Public Information Statement
Issued by NWS Paducah, KY

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NOUS43 KPAH 131317
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ILZ075>078-080>094-INZ081-082-085>088-KYZ001>022-MOZ076-086-087-
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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE PADUCAH KY
817 AM CDT MON JUL 13 2015

...DERECHOS - LONG LIVED AND WIDESPREAD WIND STORMS...

THE STORM PREDICTION CENTER HAS PLACED MOST OF THE QUAD STATE
REGION IN A MODERATE RISK OF SEVERE THUNDERSTORMS FOR THIS
AFTERNOON AND TONIGHT...GENERALLY EAST OF THE MISSISSIPPI RIVER
TO THE LAND BETWEEN THE LAKES.

ALTHOUGH THERE IS SOME UNCERTAINTY AS TO THE LOCATION OF THE
SEVERE THUNDERSTORMS, THERE IS AN INCREASED POTENTIAL THAT THE
THUNDERSTORMS MAY DEVELOP INTO A LINE OF SEVERE WIND PRODUCING
THUNDERSTORMS CALLED A DERECHO.

GIVEN THE DAMAGE POTENTIAL ASSOCIATED WITH A DERECHO, EXTENSIVE
AND LONG LASTING POWER OUTAGES MAY OCCUR. WITH THE SUMMER HEAT AND
HUMIDITY, THIS MAY COULD POSE PROBLEMS FOR THOSE PERSONS PRONE TO
HEAT RELATED ILLNESSES.

IF YOU LIKE TO GET MORE INFORMATION ON HOW TO PREPARE FOR SEVERE
WEATHER, CHECK OUT THE LINKS AT WWW.READY.GOV.

WHAT IS A DERECHO?

A DERECHO, PRONOUNCED DEY-RAH-CHO, IS A WIDESPREAD AND LONG LIVED
WIND STORM THAT IS ASSOCIATED WITH A BAND OF RAPIDLY MOVING
SHOWERS OR THUNDERSTORMS THAT ARE OFTEN CURVED IN SHAPE. DERECHOS
ARE OFTEN CAUSED BY BOWED OUT THUNDERSTORMS CALLED BOW ECHOES. A
DERECHO CAN BE ASSOCIATED WITH A SINGLE BOW ECHO OR MADE UP OF
MULTIPLE BOW ECHOES. THESE WIND STORMS CAN CAUSE SIGNIFICANT
DAMAGE AND LOSS OF LIFE.

HOW LARGE AND FAST IS A DERECHO?

THE SIZE OF A DERECHO CAN RANGE FROM A SINGLE BOW ECHO IN A
RELATIVELY SHORT LINE OF THUNDERSTORMS, RANGING FROM 40 TO 250
MILES IN LENGTH, TO A SERIES OF BOW ECHOES EMBEDDED IN A LARGE
LINE OF THUNDERSTORMS COVERING HUNDREDS OF MILES.  DERECHOS
TYPICALLY MOVE A A SPEED OF 50 MPH OR GREATER, BUT CAN MOVE AS
FAST AS 70 MPH.

HOW STRONG ARE WINDS ASSOCIATED WITH A DERECHO?

TO BE A DERECHO, WINDS MUST BE GREATER THAN 57 MPH ALONG MOST
POINTS IN THE PATH OF THE WIND STORM.  STRONGER DERECHOS CAN HAVE
WINDS THAT EXCEED 100 MPH.  SOME DERECHOS, SUCH AS THE ONE THAT
OCCURRED ON MAY 31ST, 1998 IN WISCONSIN AND LOWER MICHIGAN,
PRODUCED A MEASURED WIND GUST OF 128 MPH.

WHEN AND WHERE DO DERECHOS MOST COMMONLY OCCUR?

MOST DERECHOS ARE MOST COMMON IN THE LATE SPRING AND EARLY SUMMER,
GENERALLY FROM MAY THROUGH AUGUST, IN THE CENTRAL UNITED STATES.

DERECHOS IN THE UNITED STATES PRIMARILY OCCUR IN TWO AREAS, ALONG
THE CORN BELT FROM THE UPPER MISSISSIPPI RIVER VALLEY INTO THE
OHIO VALLEY, AND FROM THE MIDDLE MISSISSIPPI VALLEY INTO THE
SOUTHERN PLAINS.

IN THE COOL SEASON, WHICH STRETCHES FROM SEPTEMBER TO APRIL, SOME
DERECHOS ARE MOST LIKELY TO OCCUR FROM EASTERN TEXAS INTO THE
SOUTHEASTERN STATES.

WHO ARE MOST AT RISK FROM A DERECHO?

PEOPLE INVOLVED IN OUTDOOR ACTIVITIES ARE MOST AT RISK.  THOSE
PERSONS CAMPING OR HIKING IN FORESTED AREAS ARE VULNERABLE TO
BEING KILLED OR INJURED BY FALLING TREES.  FOR THOSE PERSONS ON
BOATS AND OTHER BODIES OF WATER, DROWNING OR INJURY CAN OCCUR WHEN
STRONG WINDS AND HIGH WAVES OVERTURN OR CAPSIZE BOATS.

PERSONS IN CARS AND TRUCKS ARE ALSO VULNERABLE TO BEING HIT BY
FALLING TREES, POWER POLES, AND OTHR WIND BLOWN OBJECTS.  DRIVERS
OF HIGH PROFILE VEHICLES, SUCH AS SEMI-TRAILER TRUCKS, BUSES AND
SUBURBAN UTILITY VEHICLES ARE AT RISK OF BEING BLOWN OVER.  AT
OUTSIDE EVENTS, SUCH AS FAIRS AND FESTIVALS, PEOPLE RISK BEING
KILLED OR INJURED BY COLLAPSING TENTS OR OTHER FLYING DEBRIS.

EVEN THOSE INSIDE RUN THE RISK OF DEATH OR INJURY IN CERTAIN
STRUCTURES DURING A DERECHO EVENT.  MOBILE HOMES ARE AT RISK OF
BEING OVERTURNED OR DESTROYED. BARNS AND OTHER OUTBUILDINGS CAN BE
AT RISK OF COLLAPSING.  PERSONS INSIDE HOMES AND BUSINESSES CAN BE
VICTIMS OF LARGE TREES OR BRANCHES FALLING THROUGH THE ROOF OR
FROM AIRBORNE GLASS FROM BROKEN WINDOWS, OR FROM ACTUAL STRUCTURAL
DAMAGE TO THE BUILDING ITSELF.

IN LARGE CITIES AND RURAL AREAS, THE PASSAGE OF A DERECHO CAN LEAD
TO A WIDESPREAD LOSS OF ELECTRICAL POWER.  DEPENDING ON THE DAMAGE
TO POWER POLES AND OTHER PARTS OF THE ELECTRICAL POWER SYSTEM, THE
LOSS OF ELECTRICAL POWER CAN RANGE FROM ONLY A FEW HOURS TO
SEVERAL WEEKS.

WHAT IS AN EXAMPLE OF A RECENT DERECHO IN THE QUAD STATE AREA?

ON JULY 21ST, 2006, THE MOUNT VERNON ILLINOIS AREA WAS STRUCK BY A
WIDESPREAD AND EXTREMELY DAMAGING WIND EVENT THAT ORIGINATED IN
THE ST. LOUIS AREA.  WINDS IN EXCESS OF 90 MPH DAMAGED OR
DESTROYED 14 PERCENT OF ALL HOMES, APPROXIMATELY 1107 HOMES, IN
THE CITY OF MOUNT VERNON, ACCORDING TO THE FEDERAL EMERGENCY
MANAGEMENT AGENCY.  DESPITE THE INTENSE DESTRUCTION, ONLY A
HANDFUL OF PEOPLE WERE INJURED, WITH NO FATALITIES.

WHAT CAN I DO TO PREPARE FOR A DERECHO?

DURING GOOD WEATHER DAYS, CHECK AROUND YOUR HOME OR BUSINESS TO
SEE IF THERE ARE ANY TREES OR OTHER UNSECURED STRUCTURES THAT
COUOLD BE TOSSED AROUND OR BROKEN IN THE FACE OF STRONG WINDS.  IF
THERE ARE TREE LIMBS OR OTHER VEGETATION AROUND POWER LINES NEAR
YOUR HOME OR BUSINESS, CONTACT YOUR LOCAL UTILITY COMPANY TO MAKE
ARRANGEMENTS TO HAVE THEM SAFELY REMOVED.

IF STRONG STORMS ARE FORECAST OR EXPECTED, MAKE PLANS TO SEEK
SHELTER IN AN INTERIOR ROOM ON THE LOWEST LEVEL OF A STURDAY
BUILDING.  STAY TUNED TO NOAA WEATHER RADIO TO KEEP UPDATED ON THE
LATEST WEATHER STATEMENTS AND WARNINGS.

AFTER THE PASSAGE OF THE STORMS, BE CAREFUL WHEN VENTURING
OUTDOORS.  KEEP YOURSELF AND CHILDREN AWAY FROM DOWNED CABLES AND
WIRES.  THIS IS ESPECIALLY TRUE IN FLOODED AREAS, WHERE WATER AND
STORM DEBRIS MAY BE HIDING ENERGIZED ELECTRICAL LINES.  IN
ADDITON, BE CAREFUL NEAR DOWNED TREES OR DAMAGED BUILDINGS, THESE
STRUCTURES MAY BE UNSTABLE AND FALL WITHOUT ANY WARNING.

WHERE CAN I FIND MORE INFORMATION ABOUT DERECHOS?

IF YOU WOULD LIKE TO LEARN MORE ABOUT DERECHOS, GO TO THE
FOLLOWING LINK AT THE STORM PREDICTION CENTER WEB SITE,

HTTP://WWW.SPC.NOAA.GOV/MISC/ABTDERECHOS/DERECHOFACTS.HTM

$$

SMITH


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