Alton, Illinois Weather Conditions

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Excessive Heat Warning View All Alerts

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Current Conditions

  • 72°
  • Scattered Clouds
  • Wind: North 6 mph
  • Humidity: 89%
  • Visibility: 10.0 miles
  • Dew Point: 69°
  • Pressure: 29.97 in. -

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Next 12 Hours

11  pm
2  am
5  am
8  am
11  am
Thunderstorm
T-storms
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
77°
76°
75°
78°
86°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Tuesday
  • Chance of a Thunderstorm
  • High: 95 °
  • Low: 76 °
  • Chance of T-Storms
  • Wednesday
  • Partly Cloudy
  • High: 88 °
  • Low: 63 °
  • Partly Cloudy
  • Thursday
  • Clear
  • High: 86 °
  • Low: 64 °
  • Clear
  • Friday
  • Clear
  • High: 88 °
  • Low: 65 °
  • Clear
  • Saturday
  • Clear
  • High: 88 °
  • Low: 66 °
  • Clear

Forecast for Alton, Illinois

Updated: 7:00 PM CDT on January 27, 2015

Excessive heat warning in effect until 9 PM CDT Tuesday...
  • Monday

    Showers and thunderstorms early. Lows overnight in the mid 70s.

  • Monday Night

    Scattered thunderstorms during the evening. Partly cloudy skies after midnight. Low 74F. Winds light and variable. Chance of rain 60%.

  • Tuesday

    Partly cloudy early. Scattered thunderstorms developing in the afternoon. High around 95F. Winds light and variable. Chance of rain 40%.

  • Tuesday Night

    Partly cloudy with late night showers or thunderstorms. Low 76F. Winds light and variable. Chance of rain 50%.

  • Wednesday

    Sunshine and clouds mixed. High 88F. Winds NW at 10 to 15 mph.

  • Wednesday Night

    A mostly clear sky. Low 63F. Winds NNW at 5 to 10 mph.

  • Thursday

    Sunny skies. High 86F. Winds N at 5 to 10 mph.

  • Thursday Night

    Clear. Low 64F. Winds light and variable.

  • Friday

    A mainly sunny sky. High 88F. Winds WNW at 5 to 10 mph.

  • Friday Night

    A mostly clear sky. Low near 65F. Winds light and variable.

  • Saturday

    A mainly sunny sky. High 88F. Winds WNW at 5 to 10 mph.

  • Saturday Night

    A mostly clear sky. Low 66F. Winds light and variable.

  • Sunday

    A mainly sunny sky. High 89F. Winds WSW at 5 to 10 mph.

  • Sunday Night

    Mainly clear early, then a few clouds later on. Low 66F. Winds light and variable.

  • Monday

    Sunny along with a few clouds. High 83F. Winds WNW at 5 to 10 mph.

  • Monday Night

    Partly cloudy skies. Low 67F. Winds light and variable.

  • Tuesday

    Partly cloudy. High around 85F. Winds SSE at 5 to 10 mph.

  • Tuesday Night

    Isolated thunderstorms during the evening, then cloudy skies overnight. Low 67F. Winds light and variable. Chance of rain 30%.

  • Wednesday

    Partly cloudy with afternoon showers or thunderstorms. High near 85F. Winds SW at 5 to 10 mph. Chance of rain 60%.

  • Wednesday Night

    Variable clouds with scattered thunderstorms. Low near 65F. Winds NE at 5 to 10 mph. Chance of rain 60%.

  • Thursday

    Variable clouds with scattered thunderstorms. High 83F. Winds WSW at 5 to 10 mph. Chance of rain 60%.

  • Thursday Night

    Partly cloudy in the evening. Increasing clouds with periods of showers after midnight. Low 63F. Winds E at 5 to 10 mph. Chance of rain 40%.

Severe Weather Alert Descriptions

 Excessive Heat Warning  Statement as of 3:40 PM CDT on July 27, 2015


... Excessive heat warning in effect until 9 PM CDT Tuesday...

The National Weather Service in St Louis has issued an excessive
heat warning... which is in effect until 9 PM CDT Tuesday. The
heat advisory is no longer in effect.

* Timing... dangerous heat index values will be reached during the
afternoon and early evening hours through Tuesday.

* Heat index values... heat index values will be around 110 degrees
due to high temperatures in the mid 90s... and dewpoints in the
mid to upper 70s.

* Impacts... the combination of hot temperatures and high
humidity will likely lead to an increased risk of heat-
related stress and illness. The very Young... the elderly...
those without air conditioning... and those participating in
strenuous outdoor activities will be the most susceptible.
Also... car interiors can reach lethal temperatures in a matter
of minutes.

Precautionary/preparedness actions...

Take extra precautions if you work or spend time outside. When
possible... reschedule strenuous activities to the early morning
or evening. Know the signs and symptoms of heat exhaustion and
heat stroke. Wear light weight and loose fitting clothing when
possible and drink plenty of water.

To reduce risk during outdoor work... the occupational safety and
health administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by
heat should be moved to a cool and shaded location. Heat stroke
is an emergency. Call 9-1-1 immediately.

People in the St. Louis metropolitan area can get information
about cooling centers or energy assistance related to the
excessive heat by calling the United way of greater St. Louis at
800-427-4626... or if calling from a land line phone dial 2-1-1.
You can also call cool down St. Louis at 314-241-7668.







Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Alton Amtrak, Alton, IL

Updated: 10:20 PM CDT

Temperature: 73.8 °F Dew Point: 72 °F Humidity: 93% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.01 in Heat Index: 71 °F Graphs

Location: Alton - Beacon, Alton, IL

Updated: 10:24 PM CDT

Temperature: 74.7 °F Dew Point: 71 °F Humidity: 89% Wind: SE at 2.9 mph Pressure: 29.90 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: Alton - Christian Hill Area, Alton, IL

Updated: 10:20 PM CDT

Temperature: 73.8 °F Dew Point: 70 °F Humidity: 89% Wind: Calm Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: 72 °F Graphs

Location: Milton Road, Alton, IL

Updated: 10:24 PM CDT

Temperature: 74.1 °F Dew Point: 70 °F Humidity: 87% Wind: East at 1.0 mph Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: 73 °F Graphs

Location: Alton - Rock Gate Estates, Alton, IL

Updated: 10:24 PM CDT

Temperature: 72.7 °F Dew Point: 71 °F Humidity: 94% Wind: Calm Pressure: 29.92 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Milton Area - Oscar, Alton, IL

Updated: 10:20 PM CDT

Temperature: 74.4 °F Dew Point: 70 °F Humidity: 87% Wind: NNE at 1.0 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: Chelsea Court, Godfrey, IL

Updated: 10:16 PM CDT

Temperature: 72.1 °F Dew Point: 68 °F Humidity: 88% Wind: Calm Pressure: 29.36 in Hourly Precipitation: 0.01 in Heat Index: 70 °F Graphs

Location: Brecht Ln, Godfrey, IL

Updated: 10:16 PM CDT

Temperature: 72.3 °F Dew Point: 72 °F Humidity: 99% Wind: Calm Pressure: 29.79 in Hourly Precipitation: - Heat Index: - Graphs

Location: Godfrey River Aire Subdivision, Godfrey, IL

Updated: 10:24 PM CDT

Temperature: 71.8 °F Dew Point: 70 °F Humidity: 94% Wind: Calm Pressure: 29.89 in Hourly Precipitation: 0.02 in Heat Index: - Graphs

Location: Wood River (West End), Wood River, IL

Updated: 10:13 PM CDT

Temperature: 75.9 °F Dew Point: 68 °F Humidity: 78% Wind: West at 1.1 mph Pressure: 29.62 in Hourly Precipitation: - Heat Index: 77 °F Graphs

Location: Rosewood Heights, East Alton, IL

Updated: 10:24 PM CDT

Temperature: 74.2 °F Dew Point: 69 °F Humidity: 84% Wind: Calm Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

Location: Wood River (East End), Wood River, IL

Updated: 10:21 PM CDT

Temperature: 75.7 °F Dew Point: 69 °F Humidity: 81% Wind: SSE at 1.1 mph Pressure: 29.95 in Hourly Precipitation: - Heat Index: 76 °F Graphs

Location: Whispering Oaks Drive, Bethalto, IL

Updated: 10:20 PM CDT

Temperature: 74.3 °F Dew Point: 69 °F Humidity: 82% Wind: North at - Pressure: 30.07 in Hourly Precipitation: - Heat Index: 74 °F Graphs

Location: Foster Township, Alton, IL

Updated: 10:21 PM CDT

Temperature: 72.0 °F Dew Point: 72 °F Humidity: 99% Wind: NE at 3.2 mph Pressure: 29.90 in Hourly Precipitation: - Heat Index: - Graphs

Location: The Landing at Old Jamestown, Florissant, MO

Updated: 10:24 PM CDT

Temperature: 76.5 °F Dew Point: 70 °F Humidity: 80% Wind: Calm Pressure: 29.84 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Jersey County along IL 111, Brighton, IL

Updated: 10:23 PM CDT

Temperature: 71.2 °F Dew Point: 68 °F Humidity: 88% Wind: Calm Pressure: 29.62 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Timber Ridge, Godfrey, IL

Updated: 10:20 PM CDT

Temperature: 71.9 °F Dew Point: 71 °F Humidity: 96% Wind: Calm Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Riverside at Albers Pointe, Florissant, MO

Updated: 10:24 PM CDT

Temperature: 72.3 °F Dew Point: 71 °F Humidity: 97% Wind: North at - Pressure: 29.95 in Hourly Precipitation: - Heat Index: - Graphs

Location: Alber Pointe Drive, Florissant, MO

Updated: 10:20 PM CDT

Temperature: 72.3 °F Dew Point: 71 °F Humidity: 97% Wind: North at - Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Fox Lake Meadows, Florissant, MO

Updated: 10:13 PM CDT

Temperature: 74.7 °F Dew Point: 71 °F Humidity: 88% Wind: ENE at 2.2 mph Pressure: 29.93 in Hourly Precipitation: - Heat Index: 74 °F Graphs

Location: Jost Farm, Florissant, MO

Updated: 10:20 PM CDT

Temperature: 75.0 °F Dew Point: 62 °F Humidity: 64% Wind: Calm Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Knight Compound, Dorsey, IL

Updated: 10:23 PM CDT

Temperature: 83.6 °F Dew Point: 81 °F Humidity: 93% Wind: Calm Pressure: 29.76 in Hourly Precipitation: 0.00 in Heat Index: 98 °F Graphs

Location: Southland Estates, Jerseyville, IL

Updated: 10:24 PM CDT

Temperature: 71.2 °F Dew Point: 70 °F Humidity: 96% Wind: Calm Pressure: 29.76 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Riverwood Place, Florissant, MO

Updated: 10:23 PM CDT

Temperature: 74.6 °F Dew Point: 72 °F Humidity: 92% Wind: Calm Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 73 °F Graphs

Location: 27th Street, Granite City, IL

Updated: 10:20 PM CDT

Temperature: 80.4 °F Dew Point: 73 °F Humidity: 77% Wind: North at - Pressure: 30.04 in Hourly Precipitation: 0.00 in Heat Index: 85 °F Graphs

Location: Steven Drive, Bunker Hill, IL

Updated: 10:20 PM CDT

Temperature: 73.4 °F Dew Point: 70 °F Humidity: 90% Wind: North at - Pressure: 29.23 in Hourly Precipitation: - Heat Index: 71 °F Graphs

Location: Nickel Plate Trail, Edwardsville, IL

Updated: 10:20 PM CDT

Temperature: 72.5 °F Dew Point: 72 °F Humidity: 97% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.01 in Heat Index: - Graphs

Location: EAST GRANITE, Granite City, IL

Updated: 10:16 PM CDT

Temperature: 77.0 °F Dew Point: 71 °F Humidity: 81% Wind: Calm Pressure: 29.91 in Hourly Precipitation: - Heat Index: 79 °F Graphs

Location: Dunlap Lake, Edwardsville, IL

Updated: 10:20 PM CDT

Temperature: 72.7 °F Dew Point: 72 °F Humidity: 96% Wind: Calm Pressure: 29.92 in Hourly Precipitation: 0.02 in Heat Index: - Graphs

Location: Kelly Greens Weather Station, Edwardsville, IL

Updated: 9:57 PM CDT

Temperature: 78.7 °F Dew Point: 72 °F Humidity: 80% Wind: Calm Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 82 °F Graphs

Location: Birmingham Drive, Glen Carbon, IL

Updated: 10:20 PM CDT

Temperature: 75.4 °F Dew Point: 69 °F Humidity: 81% Wind: North at - Pressure: 30.02 in Hourly Precipitation: - Heat Index: 76 °F Graphs

Location: Stonebridge Farms, Maryville, IL

Updated: 10:24 PM CDT

Temperature: 74.8 °F Dew Point: 70 °F Humidity: 86% Wind: ESE at 2.0 mph Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 74 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service St Louis MO 
328 PM CDT Monday Jul 27 2015 


Short term: (through late tonight) 
issued at 327 PM CDT Monday Jul 27 2015 


Weak frontal boundary across forecast area to lift northward tonight 
stalling out just east of Mississippi River. Will see isolated 
showers and storms this evening before diminishing after sunset. Hot 
and humid weather to persist with lows only in the 70s. 


Byrd 


Long term: (tuesday through next monday) issued at 327 PM CDT 
Monday Jul 27 2015 


(tuesday through thursday) 


Will be upgrading the western...southern and central part of the 
area including the St. Louis metropolitan area to an excessive heat warning 
through tomorrow evening. Several locations have had heat index 
values reach 110 degrees today including Missouri mesonet locations 
as well as Lambert Field. Quasi-stationary front has lingered over 
the area today as well as several outflow boundaries which has 
allowed dewpoints to pool and values to climb to around 80 in some 
cases. There has also been enough sunshine for temperatures to 
reach the lower to middle 90s in most locations. Set up tomorrow will 
be much like today with the boundary over the area and enough sun to 
allow temperatures to climb into the 90s as forecast soundings 
showing mixing above 850mb. Expect heat index values to climb into 
the 105 to 110+ range again tomorrow supporting the advisory and 
warning. Forecast soundings show little capping with the boundary 
in place...however the upper high will still be over the area so 
think this will limit coverage to just isolated thunderstorms. 


By Tuesday night into Wednesday...there will be a cold front moving 
through the area. Latest runs support the front moving quickly 
enough the area that the advisory/warning will not need to be 
extended into Wednesday. High pressure will build into area on 
Wednesday night and Thursday allowing for drier and cooler air to 
move in. 


(Friday through monday) 


European model (ecmwf) and GFS still look similar during this period as nortwesterly 
flow aloft will be over the area. The weekend still looks dry as 
surface high pressure moves across the area, both models are still 
indicating that a cold front will move through the area either 
Sunday night or Monday. The GFS is also depicting some light quantitative precipitation forecast 
over the area with the passage of this front, but the European model (ecmwf) is not. 
Temperatures will be near or just below average with 850mb 
temperatures of 15-20c. 


Britt 


&& 


Aviation: (for the 18z tafs through 18z Tuesday afternoon) 
issued at 1243 PM CDT Monday Jul 27 2015 


Warm frontal boundary is lingering just north of i70 corridor and 
should continue to slowly move north this afternoon before 
stalling out just east of Mississippi River. In the 
meantime, diurnal cumulus with some high thin cirrus through the 
forecast period. As for winds, to remain light and variable before 
picking up a bit from the south to southwest for taf sites along 
i70 by Tuesday morning, while KUIN will remain close to boundary 
and see east to southeast winds. Isolated storms possible but hard 
to pin down if they will affect taf sites, so left mention out for 
now. 


Specifics for kstl: 
warm frontal boundary is lingering just north of i70 corridor and 
should continue to slowly move north this afternoon before 
stalling out just east of Mississippi River. In the 
meantime, diurnal cumulus with some high thin cirrus through the 
forecast period. As for winds, to remain light and variable before 
picking up a bit from the south to southwest by 15z Tuesday. 
Isolated storms possible but hard to pin down if they will affect 
metropolitan area, so left mention out for now. 


Byrd 


&& 


Lsx watches/warnings/advisories: 
MO...excessive heat warning until 9 PM CDT Tuesday for Boone MO- 
Callaway MO-Cole MO-Crawford MO-Franklin MO-Gasconade MO- 
Iron MO-Jefferson MO-Lincoln MO-Madison MO-Moniteau MO- 
Montgomery MO-Osage MO-Reynolds MO-St. Charles MO-St. 
Francois MO-St. Louis city MO-St. Louis MO-Ste. Genevieve 
MO-Warren MO-Washington MO. 


Heat advisory until 9 PM CDT Tuesday for Audrain MO-Knox MO- 
Lewis MO-Marion MO-Monroe MO-Pike MO-Ralls MO-Shelby MO. 


Illinois...excessive heat warning until 9 PM CDT Tuesday for Calhoun Illinois- 
Jersey Illinois-Madison Illinois-Monroe Illinois-Randolph IL-St. Clair Illinois. 


Heat advisory until 9 PM CDT Tuesday for Adams Illinois-Bond Illinois-Brown 
Illinois-Clinton Illinois-Fayette Illinois-Greene Illinois-Macoupin Illinois-Marion Illinois- 
Montgomery Illinois-Pike Illinois-Washington Illinois. 


&& 


$$ 


Weather forecast office lsx 






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