Alert archive / Maryland / Special Weather Statements in 2017

Special Weather Statement, NWS Philadelphia/Mount Holly

July 17, 2017Caroline County, Queen Anne's County, Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Jul 17, 2017, 6:49 PM EDT for Caroline County, Queen Anne's County, Talbot County, Maryland. It was in force for 56 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: Jul 17, 2017, 6:49 PM EDT (22:49 UTC)
Expired: Jul 17, 2017, 7:45 PM EDT
In force: 56 min
Issued by: NWS Philadelphia/Mount Holly

Counties Caroline County, MD, Queen Anne's County, MD, Talbot County, MD

The radar

The Dover AFB radar (KDOX), 48 km from the middle of the area, began a volume at 22:50 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
Jul 17, 6:52 PM EDT	HAIL 0.75	Centreville, MD	ALONG WITH OVER 2 INCHES OF RAIN

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, 10.8 hours before the alert went out and 108 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: 322 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1101 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

167 
WWUS81 KPHI 172249
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
649 PM EDT MON JUL 17 2017

DEZ002-003-MDZ012-015-019-020-172345-
Inland Sussex-Kent-Queen Anne's-Talbot-Kent-Caroline-
649 PM EDT MON JUL 17 2017

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

At 649 PM EDT, a strong thunderstorm was located over Starr, or near
Centerville, moving south at 25 mph.

Winds up to 40 mph and dime size hail are possible with this storm.

Locations impacted include...
Easton, Centerville, Seaford, Denton, Centreville, Federalsburg,
Greensboro, Oakland, Ridgely, Trappe, Preston, Oxford, Goldsboro,
Queen Anne, Smithville, Grasonville, Starr, Copperville, Jumptown and
Agner.

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

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

LAT...LON 3900 7617 3901 7621 3908 7621 3910 7568
      3860 7562 3860 7571 3865 7571 3869 7577
      3868 7580 3871 7584 3868 7594 3861 7598
      3861 7607 3864 7615 3868 7617 3868 7620
      3883 7619 3897 7622
TIME...MOT...LOC 2249Z 357DEG 22KT 3899 7605 

$$

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 3:56 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	4 hr
Jul 17, 4:16 PM EDT	Special Weather Statement	PHI	Gloucester	44 min
Jul 17, 4:35 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	115 min
Jul 17, 4:40 PM EDT	Special Weather Statement	PHI	Warren	65 min
Jul 17, 4:44 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	3 hr
Jul 17, 5:00 PM EDT	Special Weather Statement	PHI	Warren	30 min
Jul 17, 5:31 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	119 min
Jul 17, 5:51 PM EDT	Special Weather Statement	PHI	Hunterdon	39 min
Jul 17, 6:12 PM EDT	Special Weather Statement	PHI	Morris	33 min
Jul 17, 6:33 PM EDT	Flash Flood Warning	PHI	Morris	117 min
Jul 17, 6:39 PM EDT	Special Weather Statement	PHI	Hunterdon	51 min
Jul 17, 6:44 PM EDT	Special Weather Statement	PHI	Morris	46 min
Jul 17, 1:09 PM EDT	Special Weather Statement	PHI	Lehigh	36 min
Jul 17, 1:20 PM EDT	Severe Thunderstorm Warning	PHI	Berks	40 min
Jul 17, 1:24 PM EDT	Areal Flood Advisory	PHI	Berks	5 hr
Jul 17, 1:41 PM EDT	Flash Flood Warning	PHI	Berks	7 hr
Jul 17, 1:57 PM EDT	Special Weather Statement	PHI	Lebanon	33 min
Jul 17, 3:16 PM EDT	Areal Flood Advisory	PHI	Berks	119 min
Jul 17, 4:24 PM EDT	Special Weather Statement	PHI	Northampton	51 min
Jul 17, 4:56 PM EDT	Special Weather Statement	PHI	Philadelphia	49 min
Jul 17, 4:57 PM EDT	Special Weather Statement	PHI	Chester	33 min
Jul 17, 5:55 PM EDT	Special Weather Statement	PHI	Chester	50 min
Jul 17, 4:46 PM EDT	Areal Flood Advisory	PHI	Cecil, Kent	119 min
Jul 17, 4:52 PM EDT	Special Weather Statement	PHI	Cecil	53 min
Jul 17, 5:11 PM EDT	Special Weather Statement	PHI	Kent	49 min
Jul 17, 5:19 PM EDT	Special Weather Statement	PHI	Cecil	56 min
Jul 17, 6:13 PM EDT	Areal Flood Advisory	PHI	Kent, Queen Anne's	2 hr
Jul 17, 6:16 PM EDT	Special Weather Statement	PHI	Queen Anne's	44 min

Nearby

Special Weather Statements in Maryland, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.