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Watch Status Reports.
SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 677
NWS STORM PREDICTION CENTER NORMAN OK
1245 PM CDT SAT AUG 8 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
EXTREME NORTHWESTERN IOWA
WEST CENTRAL AND SOUTHWESTERN MINNESOTA
EASTERN SOUTH DAKOTA
EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 1245 PM UNTIL
700 PM CDT.
TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST SOUTHWEST OF
BROOKINGS SOUTH DAKOTA TO 45 MILES EAST NORTHEAST OF REDWOOD
FALLS MINNESOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).
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 676...
DISCUSSION...A SUPERCELL WAS LOCATED IN SERN SD AND OTHER SUPERCELLS
ARE LIKELY TO DEVELOP...AS STRONG SHORTWAVE TROUGH MOVES ENEWD
THROUGH CENTRAL SD INTO WRN MN THROUGH THE AFTERNOON. THE AMOUNT OF
DEEP LAYER SHEAR...AROUND 60 KT...AND STRONG TO EXTREME INSTABILITY
BY LATE AFTERNOON WILL SUPPORT VERY LARGE HAIL AND DAMAGING WINDS.
THE VERY MOIST BOUNDARY LAYER AND ENHANCED LOW LEVEL SHEAR NEAR
BOUNDARIES WILL BE FAVORABLE FOR TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
600. MEAN STORM MOTION VECTOR 25030.
...IMY
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW7
WW 677 TORNADO IA MN SD 081745Z - 090000Z
AXIS..70 STATUTE MILES NORTH AND SOUTH OF LINE..
50WSW BKX/BROOKINGS SD/ - 45ENE RWF/REDWOOD FALLS MN/
..AVIATION COORDS.. 60NM N/S /47WNW FSD - 43W MSP/
HAIL SURFACE AND ALOFT..3 INCHES. WIND GUSTS..70 KNOTS.
MAX TOPS TO 600. MEAN STORM MOTION VECTOR 25030.
LAT...LON 45029775 45819423 43779423 43009775
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU7.
Watch 677 Status Report Messages:
STATUS REPORT #4 ON WW 677
VALID 082245Z - 082340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 W FRM TO
20 S RWF TO 25 W RWF TO 20 ENE VVV.
..MEAD..08/08/09
ATTN...WFO...FSD...ABR...MPX...
&&
STATUS REPORT FOR WT 677
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MNC015-023-041-067-085-091-093-103-121-127-129-143-145-149-151-
153-165-082340-
MN
. MINNESOTA COUNTIES INCLUDED ARE
BROWN CHIPPEWA DOUGLAS
KANDIYOHI MCLEOD MARTIN
MEEKER NICOLLET POPE
REDWOOD RENVILLE SIBLEY
STEARNS STEVENS SWIFT
TODD WATONWAN
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 677
VALID 082140Z - 082240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 NNE YKN
TO 20 E BKX TO 20 NE VVV.
..MEAD..08/08/09
ATTN...WFO...FSD...ABR...MPX...
&&
STATUS REPORT FOR WT 677
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC119-143-082240-
IA
. IOWA COUNTIES INCLUDED ARE
LYON OSCEOLA
$$
MNC015-023-033-041-063-067-073-081-083-085-091-093-101-103-105-
117-121-127-129-133-143-145-149-151-153-165-173-082240-
MN
. MINNESOTA COUNTIES INCLUDED ARE
BROWN CHIPPEWA COTTONWOOD
DOUGLAS JACKSON KANDIYOHI
LAC QUI PARLE LINCOLN LYON
MCLEOD MARTIN MEEKER
MURRAY NICOLLET NOBLES
PIPESTONE POPE REDWOOD
RENVILLE ROCK SIBLEY
STEARNS STEVENS SWIFT
TODD WATONWAN YELLOW MEDICINE
$$
SDC027-083-099-101-125-127-082240-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CLAY LINCOLN MINNEHAHA
MOODY TURNER UNION
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 677
VALID 082045Z - 082140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 10 WNW YKN
TO 20 WNW FSD TO 20 ENE BKX TO 15 NE VVV.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1827
..SCHNEIDER..08/08/09
ATTN...WFO...FSD...ABR...MPX...
&&
STATUS REPORT FOR WT 677
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC119-143-082140-
IA
. IOWA COUNTIES INCLUDED ARE
LYON OSCEOLA
$$
MNC015-023-033-041-063-067-073-081-083-085-091-093-101-103-105-
117-121-127-129-133-143-145-149-151-153-165-173-082140-
MN
. MINNESOTA COUNTIES INCLUDED ARE
BROWN CHIPPEWA COTTONWOOD
DOUGLAS JACKSON KANDIYOHI
LAC QUI PARLE LINCOLN LYON
MCLEOD MARTIN MEEKER
MURRAY NICOLLET NOBLES
PIPESTONE POPE REDWOOD
RENVILLE ROCK SIBLEY
STEARNS STEVENS SWIFT
TODD WATONWAN YELLOW MEDICINE
$$
SDC027-083-099-101-125-127-135-082140-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
CLAY LINCOLN MINNEHAHA
MOODY TURNER UNION
YANKTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 677
VALID 081935Z - 082040Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..SCHNEIDER..08/08/09
ATTN...WFO...FSD...ABR...MPX...
&&
STATUS REPORT FOR WT 677
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC119-143-082040-
IA
. IOWA COUNTIES INCLUDED ARE
LYON OSCEOLA
$$
MNC011-015-023-033-041-063-067-073-081-083-085-091-093-101-103-
105-117-121-127-129-133-143-145-149-151-153-155-165-173-
082040-
MN
. MINNESOTA COUNTIES INCLUDED ARE
BIG STONE BROWN CHIPPEWA
COTTONWOOD DOUGLAS JACKSON
KANDIYOHI LAC QUI PARLE LINCOLN
LYON MCLEOD MARTIN
MEEKER MURRAY NICOLLET
NOBLES PIPESTONE POPE
REDWOOD RENVILLE ROCK
SIBLEY STEARNS STEVENS
SWIFT TODD TRAVERSE
WATONWAN YELLOW MEDICINE
$$
SDC009-011-029-035-039-051-057-061-067-077-079-083-087-097-099-
101-125-135-082040-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BON HOMME BROOKINGS CODINGTON
DAVISON DEUEL GRANT
HAMLIN HANSON HUTCHINSON
KINGSBURY LAKE LINCOLN
MCCOOK MINER MINNEHAHA
MOODY TURNER YANKTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Mod (60%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Mod (30%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (50%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (50%)
|
Hail
Probability of 10 or more severe hail events
|
High (80%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Mod (60%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (>95%)
|
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 
