Alert archive / Maryland / Special Weather Statements in 2013

Special Weather Statement, NWS Philadelphia/Mount Holly

April 19, 2013Kent County, New Castle County, Sussex County, Delaware; 5 counties in Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Apr 19, 2013, 7:13 PM EDT for Kent County, New Castle County, Sussex County, Delaware; 5 counties in Maryland. It was in force for 3 hr. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 19, 2013, 7:13 PM EDT (23:13 UTC)
Expired: Apr 19, 2013, 10:15 PM EDT
In force: 3 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), 41 km from the middle of the area, began a volume at 23:17 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.

What was reported inside it

Time	Report	Where	Remark
Apr 19, 8:15 PM EDT	TSTM WND DMG	Easton, MD	TREES DOWN
Apr 19, 8:15 PM EDT	TSTM WND DMG	Sudlersville, MD	TREE TOPS SNAPPED ON EAST MAIN STREET AND IN SUDLERSVILLE CEMETERY
Apr 19, 8:33 PM EDT	TSTM WND DMG	Elkton, MD	TREES DOWN
Apr 19, 8:38 PM EDT	TSTM WND GST 50	Glasgow, DE
Apr 19, 8:48 PM EDT	MARINE TSTM WIND 40	Delaware City, DE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 11.2 hours before the alert went out and 121 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: 10 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 696 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 127 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.

325 
WWUS81 KPHI 192313
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
713 PM EDT FRI APR 19 2013

DEZ001>004-MDZ008-012-015-019-020-200215-
CAROLINE MD-CECIL MD-DELAWARE BEACHES DE-INLAND SUSSEX DE-KENT DE-
KENT MD-NEW CASTLE DE-QUEEN ANNE'S MD-TALBOT MD-
713 PM EDT FRI APR 19 2013

...STRONG THUNDERSTORMS WILL AFFECT THE EASTERN SHORE OF 
MARYLAND...THEN DELAWARE THIS EVENING...

AT 705 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE 
OF STRONG TO SEVERE THUNDERSTORMS ON THE WESTERN SHORE OF MARYLAND 
MOVING EAST AT AROUND 30 MPH. THIS LINE OF THUNDERSTORMS IS EXPECTED 
TO MOVE ONTO THE EASTERN SHORE OF MARYLAND AROUND 800 PM...THEN INTO 
DELAWARE A LITTLE LATER. 

WIND GUSTS AROUND 50 MPH ARE POSSIBLE WITH THESE STORMS...ALONG WITH 
BRIEF HEAVY DOWNPOURS...AND CLOUD TO GROUND LIGHTNING. 


LAT...LON 3846 7570 3870 7583 3857 7602 3867 7635
      3887 7625 3881 7621 3882 7620 3894 7624
      3884 7639 3905 7631 3900 7618 3918 7628
      3952 7599 3972 7622 3980 7541 3947 7558
      3893 7530 3893 7532 3880 7508 3845 7505

$$

JJM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 10:52 AM EDT	Gale Warning	PHI		13 hr
Apr 19, 6:20 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Chester, Lehigh, Monroe, Northampton	3 hr
Apr 19, 7:45 PM EDT	Severe Thunderstorm Warning	PHI	Carbon	45 min
Apr 19, 7:53 PM EDT	Special Weather Statement	PHI	Bucks, Delaware, Montgomery, Philadelphia	3 hr
Apr 19, 7:29 PM EDT	Severe Thunderstorm Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	61 min

Nearby

Special Weather Statements in Maryland, 2013 Special Weather Statements in Delaware, 2013 Every special weather statement in 2013

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.