Alert archive / Massachusetts / Tornado Warnings in 2018

Tornado Warning 15, NWS Boston/Norton, MA

October 29, 2018Barnstable County, Dukes County, Massachusetts

NWS Boston/Norton, MA issued this tornado warning at Oct 29, 2018, 9:34 AM EDT for Barnstable County, Dukes County, Massachusetts. It was in force for 41 min. 4 reports 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: Oct 29, 2018, 9:34 AM EDT (13:34 UTC)
Expired: Oct 29, 2018, 10:15 AM EDT
In force: 41 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Barnstable County, MA, Dukes County, MA

The radar

The Boston radar (KBOX), 65 km from the middle of the area, began a volume at 13:36 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
Oct 29, 9:52 AM EDT	TSTM WND DMG	Woods Hole, MA	TREE DOWN ON OYSTER POND ROAD
Oct 29, 9:52 AM EDT	TSTM WND GST 56	Woods Hole, MA	WOODS HOLE YACHT CLUB
Oct 29, 9:56 AM EDT	TSTM WND GST 56	Woods Hole, MA	WOODS HOLE YACHT CLUB
Oct 29, 9:58 AM EDT	TORNADO	Woods Hole, MA	A WATERSPOUT IN VINEYARD SOUND MOVED ONSHORE IN WOODS HOLE, MA AND THEN QUICKLY DISSIPATED. AN EYEWITNESS AT THE WOODS HOLE GOLF CLUB SAW FOUR WOODEN CHAIRS LOFTED AND SWIRLING IN THE AIR AND THEY ENDED UP 500 FEET AWAY. IT WAS AN EF-0, WITH WINDS OF 60-65 MPH

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 1.6 hours before the alert went out and 64 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: 6 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 744 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

554 
WFUS51 KBOX 291334
TORBOX
MAC001-007-291415-
/O.NEW.KBOX.TO.W.0015.181029T1334Z-181029T1415Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Boston/Norton MA
934 AM EDT MON OCT 29 2018

The National Weather Service in Boston/Norton has issued a

* Tornado Warning for...
  Central Dukes County in southeastern Massachusetts...
  Southwestern Barnstable County in southeastern Massachusetts...

* Until 1015 AM EDT.
    
* At 934 AM EDT, a severe thunderstorm capable of producing a tornado
  was located near Gosnold, or near Aquinnah, moving northeast at 40
  mph.

  HAZARD...Tornado and quarter size hail.

  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...
  Tisbury and West Tisbury around 945 AM EDT.
  Falmouth around 1000 AM EDT.
  Mashpee around 1010 AM EDT.
  Barnstable, Sandwich and Bourne around 1015 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.

&&

LAT...LON 4136 7081 4137 7078 4143 7072 4145 7075
      4142 7085 4146 7087 4147 7082 4158 7065
      4161 7066 4169 7055 4161 7040 4154 7048
      4154 7059 4146 7074 4144 7072 4149 7060
      4149 7057 4130 7078
TIME...MOT...LOC 1334Z 224DEG 35KT 4143 7078 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Frank

1 follow-up statement

931 
WWUS51 KBOX 291400
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
1000 AM EDT MON OCT 29 2018

MAC007-291409-
/O.CAN.KBOX.TO.W.0015.000000T0000Z-181029T1415Z/
Dukes MA-
1000 AM EDT MON OCT 29 2018

...THE TORNADO WARNING FOR CENTRAL DUKES COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has !** 
weakened. moved out of the warned area. Therefore, the warning has 
been cancelled.

LAT...LON 4131 7079 4143 7083 4150 7069 4161 7066
      4169 7055 4161 7040 4154 7048 4151 7064
      4147 7066 4148 7058 4145 7062 4143 7073
      4147 7067 4149 7068 4143 7080 4140 7075
      4143 7071 4131 7077
TIME...MOT...LOC 1359Z 224DEG 44KT 4157 7061 

$$

MAC001-291415-
/O.CON.KBOX.TO.W.0015.000000T0000Z-181029T1415Z/
Barnstable MA-
1000 AM EDT MON OCT 29 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 AM EDT FOR
SOUTHWESTERN BARNSTABLE COUNTY...
    
At 959 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Falmouth, moving northeast at 40 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...
  Mashpee around 1010 AM EDT.
  Barnstable, Sandwich and Bourne around 1015 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.

&&

LAT...LON 4131 7079 4143 7083 4150 7069 4161 7066
      4169 7055 4161 7040 4154 7048 4151 7064
      4147 7066 4148 7058 4145 7062 4143 7073
      4147 7067 4149 7068 4143 7080 4140 7075
      4143 7071 4131 7077
TIME...MOT...LOC 1359Z 224DEG 44KT 4157 7061 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

Frank

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 29, 7:44 AM EDT	Special Marine Warning	BOX		31 min
Oct 29, 7:52 AM EDT	Special Marine Warning	BOX		23 min
Oct 29, 8:08 AM EDT	Special Marine Warning	BOX		37 min
Oct 29, 8:09 AM EDT	Special Marine Warning	BOX		36 min
Oct 29, 8:31 AM EDT	Special Marine Warning	BOX		29 min
Oct 29, 8:34 AM EDT	Special Marine Warning	BOX		26 min
Oct 29, 8:50 AM EDT	Special Marine Warning	BOX		25 min
Oct 29, 8:58 AM EDT	Special Marine Warning	BOX		47 min
Oct 29, 9:03 AM EDT	Severe Thunderstorm Warning	BOX	Dukes	57 min
Oct 29, 9:12 AM EDT	Special Weather Statement	BOX	Bristol	33 min
Oct 29, 9:23 AM EDT	Special Marine Warning	BOX		37 min
Oct 29, 9:31 AM EDT	Severe Thunderstorm Warning	BOX	Bristol, Plymouth	15 min
Oct 29, 9:55 AM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Suffolk	22 min
Oct 29, 9:57 AM EDT	Special Marine Warning	BOX		33 min
Oct 29, 10:08 AM EDT	Tornado Warning	BOX	Barnstable	25 min
Oct 29, 10:14 AM EDT	Special Marine Warning	BOX		61 min
Oct 29, 10:14 AM EDT	Special Weather Statement	BOX	Essex	46 min
Oct 29, 10:16 AM EDT	Special Marine Warning	BOX		59 min
Oct 29, 10:21 AM EDT	Severe Thunderstorm Warning	BOX	Barnstable	39 min
Oct 29, 10:32 AM EDT	Special Weather Statement	BOX	Barnstable	28 min
Oct 29, 10:44 AM EDT	Special Marine Warning	BOX		31 min
Oct 29, 12:38 PM EDT	Special Weather Statement	BOX	Norfolk	22 min
Oct 29, 1:24 PM EDT	Special Marine Warning	BOX		21 min
Oct 29, 1:37 PM EDT	Special Weather Statement	BOX	Suffolk	23 min
Oct 29, 1:38 PM EDT	Special Marine Warning	BOX		16 min

Nearby

Tornado Warnings in Massachusetts, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.