97 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: 1351 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 833 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

150 
WWUS81 KPHI 270044
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
844 PM EDT SUN AUG 26 2012

MDZ020-270215-
CAROLINE MD-
844 PM EDT SUN AUG 26 2012

...THUNDERSTORMS PRODUCING HEAVY RAINFALL IN SOUTHERN CAROLINE
COUNTY...

THUNDERSTORMS WITH HEAVY RAINFALL WILL CONTINUE TO SPREAD INTO 
SOUTHERN CAROLINE COUNTY THIS EVENING FROM THE SOUTHWEST.

THE HEAVY RAIN WILL CAUSE PONDING OF WATER ON ROADWAYS. IT WILL ALSO 
RESULT IN REDUCED VISIBILITY. IF YOU WILL BE DRIVING, BE SURE TO 
LEAVE PLENTY OF ROOM BETWEEN YOUR VEHICLE ON THE ONE AHEAD OF YOU.

THE THUNDERSTORMS MAY BE ACCOMPANIED BY WIND GUSTS AROUND 35 MPH 
ALONG WITH DANGEROUS CLOUD TO GROUND LIGHTNING. IF YOU OBSERVE 
THREATENING WEATHER, SEEK SHELTER AT ONCE.

LAT...LON 3868 7576 3867 7580 3870 7581 3870 7584
      3867 7595 3870 7598 3870 7600 3871 7599
      3873 7602 3878 7596 3878 7595 3881 7590
      3881 7572 3865 7571

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 10:07 AM EDT	Special Weather Statement	PHI	Somerset	23 min
Aug 27, 10:25 AM EDT	Special Weather Statement	PHI	Middlesex, Somerset	35 min
Aug 27, 10:34 AM EDT	Special Weather Statement	PHI	Camden, Mercer	26 min
Aug 27, 10:57 AM EDT	Special Weather Statement	PHI	Union	33 min
Aug 27, 11:03 AM EDT	Special Weather Statement	PHI	Union	12 min
Aug 27, 11:12 AM EDT	Special Weather Statement	PHI	Burlington, Camden	48 min
Aug 27, 11:32 AM EDT	Special Weather Statement	PHI	Middlesex	28 min
Aug 27, 11:54 AM EDT	Special Weather Statement	PHI	Atlantic	36 min
Aug 27, 12:03 PM EDT	Special Weather Statement	PHI	Middlesex, Monmouth	42 min
Aug 27, 12:30 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Ocean	2 hr
Aug 27, 12:50 PM EDT	Special Weather Statement	PHI	Monmouth	40 min
Aug 27, 1:12 PM EDT	Special Marine Warning	PHI		80 min
Aug 27, 1:32 PM EDT	Special Weather Statement	PHI	Atlantic, Ocean	58 min
Aug 27, 2:28 PM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Middlesex, Monmouth	2 hr
Aug 27, 3:28 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Somerset	69 min
Aug 27, 3:59 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Middlesex, Morris, Somerset, Sussex	72 min
Aug 27, 5:08 AM EDT	Special Weather Statement	PHI	Chester	52 min
Aug 27, 6:41 AM EDT	Special Weather Statement	PHI	Chester, Montgomery	49 min
Aug 27, 8:25 AM EDT	Special Weather Statement	PHI	Bucks, Delaware, Montgomery, Philadelphia	65 min
Aug 27, 10:00 AM EDT	Special Weather Statement	PHI	Philadelphia	30 min
Aug 27, 11:46 AM EDT	Areal Flood Advisory	PHI	Sussex	119 min
Aug 27, 1:40 PM EDT	Areal Flood Advisory	PHI	Sussex	57 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.