Public Information Statement
Issued by NWS Boston, MA

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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
128 PM EDT WED APR 29 2015

...SEVERE WEATHER PREPAREDNESS WEEK - CHANGES TO OUTLOOKS...

THE NATIONAL WEATHER SERVICE HAS DECLARED THE WEEK OF APRIL 27 TO
MAY 1 AS SEVERE WEATHER PREPAREDNESS WEEK. THE FOLLOWING IS
THE THIRD IN A SERIES OF FIVE INFORMATIONAL STATEMENTS.

THE STORM PREDICTION CENTER /SPC/ IN NORMAN, OKLAHOMA ISSUES
WHAT ARE CALLED CONVECTIVE OUTLOOKS FOR THE NATION. THESE CAN
BE FOUND ON OUR WEBSITE AT WEATHER.GOV/BOSTON IN THE CURRENT
HAZARDS TAB AND THE THUNDERSTORMS SELECTION.  YOU MAY HAVE
NOTICED THAT THERE IS NOW MORE DETAIL IN THE DAY 1...2...AND 3
CONVECTIVE OUTLOOKS. THE PRIOR SYSTEM HAD 3 THRESHOLDS...SLIGHT...
MODERATE...AND HIGH AND THE NEW SYSTEM GIVES MORE DEFINITION WITH
5 THRESHOLDS. A MARGINAL CATEGORY HAS REPLACED THE SEE TEXT
SECTION IN THE PREVIOUS SYSTEM AND AN ENHANCED CATEGORY HAS NOW
BEEN ADDED TO THE HIGHER-END SLIGHT AND LOWER-END MODERATE
SITUATIONS.

SO...RATHER THAN THE ENTIRE AREA FROM SOUTHERN NEW ENGLAND TO
THE MID-ATLANTIC STATES BEING COVERED IN A SLIGHT RISK OF
SEVERE STORMS...THERE MIGHT BE AN ENHANCED RISK PORTION JUST
FROM WESTERN MA TO PHILADELPHIA...AS AN EXAMPLE.

MARGINAL RISK IMPLIES THAT ISOLATED SEVERE THUNDERSTORMS ARE
POSSIBLE. SLIGHT RISK MEANS THAT SCATTERED SEVERE THUNDERSTORMS
ARE POSSIBLE. ENHANCED RISK MEANS THAT NUMEROUS SEVERE STORMS
ARE POSSIBLE...AND THEY ARE MORE PERSISTENT OR WIDESPREAD WITH
A FEW POTENTIALLY PRODUCING A TORNADO. A MODERATE RISK IS ISSUED
WHEN A WIDESPREAD SEVERE THUNDERSTORM OUTBREAK IS LIKELY. IT
OFTEN MEANS THAT SOME OF THE STORMS COULD BE LONG-LIVED AND
POSSIBLY PRODUCE A STRONG TORNADO. A HIGH RISK IS RARE BUT IT
MEANS THAT SEVERE STORMS ARE EXPECTED AND WILL BE VERY
WIDESPREAD...LONG-LIVED...AND PARTICULARLY INTENSE. THIS WILL
OFTEN RESULT IN A TORNADO OUTBREAK OR A DERECHO.

THE CATEGORIES DESCRIBED ABOVE ARE DEFINED BASED ON THE
STATISTICAL PROBABILITIES OF A SEVERE STORM OCCURRING WITHIN
25 MILES OF A GIVEN POINT FOR A GIVEN METEOROLOGICAL SITUATION.
FOR MORE DETAILS ABOUT THIS...PLEASE SEE
HTTP://WWW.SPC.NOAA.GOV/MISC/ABOUT.HTML

$$



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