Alert archive / Rhode Island / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 80, NWS Boston/Norton, MA

August 10, 2012Washington County, Rhode Island

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 10, 2012, 3:41 PM EDT for Washington County, Rhode Island. It was in force for 19 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 10, 2012, 3:41 PM EDT (19:41 UTC)
Expired: Aug 10, 2012, 4:00 PM EDT
In force: 19 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

County Washington County, RI

The radar

The Boston radar (KBOX), 94 km from the middle of the area, began a volume at 19:44 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 10, 4:00 PM EDT	TSTM WND DMG	New Shoreham, RI	SEVERAL TREES DOWNED

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 10, 3:31 PM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 7.7 hours before the alert went out and 113 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: 1737 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 539 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

254 
WUUS51 KBOX 101941
SVRBOX
RIC009-102000-
/O.NEW.KBOX.SV.W.0080.120810T1941Z-120810T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
341 PM EDT FRI AUG 10 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTH CENTRAL WASHINGTON COUNTY IN RHODE ISLAND...

* UNTIL 400 PM EDT

* AT 335 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES SOUTH OF BLOCK ISLAND...
  AND WAS MOVING NORTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL MOVE ACROSS BLOCK ISLAND BETWEEN 350 
  PM AND 355 PM.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND LARGE HAIL...AS WELL
AS DEADLY LIGHTNING AND TORRENTIAL RAIN. GET TO SAFE SHELTER NOW...
INSIDE A STURDY BUILDING OR IN A VEHICLE. DO NOT SEEK SHELTER UNDER
TREES. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING. DRIVERS SHOULD BE ALERT FOR PONDING OF WATER AND AVOID
FLOODED ROADS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY EVENING FOR
NORTHERN CONNECTICUT AND SOUTHEASTERN MASSACHUSETTS AND CENTRAL RHODE
ISLAND.

&&

LAT...LON 4115 7162 4116 7162 4118 7162 4121 7158
      4123 7158 4124 7157 4122 7155 4118 7156
      4116 7153 4114 7156 4114 7160
TIME...MOT...LOC 1937Z 202DEG 33KT 4110 7161

$$

WTB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 3:10 PM EDT	Special Weather Statement	BOX	Bristol, Kent, Newport, Washington	50 min
Aug 10, 3:36 PM EDT	Areal Flood Advisory	BOX	Bristol, Kent, Newport, Providence, Washington	2 hr
Aug 10, 4:09 PM EDT	Severe Thunderstorm Warning	BOX	Newport, Washington	36 min
Aug 10, 4:43 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Kent, Newport, Washington	62 min
Aug 10, 4:56 PM EDT	Flash Flood Warning	BOX	Kent, Providence, Washington	2 hr
Aug 10, 4:57 PM EDT	Flash Flood Warning	BOX	Kent, Providence, Washington	2 hr
Aug 10, 5:16 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Newport	59 min
Aug 10, 5:33 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Kent, Providence	27 min

Nearby

Severe Thunderstorm Warnings in Rhode Island, 2012 Every severe thunderstorm warning in 2012

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.