Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL5
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 355
NWS Storm Prediction Center Norman OK
1000 AM CDT Sat Jul 11 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Eastern Iowa
Northwest Illinois
* Effective this Saturday morning and afternoon from 1000 AM
until 400 PM CDT.
* Primary threats include...
Isolated very large hail events to 2 inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...A small but intense storm cluster may persist
southeastward and somewhat increase in size/coverage late this
morning through early afternoon as it moves across eastern Iowa
toward the Quad Cities vicinity. Large hail and damaging winds will
be possible, at least on an isolated basis.
The severe thunderstorm watch area is approximately along and 55
statute miles north and south of a line from 35 miles southwest of
Cedar Rapids IA to 45 miles east of Moline IL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU5).
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.
&&
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
32030.
...Guyer
SEL5
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 355
NWS Storm Prediction Center Norman OK
1000 AM CDT Sat Jul 11 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Eastern Iowa
Northwest Illinois
* Effective this Saturday morning and afternoon from 1000 AM
until 400 PM CDT.
* Primary threats include...
Isolated very large hail events to 2 inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...A small but intense storm cluster may persist
southeastward and somewhat increase in size/coverage late this
morning through early afternoon as it moves across eastern Iowa
toward the Quad Cities vicinity. Large hail and damaging winds will
be possible, at least on an isolated basis.
The severe thunderstorm watch area is approximately along and 55
statute miles north and south of a line from 35 miles southwest of
Cedar Rapids IA to 45 miles east of Moline IL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU5).
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.
&&
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
32030.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW5
WW 355 SEVERE TSTM IA IL 111500Z - 112100Z
AXIS..55 STATUTE MILES NORTH AND SOUTH OF LINE..
35SW CID/CEDAR RAPIDS IA/ - 45E MLI/MOLINE IL/
..AVIATION COORDS.. 50NM N/S /26W IOW - 17N BDF/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 32030.
LAT...LON 42329220 42248963 40658963 40729220
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU5.
Watch 355 Status Report Messages:
STATUS REPORT #1 ON WW 355
VALID 111640Z - 111740Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..KERR..07/11/20
ATTN...WFO...DVN...ILX...
&&
STATUS REPORT FOR WS 355
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC071-073-095-131-161-175-187-111740-
IL
. ILLINOIS COUNTIES INCLUDED ARE
HENDERSON HENRY KNOX
MERCER ROCK ISLAND STARK
WARREN
$$
IAC011-031-045-057-087-095-097-103-105-113-115-139-163-183-
111740-
IA
. IOWA COUNTIES INCLUDED ARE
BENTON CEDAR CLINTON
DES MOINES HENRY IOWA
JACKSON JOHNSON JONES
LINN LOUISA MUSCATINE
SCOTT WASHINGTON
$$
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 (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Low (10%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (30%)
|
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% (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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