Special Weather Statement, NWS Quad Cities, IA

Area Forecast Discussion
National Weather Service Quad Cities IA IL
303 PM CDT Tue Jun 4 2024

.KEY MESSAGES...

- There is a Marginal or level 1 out of 5 risk of severe storms
  this afternoon into tonight. The main threat will be isolated
  damaging wind gusts and lightning.

- A moist air mass is in place across the area resulting in the
  potential for heavy rainfall. This results in a localized
  flash flooding concern into tonight, especially in urban
  areas.

- A pattern change toward the end of the week will result in
  below normal temperatures this weekend into early next week.

&&

.SHORT TERM /THROUGH WEDNESDAY/...
Issued at 249 PM CDT Tue Jun 4 2024

An MCV is evident on satellite and radar lifting into southeast Iowa
this afternoon. There is 1000 to 2000 J/KG of surface based CAPE.
Deep layer shear across the area is 15 to 20 knots. It also showing
precipitable water around 1.50 inches. Temperatures have warmed
into the upper 70s to lower 80s. Dewpoints are in the mid to
upper 60s.

In the near term, the MCV is forecast to lift northeastward to near
the Interstate 80 corridor through 7 PM this evening. There is an
area of surface vorticity and convergence located from Jasper County
southeastward into Jefferson and Van Buren County. CAMs show
scattered showers and storms developing and lifting northward
into the early evening. 0 to 6 km shear is borderline at 15 to
20 knots. Think that a wet microburst is possible given deep
moisture sounding profiles across the area and weak flow.
Precipitable water is 1.4 to 1.8 inches leading to heavy
rainfall and potential for localized flash flooding.

A second round of showers and storms are forecast to develop ahead
of a cold front that will move across the area later tonight.
Instability will diminish as these storms move into the area
and expect this line of showers and storms to be decaying as it
moves across the area between 3 and 12 UTC. Any severe threat
will be limited.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/...
Issued at 249 PM CDT Tue Jun 4 2024

Wednesday night Assessment...Medium confidence

Early Wednesday morning there may or may not be some lingering
showers in the far east and northeast areas. Any rain present will
exit the area by mid-morning leaving the remainder of the morning
dry.

A secondary cold front and an attendant upper level disturbance will
move through the area during the late afternoon and evening hours.
Forcing from the front and upper level disturbance should be enough
to generate isolated showers and possibly a few thunderstorms.
Overall coverage will be low at 20-25 percent. Most locations will
only see an increase in clouds along with a wind shift during the
frontal passage.

Thursday through Friday night
Assessment...high confidence of dry conditions

Northwest flow aloft will be well established by late week with high
pressure moving through the Midwest. Temperatures should be slightly
below normal.

Saturday
Assessment...low to medium confidence for rain chances

All models show a weak upper level disturbance moving through in the
flow aloft. The question, given northwest flow, is will there be
enough moisture present to produce any precipitation. Most
deterministic model runs indicate dry conditions. However, there are
some ensemble members from the respective models that do generate
some light precipitation.

The model consensus of the deterministic and ensembles generates low
coverage pops (20 percent) during the day Saturday. Thus the
overall message is that most of the area will remain dry on Saturday.

There is much higher confidence that temperatures will be slightly
below normal.

Saturday night through Monday
Assessment...medium to high confidence

The model consensus has dry conditions for the area along with
temperatures slightly below normal.

There will be weak disturbances in the flow aloft moving through the
area. If there is sufficient moisture available, one cannot fully
rule out some rogue diurnal showers occurring. If this scenario does
occur, coverage would be low (20 percent at best).

&&

.AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/...
Issued at 1247 PM CDT Tue Jun 4 2024

A disturbance is forecast to lift across eastern Iowa TAF sites
this afternoon prior to 00 UTC with scattered showers and
isolated storms. The confidence is low on coverage so used VCSH
at all TAF sites for mainly the 20 to 24 UTC timeframe. A
second disturbance and cold front will move across the area
tonight with a line of weakening showers and thunderstorms
moving across the area. MVFR visibilities are possible in the
strongest showers and storms tonight. Winds behind the cold
front will switch to the west. Showers will end by 12 UTC with
skies clearing and VFR conditions prevailing.

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...None.
IL...None.
MO...None.

&&

SHORT TERM...Cousins
LONG TERM...08
AVIATION...Cousins

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
338 AM CDT Tue Jun 4 2024

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-050845-
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-
338 AM CDT Tue Jun 4 2024

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...TODAY AND TONIGHT

The Storm Prediction Center has a marginal risk, or level 1 out of
5 risk, across the entire area.

Scattered thunderstorms are expected from late morning through
tonight. Some storms may be severe this afternoon and evening,
with damaging winds being the primary risk and hail as a secondary
risk. Locally heavy rainfall could pose a risk for isolated flash
flooding this afternoon and tonight, especially in urban areas.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

GENERAL STORM MOTION OF THE DAY:

To the north at 25 mph through sunset. Tonight to the east at 30
mph.

Special Weather Statement
National Weather Service Quad Cities IA/IL
436 PM CDT Tue Jun 4 2024

IAZ053-054-065-042230-
Jackson IA-Cedar IA-Jones IA-
436 PM CDT Tue Jun 4 2024

...Strong thunderstorms will impact portions of Jackson, northern
Cedar and Jones Counties through 530 PM CDT...

At 435 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Charlotte to near Stanwood. Movement was
north at 20 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Strong winds could break small tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Maquoketa, Anamosa, Monticello, Bellevue, Preston, Olin, Wyoming,
Oxford Junction, Miles, Andrew, Martelle, Onslow, Monmouth,
Springbrook, Morley, Center Junction, Spragueville, Fulton,
Hurstville, and Stone City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is occurring and may lead to localized flooding.
Do not drive your vehicle through flooded roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4229 9043 4203 9029 4203 9090 4193 9090
      4194 9137 4229 9136
TIME...MOT...LOC 2135Z 185DEG 17KT 4193 9037 4194 9116

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

Friedlein

Special Weather Statement
National Weather Service Quad Cities IA/IL
440 PM CDT Tue Jun 4 2024

ILZ016>018-042230-
Bureau IL-Henry IL-Putnam IL-
440 PM CDT Tue Jun 4 2024

...Strong thunderstorms will impact portions of Bureau, northeastern
Henry and Putnam Counties through 530 PM CDT...

At 440 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Geneseo to near Toluca. Movement was north
at 35 mph.

HAZARD...Wind gusts of 50 to 55 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Strong winds could break tree limbs, knock down weak trees
         and blow around unsecured objects. Minor damage to outdoor
         objects is possible.

Locations impacted include...
Kewanee, Princeton, Hennepin, Geneseo, Spring Valley, DePue,
Granville, Walnut, Ladd, Wyanet, Atkinson, Sheffield, Annawan,
Tiskilwa, Dalzell, Buda, Bureau Junction, McNabb, Hooppole, and
Putnam.

This includes the following highways...
 Interstate 80 in Illinois between mile markers 20 and 72.
 Interstate 180 between mile markers 1 and 13.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is occurring and may lead to localized flooding.
Do not drive your vehicle through flooded roadways.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

If the heavy rain continues, a flash flood warning may be needed.

&&

LAT...LON 4110 8936 4112 8934 4115 8933 4115 8964
      4123 8964 4123 8987 4122 8987 4138 9020
      4158 9001 4159 8946 4144 8917 4111 8916
TIME...MOT...LOC 2140Z 193DEG 29KT 4141 9010 4093 8913

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH

Gibbs

Preliminary Local Storm Report
National Weather Service Quad Cities IA IL
442 PM CDT Tue Jun 4 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0406 PM     Tstm Wnd Gst     2 SSE Davenport Municip 41.60N 90.57W
06/04/2024  E60 MPH          Scott              IA   Broadcast Media

&&

GROSS

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Special Weather Statement
National Weather Service Quad Cities IA/IL
521 PM CDT Tue Jun 4 2024

IAZ054-066-ILZ001-007-009-015-042300-
Whiteside IL-Carroll IL-Rock Island IL-Jo Daviess IL-Clinton IA-
Jackson IA-
521 PM CDT Tue Jun 4 2024

...Strong thunderstorms will impact portions of Whiteside, Carroll,
northeastern Rock Island, south central Jo Daviess, central Clinton
and eastern Jackson Counties through 600 PM CDT...

At 521 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Delmar to near Prophetstown. Movement was
northeast at 25 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Strong winds could break small tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Clinton, Maquoketa, Morrison, Mount Carroll, Camanche, Fulton,
Savanna, Bellevue, Prophetstown, Erie, Garden Plain, Milledgeville,
Preston, Fairhaven, Albany, Hanover, Lyndon, Sabula, Chadwick, and
Delmar.

This includes Interstate 88 between mile markers 16 and 36.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is occurring and may lead to localized flooding.
Do not drive your vehicle through flooded roadways.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4202 8969 4193 8969 4193 8963 4188 8963
      4159 8997 4171 9024 4178 9025 4175 9031
      4196 9078 4237 9050
TIME...MOT...LOC 2221Z 212DEG 22KT 4199 9066 4170 9000

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

Gibbs