Alert archive / Maryland / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

July 19, 2012Kent County, New Castle County, Sussex County, Delaware; 5 counties in Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 19, 2012, 10:58 PM EDT for Kent County, New Castle County, Sussex County, Delaware; 5 counties in Maryland. It was in force for 2 hr. 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, 10:58 PM EDT (02:58 UTC)
Expired: Jul 20, 2012, 1:00 AM EDT
In force: 2 hr
Issued by: NWS Philadelphia/Mount Holly

Counties Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 39 km from the middle of the area, began a volume at 03:02 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, 3.0 hours before the alert went out and 118 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: 1571 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1208 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

236 
WWUS81 KPHI 200258
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1058 PM EDT THU JUL 19 2012

DEZ001>004-MDZ008-012-015-019-020-200500-
CAROLINE MD-CECIL MD-DELAWARE BEACHES DE-INLAND SUSSEX DE-KENT DE-
KENT MD-NEW CASTLE DE-QUEEN ANNE'S MD-TALBOT MD-
1058 PM EDT THU JUL 19 2012

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

AT 1053 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 10 MILES NORTHEAST
OF BALTIMORE TO 38 MILES WEST OF EASTON...MOVING EAST AT 25 MPH. THE
THUNDERSTORMS WILL BE NEAR PORT DEPOSIT...WOODLAWN AROUND 1130 PM...
BETTERTON...PERRYVILLE AROUND 1145 PM...KENNEDYVILLE...HOLLYWOOD
BEACH AROUND MIDNIGHT...GALENA...CECILTON AROUND 1215 AM...MILLINGTON
AND MASSEY AROUND 1230 AM.

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 40 MPH ARE POSSIBLE WITH THESE STORMS.

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.

LAT...LON 3845 7569 3870 7584 3857 7603 3867 7635
      3887 7625 3881 7621 3882 7620 3894 7624
      3884 7638 3904 7632 3900 7618 3917 7629
      3952 7599 3971 7621 3973 7551 3946 7558
      3892 7530 3880 7508 3845 7504 3844 7505

$$

NIERENBERG

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 20, 1:58 AM EDT	Special Weather Statement	PHI	Sussex	62 min
Jul 19, 9:07 PM EDT	Special Weather Statement	PHI	Queen Anne's	53 min

Nearby

Special Weather Statements in Maryland, 2012 Special Weather Statements in Delaware, 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.