Alert archive / Maryland / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

April 29, 2017Queen Anne's County, Maryland; Kent County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Apr 29, 2017, 2:57 AM EDT for Queen Anne's County, Maryland; Kent County, Delaware. It was in force for 48 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 29, 2017, 2:57 AM EDT (06:57 UTC)
Expired: Apr 29, 2017, 3:45 AM EDT
In force: 48 min
Issued by: NWS Philadelphia/Mount Holly

Counties Kent County, DE, Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 35 km from the middle of the area, began a volume at 06:57 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, 7.0 hours before the alert went out and 131 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: 1170 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 934 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

As transmitted.

671 
WWUS81 KPHI 290657
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
257 AM EDT SAT APR 29 2017

DEZ002-MDZ012-015-020-290745-
Kent-Queen Anne's-Kent-Caroline-
257 AM EDT SAT APR 29 2017

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL KENT...CENTRAL QUEEN
ANNE'S...NORTHEASTERN CAROLINE AND SOUTHWESTERN KENT COUNTIES...

At 256 AM EDT, a strong thunderstorm was located over Centerville,
moving east at 55 mph.

Winds in excess of 40 mph and pea size hail are possible with this
storm.

Locations impacted include...
Dover, Centerville, Centreville, Camden, Greensboro, Oakland,
Ridgely, Church Hill, Bowers, Goldsboro, Woodside, Viola, Hartly,
Rising Sun-Lebanon, Starr, Jumptown, Hazlettville, Dover Base
Housing, Dover Speedway and Sandtown.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 3920 7541 3919 7541 3921 7540 3915 7541
      3911 7540 3907 7541 3903 7534 3896 7531
      3895 7618 3898 7619 3900 7617 3902 7621
      3911 7624
TIME...MOT...LOC 0656Z 264DEG 47KT 3904 7603 

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 2:54 AM EDT	Special Weather Statement	PHI	Burlington	36 min
Apr 29, 4:14 AM EDT	Special Weather Statement	PHI	Hunterdon, Middlesex, Somerset	46 min
Apr 29, 4:20 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Somerset	40 min
Apr 29, 4:22 AM EDT	Special Weather Statement	PHI	Burlington, Camden, Gloucester	38 min
Apr 29, 4:29 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	4 hr
Apr 29, 4:32 AM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset	43 min
Apr 29, 4:56 AM EDT	Special Marine Warning	PHI		64 min
Apr 29, 4:56 AM EDT	Special Weather Statement	PHI	Burlington, Mercer, Monmouth, Ocean	49 min
Apr 29, 5:16 AM EDT	Special Marine Warning	PHI		29 min
Apr 29, 6:16 AM EDT	Special Marine Warning	PHI		29 min
Apr 29, 7:04 AM EDT	Areal Flood Warning	PHI	Hunterdon, Somerset	4 hr
Apr 29, 3:12 AM EDT	Areal Flood Advisory	PHI	Berks	4 hr
Apr 29, 3:20 AM EDT	Special Weather Statement	PHI	Berks, Lehigh, Northampton	40 min
Apr 29, 3:51 AM EDT	Special Weather Statement	PHI	Berks, Bucks, Chester, Delaware, Montgomery	39 min
Apr 29, 3:39 AM EDT	Special Weather Statement	PHI	Caroline	36 min

Nearby

Special Weather Statements in Maryland, 2017 Special Weather Statements in Delaware, 2017 Every 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.