Public Information Statement
Issued by NWS Aberdeen, SD

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NOUS43 KABR 261050
PNSABR
SDZ003>011-015>023-033>037-045-048-051-271100-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE ABERDEEN SD
550 AM CDT TUE APR 26 2016 /450 AM MDT TUE APR 26 2016/

...SOUTH DAKOTA SEVERE WEATHER AWARENESS WEEK...DAY TWO...
...THUNDERSTORMS...WIND...HAIL AND LIGHTNING...

THUNDERSTORMS...
AFFECT RELATIVELY SMALL AREAS WHEN COMPARED WITH MOST OTHER STORMS. THE
TYPICAL THUNDERSTORM IS 15 MILES IN DIAMETER AND LASTS FOR 30 MINUTES.
DESPITE THIS SIZE...ALL THUNDERSTORMS ARE DANGEROUS. SEVERE THUNDERSTORMS
PRODUCE LARGE HAIL OR WINDS OF AT LEAST 58 MPH. SOME WIND GUSTS CAN EXCEED
100 MPH AND PRODUCE TORNADO-LIKE DAMAGE. MANY COMMUNITIES WILL SOUND THEIR
OUTDOOR SIRENS FOR VERY DAMAGING STRAIGHT-LINE WINDS. WHEN A SEVERE
THUNDERSTORM THREATENS...STAY INSIDE A STRONG STRUCTURE. MOBILE HOME
OCCUPANTS SHOULD GO TO A MORE PERMANENT STRUCTURE.

HAIL...
IS ANOTHER PRODUCT OF THUNDERSTORMS THAT ANNUALLY CAUSES NEARLY ONE
BILLION DOLLARS IN DAMAGE THROUGHOUT THE UNITED STATES. MANY OF THE LOSSES
ARE INCURRED BY FARMERS. THE MOST COMMON DIAMETER IS PEA SIZE...BUT HAIL
CAN BE AS LARGE AS GOLF BALLS AND BASEBALLS. IN EXTREME CASES...HAIL CAN
REACH GRAPEFRUIT SIZE. LARGE HAIL STONES FALL AT SPEEDS FASTER THAN
100 MPH AND HAVE BEEN KNOWN TO KILL PEOPLE.

THUNDERSTORM WINDS...
THUNDERSTORMS CAN PRODUCE STRONG WIND GUSTS. THESE STRAIGHT-LINE WINDS
HAVE BEEN KNOWN TO EXCEED 100 MPH. FOR THIS REASON...YOU SHOULD TREAT
SEVERE THUNDERSTORMS JUST AS YOU WOULD TORNADOES. MOVE TO AN APPROPRIATE
SHELTER IF YOU ARE IN THE PATH OF THE STORM.

THE STRONG OUTRUSH OF WIND FROM A THUNDERSTORM IS OFTEN CALLED A
DOWNBURST. ONE OF THE PRIMARY CAUSES IS RAIN-COOLED AIR...WHICH
ACCELERATES RAPIDLY DOWNWARD...PRODUCING A POTENTIALLY DAMAGING GUST OF
WIND.

STRONG DOWNBURSTS ARE OFTEN MISTAKEN FOR TORNADOES. THEY CAN PRODUCE
EXTENSIVE DAMAGE AND ARE OFTEN ACCOMPANIED BY A ROARING SOUND SIMILAR TO
THAT OF A TORNADO. DOWNBURSTS CAN EASILY OVERTURN MOBILE HOMES...TEAR
ROOFS OFF OF HOUSES...AND TOPPLE TREES. PEOPLE WHO ARE CAMPING ARE
ESPECIALLY VULNERABLE...DUE TO TREES TOPPLING ON THEIR CAMPSITES.

LIGHTNING...
EVERY THUNDERSTORM PRODUCES LIGHTNING...WHICH ON A NATIONAL BASIS KILLS
MORE PEOPLE THAN TORNADOES IN A GIVEN YEAR. LIGHTNING KILLS AROUND
100 AMERICANS ANNUALLY  THERE HAVE BEEN MANY DEATHS AND INJURIES OVER THE
YEARS...MOST IN AREAS SUCH AS CAMPGROUNDS...ALTHOUGH PEOPLE HAVE BEEN
INJURED INDOORS WHEN TALKING ON THE PHONE.

THE FOLLOWING ARE SOME LIGHTNING SAFETY TIPS...

1. ALL THUNDERSTORMS PRODUCE LIGHTNING. IT IS SURPRISING THAT SO MANY
PEOPLE ARE NOT AWARE OF THIS.

2. GET INSIDE A BUILDING OR ENCLOSED VEHICLE. MANY FATALITIES OCCUR WHEN
THE WARNING SIGNS ARE IGNORED.

3. IF CAUGHT IN AN OPEN AREA WITH LIGHTNING ALL AROUND...CROUCH DOWN
IMMEDIATELY! PUT YOUR HANDS ON YOUR KNEES BUT DO NOT LIE DOWN ON THE
GROUND.

4. DO NOT USE A TELEPHONE OR ELECTRICAL APPLIANCE. A NEARBY LIGHTNING
STRIKE CAN TRAVEL THROUGH THE PHONE OR POWER LINES RIGHT INTO THE HOME.

5. AVOID SEEKING SHELTER BENEATH LONE TREES.

MYTHS AND FACTS ABOUT LIGHTNING...

MYTH: IF IT IS NOT RAINING...THERE IS NO DANGER FROM LIGHTNING.
FACT: LIGHTNING OFTEN STRIKES AWAY FROM HEAVY RAINFALL...AND MAY OCCUR AS
FAR AS 10 MILES AWAY FROM ANY RAINFALL.

MYTH: RUBBER SOLES OF SHOES OR RUBBER TIRES ON A CAR WILL PROTECT YOU FROM
BEING INJURED BY LIGHTNING.
FACT: RUBBER PROVIDES NO PROTECTION FROM LIGHTNING. HOWEVER...THE STEEL
FRAME OF A HARD-TOPPED VEHICLE PROVIDES INCREASED PROTECTION FROM
LIGHTNING (IF YOU ARE NOT TOUCHING METAL IN THE CAR).

MYTH: PEOPLE STRUCK BY LIGHTNING CARRY AN ELECTRICAL CHARGE AND SHOULD NOT
BE TOUCHED.
FACT: LIGHTNING-STRIKE VICTIMS CARRY NO ELECTRICAL CHARGE AND SHOULD BE
ATTENDED TO IMMEDIATELY.

MYTH: HEAT LIGHTNING OCCURS AFTER VERY HOT SUMMER DAYS AND POSES NO
THREAT.
FACT: WHAT IS REFERRED TO AS "HEAT LIGHTNING" IS ACTUALLY LIGHTNING FROM A
THUNDERSTORM TOO FAR AWAY FOR THUNDER TO BE HEARD. HOWEVER...THE STORM MAY
BE MOVING IN YOUR DIRECTION.

$$



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