Alert archive / Delaware / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

August 9, 2021Sussex County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 9, 2021, 2:10 PM EDT for Sussex County, Delaware. It was in force for 50 min. 1 report 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: Aug 9, 2021, 2:10 PM EDT (18:10 UTC)
Expired: Aug 9, 2021, 3:00 PM EDT
In force: 50 min
Issued by: NWS Philadelphia/Mount Holly
Hail: 0.25 in
Wind: 40

County Sussex County, DE

The radar

The Dover AFB radar (KDOX), 4 km from the middle of the area, began a volume at 18:17 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
Aug 9, 2:40 PM EDT	TSTM WND DMG	Harrington, DE	TREES AND LARGE BRANCHES BLOWN DOWN. TIME ESTIMATED FROM RADAR.

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, 6.2 hours before the alert went out and 102 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: 927 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 869 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

055 
WWUS81 KPHI 091810
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
210 PM EDT Mon Aug 9 2021
 
DEZ002>004-091900-
Inland Sussex DE-Kent DE-Delaware Beaches DE-
210 PM EDT Mon Aug 9 2021

...Strong thunderstorms will impact portions of central Sussex and
southern Kent Counties through 300 PM EDT...

At 209 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Harrington to near Millville. Movement was
northeast at 20 mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects. Minor damage to outdoor objects is 
         possible.

Locations impacted include...
Georgetown, Milford, Millsboro, Harrington, Lewes, Milton, Dagsboro,
Ellendale, Bowers, Viola, Henlopen Acres, Cape Henlopen State Park,
Big Stone Beach, Andrewsville, Long Neck, Felton, Greenwood,
Frederica, Houston and Dewey Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3875 7554 3893 7574 3898 7573 3904 7564
      3906 7539 3876 7504 3851 7520
TIME...MOT...LOC 1809Z 217DEG 16KT 3897 7565 3860 7513 

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

$$

JEO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 3:43 PM EDT	Excessive Heat Watch	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 4 more	12 hr
Aug 9, 4:36 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland, Gloucester, Salem	104 min
Aug 9, 4:45 PM EDT	Special Weather Statement	PHI	Atlantic	30 min
Aug 9, 5:40 PM EDT	Areal Flood Advisory	PHI	Camden, Gloucester	82 min
Aug 9, 6:10 PM EDT	Special Weather Statement	PHI	Burlington	35 min
Aug 9, 6:37 PM EDT	Special Weather Statement	PHI	Mercer	38 min
Aug 9, 5:12 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware	85 min
Aug 9, 5:34 PM EDT	Special Weather Statement	PHI	Philadelphia	26 min
Aug 9, 6:24 PM EDT	Special Weather Statement	PHI	Lehigh	36 min
Aug 9, 6:29 PM EDT	Areal Flood Advisory	PHI	Berks, Montgomery	70 min
Aug 9, 6:49 PM EDT	Special Weather Statement	PHI	Montgomery	26 min
Aug 9, 7:14 PM EDT	Special Weather Statement	PHI	Carbon	31 min
Aug 9, 2:41 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle, Sussex	3 hr
Aug 9, 3:01 PM EDT	Flash Flood Warning	PHI	Kent, Sussex	2 hr
Aug 9, 4:35 PM EDT	Severe Thunderstorm Warning	PHI	Kent	40 min
Aug 9, 4:59 PM EDT	Flash Flood Warning	PHI	Kent	79 min
Aug 9, 5:12 PM EDT	Severe Thunderstorm Warning	PHI	Kent	20 min

Nearby

Special Weather Statements in Delaware, 2021 Every special weather statement in 2021

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.