Alert archive / Maryland / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

April 21, 2017Caroline County, Maryland; Kent County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Apr 21, 2017, 9:00 PM EDT for Caroline County, Maryland; Kent County, Delaware. It was in force for 60 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
Apr 21, 2017, 9:00 PM EDT (01:00 UTC)
Expired
Apr 21, 2017, 10:00 PM EDT
In force
60 min
Issued by
NWS Philadelphia/Mount Holly

Counties Kent County, DE, Caroline County, MD

The radar

The Dover AFB radar (KDOX), 16 km from the middle of the area, began a volume at 01:01 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, 1.0 hours before the alert went out and 114 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 00:00Z on 2017-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 67 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 00:00Z on 2017-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 252 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
67 J/kg
Mixed-layer CIN
-186 J/kg
Mixed-layer LCL
914 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
252 m²/s²
0-3 km storm-relative helicity
325 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.0

Open this sounding in Storm Lab

The text

As transmitted.

932 
WWUS81 KPHI 220100
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
900 PM EDT FRI APR 21 2017

DEZ002-003-MDZ020-220200-
Inland Sussex-Kent-Caroline-
900 PM EDT FRI APR 21 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN SUSSEX...SOUTHERN
KENT AND EAST CENTRAL CAROLINE COUNTIES...

At 859 PM EDT, a strong thunderstorm was located over Denton, or 14
miles east of Easton, moving east at 30 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Go inside if threatening weather approaches. 

Locations impacted include...
Dover, Milford, Denton, Harrington, Greensboro, Oakland, Ridgely,
Bowers, Woodside, Viola, Rising Sun-Lebanon, Jumptown, Dover Base
Housing, Sandtown, Andrewsville, Harmony, Rising Sun, Griffin, Felton
and Greenwood.

LAT...LON 3876 7589 3895 7594 3897 7593 3914 7542
      3910 7540 3907 7541 3904 7536 3894 7531
      3893 7532 3890 7529 3883 7525
TIME...MOT...LOC 0059Z 256DEG 28KT 3885 7582 

$$

po

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 21, 8:17 PM EDTSevere Thunderstorm WarningPHICaroline, Queen Anne's, Talbot43 min

Nearby

Special Weather Statements in Maryland, 2017Special Weather Statements in Delaware, 2017Every special weather statement in 2017

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.