Severe Local Storm Watch and Watch Cancellation Msg
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 
000
WWUS20 KWNS 201701
SEL9
SPC WW 201701
MIZ000-LHZ000-LMZ000-210000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 189
NWS STORM PREDICTION CENTER NORMAN OK
100 PM EDT MON MAY 20 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
  LOWER MICHIGAN
  LAKE HURON
  LAKE MICHIGAN

* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 100 PM UNTIL
  800 PM EDT.

* PRIMARY THREATS INCLUDE...
  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2
    INCHES IN DIAMETER POSSIBLE
  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES WEST
NORTHWEST OF ALPENA MICHIGAN TO 40 MILES SOUTH OF JACKSON
MICHIGAN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

DISCUSSION...IN THE PRESENCE OF AT LEAST MODEST DEEP LAYER
SHEAR...STORM DEVELOPMENT IS EXPECTED TO CONTINUE INCREASING IN
COVERAGE AND INTENSITY ALONG AN EASTWARD PROGRESSING WIND
SHIFT...ENHANCED BY THE LAKE BREEZE...ACROSS LOWER MICHIGAN THIS
AFTERNOON.  BENEATH FAIRLY STEEP LAPSE RATES...SURFACE HEATING OF A
MOIST BOUNDARY LAYER HAS YIELDED LARGE MIXED LAYER CAPE OF
2000-3000+ J/KG... SUPPORTIVE OF SEVERE STORMS CAPABLE OF PRODUCING
LARGE HAIL.  CONSOLIDATING CONVECTIVELY GENERATED COLD POOLS MAY
CONTRIBUTE TO INCREASING POTENTIAL FOR POTENTIALLY DAMAGING WIND
GUSTS THROUGH THE AFTERNOON.

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 500. MEAN STORM
MOTION VECTOR 24035.


...KERR
USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.