Alert archive / Maryland / Tornado Warnings in 2017

Tornado Warning 10, NWS Philadelphia/Mount Holly

August 11, 2017Talbot County, Maryland

NWS Philadelphia/Mount Holly issued this tornado warning at Aug 11, 2017, 11:16 PM EDT for Talbot County, Maryland. It was in force for 44 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 11, 2017, 11:16 PM EDT (03:16 UTC)
Expired: Aug 12, 2017, 12:00 AM EDT
In force: 44 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Talbot County, MD

The radar

The Dover AFB radar (KDOX), 69 km from the middle of the area, began a volume at 03:17 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 11, 11:59 PM EDT	TSTM WND DMG	1 W Trappe, MD	A TREE WAS TAKEN DOWN BY THUNDERSTORM WINDS ONTO WIRES.

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 00:00Z, 3.3 hours before the alert went out and 116 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: 50 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 692 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

620 
WFUS51 KPHI 120316
TORPHI
MDC041-120400-
/O.NEW.KPHI.TO.W.0010.170812T0316Z-170812T0400Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
1116 PM EDT FRI AUG 11 2017

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  Central Talbot County in eastern Maryland...

* Until midnight EDT
    
* At 1115 PM EDT, a severe thunderstorm capable of producing a
  tornado was located near Tilghman Island, or 9 miles east of Breezy
  Point, moving northeast at 15 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Tilghman Island around 1130 PM EDT. 
  St. Michaels and Oxford around 1150 PM EDT. 
  Easton, Trappe, Copperville and Hambleton around 1200 AM EDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3878 7633 3881 7622 3879 7622 3879 7619
      3882 7619 3884 7614 3866 7604 3862 7612
      3868 7617 3867 7620 3871 7624 3876 7622
      3872 7628 3871 7627 3872 7630 3878 7629
      3876 7632 3867 7634
TIME...MOT...LOC 0315Z 245DEG 14KT 3867 7635 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Robertson

1 follow-up statement

590 
WWUS51 KPHI 120333
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1133 PM EDT FRI AUG 11 2017

MDC041-120400-
/O.CON.KPHI.TO.W.0010.000000T0000Z-170812T0400Z/
Talbot MD-
1133 PM EDT FRI AUG 11 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EDT FOR SOUTH
CENTRAL TALBOT COUNTY...
    
At 1132 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Oxford, or 12 miles northwest of Cambridge, moving
east at 15 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This dangerous storm will be near...
  Oxford around 1155 PM EDT. 
  Trappe and Hambleton around 1200 AM EDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

If on or near Choptank River get away from the water and move to 
safe shelter immediately. If you can hear thunder, you are close 
enough to be struck by lightning. Severe thunderstorms can produce 
large capsizing waves, even on small bodies of water. Move into dock 
and seek safe shelter now! Do not be caught on the water in a 
thunderstorm.

&&

LAT...LON 3874 7608 3866 7604 3862 7612 3868 7617
      3869 7619 3867 7620 3868 7621 3871 7622
      3870 7623 3872 7624
TIME...MOT...LOC 0332Z 270DEG 14KT 3866 7627 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 10:53 PM EDT	Special Weather Statement	PHI	Talbot	37 min
Aug 11, 11:11 PM EDT	Severe Thunderstorm Warning	PHI	Talbot	49 min
Aug 11, 11:31 PM EDT	Areal Flood Advisory	PHI	Caroline, Talbot	4 hr
Aug 11, 11:53 PM EDT	Tornado Warning	PHI	Talbot	37 min
Aug 12, 12:41 AM EDT	Special Weather Statement	PHI	Wicomico	34 min
Aug 12, 12:25 PM EDT	Areal Flood Advisory	PHI	Caroline	4 hr

Nearby

Tornado Warnings in Maryland, 2017 Every tornado warning in 2017 Tornadoes 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.