Alert archive / Maryland / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

October 19, 2012Caroline County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Oct 19, 2012, 10:36 PM EDT for Caroline County, Maryland. It was in force for 54 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: Oct 19, 2012, 10:36 PM EDT (02:36 UTC)
Expired: Oct 19, 2012, 11:30 PM EDT
In force: 54 min
Issued by: NWS Philadelphia/Mount Holly

County Caroline County, MD

The radar

The Dover AFB radar (KDOX), 42 km from the middle of the area, began a volume at 02:38 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, 2.6 hours before the alert went out and 136 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: 167 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 918 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

496 
WWUS81 KPHI 200236
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1036 PM EDT FRI OCT 19 2012

DEZ001-002-MDZ015-020-200330-
CAROLINE MD-KENT DE-NEW CASTLE DE-QUEEN ANNE'S MD-
1036 PM EDT FRI OCT 19 2012

...STRONG THUNDERSTORMS WILL AFFECT CAROLINE...KENT...NEW CASTLE AND
QUEEN ANNE'S COUNTIES...

AT 1035 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR MILLINGTON TO 
QUEEN ANNE IN MARYLAND...MOVING NORTHEAST AT 40 MPH. THE 
THUNDERSTORMS WILL BE NEAR TOWNSEND AND SANDTOWN AROUND 1045 
PM...PORT PENN AND HAZLETTVILLE AROUND 1100 PM...AND WOODLAND BEACH 
AND DOVER AROUND 1115 PM.

VERY HEAVY RAIN WILL FALL FROM THESE STORMS...AND IT WILL CAUSE 
WATER TO POND ON ROADS AND QUICKLY FILL POOR DRAINAGE AREAS.

WIND GUSTS TO 40 MPH AND SMALL HAIL ARE POSSIBLE.

LAT...LON 3869 7599 3878 7597 3881 7590 3884 7593
      3887 7593 3924 7581 3925 7576 3935 7577
      3953 7557 3952 7555 3946 7558 3942 7553
      3937 7551 3932 7543 3923 7539 3870 7595

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 19, 9:36 PM EDT	Small Craft Advisory for Hazardous Seas	PHI		18 hr
Oct 19, 10:15 PM EDT	Special Weather Statement	PHI	Warren	60 min
Oct 20, 3:16 PM EDT	Small Craft Advisory	PHI		12 hr
Oct 19, 8:31 PM EDT	Special Weather Statement	PHI	Berks	44 min
Oct 19, 8:42 PM EDT	Severe Thunderstorm Warning	PHI	Berks	63 min
Oct 19, 8:59 PM EDT	Tornado Warning	PHI	Berks	31 min
Oct 19, 9:24 PM EDT	Special Weather Statement	PHI	Chester, Delaware, Montgomery	96 min
Oct 19, 10:00 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware	63 min
Oct 19, 10:27 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	63 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.