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April 26th-30th, 2014 Major Tornado Outbreak


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Of all days:

MEG -- KNQA 88D IS DEGRADED AT THIS TIME. DUAL POL PRODUCTS ARE UNRELIABLE. STANDARD RE
LECTIVITY PRODUCTS ARE LIKELY HIGHER THAN THEY SHOULD BE. THIS WILL IMPACT PRECI
PITATION PRODUCTS AND OTHER PRODUCTS AS WELL. MAINTENANCE WILL BE PERFORMED AT T
HE LATEST ON WEDNESDAY DUE TO ONGOING SEVERE WEATHER.

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Of all days:

MEG -- KNQA 88D IS DEGRADED AT THIS TIME. DUAL POL PRODUCTS ARE UNRELIABLE. STANDARD RE

LECTIVITY PRODUCTS ARE LIKELY HIGHER THAN THEY SHOULD BE. THIS WILL IMPACT PRECI

PITATION PRODUCTS AND OTHER PRODUCTS AS WELL. MAINTENANCE WILL BE PERFORMED AT T

HE LATEST ON WEDNESDAY DUE TO ONGOING SEVERE WEATHER.

 

At least it's just the Memphis radar...and at least it isn't fully down.  The Nashville, Huntsville, and Columbus radars are fortunately fine.

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I'm actually paying more attention to that area of the SPC mesoanalysis (also in part because I know parameters will be great in MS).

 

 

 

Pretty sharp boundary but expected storm motions suggest that storms may not have long residence time near it.

 

 

post-14-0-03802800-1398705697_thumb.png

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265  
WWUS20 KWNS 281742  
SEL8  
SPC WW 281742  
ALZ000-LAZ000-MSZ000-TNZ000-290200-  
 
URGENT - IMMEDIATE BROADCAST REQUESTED  
TORNADO WATCH NUMBER 108  
NWS STORM PREDICTION CENTER NORMAN OK  
1240 PM CDT MON APR 28 2014  
 
THE NWS STORM PREDICTION CENTER HAS ISSUED A  
 
* TORNADO WATCH FOR PORTIONS OF  
NORTH AND NORTHWEST ALABAMA  
NORTHEAST LOUISIANA  
CENTRAL AND NORTHEAST MISSISSIPPI  
SOUTHERN MIDDLE TENNESSEE  
 
* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 1240 PM UNTIL  
900 PM CDT.  
   
..THIS IS A PARTICULARLY DANGEROUS SITUATION
 
 
* PRIMARY THREATS INCLUDE...  
NUMEROUS TORNADOES EXPECTED WITH A FEW INTENSE TORNADOES LIKELY  
WIDESPREAD LARGE HAIL EXPECTED WITH ISOLATED VERY LARGE HAIL  
EVENTS TO 3 INCHES IN DIAMETER LIKELY  
SCATTERED DAMAGING WIND GUSTS TO 70 MPH LIKELY  
 
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE  
MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH OF HUNTSVILLE  
ALABAMA TO 10 MILES SOUTH OF NATCHEZ MISSISSIPPI. FOR A COMPLETE  
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE  
(WOUS64 KWNS WOU8).  

 

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR  
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH  
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR  
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS  
AND POSSIBLE WARNINGS.  
 

 
 
DISCUSSION...SURFACE-BASED STORMS ARE BEGINNING TO DEVELOP FROM NE  
LA INTO W CENTRAL MS...WITH ADDITIONAL DEVELOPMENT EXPECTED NEWD  
TOWARD NE MS/NW AL AS CLOUDS CLEAR AND THE LOW LEVELS DESTABILIZE.  
A COMBINATION OF MODERATE INSTABILITY /MLCAPE NEAR 2000 J PER KG/  
AND STRONG DEEP-LAYER VERTICAL SHEAR WILL SUPPORT A BROKEN BAND OF  
SUPERCELLS...WHILE SOME INCREASE IN LOW-LEVEL SHEAR IS EXPECTED THIS  
AFTERNOON FROM CENTRAL MS INTO NE MS/NW AL...UP TO A RESIDUAL  
OUTFLOW BOUNDARY IN SRN MIDDLE TN. SOME OF THE SUPERCELLS WILL BE  
LONG-LIVED AND CAPABLE OF PRODUCING STRONG/LONG-TRACK TORNADOES...AS  
WELL AS VERY LARGE HAIL.  
 
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL  
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE  
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO  
550. MEAN STORM MOTION VECTOR 24035.  
 
...THOMPSON  
 
 

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