Severe Thunderstorm Watch 147

Issued

Apr 5, 2012, 1:21 PM CDT (18:21 UTC)

Expired

Apr 5, 2012, 8:57 PM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Nashville radar (KOHX), 68 km from the middle of the area, began a volume at 18:22 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 456Apr 5, 12:03 PM CDT
• Mesoscale Discussion 457Apr 5, 12:09 PM CDT
• Mesoscale Discussion 458Apr 5, 12:54 PM CDT
• Mesoscale Discussion 460Apr 5, 2:22 PM CDT
• Mesoscale Discussion 461Apr 5, 2:37 PM CDT
• Mesoscale Discussion 462Apr 5, 3:06 PM CDT
• Mesoscale Discussion 466 Severe potential...watch likelyApr 5, 6:15 PM CDT

470 
WWUS20 KWNS 051823
SEL7
SPC WW 051823
ALZ000-NCZ000-TNZ000-060200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 147
NWS STORM PREDICTION CENTER NORMAN OK
125 PM CDT THU APR 5 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

       NORTHERN ALABAMA
       FAR WESTERN NORTH CAROLINA
       MIDDLE AND EASTERN TENNESSEE

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 125 PM UNTIL
900 PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTHWEST
OF MUSCLE SHOALS ALABAMA TO 20 MILES EAST OF KNOXVILLE TENNESSEE.
 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 143...WW 144...WW
145...WW 146...

DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY THIS AFTERNOON AHEAD OF VORTICITY MAXIMUM PIVOTING NEWD
INTO THE TN VALLEY...AHEAD OF UPPER LOW NEAR THE MS RIVER.  THOUGH
VERTICAL SHEAR WILL REMAIN SOMEWHAT MARGINAL...STEEP MIDLEVEL LAPSE
RATES AND MODERATE INSTABILITY WILL SUPPORT SEVERE STORMS CAPABLE OF
HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM
MOTION VECTOR 21020.


...MEAD

Severe Thunderstorm Watches in Tennessee, 2012Severe Thunderstorm Watches in Alabama, 2012Severe Thunderstorm Watches in North Carolina, 2012Every severe thunderstorm watch in 2012

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.