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The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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Watch Status Reports.
SEL4
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 674
NWS STORM PREDICTION CENTER NORMAN OK
855 PM CDT FRI AUG 7 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTH CENTRAL NEBRASKA
CENTRAL SOUTH DAKOTA
EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 855 PM
UNTIL 200 AM CDT.
HAIL TO 3 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 60
STATUTE MILES EAST AND WEST OF A LINE FROM MULLEN NEBRASKA TO 25
MILES NORTHEAST OF PIERRE SOUTH DAKOTA. FOR A COMPLETE DEPICTION
OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS
WOU4).
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 672...WW 673...
DISCUSSION...LARGE SUPERCELL MAY CONTINUE ESEWD ALONG SURFACE FRONT
INVOF LOW CENTER FOR A FEW MORE HOURS GIVEN INFLUX OF VERY UNSTABLE
AIR AND STRONG DEEP LAYER SHEAR. ADDITIONAL CLUSTERS OF STORMS
SHOULD SPREAD EWD ACROSS N-CENTRAL NEB/S-CENTRAL SD. LARGE
HAIL...INCLUDING ISOLATED VERY LARGE STONES WITH PERSISTENT
SUPERCELLS...ALONG WITH DAMAGING WINDS WILL BE PRIMARY THREATS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27035.
...EVANS
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW4
WW 674 SEVERE TSTM NE SD 080155Z - 080700Z
AXIS..60 STATUTE MILES EAST AND WEST OF LINE..
MHN/MULLEN NE/ - 25NE PIR/PIERRE SD/
..AVIATION COORDS.. 50NM E/W /57WSW ANW - 18NE PIR/
HAIL SURFACE AND ALOFT..3 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 27035.
LAT...LON 42040223 44630113 44639869 42049990
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU4.
Watch 674 Status Report Messages:
STATUS REPORT #5 ON WW 674
VALID 080650Z - 080700Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
WW 674 MAY BE ALLOWED TO EXPIRE AT 080700Z.
..EDWARDS..08/08/09
ATTN...WFO...LBF...FSD...ABR...UNR...
&&
STATUS REPORT FOR WS 674
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NEC017-031-103-161-080700-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BROWN CHERRY KEYA PAHA
SHERIDAN
$$
SDC015-017-023-053-059-065-069-075-085-095-117-119-121-123-
080700-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BRULE BUFFALO CHARLES MIX
GREGORY HAND HUGHES
HYDE JONES LYMAN
MELLETTE STANLEY SULLY
TODD TRIPP
$$
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.
$$
STATUS REPORT #4 ON WW 674
VALID 080535Z - 080640Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
FOR ADDITIONAL INFORMATION SEE SPC MESOSCALE DISCUSSION 1819.
..EDWARDS..08/08/09
ATTN...WFO...LBF...FSD...ABR...UNR...
&&
STATUS REPORT FOR WS 674
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NEC017-031-103-161-080640-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BROWN CHERRY KEYA PAHA
SHERIDAN
$$
SDC015-017-023-053-059-065-069-075-085-095-117-119-121-123-
080640-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BRULE BUFFALO CHARLES MIX
GREGORY HAND HUGHES
HYDE JONES LYMAN
MELLETTE STANLEY SULLY
TODD TRIPP
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 674
VALID 080435Z - 080540Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..MEAD..08/08/09
ATTN...WFO...LBF...FSD...ABR...UNR...
&&
STATUS REPORT FOR WS 674
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NEC017-031-103-161-080540-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BROWN CHERRY KEYA PAHA
SHERIDAN
$$
SDC015-017-023-053-059-065-069-075-085-095-117-119-121-123-
080540-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BRULE BUFFALO CHARLES MIX
GREGORY HAND HUGHES
HYDE JONES LYMAN
MELLETTE STANLEY SULLY
TODD TRIPP
$$
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.
$$
STATUS REPORT #2 ON WW 674
VALID 080335Z - 080440Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..MEAD..08/08/09
ATTN...WFO...LBF...FSD...ABR...UNR...
&&
STATUS REPORT FOR WS 674
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NEC017-031-103-161-080440-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BROWN CHERRY KEYA PAHA
SHERIDAN
$$
SDC015-017-023-053-059-065-069-075-085-095-117-119-121-123-
080440-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BRULE BUFFALO CHARLES MIX
GREGORY HAND HUGHES
HYDE JONES LYMAN
MELLETTE STANLEY SULLY
TODD TRIPP
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 674
VALID 080240Z - 080340Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..MEAD..08/08/09
ATTN...WFO...LBF...FSD...ABR...UNR...
&&
STATUS REPORT FOR WS 674
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NEC017-031-103-161-080340-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BROWN CHERRY KEYA PAHA
SHERIDAN
$$
SDC015-017-023-053-059-065-069-075-085-095-117-119-121-123-
080340-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BRULE BUFFALO CHARLES MIX
GREGORY HAND HUGHES
HYDE JONES LYMAN
MELLETTE STANLEY SULLY
TODD TRIPP
$$
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
|
Low (10%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (5%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (30%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (30%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Mod (50%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (70%)
|
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 
