Heat advisory
Encyclopedia
A Heat Advisory is issued by the National Weather Service
of the United States
within 12 hours of the heat index
reaching one of two criteria levels. A warning will be issued if there is a heat index of at least 105°F but less than 115°F for less than 3 hours per day or if nighttime low temperatures are above 80°F for 2 consecutive days. High values of the heat index are caused by temperatures being significantly above normal and high humidities
, and such high levels can pose a threat to human life through conditions such as heat stroke.
.
POINTS IN THE LOW TO MID 70S WILL MAKE FOR PEAK AFTERNOON HEAT
INDEX VALUES OF 103 TO 108 DEGREES SATURDAY THROUGH MONDAY.
LITTLE RELIEF CAN BE EXPECTED AT NIGHT WITH LOWS IN THE MID 70S
IN MOST RURAL LOCATIONS...TO POSSIBLY THE LOWER 80S IN DOWNTOWN
MEMPHIS.
EACH DAY.
PART OF THE COUNTRY SEES ITS FAIR SHARE OF SUMMER HEAT...THIS
WILL BE THE FIRST HEAT WAVE OF THE SUMMER SO PEOPLE SHOULD BE
ESPECIALLY PREPARED FOR THE DANGERS EXCESSIVE HEAT POSES. YOUNG
CHILDREN...ELDERLY PEOPLE AND THOSE WITH ILLNESSES OR HEART
CONDITIONS ARE MOST AT RISK. LIMIT OUTDOOR ACTIVITIES TO EARLY
IN THE MORNING OR UNTIL EVENING. IF YOU HAVE A WORKING AIR
CONDITIONER USE IT...OR AT LEAST OPEN WINDOWS AND ALLOW AIR TO
CIRCULATE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES IS
EXPECTED. THE COMBINATION OF HOT TEMPERATURES AND HIGH HUMIDITY
WILL COMBINE TO CREATE A SITUATION IN WHICH HEAT ILLNESSES ARE
POSSIBLE. DRINK PLENTY OF FLUIDS...STAY IN AN AIR-CONDITIONED
ROOM...STAY OUT OF THE SUN...AND CHECK UP ON RELATIVES AND
NEIGHBORS.
&&
$$
BORGHOFF
National Weather Service
The National Weather Service , once known as the Weather Bureau, is one of the six scientific agencies that make up the National Oceanic and Atmospheric Administration of the United States government...
of the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
within 12 hours of the heat index
Heat index
The heat index is an index that combines air temperature and relative humidity in an attempt to determine the human-perceived equivalent temperature — how hot it feels, termed the felt air temperature. The human body normally cools itself by perspiration, or sweating, which evaporates and carries...
reaching one of two criteria levels. A warning will be issued if there is a heat index of at least 105°F but less than 115°F for less than 3 hours per day or if nighttime low temperatures are above 80°F for 2 consecutive days. High values of the heat index are caused by temperatures being significantly above normal and high humidities
Relative humidity
Relative humidity is a term used to describe the amount of water vapor in a mixture of air and water vapor. It is defined as the partial pressure of water vapor in the air-water mixture, given as a percentage of the saturated vapor pressure under those conditions...
, and such high levels can pose a threat to human life through conditions such as heat stroke.
Example
The following is an example of a Heat Advisory issued by the National Weather Service office in Memphis, TennesseeMemphis, Tennessee
Memphis is a city in the southwestern corner of the U.S. state of Tennessee, and the county seat of Shelby County. The city is located on the 4th Chickasaw Bluff, south of the confluence of the Wolf and Mississippi rivers....
.
114
WWUS74 KMEG 111956
NPWMEG
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MEMPHIS TN
256 PM CDT FRI JUN 11 2010
...PROLONGED HOT AND HUMID WEATHER EXPECTED THIS WEEKEND INTO
EARLY NEXT WEEK...
.A DEEP TROPICAL SOUTHERLY FLOW WILL REMAIN IN PLACE AS A LARGE AREA
OF HIGH PRESSURE BUILDS OVER THE LOWER MISSISSIPPI RIVER VALLEY THIS
WEEKEND. HIGHS SATURDAY THROUGH MONDAY SHOULD RANGE FROM THE MID TO
UPPER 90S ACROSS THE ENTIRE MID-SOUTH...WITH DEW POINTS IN THE
LOW TO MID 70S. THIS WILL MAKE FOR HEAT INDEX VALUES AROUND 105
DEGREES EACH DAY.
THE HEAT AND HUMIDITY WILL NOT SUBSIDE MUCH AT NIGHT WITH TEMPERATURES
ONLY DROPPING INTO THE MID 70S IN MOST RURAL AREAS...TO THE LOWER
80S IN DOWNTOWN MEMPHIS. THIS WILL ADD TO THE DANGER FOR PEOPLE
WHO CANNOT FIND A WAY TO ADEQUATELY COOL DOWN.
ARZ008-009-017-018-026>028-035-036-048-049-058-MOZ113-115-
MSZ001>017-020>024-TNZ001>004-019>021-048>055-088>092-120900-
/O.NEW.KMEG.HT.Y.0001.100612T1500Z-100615T0300Z/
RANDOLPH-CLAY-LAWRENCE-GREENE-CRAIGHEAD-POINSETT-MISSISSIPPI-
CROSS-CRITTENDEN-ST. FRANCIS-LEE AR-PHILLIPS-DUNKLIN-PEMISCOT-
DESOTO-MARSHALL-BENTON MS-TIPPAH-ALCORN-TISHOMINGO-TUNICA-TATE-
PRENTISS-COAHOMA-QUITMAN-PANOLA-LAFAYETTE-UNION-PONTOTOC-LEE MS-
ITAWAMBA-TALLAHATCHIE-YALOBUSHA-CALHOUN-CHICKASAW-MONROE-LAKE-
OBION-WEAKLEY-HENRY-DYER-GIBSON-CARROLL-LAUDERDALE-TIPTON-HAYWOOD-
CROCKETT-MADISON-CHESTER-HENDERSON-DECATUR-SHELBY-FAYETTE-
HARDEMAN-MCNAIRY-HARDIN-
INCLUDING THE CITIES OF...WALNUT RIDGE...PARAGOULD...JONESBORO...
HARRISBURG...BLYTHEVILLE...WYNNE...WEST MEMPHIS...FORREST CITY...
HELENA...KENNETT...CARUTHERSVILLE...SOUTHAVEN...OLIVE BRANCH...
CORINTH...IUKA...TUNICA...BOONEVILLE...CLARKSDALE...BATESVILLE...
OXFORD...NEW ALBANY...TUPELO...AMORY...ABERDEEN...UNION CITY...
MARTIN...DRESDEN...PARIS...DYERSBURG...HUMBOLDT...MILAN...
HUNTINGDON...COVINGTON...JACKSON...LEXINGTON...BARTLETT...
GERMANTOWN...COLLIERVILLE...MEMPHIS...MILLINGTON...SOMERVILLE...
BOLIVAR...SAVANNAH
256 PM CDT FRI JUN 11 2010
...HEAT ADVISORY IN EFFECT FROM 10 AM SATURDAY TO 10 PM CDT
MONDAY...
THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A HEAT
ADVISORY...WHICH IS IN EFFECT FROM 10 AM SATURDAY TO 10 PM CDT
MONDAY.
- HIGH TEMPERATURES IN THE MID TO UPPER 90S COMBINED WITH DEW
POINTS IN THE LOW TO MID 70S WILL MAKE FOR PEAK AFTERNOON HEAT
INDEX VALUES OF 103 TO 108 DEGREES SATURDAY THROUGH MONDAY.
LITTLE RELIEF CAN BE EXPECTED AT NIGHT WITH LOWS IN THE MID 70S
IN MOST RURAL LOCATIONS...TO POSSIBLY THE LOWER 80S IN DOWNTOWN
MEMPHIS.
- THE HIGHEST HEAT INDEX VALUES ARE EXPECTED BETWEEN 1 PM AND 7 PM
EACH DAY.
- EXCESSIVE HEAT IS THE NUMBER ONE WEATHER KILLER. WHILE THIS
PART OF THE COUNTRY SEES ITS FAIR SHARE OF SUMMER HEAT...THIS
WILL BE THE FIRST HEAT WAVE OF THE SUMMER SO PEOPLE SHOULD BE
ESPECIALLY PREPARED FOR THE DANGERS EXCESSIVE HEAT POSES. YOUNG
CHILDREN...ELDERLY PEOPLE AND THOSE WITH ILLNESSES OR HEART
CONDITIONS ARE MOST AT RISK. LIMIT OUTDOOR ACTIVITIES TO EARLY
IN THE MORNING OR UNTIL EVENING. IF YOU HAVE A WORKING AIR
CONDITIONER USE IT...OR AT LEAST OPEN WINDOWS AND ALLOW AIR TO
CIRCULATE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES IS
EXPECTED. THE COMBINATION OF HOT TEMPERATURES AND HIGH HUMIDITY
WILL COMBINE TO CREATE A SITUATION IN WHICH HEAT ILLNESSES ARE
POSSIBLE. DRINK PLENTY OF FLUIDS...STAY IN AN AIR-CONDITIONED
ROOM...STAY OUT OF THE SUN...AND CHECK UP ON RELATIVES AND
NEIGHBORS.
&&
$$
BORGHOFF