Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL2
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 582
NWS STORM PREDICTION CENTER NORMAN OK
945 PM CDT MON JUL 13 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL AND WESTERN SOUTH DAKOTA
EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 945 PM UNTIL
300 AM CDT.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 85 MILES NORTH NORTHWEST OF
PIERRE SOUTH DAKOTA TO 75 MILES SOUTH SOUTHEAST OF PHILIP SOUTH
DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).
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.
OTHER WATCH INFORMATION...CONTINUE...WW 577...WW 580...WW 581...
DISCUSSION...SCATTERED INTENSE AND ISOLATED SUPERCELL THUNDERSTORMS
PERSIST ACROSS PARTS OF SD THIS EVENING. THESE STORMS WILL REMAIN
CAPABLE OF LARGE HAIL...DAMAGING WINDS...AND ISOLATED TORNADOES FOR
SEVERAL MORE HOURS. EVENTUALLY...STORMS MAY MERGE INTO A MORE
ORGANIZED SQUALL LINE WITH AN ENHANCED THREAT OF DAMAGING WINDS.
AVIATION...TORNADOES AND 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 27035.
...HART
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW2
WW 582 TORNADO SD 140245Z - 140800Z
AXIS..75 STATUTE MILES EAST AND WEST OF LINE..
85NNW PIR/PIERRE SD/ - 75SSE PHP/PHILIP SD/
..AVIATION COORDS.. 65NM E/W /42NE DPR - 54WNW ANW/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 27035.
LAT...LON 45509940 43049955 43040251 45500250
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU2.
Watch 582 Status Report Messages:
STATUS REPORT #1 ON WW 582
VALID 140600Z - 140740Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 NE ANW TO
30 W PIR TO 55 WSW ABR.
..SPC..07/14/09
ATTN...WFO...UNR...ABR...
&&
STATUS REPORT FOR WT 582
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC017-065-069-085-117-119-140740-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BUFFALO HUGHES HYDE
LYMAN STANLEY SULLY
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Mod (40%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (20%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (40%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (30%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (50%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Mod (30%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (80%)
|
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The "Low" category contains probability values ranging from less than 2%
to 20% (F2-F5 tornadoes), less than 5% to 20% (all other probabilities),
"Moderate" from 30% to 60%, and "High" from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.
weather.gov 
