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cat $HOME/public_html/posts/storm-prediction-center-severe-thunderstorm-watch-610.txt >> story.html | parse_story story.html; rm -f storm-prediction-center-severe-thunderstorm-watch-610.txt story.html
Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for Watch Status Reports.
SEL0
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 610
NWS Storm Prediction Center Norman OK
255 PM CDT Fri Aug 21 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Eastern Iowa
Northern and Central Illinois
Far Northwest Indiana
Southern Wisconsin
Lake Michigan
* Effective this Friday afternoon and evening from 255 PM until
1000 PM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...Scattered severe thunderstorms are forecast to develop
through the remainder of the afternoon and into the evening. A few
supercells and eventually some severe multicells organizing into a
linear cluster are expected. The threat for large hail and severe
gusts will accompany the stronger storms. A tornado is possible,
especially with a supercell favorably interacting with a stalled
outflow boundary across parts of the Watch area. This activity will
likely shift southward with time during the evening.
The severe thunderstorm watch area is approximately along and 90
statute miles east and west of a line from 20 miles east northeast
of Lonerock WI to 15 miles southeast of Bloomington IL. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU0).
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 608...WW 609...
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
33020.
...Smith
SEL0
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 610
NWS Storm Prediction Center Norman OK
255 PM CDT Fri Aug 21 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Eastern Iowa
Northern and Central Illinois
Far Northwest Indiana
Southern Wisconsin
Lake Michigan
* Effective this Friday afternoon and evening from 255 PM until
1000 PM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...Scattered severe thunderstorms are forecast to develop
through the remainder of the afternoon and into the evening. A few
supercells and eventually some severe multicells organizing into a
linear cluster are expected. The threat for large hail and severe
gusts will accompany the stronger storms. A tornado is possible,
especially with a supercell favorably interacting with a stalled
outflow boundary across parts of the Watch area. This activity will
likely shift southward with time during the evening.
The severe thunderstorm watch area is approximately along and 90
statute miles east and west of a line from 20 miles east northeast
of Lonerock WI to 15 miles southeast of Bloomington IL. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU0).
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 608...WW 609...
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
33020.
...Smith
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW0 WW 610 SEVERE TSTM IA IL IN WI LM 211955Z - 220300Z AXIS..90 STATUTE MILES EAST AND WEST OF LINE.. 20ENE LNR/LONEROCK WI/ - 15SE BMI/BLOOMINGTON IL/ ..AVIATION COORDS.. 80NM E/W /13S DLL - 35N AXC/ HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS. MAX TOPS TO 500. MEAN STORM MOTION VECTOR 33020. LAT...LON 43328802 40308701 40309043 43329160 THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS FOR WOU0.
Watch 610 Status Report Messages:
STATUS REPORT #1 ON WW 610 VALID 212050Z - 212140Z THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..MEAD..08/21/26 ATTN...WFO...ARX...DVN...LOT...ILX...MKX... && STATUS REPORT FOR WS 610 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS ILC007-011-015-031-037-043-053-057-063-073-075-085-089-091-093- 095-097-099-103-105-111-113-123-131-141-143-155-161-175-177-179- 195-197-201-203-212140- IL . ILLINOIS COUNTIES INCLUDED ARE BOONE BUREAU CARROLL COOK DE KALB DUPAGE FORD FULTON GRUNDY HENRY IROQUOIS JO DAVIESS KANE KANKAKEE KENDALL KNOX LAKE LA SALLE LEE LIVINGSTON MCHENRY MCLEAN MARSHALL MERCER OGLE PEORIA PUTNAM ROCK ISLAND STARK STEPHENSON TAZEWELL WHITESIDE WILL WINNEBAGO WOODFORD $$ INC089-111-212140- IN . INDIANA COUNTIES INCLUDED ARE LAKE NEWTON $$ IAC043-045-061-097-163-212140- IA . IOWA COUNTIES INCLUDED ARE CLAYTON CLINTON DUBUQUE JACKSON SCOTT $$ WIC025-043-045-049-055-059-065-103-105-111-127-212140- WI . WISCONSIN COUNTIES INCLUDED ARE DANE GRANT GREEN IOWA JEFFERSON KENOSHA LAFAYETTE RICHLAND ROCK SAUK WALWORTH $$ LMZ740-741-742-743-744-777-779-212140- CW . ADJACENT COASTAL WATERS INCLUDED ARE WINTHROP HARBOR TO WILMETTE HARBOR IL WILMETTE HARBOR TO NORTHERLY ISLAND IL NORTHERLY ISLAND TO CALUMET HARBOR IL CALUMET HARBOR IL TO GARY IN GARY TO BURNS HARBOR IN LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5NM OFFSHORE TO MID LAKE LAKE MICHIGAN FROM WILMETTE HARBOR TO MICHIGAN CITY IN 5NM OFFSHORE TO MID LAKE $$ THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. $$
Note:
Click for Complete Product Text.
Tornadoes
| Probability of 2 or more tornadoes |
Low (20%) |
| Probability of 1 or more strong (EF2-EF5) tornadoes |
Low ( |
Wind
| Probability of 10 or more severe wind events |
Mod (40%) |
| Probability of 1 or more wind events > 65 knots |
Low (20%) |
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 (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.