Tornado Watch 521

Issued

Oct 25, 2015, 7:12 PM CDT (00:12 UTC)

Expired

Oct 26, 2015, 2:00 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

0.5 in

Strongest gust expected

60 kt

Counties Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Terrebonne Parish, LA, Hancock County, MS, Harrison County, MS, Jackson County, MS

Two or more tornadoes

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

10%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

5%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

30%

• Mesoscale Discussion 1887Oct 25, 6:21 PM CDT
• Mesoscale Discussion 1888Oct 25, 7:53 PM CDT
• Mesoscale Discussion 1889Oct 25, 10:15 PM CDT
• Mesoscale Discussion 1890Oct 26, 1:32 AM CDT

957 
WWUS20 KWNS 260010
SEL1  
SPC WW 260010
LAZ000-MSZ000-CWZ000-260700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 521
NWS STORM PREDICTION CENTER NORMAN OK
710 PM CDT SUN OCT 25 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  SOUTHEASTERN LOUISIANA
  COASTAL MISSISSIPPI
  COASTAL WATERS

* EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 710 PM
  UNTIL 200 AM CDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE TORNADOES POSSIBLE

SUMMARY...A GRADUAL INCREASE IN TORNADO THREAT IS APPARENT ACROSS
THE WATCH AREA AND SHOULD CONTINUE THROUGH AT LEAST PART OF THE
OVERNIGHT HOURS.  GIVEN THE LIKELIHOOD OF A FEW MORE SUPERCELLS
DEVELOPING FROM THIS POINT FORWARD...THIS TORNADO WATCH IS NOW IN
EFFECT.  OTHERWISE...SEE SPC MESOSCALE DISCUSSION 1887 FOR INITIAL
METEOROLOGICAL REASONING.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE
MILES EITHER SIDE OF A LINE FROM 40 MILES SOUTH SOUTHWEST OF NEW
ORLEANS LOUISIANA TO 50 MILES EAST SOUTHEAST OF GULFPORT
MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
400. MEAN STORM MOTION VECTOR 17525.


...EDWARDS

Tornado Watches in Louisiana, 2015Tornado Watches in Mississippi, 2015Every tornado watch in 2015

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.