Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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Watch Status Reports.
SEL5
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 655
NWS STORM PREDICTION CENTER NORMAN OK
740 AM CDT TUE AUG 4 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL ILLINOIS
EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 740 AM UNTIL
100 PM CDT.
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 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST
NORTHWEST OF SPRINGFIELD ILLINOIS TO 30 MILES SOUTH OF DANVILLE
ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).
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 654...
DISCUSSION...STORMS WILL LIKELY CONTINUE DEVELOPING EWD ALONG
CONVECTIVE OUTFLOW BOUNDARY WHERE THE 12Z LINCOLN IL RAOB INDICATES
5000 J/KG MLCAPE...STEEP LAPSE RATES AND ONLY MODEST CONVECTIVE
INHIBITION. UNIDIRECTIONAL WLY BULK SHEAR OF 30-35 KT WILL SUPPORT
POTENTIAL FOR EMBEDDED ORGANIZED STORM STRUCTURES WITH DAMAGING WIND
AND LARGE HAIL THE MAIN THREATS.
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 500. MEAN STORM
MOTION VECTOR 25035.
...DIAL
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW5
WW 655 SEVERE TSTM IL 041240Z - 041800Z
AXIS..60 STATUTE MILES NORTH AND SOUTH OF LINE..
50WNW SPI/SPRINGFIELD IL/ - 30S DNV/DANVILLE IL/
..AVIATION COORDS.. 50NM N/S /37ENE UIN - 23NW TTH/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 25035.
LAT...LON 40999055 40638759 38908759 39259055
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU5.
Watch 655 Status Report Messages:
STATUS REPORT #3 ON WW 655
VALID 041540Z - 041640Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 NE SLO TO
45 ENE BMI.
..KERR..08/04/09
ATTN...WFO...LSX...ILX...LOT...
&&
STATUS REPORT FOR WS 655
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC019-023-025-029-033-035-041-045-049-075-079-101-159-183-
041640-
IL
. ILLINOIS COUNTIES INCLUDED ARE
CHAMPAIGN CLARK CLAY
COLES CRAWFORD CUMBERLAND
DOUGLAS EDGAR EFFINGHAM
IROQUOIS JASPER LAWRENCE
RICHLAND VERMILION
$$
INC007-041640-
IN
. INDIANA COUNTIES INCLUDED ARE
BENTON
$$
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.
$$
STATUS REPORT #2 ON WW 655
VALID 041430Z - 041540Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 ENE ALN
TO 15 NNE PIA.
..KERR..08/04/09
ATTN...WFO...LSX...ILX...LOT...
&&
STATUS REPORT FOR WS 655
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC019-021-023-025-029-033-035-039-041-045-049-051-053-075-079-
101-105-107-113-115-123-135-139-143-147-159-173-175-179-183-203-
041540-
IL
. ILLINOIS COUNTIES INCLUDED ARE
CHAMPAIGN CHRISTIAN CLARK
CLAY COLES CRAWFORD
CUMBERLAND DE WITT DOUGLAS
EDGAR EFFINGHAM FAYETTE
FORD IROQUOIS JASPER
LAWRENCE LIVINGSTON LOGAN
MCLEAN MACON MARSHALL
MONTGOMERY MOULTRIE PEORIA
PIATT RICHLAND SHELBY
STARK TAZEWELL VERMILION
WOODFORD
$$
INC007-041540-
IN
. INDIANA COUNTIES INCLUDED ARE
BENTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 655
VALID 041335Z - 041440Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..KERR..08/04/09
ATTN...WFO...LSX...ILX...LOT...
&&
STATUS REPORT FOR WS 655
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC005-017-019-021-023-029-035-039-041-045-051-053-057-075-095-
105-107-113-115-117-119-123-125-129-135-137-139-143-147-167-169-
171-173-175-179-183-203-041440-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BOND CASS CHAMPAIGN
CHRISTIAN CLARK COLES
CUMBERLAND DE WITT DOUGLAS
EDGAR FAYETTE FORD
FULTON IROQUOIS KNOX
LIVINGSTON LOGAN MCLEAN
MACON MACOUPIN MADISON
MARSHALL MASON MENARD
MONTGOMERY MORGAN MOULTRIE
PEORIA PIATT SANGAMON
SCHUYLER SCOTT SHELBY
STARK TAZEWELL VERMILION
WOODFORD
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (20%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (5%)
|
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 (40%)
|
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 (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 
