Public Information Statement
Issued by NWS Boston, MA

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000 NOUS41 KBOX 291728 PNSBOX CTZ002>004-MAZ002>024-026-RIZ001>008-292130- 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 $$ FOR THE LATEST UPDATES...PLEASE VISIT OUR WEBPAGE AT WWW.WEATHER.GOV/BOSTON YOU CAN FOLLOW US ON FACEBOOK AT WWW.FACEBOOK.COM/NWSBOSTON YOU CAN FOLLOW US ON TWITTER AT @NWSBOSTON

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