Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 617
NWS STORM PREDICTION CENTER NORMAN OK
110 PM CDT FRI JUL 24 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
EASTERN IOWA
EXTREME NORTHWEST ILLINOIS
EXTREME SOUTHWEST WISCONSIN
EFFECTIVE THIS FRIDAY AFTERNOON FROM 110 PM UNTIL 500 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 45 STATUTE
MILES EITHER SIDE OF A LINE FROM 35 MILES WEST SOUTHWEST OF
MOLINE ILLINOIS TO 65 MILES NORTH NORTHWEST OF DUBUQUE IOWA. 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 616...
DISCUSSION...A VERY LARGE AND INTENSE SUPERCELL WAS LOCATED IN NERN
IA AND IS EXPECTED TO TRACK SSEWD THROUGH THE AFTERNOON. STRONG LOW
LEVEL SHEAR AS WELL AS A WARMING AND DESTABILIZING BOUNDARY LAYER
MAY SUPPORT A TORNADO THREAT WITH THIS LONG LIVED SUPERCELL. HAIL 3
INCHES OR LARGER IN SIZE AND WINDS IN EXCESS OF 70 MPH ARE ALSO
ANTICIPATED.
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
500. MEAN STORM MOTION VECTOR 33030.
...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 617 TORNADO IA IL WI 241810Z - 242200Z
AXIS..45 STATUTE MILES EITHER SIDE OF LINE..
35WSW MLI/MOLINE IL/ - 65NNW DBQ/DUBUQUE IA/
..AVIATION COORDS.. 40NM EITHER SIDE /27SE IOW - 40SSE ODI/
HAIL SURFACE AND ALOFT..3 INCHES. WIND GUSTS..70 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 33030.
LAT...LON 41229198 43249211 43299031 41279026
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU7.
Watch 617 Status Report Messages:
STATUS REPORT #2 ON WW 617
VALID 242155Z - 242240Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
GIVEN SCHEDULED 22Z EXPIRATION...WW 617 WILL BE
REPLACED BY A NEW WATCH SOON.
..GUYER..07/24/09
ATTN...WFO...DVN...ARX...
&&
STATUS REPORT FOR WT 617
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC161-242240-
IL
. ILLINOIS COUNTIES INCLUDED ARE
ROCK ISLAND
$$
IAC011-019-031-043-045-055-061-065-095-097-103-105-107-113-115-
139-163-183-242240-
IA
. IOWA COUNTIES INCLUDED ARE
BENTON BUCHANAN CEDAR
CLAYTON CLINTON DELAWARE
DUBUQUE FAYETTE IOWA
JACKSON JOHNSON JONES
KEOKUK LINN LOUISA
MUSCATINE SCOTT WASHINGTON
$$
WIC043-242240-
WI
. WISCONSIN COUNTIES INCLUDED ARE
GRANT
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 617
VALID 242035Z - 242140Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..GOSS..07/24/09
ATTN...WFO...DVN...ARX...
&&
STATUS REPORT FOR WT 617
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC161-242140-
IL
. ILLINOIS COUNTIES INCLUDED ARE
ROCK ISLAND
$$
IAC011-019-031-043-045-055-061-065-095-097-103-105-107-113-115-
139-163-183-242140-
IA
. IOWA COUNTIES INCLUDED ARE
BENTON BUCHANAN CEDAR
CLAYTON CLINTON DELAWARE
DUBUQUE FAYETTE IOWA
JACKSON JOHNSON JONES
KEOKUK LINN LOUISA
MUSCATINE SCOTT WASHINGTON
$$
WIC043-242140-
WI
. WISCONSIN COUNTIES INCLUDED ARE
GRANT
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Mod (50%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (20%)
|
Wind
Probability of 10 or more severe wind events
|
High (70%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (50%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (60%)
|
Probability
of 1 or
more hailstones > 2 inches
|
High (70%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (90%)
|
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.