300  
NOUS43 KPAH 152151  
PNSPAH  
ILZ075>078-080>094-INZ081-082-085>088-KYZ001>022-MOZ076-086-087-  
100-107>112-114-161000-  
 
PUBLIC INFORMATION STATEMENT  
NATIONAL WEATHER SERVICE PADUCAH, KY  
451 PM CDT FRI JUL 15 2016  
 
   
..ISOLATED LANDSPOUTS MAY STILL BE POSSIBLE THIS AFTERNOON
 
 
THERE HAVE BEEN A FEW REPORTS OF LANDSPOUTS IN THE DELTA REGION OF  
OF SOUTHEAST MISSOURI, NAMELY IN NEW MADRID COUNTY MISSOURI TODAY.  
NO DAMAGE WAS REPORTED WITH THESE UNIQUE WEATHER PHENOMENA.  
 
LANDSPOUTS USUALLY APPEAR TO THE EYE AS VERY NARROW, ROPE-LIKE  
TORNADOES COMING OUT OF A RATHER BENIGN CUMULUS OR TOWERING  
CUMULUS CLOUDS. SCIENTIFICALLY, IT IS A CONDENSATION FUNNEL,  
RESEMBLING A TUBE REACHING FROM THE BASE OF THE CLOUD TO THE  
GROUND AND IS NOT ASSOCIATED WITH A WALL CLOUD. THEY ARE USUALLY  
VERY SHORT-LIVED AND WEAK. RARELY, LANDSPOUTS CAN PRODUCE SOME  
MINOR DAMAGE.  
 
LANDSPOUTS ARE NOT ASSOCIATED WITH SUPERCELL THUNDERSTORMS, WHICH  
ARE CAPABLE OF PRODUCING DEEPER AND MORE SUSTAINED ROTATION OF AIR  
PARCELS WITHIN A STORM THAT YIELD A GREATER THREAT OF SEVERE  
WEATHER.  
 
ALTHOUGH THOUGHT OF AS A WEATHER PHENOMENA OF IN THE HIGH PLAINS  
OF THE UNITED STATES, LANDSPOUTS PERIODICALLY OCCUR IN THE  
SOUTHERN PLAINS AND MISSISSIPPI VALLEY. THEY ARE MORE COMMON  
DURING THE SPRING AND SUMMER MONTHS WHEN THERE IS EXTREMELY MOIST  
AND UNSTABLE AIR NEAR THE SURFACE AND CHANGES IN WIND DIRECTION  
AND SPEED MUCH HIGHER IN THE ATMOSPHERE AND ARE MORE SUBTLE AND  
WEAK.  
 
AROUND THE QUAD STATE REGION, THE MOST LIKELY LOCATION TO SEE  
LANDSPOUTS IS IN THE THE MISSISSIPPI DELTA REGION, SUCH AS IN  
PARTS OF SOUTHEAST MISSOURI. THESE AREAS USUALLY HAVE A READY  
RESERVOIR OF MUCH DEEPER, WARM AND MOIST AIR NEAR THE GROUND.  
 
INTERESTINGLY, THE FORMATION OF LANDSPOUTS CAN OCCUR EVEN BEFORE  
ANY PRECIPITATION IS OBSERVED OR DETECTED BY RADAR. THIS MAKES IT  
DIFFICULT FOR EVEN THE MOST SOPHISTICATED RADAR SYSTEMS TO DETECT  
THESE SHORT-LIVED PHENOMENA.  
 
SOMETIMES, LANDSPOUTS MAY DEVELOP ON THE LEADING EDGE OF AN  
OUTFLOW OF COLD AIR THAT DESCEND FROM THUNDERSTORMS, CALLED A  
GUST FRONT. A GUST FRONT IS USUALLY NOTICEABLE BY A SHARP  
INCREASE IN WINDS AND SLIGHTLY COOLER AIR THAT COMES FROM A  
THUNDERSTORM. ANY OBSERVABLE CIRCULATIONS SEEN TO DEVELOP FROM  
CLOUDS THAT DEVELOP ON THE GUST FRONT ARE COMMONLY REFERRED TO AS  
GUSTNADOES.  
 
METEOROLOGISTS CONTINUE TO RESEARCH METHODS TO DIAGNOSE AND  
FORECAST THE EXISTENCE OF LANDSPOUTS. THEIR OCCURRENCE IS MORE  
COMMON ALONG THE LEADING EDGE OF BOW ECHOES OR NEAR INTERSECTING  
OUTFLOWS FROM NEARBY THUNDERSTORMS, TYPICAL OF WARM SEASON WEATHER  
SYSTEMS IN THE UNITED STATES.  
 

 
 
SMITH  
 
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