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 428
NWS Storm Prediction Center Norman OK
255 PM CDT Mon Aug 10 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central Illinois
East-central and northeast Missouri
* Effective this Monday afternoon and evening from 255 PM until
1000 PM CDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph likely
Isolated large hail events to 1.5 inches in diameter possible
SUMMARY...Several multicell clusters should develop east from
central and northeast Missouri. These clusters will largely pose a
risk for strong to isolated severe gusts, yielding scattered
damaging winds as they spread into central Illinois through this
evening.
The severe thunderstorm watch area is approximately along and 115
statute miles east and west of a line from 50 miles east southeast
of Jefferson City MO to 35 miles north of Springfield 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 426...WW 427...
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 550. Mean storm motion vector
29025.
...Grams
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 428
NWS Storm Prediction Center Norman OK
255 PM CDT Mon Aug 10 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central Illinois
East-central and northeast Missouri
* Effective this Monday afternoon and evening from 255 PM until
1000 PM CDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph likely
Isolated large hail events to 1.5 inches in diameter possible
SUMMARY...Several multicell clusters should develop east from
central and northeast Missouri. These clusters will largely pose a
risk for strong to isolated severe gusts, yielding scattered
damaging winds as they spread into central Illinois through this
evening.
The severe thunderstorm watch area is approximately along and 115
statute miles east and west of a line from 50 miles east southeast
of Jefferson City MO to 35 miles north of Springfield 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 426...WW 427...
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 550. Mean storm motion vector
29025.
...Grams
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW8
WW 428 SEVERE TSTM IL MO 101955Z - 110300Z
AXIS..115 STATUTE MILES EAST AND WEST OF LINE..
50ESE JEF/JEFFERSON CITY MO/ - 35N SPI/SPRINGFIELD IL/
..AVIATION COORDS.. 100NM E/W /50SW STL - 48S BDF/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 29025.
LAT...LON 38309342 40349186 40348750 38308918
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU8.
Watch 428 Status Report Messages:
STATUS REPORT #3 ON WW 428
VALID 110040Z - 110140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 NW FAM TO
5 SE BLV TO 10 N SLO TO 40 SSE MTO TO 25 S HUF.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1464
..COOK..08/11/20
ATTN...WFO...LSX...ILX...EAX...
&&
STATUS REPORT FOR WS 428
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC025-033-079-101-121-159-110140-
IL
. ILLINOIS COUNTIES INCLUDED ARE
CLAY CRAWFORD JASPER
LAWRENCE MARION RICHLAND
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 428
VALID 102345Z - 110040Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 SW JEF TO
15 W STL TO 30 SW MTO TO 5 W HUF.
..COOK..08/10/20
ATTN...WFO...LSX...ILX...EAX...
&&
STATUS REPORT FOR WS 428
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC005-025-027-033-049-051-079-101-119-121-133-159-163-189-
110040-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BOND CLAY CLINTON
CRAWFORD EFFINGHAM FAYETTE
JASPER LAWRENCE MADISON
MARION MONROE RICHLAND
ST. CLAIR WASHINGTON
$$
MOC071-073-099-151-183-189-510-110040-
MO
. MISSOURI COUNTIES INCLUDED ARE
FRANKLIN GASCONADE JEFFERSON
OSAGE ST. CHARLES ST. LOUIS
MISSOURI INDEPENDENT CITIES INCLUDED ARE
ST. LOUIS CITY
$$
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.
$$
STATUS REPORT #1 ON WW 428
VALID 102235Z - 102340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 ENE SZL
TO 20 N COU TO 35 SSE UIN TO 15 SSW SPI TO 10 SSE CMI TO 10 SE
DNV TO 10 WNW LAF.
..COOK..08/10/20
ATTN...WFO...LSX...ILX...EAX...
&&
STATUS REPORT FOR WS 428
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC005-013-021-023-025-027-029-033-035-041-045-049-051-061-079-
083-101-117-119-121-133-135-139-147-159-163-173-189-102340-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BOND CALHOUN CHRISTIAN
CLARK CLAY CLINTON
COLES CRAWFORD CUMBERLAND
DOUGLAS EDGAR EFFINGHAM
FAYETTE GREENE JASPER
JERSEY LAWRENCE MACOUPIN
MADISON MARION MONROE
MONTGOMERY MOULTRIE PIATT
RICHLAND ST. CLAIR SHELBY
WASHINGTON
$$
MOC027-051-071-073-099-113-135-139-151-183-189-219-510-102340-
MO
. MISSOURI COUNTIES INCLUDED ARE
CALLAWAY COLE FRANKLIN
GASCONADE JEFFERSON LINCOLN
MONITEAU MONTGOMERY OSAGE
ST. CHARLES ST. LOUIS WARREN
MISSOURI INDEPENDENT CITIES INCLUDED ARE
ST. LOUIS CITY
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (<5%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (60%)
|
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 (10%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (80%)
|
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.
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