Alert archive / Rhode Island / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 42, NWS Boston/Norton, MA

July 1, 2012Washington County, Rhode Island

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 1, 2012, 6:35 PM EDT for Washington County, Rhode Island. It was in force for 25 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 1, 2012, 6:35 PM EDT (22:35 UTC)
Expired: Jul 1, 2012, 7:00 PM EDT
In force: 25 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 22:36 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
Jul 1, 6:48 PM EDT	HAIL 0.75	Block Island, RI

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
Jul 1, 1:35 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.6 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: 254 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1757 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

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

990 
WUUS51 KBOX 012235
SVRBOX
RIC009-012300-
/O.NEW.KBOX.SV.W.0042.120701T2235Z-120701T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
635 PM EDT SUN JUL 1 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

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

* UNTIL 700 PM EDT

* AT 631 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN
  EXCESS OF 60 MPH. THIS STORM WAS LOCATED 7 MILES NORTHWEST OF
  BLOCK ISLAND...MOVING SOUTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BLOCK ISLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR
PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY. LIGHTNING IS ONE OF NATURES LEADING KILLERS. REMEMBER...
IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING.

&&

LAT...LON 4116 7161 4118 7161 4121 7158 4122 7157
      4121 7156 4118 7157 4117 7155 4116 7155
      4115 7155 4115 7160
TIME...MOT...LOC 2231Z 293DEG 24KT 4122 7170 

$$

EVT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 3:04 PM EDT	Severe Thunderstorm Warning	BOX	Providence	41 min
Jul 1, 3:38 PM EDT	Severe Thunderstorm Warning	BOX	Kent, Providence, Washington	52 min
Jul 1, 3:44 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Kent, Newport, Providence	46 min
Jul 1, 4:10 PM EDT	Severe Thunderstorm Warning	BOX	Washington	35 min
Jul 1, 4:27 PM EDT	Severe Thunderstorm Warning	BOX	Kent, Washington	24 min
Jul 1, 4:34 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Kent, Newport, Providence	41 min
Jul 1, 6:24 PM EDT	Special Weather Statement	BOX	Washington	36 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.