Hail and Damaging Winds in Iowa, June 11, 2022

Area Forecast Discussion
National Weather Service Quad Cities IA IL
646 PM CDT Sat Jun 11 2022

...AVIATION UPDATE...

.SYNOPSIS...
Issued at 243 PM CDT Sat Jun 11 2022

18z data has a warm front running from central Nebraska into
southern Illinois. South of the warm front dew points were in the
upper 60s and 70s while north of the warm front dew points were in
the low to mid 60s.

&&

.SHORT TERM...(This Evening through Sunday)
ISSUED AT 243 PM CDT Sat Jun 11 2022

Upper level disturbance moving through the area is generating
isolated to scattered showers with perhaps a few rumbles of thunder.
This scenario is expected to continue through sunset followed by a
decrease in areal coverage.

Late tonight and into Sunday morning isolated showers and possibly a
thunderstorm may occur as the warm front slowly moves north. Patchy
to areas of fog are possible mainly north of highway 30. Right now
it 'appears' that the fog should be limited in scope. However if the
fog becomes more extensive then headlines may be needed.

The warm front will push through the area late Sunday morning and
early afternoon. Once the warm front passes, temperatures and
humidity levels will be on the increase.

.LONG TERM...(Sunday Night through Saturday)
ISSUED AT 243 PM CDT Sat Jun 11 2022

[Key Messages]

1) Dangerous heat and humidity early next week

2) Strong storms possible Monday

3) Brief relief from heat with cold front by late next week, along
with more showers/storms

[Discussion]

Sunday Night through Tuesday Night...

Main story of this period continues to be the well-advertised heat
wave across the area, with daily heat indices well over 100 degrees
expected for most Monday through Wednesday.

Frontal boundary over the area this weekend will surge north ahead
of strong ridging and renewed southwesterly flow into the Midwest
beginning Monday. Pronounced high over the southeastern U.S. will
usher in an anomalously hot air mass into the area, with 925-850 hPa
temperatures climbing near to just above 30 degrees Celcius! This
remains well above the max percentile in the NAEFS guidance, and high
above the DVN sounding climatology max temperature for these height
ranges. In english, it's going to get hot!

Daily highs Monday through Wednesday are forecast to exceed 90 for
much of the CWA, with some sites touching or barely exceeding 100
Tuesday (highest temperatures in the 925-850 hPa range will be
overhead). Combine this with dewpoints in the upper 60s to low 70s,
and you have a recipe for heat indices climbing to around 105
(potentially higher in urban areas). Heat headlines are expected for
this period soon, so stay tuned for further information as more
refinements are made to precip chances and cloud cover.

Beginning to grow increasingly concerned for severe weather
potential for Monday as models prog an overnight MCS to track along
and north of the warm front and pooling dewpoints. This complex
could become severe as it rides the instability gradient along the
front, and interacts with a fairly potent LLJ and 500 hPa vort max
aloft. Minus the 12z NAMnest, much of the deterministic guidance
paints this complex to pass the area just to the north, but it is
important to note that the position of this will vary ultimately on
the warm front placement which is not in full agreement. Currently,
the Storm Prediction Center has areas along and north of Highway 20
in a Level 1 (marginal) risk for severe thunderstorms, but this is
likely to change as the warm front position becomes more clear.

Wednesday on...

We are likely to get some, but ultimately not much relief from the
heat as a weak cold front is progged to slowly pass through the area
Wednesday into Thursday. Showers and thunderstorm chances are in
good agreement in ensembles and deterministic guidance as lift from
the front and the approaching trough from the west interact with the
instability and moisture overhead. While it is too early to evaluate
the potential severe threat, storms are likely to produce torrential
rain with PWATs pooling near two inches ahead of the front.

High pressure will follow for the weekend, but the warmth is
expected to stick around with temperatures holding in the upper 80s
to low 90s. Thankfully, humidity looks to be lower with
northwesterly flow ushering in drier air.

&&

.AVIATION...(For the 00Z TAFS through 00Z Sunday Evening)
ISSUED AT 636 PM CDT Sat Jun 11 2022

Light rain and even some thunder have a low chance of affecting
the TAF sites through the next 6 hours. Mainly VFR with some MVFR
cigs are expected until later in the overnight when some IFR could
build into the area. This is expected to occur around daybreak
across the area. Later in the period expect clouds to rise and
burn off leading to VFR conditions with light winds.

&&

.CLIMATE...
ISSUED AT 232 AM CDT Sat Jun 11 2022

The Week 2 Hazards Outlook issued yesterday by the Climate
Prediction Center indicates a risk of another round of extreme
heat starting next weekend and continuing into next week. The
amplitude of the ridge in this time frame looks even more
impressive than the upcoming event. Whether that would translate
into higher temps remains to be seen.

Record Warm Lows for June 14...

Moline.........77 in 1981
Dubuque........75 in 1943

Record Highs for June 14...

Moline.........101 in 1987
Cedar Rapids...98 in 1897
Dubuque........96 in 1894
Burlington.....101 in 1987

Record Warm Lows for June 15...

Moline.........76 in 1994
Dubuque........73 in 1994

Record Highs for June 15...

Moline.........94 in 1894
Cedar Rapids...99 in 1896
Dubuque........95 in 1894
Burlington.....97 in 1944

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...NONE.
IL...NONE.
MO...NONE.
&&

SYNOPSIS...08
SHORT TERM...08
LONG TERM...Speck
AVIATION...Gibbs
CLIMATE...Wolf

Hazardous Weather Outlook
National Weather Service Quad Cities IA IL
335 AM CDT Sat Jun 11 2022

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-120845-
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-
335 AM CDT Sat Jun 11 2022

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

Patchy dense fog early this morning will reduce visibilities to
one-quarter mile or less at times posing a travel hazard. The fog
should clear before mid-morning.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

Temperatures early this week, Monday through Wednesday, will
likely reach the highest readings we have seen so far this season,
and perhaps higher than we have experienced for several years.

The current forecast for the Quad Cities on Tuesday is 100
degrees, and upper 90s will be widespread across the area each day.
Multiple days of extreme heat will especially prove stressful
with nighttime temperatures remaining well in the 70s.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

wolf

Special Weather Statement
National Weather Service Quad Cities IA/IL
859 PM CDT Sat Jun 11 2022

IAZ040-120300-
Buchanan IA-
859 PM CDT Sat Jun 11 2022

...Heavy rain from thunderstorms will impact portions of Buchanan
County through 1000 PM CDT...

At 855 PM CDT, Doppler radar was tracking heavy rain producing
thunderstorms along a line extending from 6 miles southwest of
Fairbank to Troy Mills. These storms were nearly stationary.  Up to
one inch of rain has fallen and another inch is possible

HAZARD...Minor flooding of area roads, low-lying areas and small
         creeks.

SOURCE...Radar indicated.

IMPACT...Ponding of water on area roads, sidewalks, and the
         potential for hydroplaning.

Locations impacted include...
Independence, Jesup, Fairbank, Winthrop, Quasqueton, Rowley,
Wapsipinicon Golf Course, Fontana County Park, Littleton, Monti,
Buchanan County Fairgrounds, Otterville, Independence Airport and
Fontana Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4241 9160 4230 9160 4230 9183 4241 9207
      4247 9206 4247 9208 4264 9208 4264 9197
TIME...MOT...LOC 0155Z 250DEG 1KT 4257 9212 4229 9165

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...<30 MPH

Gibbs

Special Weather Statement
National Weather Service Quad Cities IA/IL
935 PM CDT Sat Jun 11 2022

IAZ040-051-120300-
Buchanan IA-Benton IA-
935 PM CDT Sat Jun 11 2022

...A strong thunderstorm will impact portions of southwestern
Buchanan and northeastern Benton Counties through 1000 PM CDT...

At 934 PM CDT, Doppler radar was tracking a strong thunderstorm near
Independence, moving southeast at 25 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

This strong thunderstorm will be near...
  Independence around 940 PM CDT.

Other locations in the path of this storm include Rowley and
Quasqueton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

This storm 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 4239 9173 4229 9186 4246 9207 4246 9206
      4252 9199
TIME...MOT...LOC 0234Z 308DEG 23KT 4245 9198

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Gibbs

Special Weather Statement
National Weather Service Quad Cities IA/IL
1014 PM CDT Sat Jun 11 2022

IAZ040-041-052-053-120415-
Linn IA-Buchanan IA-Delaware IA-Jones IA-
1014 PM CDT Sat Jun 11 2022

...Strong thunderstorms will impact portions of Buchanan,
northwestern Cedar, southwestern Jones, southwestern Delaware and
northeastern Linn Counties through 1115 PM CDT...

At 1014 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Fairbank to Olin. Movement was northeast
at 5 mph.

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Strong thunderstorms will be near...
  Olin and Morley around 1020 PM CDT.

Other locations in the path of these storms include Wyoming, Oxford
Junction, Stanley and Center Junction.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms 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.

Persons in campgrounds should consider seeking sturdy shelter until
these storms pass.

&&

LAT...LON 4264 9176 4201 9092 4194 9104 4195 9136
      4252 9208 4264 9208
TIME...MOT...LOC 0314Z 238DEG 4KT 4264 9200 4200 9112

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

Gibbs

Special Weather Statement
National Weather Service Quad Cities IA/IL
1147 PM CDT Sat Jun 11 2022

IAZ065>068-ILZ015-120530-
Rock Island IL-Scott IA-Clinton IA-Muscatine IA-Cedar IA-
1147 PM CDT Sat Jun 11 2022

...A strong thunderstorm will impact portions of central Rock Island,
east central Cedar, Scott, northeastern Muscatine and southwestern
Clinton Counties through 1230 AM CDT...

At 1146 PM CDT, Doppler radar was tracking a strong thunderstorm over
Wheatland, or 13 miles north of Durant, moving southeast at 30 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This strong thunderstorm will be near...
  Calamus around 1150 PM CDT.

Other locations in the path of this storm include Donahue, Walcott,
Long Grove, Davenport, Eldridge and Bettendorf.

This includes the following highways...
 Interstate 74 in Iowa near mile marker 1.
 Interstate 80 in Iowa between mile markers 281 and 299.
 Interstate 280 between mile markers 1 and 10.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

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

&&

LAT...LON 4177 9101 4190 9087 4167 9041 4146 9065
TIME...MOT...LOC 0446Z 310DEG 28KT 4179 9086

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Gunkel