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The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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Watch Status Reports.
SEL5
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 275
NWS STORM PREDICTION CENTER NORMAN OK
615 PM CDT FRI MAY 8 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EASTERN IOWA
NORTHWEST ILLINOIS
SOUTHWEST WISCONSIN
EFFECTIVE THIS FRIDAY NIGHT FROM 615 PM UNTIL MIDNIGHT CDT.
HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH OF
DUBUQUE IOWA TO 40 MILES SOUTH SOUTHWEST OF MOLINE ILLINOIS. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU5).
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 268...WW 270...WW
271...WW 272...WW 273...WW 274...
DISCUSSION...TSTMS EXPECTED TO PERSIST THROUGH THE EVE IN AREA OF
STRONG LOW TO MID LVL ASCENT AHEAD OF STRONG VORT CROSSING NRN IA.
STRENGTH OF WIND FIELD...CONCENTRATED LOW LVL CONVERGENCE...AND COOL
MID LVL TEMPERATURES SUGGEST A CONTINUED THREAT FOR SVR
WIND/HAIL...DESPITE LIMITED MOISTURE INFLOW.
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 400. MEAN STORM
MOTION VECTOR 26045.
...CORFIDI/JEWELL
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW5
WW 275 SEVERE TSTM IA IL WI 082310Z - 090500Z
AXIS..75 STATUTE MILES EAST AND WEST OF LINE..
35N DBQ/DUBUQUE IA/ - 40SSW MLI/MOLINE IL/
..AVIATION COORDS.. 65NM E/W /30N DBQ - 52SE IOW/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 400. MEAN STORM MOTION VECTOR 26045.
LAT...LON 42908923 40908936 40909223 42909219
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU5.
Watch 275 Status Report Messages:
STATUS REPORT #3 ON WW 275
VALID 090230Z - 090340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 10 NE BRL TO
20 SSE MLI TO 30 E MLI TO 25 W RFD TO 10 S MSN.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 769
..JEWELL..05/09/09
ATTN...WFO...DVN...ARX...ILX...LOT...MKX...
&&
STATUS REPORT FOR WS 275
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC011-071-095-103-123-141-143-155-175-187-201-090340-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BUREAU HENDERSON KNOX
LEE MARSHALL OGLE
PEORIA PUTNAM STARK
WARREN WINNEBAGO
$$
WIC105-090340-
WI
. WISCONSIN COUNTIES INCLUDED ARE
ROCK
$$
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.
$$
STATUS REPORT #2 ON WW 275
VALID 090145Z - 090240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 WNW BRL
TO 25 N BRL TO 20 SW MLI TO 15 NNE MLI TO 45 SE DBQ TO 35 ENE DBQ
TO 20 SSE LNR.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 769
..JEWELL..05/09/09
ATTN...WFO...DVN...ARX...ILX...LOT...MKX...
&&
STATUS REPORT FOR WS 275
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC011-015-071-073-095-103-123-131-141-143-155-161-175-177-187-
195-201-090240-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BUREAU CARROLL HENDERSON
HENRY KNOX LEE
MARSHALL MERCER OGLE
PEORIA PUTNAM ROCK ISLAND
STARK STEPHENSON WARREN
WHITESIDE WINNEBAGO
$$
IAC057-087-111-115-163-090240-
IA
. IOWA COUNTIES INCLUDED ARE
DES MOINES HENRY LEE
LOUISA SCOTT
$$
WIC045-105-090240-
WI
. WISCONSIN COUNTIES INCLUDED ARE
GREEN ROCK
$$
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.
$$
STATUS REPORT #1 ON WW 275
VALID 090030Z - 090140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 NNE OTM
TO 30 SSE CID TO 35 E CID TO 25 WSW DBQ TO 45 W LNR.
..JEWELL..05/09/09
ATTN...WFO...DVN...ARX...ILX...LOT...MKX...
&&
STATUS REPORT FOR WS 275
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC011-015-071-073-085-095-103-123-131-141-143-155-161-175-177-
187-195-201-090140-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BUREAU CARROLL HENDERSON
HENRY JO DAVIESS KNOX
LEE MARSHALL MERCER
OGLE PEORIA PUTNAM
ROCK ISLAND STARK STEPHENSON
WARREN WHITESIDE WINNEBAGO
$$
IAC031-045-057-061-087-097-101-105-107-111-115-139-163-177-183-
090140-
IA
. IOWA COUNTIES INCLUDED ARE
CEDAR CLINTON DES MOINES
DUBUQUE HENRY JACKSON
JEFFERSON JONES KEOKUK
LEE LOUISA MUSCATINE
SCOTT VAN BUREN WASHINGTON
$$
WIC043-045-065-105-090140-
WI
. WISCONSIN COUNTIES INCLUDED ARE
GRANT GREEN LAFAYETTE
ROCK
$$
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 (F2-F5) tornadoes
|
Low (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (50%)
|
Probability of 1 or more wind events > 65 knots
|
Low (20%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (30%)
|
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 (>95%)
|
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% (F2-F5 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 
