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September Discobs Thread


George BM

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About time:

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MESOSCALE DISCUSSION 1469
NWS STORM PREDICTION CENTER NORMAN OK
0225 PM CDT MON SEP 17 2018

AREAS AFFECTED...CENTRAL/SOUTHEAST VA...SOUTHERN/CENTRAL MD
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 

VALID 171925Z - 172130Z

PROBABILITY OF WATCH ISSUANCE...60 PERCENT

SUMMARY...THE BRIEF TORNADO THREAT WILL SPREAD NORTHEASTWARD WITH
TIME THIS AFTERNOON INTO AREAS NEAR AND SOUTHEAST OF DC. TORNADO
WATCH ISSUANCE IS POSSIBLE.

DISCUSSION...AT 19Z, THE REMNANT SURFACE CIRCULATION ASSOCIATED WITH
TD FLORENCE WAS LOCATED NEAR THE OH/WV BORDER, WITH A PRONOUNCED
MIDLEVEL DRY SLOT NOTED ON WV IMAGERY TO THE SOUTHEAST OF THE
CENTER. A DIFFERENTIAL HEATING ZONE/EFFECTIVE WARM FRONT IS NOTED
FROM THE EASTERN WV PANHANDLE SOUTHEAST INTO PORTIONS OF CENTRAL VA
AND SOUTHERN MD. CONVECTION NEAR THE FRONTAL ZONE HAS DISPLAYED
OCCASIONAL ROTATION, AND A FEW BRIEF TDSS HAVE BEEN NOTED OVER THE
PAST FEW HOURS. AS THE BOUNDARY SHIFTS NORTHWARD WITH TIME, MLCAPE
OF 1000-1500 J/KG, 0-1 KM SHEAR OF 20-30 KT, AND 0-1 KM SRH OF
200-300 M2/S2 WILL CONTINUE TO SUPPORT AT LEAST TRANSIENT LOW-LEVEL
MESOCYCLONES, WITH AN ATTENDANT THREAT OF BRIEF TORNADOES AND
PERHAPS DAMAGING WIND GUSTS. 

THE MAIN CORRIDOR OF THREAT SHOULD SHIFT NORTHEASTWARD THIS
AFTERNOON, INTO AREAS NEAR AND SOUTH OF DC. GIVEN THE POTENTIAL FOR
A FEW DISCRETE CELLS WITH AT LEAST A TRANSIENT TORNADO THREAT, WATCH
ISSUANCE IS POSSIBLE. A SMALL SLIGHT RISK WILL ALSO BE ADDED IN THE
FORTHCOMING 20Z DAY 1 OUTLOOK.



..DEAN/HART.. 09/17/2018

 

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Severe Weather Statement
National Weather Service Wakefield VA
336 PM EDT MON SEP 17 2018

VAC041-171945-
/O.CON.KAKQ.TO.W.0028.000000T0000Z-180917T1945Z/
Chesterfield VA-
336 PM EDT MON SEP 17 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 345 PM EDT FOR CENTRAL
CHESTERFIELD COUNTY...

At 336 PM EDT, a confirmed tornado was located 7 miles east of
Moseley, moving north at 20 mph.

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

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.

Locations impacted include...
Beach and Midlothian.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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.
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BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Wakefield VA
339 PM EDT MON SEP 17 2018

The National Weather Service in Wakefield has issued a

* Tornado Warning for...
  The City of Richmond in central Virginia...
  North central Chesterfield County in central Virginia...
  West central Henrico County in central Virginia...

* Until 415 PM EDT.

* At 339 PM EDT, a tornado producing storm was located 7 miles west
  of Chesterfield Court House, or 7 miles east of Moseley, moving
  north at 20 mph.

  HAZARD...Damaging tornado.

  SOURCE...Radar confirmed tornado.

  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 tornadic storm will be near...
  Bon Air around 405 PM EDT.
  University Of Richmond and Downtown Richmond around 410 PM EDT.
  Richmond, Tuckahoe and Virginia Commonwealth University around 415
  PM EDT.

Other locations impacted by this tornadic thunderstorm include
Pocahontas State Park, Roslyn Hills and Midlothian.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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.
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BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Baltimore MD/Washington DC
338 PM EDT MON SEP 17 2018

The National Weather Service in Sterling Virginia has issued a

* Tornado Warning for...
  West central Charles County in southern Maryland...
  East central Stafford County in northern Virginia...

* Until 415 PM EDT.

* At 338 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Aquia Creek, moving northeast at 25 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...For those in the direct path of a tornado touchdown,
           flying debris will be dangerous to those caught without
           shelter. Damage to roofs, siding, and windows may occur.
           Mobile homes may be damaged or destroyed. Tree damage is
           likely.

* This dangerous storm will be near...
  Aquia Creek around 345 PM EDT.

Other locations impacted by this tornadic thunderstorm include
Brooke, Nanjemoy, Widewater and Arkendale.
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TORNADO WATCH OUTLINE UPDATE FOR WT 382
NWS STORM PREDICTION CENTER NORMAN OK
340 PM EDT MON SEP 17 2018

TORNADO WATCH 382 IS IN EFFECT UNTIL 1000 PM EDT FOR THE
 FOLLOWING LOCATIONS

MDC003-009-017-033-037-180200-
/O.NEW.KWNS.TO.A.0382.180917T1940Z-180918T0200Z/

MD
.    MARYLAND COUNTIES INCLUDED ARE

ANNE ARUNDEL         CALVERT             CHARLES
PRINCE GEORGES       ST. MARYS

-----------------------------------------------------------------------------------------------

TORNADO WATCH OUTLINE UPDATE FOR WT 382
NWS STORM PREDICTION CENTER NORMAN OK
340 PM EDT MON SEP 17 2018

TORNADO WATCH 382 IS IN EFFECT UNTIL 1000 PM EDT FOR THE
 FOLLOWING LOCATIONS

VAC007-013-033-041-049-057-059-075-085-087-097-099-101-109-127-
145-153-159-177-179-193-510-600-610-630-683-685-760-180200-
/O.NEW.KWNS.TO.A.0382.180917T1940Z-180918T0200Z/

VA
.    VIRGINIA COUNTIES INCLUDED ARE

AMELIA               ARLINGTON           CAROLINE
CHESTERFIELD         CUMBERLAND          ESSEX
FAIRFAX              GOOCHLAND           HANOVER
HENRICO              KING AND QUEEN      KING GEORGE
KING WILLIAM         LOUISA              NEW KENT
POWHATAN             PRINCE WILLIAM      RICHMOND
SPOTSYLVANIA         STAFFORD            WESTMORELAND


VIRGINIA INDEPENDENT CITIES INCLUDED ARE

ALEXANDRIA           FAIRFAX             FALLS CHURCH
FREDERICKSBURG       MANASSAS            MANASSAS PARK
RICHMOND
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Severe Weather Statement
National Weather Service Wakefield VA
344 PM EDT MON SEP 17 2018

VAC041-087-760-172015-
/O.CON.KAKQ.TO.W.0031.000000T0000Z-180917T2015Z/
City of Richmond VA-Chesterfield VA-Henrico VA-
344 PM EDT MON SEP 17 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM EDT FOR NORTH
CENTRAL CHESTERFIELD AND WEST CENTRAL HENRICO COUNTIES AND THE CITY
OF RICHMOND...

At 343 PM EDT, a confirmed tornado was located near SR 288 and Hull
Street road, moving northeast at 20 mph.

HAZARD...Damaging tornado.

SOURCE...Weather spotters confirmed tornado.

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 tornado will be near...
  Bensley around 355 PM EDT.
  University Of Richmond, Bon Air and Downtown Richmond around 405
  PM EDT.
  Virginia Commonwealth University around 410 PM EDT.
  Richmond and Tuckahoe around 415 PM EDT.

Other locations impacted by this tornadic thunderstorm include
Pocahontas State Park, Roslyn Hills and Midlothian.
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Severe Weather Statement
National Weather Service Wakefield VA
347 PM EDT MON SEP 17 2018

VAC041-087-760-172015-
/O.CON.KAKQ.TO.W.0031.000000T0000Z-180917T2015Z/
City of Richmond VA-Chesterfield VA-Henrico VA-
347 PM EDT MON SEP 17 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM EDT FOR NORTH
CENTRAL CHESTERFIELD AND WEST CENTRAL HENRICO COUNTIES AND THE CITY
OF RICHMOND...

At 346 PM EDT, a confirmed tornado was located near SR 288 and Hull
Street road, moving north at 20 mph. A second potential tornado is
being observed on radar near Pochantas State Park.

HAZARD...Damaging tornado.

SOURCE...Weather spotters confirmed tornado.

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 tornado will be near...
  Bensley around 355 PM EDT.
  Bon Air, University Of Richmond and Downtown Richmond around 405
  PM EDT.
  Virginia Commonwealth University around 410 PM EDT.
  Richmond and Tuckahoe around 415 PM EDT.

Other locations impacted by this tornadic thunderstorm include Roslyn
Hills and Midlothian.
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Severe Weather Statement
National Weather Service Baltimore MD/Washington DC
355 PM EDT MON SEP 17 2018

MDC017-172015-
/O.CON.KLWX.TO.W.0018.000000T0000Z-180917T2015Z/
Charles MD-
355 PM EDT MON SEP 17 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM EDT FOR WEST
CENTRAL CHARLES COUNTY...

At 355 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Aquia Creek, moving northeast at 20 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...For those in the direct path of a tornado touchdown, flying
         debris will be dangerous to those caught without shelter.
         Damage to roofs, siding, and windows may occur. Mobile
         homes may be damaged or destroyed. Tree damage is likely.

This tornadic thunderstorm will remain over mainly rural areas of
west central Charles County, including the following locations...
Nanjemoy.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

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Severe Weather Statement
National Weather Service Wakefield VA
353 PM EDT MON SEP 17 2018

VAC041-087-760-172015-
/O.CON.KAKQ.TO.W.0031.000000T0000Z-180917T2015Z/
City of Richmond VA-Chesterfield VA-Henrico VA-
353 PM EDT MON SEP 17 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM EDT FOR NORTH
CENTRAL CHESTERFIELD AND WEST CENTRAL HENRICO COUNTIES AND THE CITY
OF RICHMOND...

At 352 PM EDT, a confirmed tornado was previously reported near SR
288 and Hull Street Road, moving north at 20 mph. A second potential
tornado is located southeast of Bon Air.

HAZARD...Damaging tornado.

SOURCE...Weather spotters confirmed tornado.

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 tornado will be near...
  Bon Air, University Of Richmond and Downtown Richmond around 405
  PM EDT.
  Virginia Commonwealth University around 410 PM EDT.
  Richmond and Tuckahoe around 415 PM EDT.
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Severe Weather Statement
National Weather Service Wakefield VA
401 PM EDT MON SEP 17 2018

VAC041-145-172030-
/O.CON.KAKQ.TO.W.0034.000000T0000Z-180917T2030Z/
Chesterfield VA-Powhatan VA-
401 PM EDT MON SEP 17 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM EDT FOR
NORTHWESTERN CHESTERFIELD AND SOUTHEASTERN POWHATAN COUNTIES...

At 401 PM EDT, a confirmed tornado was located near Moseley, moving
northeast at 25 mph.

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

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 tornado will be near...
  Tuckahoe around 430 PM EDT.

Other locations impacted by this tornadic thunderstorm include Holly
Hills, Flat Rock, Subletts, Genito, Clayville and Pilkinton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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.
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BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Wakefield VA
414 PM EDT MON SEP 17 2018

The National Weather Service in Wakefield has issued a

* Tornado Warning for...
  The City of Richmond in central Virginia...
  North central Chesterfield County in central Virginia...
  Northwestern Henrico County in central Virginia...
  Southeastern Hanover County in central Virginia...

* Until 445 PM EDT.

* At 412 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Virginia Union University, moving northeast at 25
  mph. This storm has a history of producing damaging tornadoes. A
  second circulation has developed near Bon Air as well.

  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...
  Highland Springs around 420 PM EDT.
  East Highland Park and Glen Allen around 425 PM EDT.
  Mechanicsville around 430 PM EDT.
  Hanover and Studley around 445 PM EDT.

Other locations impacted by this tornadic thunderstorm include
Solomons Store, Chamberlayne, Atlee, Ashcake, Greendale, Hanover
Airport, Dumbarton, Montrose and Longdale.
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