Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 578
NWS Storm Prediction Center Norman OK
550 AM CDT Wed Jul 31 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central and South-Central Illinois
* Effective this Wednesday morning from 550 AM until NOON CDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph likely
Isolated large hail events to 1.5 inches in diameter possible
SUMMARY...A cluster of storms will move southeastward across the
region this morning with wind damage possible.
The severe thunderstorm watch area is approximately along and 65
statute miles north and south of a line from 65 miles west northwest
of Springfield IL to 35 miles east of Mattoon IL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU8).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 576...WW 577...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
30040.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW8
WW 578 SEVERE TSTM IL 311050Z - 311700Z
AXIS..65 STATUTE MILES NORTH AND SOUTH OF LINE..
65WNW SPI/SPRINGFIELD IL/ - 35E MTO/MATTOON IL/
..AVIATION COORDS.. 55NM N/S /30NE UIN - 17W TTH/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 30040.
LAT...LON 41159082 40418762 38538762 39259082
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU8.
Watch 578 Status Report Messages:
STATUS REPORT #4 ON WW 578
VALID 311550Z - 311640Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 NE SLO TO
10 S DEC TO 5 WSW HUF.
..LEITMAN..07/31/24
ATTN...WFO...LSX...ILX...
&&
STATUS REPORT FOR WS 578
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC023-025-029-033-035-049-079-101-139-159-173-311640-
IL
. ILLINOIS COUNTIES INCLUDED ARE
CLARK CLAY COLES
CRAWFORD CUMBERLAND EFFINGHAM
JASPER LAWRENCE MOULTRIE
RICHLAND SHELBY
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 578
VALID 311500Z - 311640Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 SSE UIN
TO 15 NE SPI TO 20 E CMI TO 15 ENE DNV.
..LEITMAN..07/31/24
ATTN...WFO...LSX...ILX...
&&
STATUS REPORT FOR WS 578
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC005-013-021-023-025-029-033-035-041-045-049-051-061-079-083-
101-107-115-117-121-135-137-139-147-149-159-167-171-173-
311640-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BOND CALHOUN CHRISTIAN
CLARK CLAY COLES
CRAWFORD CUMBERLAND DOUGLAS
EDGAR EFFINGHAM FAYETTE
GREENE JASPER JERSEY
LAWRENCE LOGAN MACON
MACOUPIN MARION MONTGOMERY
MORGAN MOULTRIE PIATT
PIKE RICHLAND SANGAMON
SCOTT SHELBY
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 578
VALID 311350Z - 311440Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 NNE UIN
TO 20 S BMI TO 25 NE BMI.
..LEITMAN..07/31/24
ATTN...WFO...LSX...ILX...
&&
STATUS REPORT FOR WS 578
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC005-009-013-017-019-021-023-025-029-033-035-039-041-045-049-
051-061-079-083-101-107-115-117-121-125-129-135-137-139-147-149-
159-167-169-171-173-183-311440-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BOND BROWN CALHOUN
CASS CHAMPAIGN CHRISTIAN
CLARK CLAY COLES
CRAWFORD CUMBERLAND DE WITT
DOUGLAS EDGAR EFFINGHAM
FAYETTE GREENE JASPER
JERSEY LAWRENCE LOGAN
MACON MACOUPIN MARION
MASON MENARD MONTGOMERY
MORGAN MOULTRIE PIATT
PIKE RICHLAND SANGAMON
SCHUYLER SCOTT SHELBY
VERMILION
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 578
VALID 311240Z - 311340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 ESE BRL
TO 30 SW PIA TO 20 N PIA.
..GRAMS..07/31/24
ATTN...WFO...LSX...ILX...
&&
STATUS REPORT FOR WS 578
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC005-009-013-017-019-021-023-025-029-033-035-039-041-045-049-
051-057-061-079-083-101-107-113-115-117-121-125-129-135-137-139-
143-147-149-159-167-169-171-173-179-183-203-311340-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BOND BROWN CALHOUN
CASS CHAMPAIGN CHRISTIAN
CLARK CLAY COLES
CRAWFORD CUMBERLAND DE WITT
DOUGLAS EDGAR EFFINGHAM
FAYETTE FULTON GREENE
JASPER JERSEY LAWRENCE
LOGAN MCLEAN MACON
MACOUPIN MARION MASON
MENARD MONTGOMERY MORGAN
MOULTRIE PEORIA PIATT
PIKE RICHLAND SANGAMON
SCHUYLER SCOTT SHELBY
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 (10%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (10%)
|
Wind
Probability of 10 or more severe wind events
|
High (70%)
|
Probability of 1 or more wind events > 65 knots
|
Low (20%)
|
Hail
Probability of 10 or more severe hail events
|
Low (20%)
|
Probability of 1 or more hailstones > 2 inches
|
Low (<5%)
|
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% (EF2-EF5 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 
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