
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 317
NWS STORM PREDICTION CENTER NORMAN OK
730 PM EDT SAT MAY 30 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL INDIANA
SOUTHWEST OHIO
EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 730 PM
UNTIL 200 AM EDT.
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 45
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF
LAFAYETTE INDIANA TO 70 MILES EAST SOUTHEAST OF DAYTON OHIO. 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 316...
DISCUSSION...THUNDERSTORMS INCREASING COINCIDENT WITH WEAK FRONTAL
WAVE DEVELOPMENT ACROSS IL/IND BORDER ATTM. THIS ACTIVITY APPEARS TO
BE FOCUSED ALONG AND NORTH OF RESIDUAL FRONTAL ZONE EXTENDING NWWD
FROM THE OH RIVER TO THE FRONTAL WAVE/LOW. UNSTABLE WARM SECTOR
SHOULD CONTINUE TO FUEL VIGOROUS STORM UPDRAFTS WITHIN STRONGLY
SHEARED REGIME. PRIMARILY UNIDIRECTIONAL FLOW HAS ALREADY LED TO
NUMEROUS STORM SPLITS WITH BOTH RIGHT AND LEFT MOVERS FAVORED FOR
PERSISTENCE AND LARGE HAIL PRODUCTION. LARGER/UPSCALE ORGANIZATION
INTO SMALL MCS POSSIBLE GIVEN INFLUENCE OF DEVELOPING FRONTAL WAVE
CIRCULATION. STRONG NW FLOW COULD SUPPORT AN INCREASE IN MORE
WIDESPREAD DAMAGING WINDS IF STORM MERGERS LEAD TO MCS DEVELOPMENT
INTO THE EVENING.
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 450. MEAN STORM
MOTION VECTOR 32030.
...CARBIN
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Low
WOUS64 KWNS 302326
WOU7
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 317
NWS STORM PREDICTION CENTER NORMAN OK
730 PM EDT SAT MAY 30 2009
SEVERE THUNDERSTORM WATCH 317 IS IN EFFECT UNTIL 200 AM EDT
FOR THE FOLLOWING LOCATIONS
INC001-009-011-015-017-023-035-041-045-047-053-057-059-063-065-
067-069-075-081-095-097-103-107-109-121-133-135-139-145-157-159-
161-165-169-171-177-179-181-310600-
/O.NEW.KWNS.SV.A.0317.090530T2330Z-090531T0600Z/
IN
. INDIANA COUNTIES INCLUDED ARE
ADAMS BLACKFORD BOONE
CARROLL CASS CLINTON
DELAWARE FAYETTE FOUNTAIN
FRANKLIN GRANT HAMILTON
HANCOCK HENDRICKS HENRY
HOWARD HUNTINGTON JAY
JOHNSON MADISON MARION
MIAMI MONTGOMERY MORGAN
PARKE PUTNAM RANDOLPH
RUSH SHELBY TIPPECANOE
TIPTON UNION VERMILLION
WABASH WARREN WAYNE
WELLS WHITE
OHC011-017-021-023-027-037-047-057-071-097-107-109-113-131-135-
141-149-165-310600-
/O.NEW.KWNS.SV.A.0317.090530T2330Z-090531T0600Z/
OH
. OHIO COUNTIES INCLUDED ARE
AUGLAIZE BUTLER CHAMPAIGN
CLARK CLINTON DARKE
FAYETTE GREENE HIGHLAND
MADISON MERCER MIAMI
MONTGOMERY PIKE PREBLE
ROSS SHELBY WARREN
ATTN...WFO...IWX...ILN...IND...
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Low
Note: The Aviation Watch (SAW) product is an approximation to the watch area. The actual watch is depicted by the shaded areas.
SAW7
WW 317 SEVERE TSTM IN OH 302330Z - 310600Z
AXIS..45 STATUTE MILES NORTH AND SOUTH OF LINE..
25W LAF/LAFAYETTE IN/ - 70ESE DAY/DAYTON OH/
..AVIATION COORDS.. 40NM N/S /17WSW BVT - 43SSW APE/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 450. MEAN STORM MOTION VECTOR 32030.
LAT...LON 41068741 40158301 38848301 39778741