Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 487
NWS Storm Prediction Center Norman OK
255 AM CDT Sun Sep 6 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central and Eastern Iowa
Northern Illinois
* Effective this Sunday morning from 255 AM until 900 AM 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
SUMMARY...Multiple rounds of storms will persist overnight across
the region, with a more organized linear-type complex potentially
evolving through the early morning hours. Severe hail and locally
damaging wind will be possible as storms steadily progress
southeastward through the early morning hours.
The severe thunderstorm watch area is approximately along and 60
statute miles north and south of a line from 15 miles north of Fort
Dodge IA to 60 miles east of Moline IL. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU7).
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 486...
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 600. Mean storm motion vector
29035.
...Guyer
SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 487
NWS Storm Prediction Center Norman OK
255 AM CDT Sun Sep 6 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central and Eastern Iowa
Northern Illinois
* Effective this Sunday morning from 255 AM until 900 AM 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
SUMMARY...Multiple rounds of storms will persist overnight across
the region, with a more organized linear-type complex potentially
evolving through the early morning hours. Severe hail and locally
damaging wind will be possible as storms steadily progress
southeastward through the early morning hours.
The severe thunderstorm watch area is approximately along and 60
statute miles north and south of a line from 15 miles north of Fort
Dodge IA to 60 miles east of Moline IL. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU7).
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 486...
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 600. Mean storm motion vector
29035.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW7
WW 487 SEVERE TSTM IA IL 060755Z - 061400Z
AXIS..60 STATUTE MILES NORTH AND SOUTH OF LINE..
15N FOD/FORT DODGE IA/ - 60E MLI/MOLINE IL/
..AVIATION COORDS.. 50NM N/S /10NNE FOD - 20NNE BDF/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 600. MEAN STORM MOTION VECTOR 29035.
LAT...LON 43649420 42318934 40588934 41909420
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU7.
Watch 487 Status Report Messages:
STATUS REPORT #3 ON WW 487
VALID 061230Z - 061340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 N OTM TO
10 SSE CID TO 30 WNW MMO.
..MOSIER..09/06/20
ATTN...WFO...DVN...DMX...ILX...LOT...
&&
STATUS REPORT FOR WS 487
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC011-039-073-095-099-105-107-113-123-131-143-155-161-175-179-
203-061340-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BUREAU DE WITT HENRY
KNOX LA SALLE LIVINGSTON
LOGAN MCLEAN MARSHALL
MERCER PEORIA PUTNAM
ROCK ISLAND STARK TAZEWELL
WOODFORD
$$
IAC103-107-115-139-163-183-061340-
IA
. IOWA COUNTIES INCLUDED ARE
JOHNSON KEOKUK LOUISA
MUSCATINE SCOTT WASHINGTON
$$
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.
$$
STATUS REPORT #2 ON WW 487
VALID 061050Z - 061140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 S FOD TO
20 NE MCW.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1679
..MOSIER..09/06/20
ATTN...WFO...DVN...DMX...ILX...LOT...
&&
STATUS REPORT FOR WS 487
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC011-015-073-085-095-099-103-123-131-141-155-161-175-177-195-
061140-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BUREAU CARROLL HENRY
JO DAVIESS KNOX LA SALLE
LEE MARSHALL MERCER
OGLE PUTNAM ROCK ISLAND
STARK STEPHENSON WHITESIDE
$$
IAC011-013-017-019-023-031-033-045-055-061-069-075-079-083-095-
097-099-103-105-107-113-115-123-127-139-157-163-169-171-183-197-
061140-
IA
. IOWA COUNTIES INCLUDED ARE
BENTON BLACK HAWK BREMER
BUCHANAN BUTLER CEDAR
CERRO GORDO CLINTON DELAWARE
DUBUQUE FRANKLIN GRUNDY
HAMILTON HARDIN IOWA
JACKSON JASPER JOHNSON
JONES KEOKUK LINN
LOUISA MAHASKA MARSHALL
MUSCATINE POWESHIEK SCOTT
STORY TAMA WASHINGTON
WRIGHT
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 487
VALID 060930Z - 061040Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..MOSIER..09/06/20
ATTN...WFO...DVN...DMX...ILX...LOT...
&&
STATUS REPORT FOR WS 487
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC011-015-073-085-095-099-103-123-131-141-155-161-175-177-195-
061040-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BUREAU CARROLL HENRY
JO DAVIESS KNOX LA SALLE
LEE MARSHALL MERCER
OGLE PUTNAM ROCK ISLAND
STARK STEPHENSON WHITESIDE
$$
IAC011-013-015-017-019-023-031-033-045-055-061-069-075-079-081-
083-091-095-097-099-103-105-107-109-113-115-123-127-139-153-157-
163-169-171-183-187-189-195-197-061040-
IA
. IOWA COUNTIES INCLUDED ARE
BENTON BLACK HAWK BOONE
BREMER BUCHANAN BUTLER
CEDAR CERRO GORDO CLINTON
DELAWARE DUBUQUE FRANKLIN
GRUNDY HAMILTON HANCOCK
HARDIN HUMBOLDT IOWA
JACKSON JASPER JOHNSON
JONES KEOKUK KOSSUTH
LINN LOUISA MAHASKA
MARSHALL MUSCATINE POLK
POWESHIEK SCOTT STORY
TAMA WASHINGTON WEBSTER
WINNEBAGO WORTH WRIGHT
$$
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 (5%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (40%)
|
Probability of 1 or more wind events > 65 knots
|
Low (10%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (50%)
|
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 (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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