Severe Thunderstorm Warning 154, NWS Quad Cities, IA

278 
WWUS53 KDVN 192355
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
655 PM CDT WED JUL 19 2017

ILC015-085-177-IAC061-097-200100-
/O.CON.KDVN.SV.W.0154.000000T0000Z-170720T0100Z/
Jo Daviess IL-Carroll IL-Stephenson IL-Jackson IA-Dubuque IA-
655 PM CDT WED JUL 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR JO DAVIESS...CARROLL...STEPHENSON...CENTRAL JACKSON AND
SOUTHEASTERN DUBUQUE COUNTIES...

At 654 PM CDT, severe thunderstorms were located along a line
extending from 9 miles north of Belmont to near Menominee to near
Bernard, moving southeast at 60 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

Locations impacted include...
Dubuque, Freeport, Galena, Mount Carroll, Savanna, Lena, Bellevue,
Stockton, East Dubuque, Lanark, Warren, Milledgeville, Hanover, Pearl
City, Elizabeth, Shannon, Cedarville, Davis, Woodbine and Sabula.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across southern Grant county. SEEK SHELTER NOW inside a 
sturdy structure and stay away from windows.
 
&&

LAT...LON 4220 8940 4220 8969 4193 8969 4201 9014
      4203 9016 4203 9023 4230 9090 4244 9069
      4251 9068 4250 8940
TIME...MOT...LOC 2354Z 296DEG 53KT 4287 9038 4246 9056 4236 9092 

HAIL...<.75IN
WIND...70MPH
 
$$

ERVIN

113 
WWUS53 KDVN 200006
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
706 PM CDT WED JUL 19 2017

ILC015-085-177-IAC061-097-200100-
/O.CON.KDVN.SV.W.0154.000000T0000Z-170720T0100Z/
Jo Daviess IL-Carroll IL-Stephenson IL-Jackson IA-Dubuque IA-
706 PM CDT WED JUL 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR JO DAVIESS...CARROLL...STEPHENSON...CENTRAL JACKSON AND
SOUTHEASTERN DUBUQUE COUNTIES...

At 705 PM CDT, severe thunderstorms were located along a line
extending from near Mineral Point to Galena to near Zwingle, moving
east at 55 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

Locations impacted include...
Dubuque, Freeport, Galena, Mount Carroll, Savanna, Lena, Bellevue,
Stockton, East Dubuque, Lanark, Warren, Milledgeville, Hanover, Pearl
City, Elizabeth, Shannon, Cedarville, Davis, Woodbine and Sabula.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across Grant county. SEEK SHELTER NOW inside a sturdy 
structure and stay away from windows.
 
&&

LAT...LON 4220 8940 4220 8969 4193 8969 4201 9014
      4203 9016 4203 9023 4230 9090 4244 9069
      4251 9068 4250 8940
TIME...MOT...LOC 0005Z 292DEG 50KT 4281 9022 4244 9041 4237 9073 

HAIL...<.75IN
WIND...70MPH
 
$$

ERVIN

170 
WWUS53 KDVN 200011
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
711 PM CDT WED JUL 19 2017

ILC015-085-177-IAC061-097-200100-
/O.CON.KDVN.SV.W.0154.000000T0000Z-170720T0100Z/
Jo Daviess IL-Carroll IL-Stephenson IL-Jackson IA-Dubuque IA-
711 PM CDT WED JUL 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR JO DAVIESS...CARROLL...STEPHENSON...CENTRAL JACKSON AND
SOUTHEASTERN DUBUQUE COUNTIES...

At 710 PM CDT, severe thunderstorms were located along a line
extending from near Mineral Point to near Schapville to near St.
Donatus, moving southeast at 70 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

Locations impacted include...
Dubuque, Freeport, Galena, Mount Carroll, Savanna, Lena, Bellevue,
Stockton, East Dubuque, Lanark, Warren, Milledgeville, Hanover, Pearl
City, Elizabeth, Shannon, Cedarville, Davis, Woodbine and Sabula.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across the highway 20 corridor in Iowa and over Grant 
county. SEEK SHELTER NOW inside a sturdy structure and stay away 
from windows.
 
&&

LAT...LON 4220 8940 4220 8969 4193 8969 4201 9014
      4203 9016 4203 9023 4230 9090 4244 9069
      4251 9068 4250 8940
TIME...MOT...LOC 0010Z 293DEG 62KT 4281 9012 4242 9025 4237 9063 

HAIL...<.75IN
WIND...70MPH
 
$$

ERVIN

688 
WWUS53 KDVN 200017
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
717 PM CDT WED JUL 19 2017

ILC015-085-177-IAC061-097-200100-
/O.CON.KDVN.SV.W.0154.000000T0000Z-170720T0100Z/
Jo Daviess IL-Carroll IL-Stephenson IL-Jackson IA-Dubuque IA-
717 PM CDT WED JUL 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR JO DAVIESS...CARROLL...STEPHENSON...CENTRAL JACKSON AND
SOUTHEASTERN DUBUQUE COUNTIES...

At 717 PM CDT, severe thunderstorms were located along a line
extending from 6 miles west of Blanchardville to near Apple River to
near Bellevue, moving east at 65 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

Locations impacted include...
Dubuque, Freeport, Galena, Mount Carroll, Savanna, Lena, Bellevue,
Stockton, East Dubuque, Lanark, Warren, Milledgeville, Hanover, Pearl
City, Elizabeth, Shannon, Cedarville, Davis, Woodbine and Sabula.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across Dubuque and Grant counties. SEEK SHELTER NOW 
inside a sturdy structure and stay away from windows.
 
&&

LAT...LON 4220 8940 4220 8969 4193 8969 4201 9014
      4203 9016 4203 9023 4230 9090 4244 9069
      4251 9068 4250 8940
TIME...MOT...LOC 0017Z 286DEG 59KT 4280 8998 4244 9009 4231 9046 

HAIL...<.75IN
WIND...70MPH
 
$$

ERVIN

594 
WWUS53 KDVN 200022
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
722 PM CDT WED JUL 19 2017

ILC015-085-177-IAC061-097-200100-
/O.CON.KDVN.SV.W.0154.000000T0000Z-170720T0100Z/
Jo Daviess IL-Carroll IL-Stephenson IL-Jackson IA-Dubuque IA-
722 PM CDT WED JUL 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR JO DAVIESS...CARROLL...STEPHENSON...CENTRAL JACKSON AND
SOUTHEASTERN DUBUQUE COUNTIES...

At 721 PM CDT, severe thunderstorms were located along a line
extending from near Blanchardville to near Nora to near Bellevue,
moving southeast at 65 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

Locations impacted include...
Freeport, Galena, Mount Carroll, Savanna, Lena, Bellevue, Stockton,
Lanark, Warren, Milledgeville, Hanover, Pearl City, Elizabeth,
Shannon, Cedarville, Davis, Woodbine, Sabula, Chadwick and Dakota.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
sturdy building.

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across Dubuque and Grant counties. SEEK SHELTER NOW 
inside a sturdy structure and stay away from windows.
 
&&

LAT...LON 4220 8940 4220 8969 4193 8969 4201 9014
      4203 9016 4203 9023 4230 9090 4244 9069
      4251 9049 4250 8940
TIME...MOT...LOC 0021Z 295DEG 54KT 4278 8993 4242 9001 4229 9041 

HAIL...<.75IN
WIND...70MPH
 
$$

ERVIN

469 
WWUS53 KDVN 200028
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
728 PM CDT WED JUL 19 2017

ILC015-085-177-IAC061-097-200100-
/O.CON.KDVN.SV.W.0154.000000T0000Z-170720T0100Z/
Jo Daviess IL-Carroll IL-Stephenson IL-Jackson IA-Dubuque IA-
728 PM CDT WED JUL 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR JO DAVIESS...CARROLL...STEPHENSON...CENTRAL JACKSON AND
SOUTHEASTERN DUBUQUE COUNTIES...

At 728 PM CDT, severe thunderstorms were located along a line
extending from near Monticello to near Pearl City to near
Springbrook, moving southeast at 65 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

Locations impacted include...
Freeport, Galena, Mount Carroll, Savanna, Lena, Bellevue, Stockton,
Lanark, Warren, Milledgeville, Hanover, Pearl City, Elizabeth,
Shannon, Cedarville, Davis, Woodbine, Sabula, Chadwick and Dakota.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across extreme northwest Illinois. SEEK SHELTER NOW 
inside a sturdy structure and stay away from windows.
 
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4220 8940 4220 8969 4193 8969 4201 9014
      4203 9016 4203 9023 4230 9090 4244 9069
      4251 9049 4250 8940
TIME...MOT...LOC 0028Z 305DEG 57KT 4272 8969 4228 8992 4221 9047 

HAIL...<.75IN
WIND...70MPH
 
$$

ERVIN

014 
WWUS53 KDVN 200038
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
738 PM CDT WED JUL 19 2017

IAC061-200048-
/O.CAN.KDVN.SV.W.0154.000000T0000Z-170720T0100Z/
Dubuque IA-
738 PM CDT WED JUL 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DUBUQUE COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until midnight CDT for
northwestern Illinois...and northeastern and east central Iowa.

LAT...LON 4250 8940 4220 8940 4220 8969 4193 8969
      4201 9014 4203 9016 4203 9023 4229 9089
      4230 9067 4234 9066 4239 9033 4251 9006
TIME...MOT...LOC 0038Z 294DEG 55KT 4266 8953 4223 8973 4210 9017 

$$

ILC015-085-177-IAC097-200100-
/O.CON.KDVN.SV.W.0154.000000T0000Z-170720T0100Z/
Jo Daviess IL-Carroll IL-Stephenson IL-Jackson IA-
738 PM CDT WED JUL 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR JO DAVIESS...CARROLL...STEPHENSON AND CENTRAL JACKSON COUNTIES...

At 738 PM CDT, severe thunderstorms were located along a line
extending from near Albany to near Pearl City to Savanna, moving
southeast at 65 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

Locations impacted include...
Freeport, Mount Carroll, Savanna, Lena, Bellevue, Stockton, Lanark,
Warren, Milledgeville, Hanover, Pearl City, Elizabeth, Shannon,
Cedarville, Davis, Woodbine, Sabula, Chadwick, Dakota and German
Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
sturdy building.

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across southwest Wisconsin. SEEK SHELTER NOW inside a 
sturdy structure and stay away from windows.
 
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4250 8940 4220 8940 4220 8969 4193 8969
      4201 9014 4203 9016 4203 9023 4229 9089
      4230 9067 4234 9066 4239 9033 4251 9006
TIME...MOT...LOC 0038Z 294DEG 55KT 4266 8953 4223 8973 4210 9017 

HAIL...<.75IN
WIND...70MPH
 
$$

ERVIN

360 
WWUS53 KDVN 200046
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
746 PM CDT WED JUL 19 2017

ILC085-IAC097-200055-
/O.CAN.KDVN.SV.W.0154.000000T0000Z-170720T0100Z/
Jo Daviess IL-Jackson IA-
746 PM CDT WED JUL 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR JO DAVIESS AND CENTRAL JACKSON
COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until midnight CDT for
northwestern Illinois...and east central Iowa.

LAT...LON 4220 8940 4220 8969 4193 8969 4201 9014
      4204 9017 4211 9016 4218 9000 4220 8999
      4220 8992 4231 8992 4250 8966 4250 8940
TIME...MOT...LOC 0045Z 283DEG 55KT 4262 8940 4230 8952 4206 9004 

$$

ILC015-177-200100-
/O.CON.KDVN.SV.W.0154.000000T0000Z-170720T0100Z/
Carroll IL-Stephenson IL-
746 PM CDT WED JUL 19 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR CARROLL AND STEPHENSON COUNTIES...

At 745 PM CDT, severe thunderstorms were located along a line
extending from Brodhead to near Ridott to near Mount Carroll, moving
east at 65 mph.

HAZARD...70 mph wind gusts. 

SOURCE...Trained weather spotters near Orangeville and Freeport. 

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings. 

Locations impacted include...
Freeport, Mount Carroll, Savanna, Lena, Lanark, Milledgeville, Pearl
City, Shannon, Cedarville, Davis, Sabula, Chadwick, Dakota, German
Valley, Rock City, Ridott, Argo Fay, Buena Vista, Loran and Rock
Grove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across Stephenson County. SEEK SHELTER NOW inside a 
sturdy structure and stay away from windows.
 
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4220 8940 4220 8969 4193 8969 4201 9014
      4204 9017 4211 9016 4218 9000 4220 8999
      4220 8992 4231 8992 4250 8966 4250 8940
TIME...MOT...LOC 0045Z 283DEG 55KT 4262 8940 4230 8952 4206 9004 

HAIL...<.75IN
WIND...70MPH
 
$$

ERVIN

438 
WWUS53 KDVN 200059
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
759 PM CDT WED JUL 19 2017

ILC015-177-200108-
/O.EXP.KDVN.SV.W.0154.000000T0000Z-170720T0100Z/
Carroll IL-Stephenson IL-
759 PM CDT WED JUL 19 2017

...THE SEVERE THUNDERSTORM WARNING FOR CARROLL AND STEPHENSON
COUNTIES WILL EXPIRE AT 800 PM CDT...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning will be allowed to expire.
However gusty winds and heavy rain are still possible with these 
thunderstorms through 9 PM.  The severe wind threat was at the front 
of the storm, and this is now east of Stephenson County.

A severe thunderstorm watch remains in effect until midnight CDT for
northwestern Illinois...and east central Iowa.

LAT...LON 4220 8940 4220 8969 4193 8969 4201 9014
      4204 9017 4211 9016 4218 9000 4220 8999
      4220 8992 4231 8992 4250 8966 4250 8940
TIME...MOT...LOC 0058Z 301DEG 50KT 4251 8924 4219 8937 4200 8966 

$$

ERVIN

Area Forecast Discussion...UPDATED
National Weather Service Quad Cities IA IL
641 PM CDT Wed Jul 19 2017

...AVIATION UPDATE...

.SYNOPSIS...
Issued at 300 PM CDT Wed Jul 19 2017

This afternoon temperatures ranged across the area from the upper
80s to the mid 90s.  This resulted in heat indices ranging from near
100 to 110 across the area.  A warm front extended across the area
and aided in pooling low level moisture across the area.  To the NNW
a thunderstorm complex was slowly moving east southeast.  This
complex is expected to be the main forecast concern in the short
term.

&&

.SHORT TERM...(This Evening through Thursday)
ISSUED AT 300 PM CDT Wed Jul 19 2017

Next 12 to 18 hours are forecast to be active with a couple rounds
of thunderstorms, some of which could be severe.

Main forecast concern in the short term are the chances for
thunderstorms this afternoon and overnight across the area.  The
northern CWA is under an enhanced risk for severe weather.  The
ongoing thunderstorm complex has accelerated with time and is
currently rooted in the boundary layer.  The overall gradient in
CAPE and cap suggests that these storms will eventually turn south
and into our area late this afternoon.  WPC QPF depicts this quite
well.  The CAMs have been slow to catch onto this trend, but appears
to be trending that way as well.  As these storms approach the area,
an upper level vort max is expected to accompany this storm.  This
wave will increase deep layer shear and set the stage for severe
weather.  Damaging winds and heavy rain will be the main threat for
the area.  Low level shear is expected to increase tonight and could
lend itself to a tornado threat across the area.

Another wave is expected to initiate thunderstorms across the Dakotas
this afternoon and evening.  As these storms grow upscale they are
expected to track ese as well.  These storms could affect the area
near sunrise and could pose a severe wind, heavy rain and tornado
threat.

Thursday, the warm front is expected to remain across the area.
Showers and storms could be ongoing at the beginning of the day. Any
cloud cover from these storms could affect temperatures across the
area tomorrow.  This could also affect overall heat index values
tomorrow.  Regardless, it will be hot and humid across the area.
With the warm front across the area there is a chance for afternoon
thunderstorms. At this time, it appears that the limiting factor to
any thunderstorms would be a midlevel capping inversion in place.

.LONG TERM...(Thursday Night through Wednesday)
ISSUED AT 300 PM CDT Wed Jul 19 2017

Thursday Night through Saturday

Heat Headlines:

Expanded Excessive Heat Warning and Heat Advisory further north
approximately a tier of counties. Current sfc dewpoints are in
the lower to middle 70s across E Iowa/NW Illinois and could
occasionally reach the upper 70s through this week, which will
push afternoon heat indices over 100 F.

The Excessive Heat Warning now also includes Iowa City and the
Quad Cities Metro to name a few of the most populated areas. For
counties in the warning, we are either anticipating 4-5
days of peak heat indices of +100 F, or 2-3 consecutive days of
near or over 105 F. It's the long duration that increases the
susceptibility to heat related illnesses for people working or
spending time outside, or without access to air conditioning. The
cumulative effects of the heat begin to wear on the body.

The northern tier of the Heat Advisory (not including Bureau or
Putnam Counties) is set to expire Friday evening due to lower
confidence on upper 90s or near 100 F heat indices on Saturday as
a front begins working southward through E Iowa/NW Illinois. If
the forecast or conditions change, the advisory could simply be
extended.

Thunderstorm Chances:

No significant changes to the extended forecast regarding threat
for storms. E Iowa/NW Illinois is situated along the edge of the
capping inversion aloft that inhibits convective development, and
near the favorable 850mb baroclinic zone of upper teens to lower
20s (Celsius) for occasional rounds of mesoscale convective
systems. We continue to forecast a tight NE to SW PoP gradient
from 40-60% across the far N/NE to only 20% over the
south/southwest. However, the final track of these storm clusters
will depend on where convection forms on previous days, because
they will layout a low-level convergent boundary in their wake. It
is too early to know exactly where the sfc boundary will be
located from Thursday night through Saturday. As mentioned, the
best chances for storms are north of I-80, probably Friday and
Friday night.

High instability with +4000 J/kg MUCAPE and deep layer shear over
35 kts are supportive of a damaging wind threat, especially from
organized bowing structures - if they form. Additionally, high
PWATs near 2.00-2.25 inches translates to torrential rainfall
potential with 2-3 inches/hr possible and a risk for flash
flooding within the heaviest cores. Uttech

Sunday through Wednesday

ECMWF/GFS still similar in bringing a cold front across the CWA
on Saturday night and Sunday, accompanied by a slight chance for
showers or thunderstorms along and south of I-80. In the wake of
the front, much cooler temperatures and much less humidity will be
a welcomed relief early next week. The consensus model has highs
in the upper 70s far north to mid 80s south with lows in the mid
50s to lower 60s. Haase

&&

.AVIATION...(For the 00Z TAFS through 00Z Thursday Evening)
ISSUED AT 632 PM CDT Wed Jul 19 2017

High impact thunderstorm event ongoing for DBQ airport may evolve
south into CID and MLI later this evening as winds in excess of 50
kts. These storms will affect the area through the evening. There
is another chance for storms late tonight, however confidence is
low, so will leave those out of the TAFs. Otherwise expect VFR
conditions and winds to shift to southwest to west later in the
period.

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...Heat Advisory until 8 PM CDT Friday for Benton-Clinton-Jones-
     Linn.

     Excessive Heat Warning until 8 PM CDT Saturday for Cedar-Des
     Moines-Henry IA-Iowa-Jefferson-Johnson-Keokuk-Lee-Louisa-
     Muscatine-Scott-Van Buren-Washington.

IL...Heat Advisory until 8 PM CDT Friday for Whiteside.

     Excessive Heat Warning until 8 PM CDT Saturday for Hancock-
     Henderson-Henry IL-McDonough-Mercer-Rock Island-Warren.

     Heat Advisory until 8 PM CDT Saturday for Bureau-Putnam.

MO...Excessive Heat Warning until 8 PM CDT Saturday for Clark-
     Scotland.

&&

SYNOPSIS...Gibbs
SHORT TERM...Gibbs
LONG TERM...Uttech/Haase
AVIATION...Gibbs

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
113 PM CDT Wed Jul 19 2017

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-201815-
Buchanan-Delaware-Dubuque-Benton-Linn-Jones-Jackson-Iowa-Johnson-
Cedar-Clinton-Muscatine-Scott-Keokuk-Washington-Louisa-Jefferson-
Henry IA-Des Moines-Van Buren-Lee-Jo Daviess-Stephenson-Carroll-
Whiteside-Rock Island-Henry IL-Bureau-Putnam-Mercer-Henderson-
Warren-Hancock-McDonough-Scotland-Clark-
113 PM CDT Wed Jul 19 2017

This Hazardous Weather Outlook is for portions of north central
Illinois...northwest Illinois...west central Illinois...east
central Iowa...northeast Iowa...southeast Iowa and northeast
Missouri.

.DAY ONE...THIS AFTERNOON AND TONIGHT

Hot and humid conditions are expected to continue with heat index
readings as high as 100 to 105. Heat advisories and heat warnings
are in effect for portions of the outlook area beginning this
afternoon.

Thunderstorms are forecast late this afternoon and overnight. Two
rounds are forecast. One for later this afternoon into the evening
and then again late tonight. Some of these storms could become
severe with damaging winds and heavy rains being the main threat.
There is also a low chance for tornadoes, however confidence is
low that this will occur.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Thursday through Saturday...several rounds of thunderstorm complexes
will push across portions of the outlook area, mainly along and
north of Interstate 80. There is the potential for these storms to
be severe with damaging winds and large hail. Torrential rainfall is
likely with several inches of rain possible in a short time. This
could lead to localized flash flooding. However, confidence is low
on the timing and exact location of the thunderstorm complexes.

Hot and humid conditions can be expected through Saturday. The
hotter temperatures should generally occur near and south of
Interstate 80. Temperatures are expected to push well into the 90s
with dewpoints well into the 70s to around 80. This will soar heat
index values to 100 to 106 almost every afternoon through Saturday.
But cloud cover and storm outflow may bring temporary cool downs to
the ambient temperatures, especially north of Interstate 80.

An Excessive Heat Warning is in effect through Saturday for areas
generally near and south of a line from Sigourney Iowa, to Wapello
and Aledo Illinois. A Heat Advisory is in effect through Saturday
generally for the counties along the Interstate 80 corridor.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed late this afternoon and overnight
across east central Iowa and northwest Illinois.

Special Weather Statement
National Weather Service Quad Cities IA IL
209 PM CDT Wed Jul 19 2017

IAZ040>042-054-ILZ001-007-200000-
Buchanan-Delaware-Dubuque-Jackson-Jo Daviess-Carroll-
Including the cities of Independence, Manchester, Dubuque,
Maquoketa, Galena, and Mount Carroll
209 PM CDT Wed Jul 19 2017

...Very Humid into this Evening...

High temperatures in the upper 80s combined with dewpoints in the
middle 70s will lead to peak heat indices between 95 and 100
degrees into the early evening hours.

If spending time outside today, be sure to drink plenty of water
and take breaks in the shade. Also, never leave a child or pet
unattended in a vehicle.

Uttech