Special Weather Statement, NWS Quad Cities, IA

Area Forecast Discussion
National Weather Service Quad Cities IA IL
628 AM CDT Thu Jul 29 2021

...AVIATION UPDATE...

.SYNOPSIS...
Issued at 352 AM CDT Thu Jul 29 2021

Thunderstorms with damaging winds were moving through the highway 20
corridor early this morning. Otherwise the warm and muggy conditions
continued. Temperatures were in the mid 70s to lower 80s. Dew points
were mainly in the mid and upper 70s.

&&

.SHORT TERM...(Today and Tonight)
ISSUED AT 352 AM CDT Thu Jul 29 2021

1) Heat and humidity continues roughly along and south of I-80

2) Slight Risk for severe storms this afternoon into the evening
south of Highway 34.

Today, the morning activity is expected to move southeast and
diminish around daybreak. A cold front will drop south through
the area this morning with redevelopment of showers and storms
across the south CWA this afternoon along the front. SPC has a
Slight Risk of severe storms with damaging wind gusts and large
hail the main threat. Areas most at risk are the southern tier of
counties from 2 pm to 7 or 8 pm when the activity should move
south out of the area. Temperatures will be in the upper 80s and
lower 90s with a few mid 90 readings in the SW CWA. Relief from
the heat will work southward through the area as the front moves
southward with dew points slowly dropping into the 60s to near 70
and winds increasing out of the north. The Heat Advisory will
remain in effect for the southern half of the CWA with heat
indices in the 100 to 105 degree range with locally higher
readings at times. Tonight, quiet and less humid conditions will
be found with lows in the lower 60s in NW IL and lower 70s in NE
MO.

.LONG TERM...(Friday through Wednesday)
ISSUED AT 352 AM CDT Thu Jul 29 2021

Key Messages:

1) Mid 70s to lower 80s return Friday through Thursday

2) Showers and storms likely mainly Friday night and Saturday
morning in the SW half of the CWA

3) Dry conditions Sunday through Thursday

Friday into Saturday, a disturbance in NW flow will bring showers
and storms to the SW half or so of the CWA mainly Friday evening
through Saturday morning. After lows in the mid 50s to mid 60s from
NE to SW early Saturday, with the rain, temperatures will struggle
into the low to mid 70s in west central IL, with upper 70s and low
80s elsewhere.

Sunday through Thursday, high pressure will be slowly moving across
the area with dry conditions and temperatures back in the upper 70s
to low 80s for highs and pleasantly cool mid 50s to lower 60s for
lows. Open the windows!

&&

.AVIATION...(For the 12Z TAFS through 12Z Friday Morning)
ISSUED AT 620 AM CDT Thu Jul 29 2021

Storms will continue to impact KMLI through about 13z this
morning. Otherwise, expect a boundary to drop south through the
area today, bring a shift to a northerly wind. Mainly VFR
conditions will continue. One possible exception is potential for
development of storm near KBRL this afternoon. This will depend on
how far south the boundary pushes through the day. With a high
level of uncertainty, have not included in the 12Z TAF.

&&

.DVN WATCHES/WARNINGS/ADVISORIES...
IA...Heat Advisory until 8 PM CDT this evening for Cedar-Des Moines-
     Henry IA-Iowa-Jefferson-Johnson-Keokuk-Lee-Louisa-Muscatine-
     Scott-Van Buren-Washington.

IL...Heat Advisory until 8 PM CDT this evening for Hancock-Henderson-
     Henry IL-McDonough-Mercer-Rock Island-Warren.

MO...Heat Advisory until 8 PM CDT this evening for Clark-Scotland.

&&

SYNOPSIS...14
SHORT TERM...14
LONG TERM...14
AVIATION...RP Kinney

Hazardous Weather Outlook...CORRECTED
National Weather Service Quad Cities IA IL
453 AM CDT Thu Jul 29 2021

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-301000-
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-
453 AM CDT Thu Jul 29 2021

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

Thunderstorms early this morning across east central Iowa and
northwest Illinois may produce wind gusts to 40 MPH, small hail,
and heavy rainfall.

Hot and humid conditions will continue through 8 PM this evening
across areas along and south of I-80 where heat indices in the 100
to 105 range are expected. A Heat Advisory remains in effect.

There is a chance for thunderstorms this afternoon and early
evening south of Highway 34 from Ottumwa to Galesburg. The Storm
Prediction Center has a Slight Risk for this area; with damaging
wind gusts and large hail being the main threat.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

There is a chance for showers and thunderstorms Friday into
Saturday. Severe storms are not anticipated.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed south of Highway 34 this
afternoon and evening.

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Special Weather Statement
National Weather Service Quad Cities IA/IL
923 AM CDT Thu Jul 29 2021

ILC131-187-291515-
Warren-Mercer-
923 AM CDT Thu Jul 29 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN WARREN AND MERCER
COUNTIES UNTIL 1015 AM CDT...

At 922 AM CDT, a strong thunderstorm was located over Joy, or near
Aledo, moving southeast at 40 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Aledo, Burgess, Viola, Millersburg, New Boston, Keithsburg, Joy,
Seaton, Shale City, Mannon, Ogle, Alexis, Gerlaw, Aledo Mercer County
Airport, Wanlock, Gingle Corners, Gilchrist, Sunbeam, Old Gilchrist
and Mercer County Fairgrounds.

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 4104 9079 4107 9079 4107 9084 4114 9098
      4116 9100 4117 9102 4133 9089 4133 9085
      4119 9044 4116 9044 4095 9061
TIME...MOT...LOC 1422Z 303DEG 33KT 4120 9083

Gunkel

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Special Weather Statement
National Weather Service Quad Cities IA/IL
955 AM CDT Thu Jul 29 2021

IAC057-087-115-183-291530-
Henry-Des Moines-Louisa-Washington-
955 AM CDT Thu Jul 29 2021

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN HENRY...
NORTHWESTERN DES MOINES...SOUTHERN LOUISA AND SOUTHEASTERN WASHINGTON
COUNTIES UNTIL 1030 AM CDT...

At 955 AM CDT, a strong thunderstorm was located over Wyman, or 7
miles southwest of Columbus Junction, moving southeast at 40 mph.

Winds in excess of 30 mph and half inch hail are possible with this
storm.

Locations impacted include...
Wapello, Columbus Junction, Winfield, Wayland, Morning Sun,
Ainsworth, Columbus City, Crawfordsville, Olds, Mount Union, Cotter,
Wyman, Noble, Marr Park, Pleasant Grove, Cairo, Virginia Grove
Recreation Area, Swedesburg, Marsh and Garland.

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 4117 9171 4134 9158 4117 9106 4094 9127
TIME...MOT...LOC 1455Z 299DEG 34KT 4120 9147

Gunkel

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