Alton, Illinois Weather Conditions

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Current Conditions

  • 73°
  • Mostly Cloudy
  • Wind: SSE 10 mph
  • Humidity: N/A%
  • Visibility: 4.0 miles
  • Pressure: 30.03 in. +

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Next 12 Hours

8  am
11  am
2  pm
5  pm
8  pm
Fog
Fog
Partly Cloudy
Partly Cloudy
Mostly Cloudy
Mostly Cloudy
Chance of a Thunderstorm
Chance of T-storms
Chance of a Thunderstorm
Chance of T-storms
70°
80°
86°
84°
80°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Monday
  • Chance of a Thunderstorm
  • High: 89 °
  • Low: 71 °
  • Chance of T-Storms
  • Tuesday
  • Thunderstorm
  • High: 73 °
  • Low: 60 °
  • T-Storms
  • Wednesday
  • Chance of a Thunderstorm
  • High: 72 °
  • Low: 66 °
  • Chance of T-Storms
  • Thursday
  • Chance of a Thunderstorm
  • High: 83 °
  • Low: 66 °
  • Chance of T-Storms
  • Friday
  • Clear
  • High: 92 °
  • Low: 71 °
  • Clear

Forecast for Alton, Illinois

Updated: 7:00 AM CDT on January 06, 2015

Flash Flood Watch in effect from this evening through Wednesday evening...
  • Monday

    Partly cloudy early followed by scattered thunderstorms this afternoon. High 89F. Winds S at 10 to 20 mph. Chance of rain 50%.

  • Monday Night

    Isolated thunderstorms early, then mainly cloudy overnight with thunderstorms likely. Low 71F. Winds SSW at 5 to 10 mph. Chance of rain 80%.

  • Tuesday

    Showers and thunderstorms. High 73F. Winds NW at 10 to 15 mph. Chance of rain 80%.

  • Tuesday Night

    Considerable cloudiness with occasional rain showers. Low near 60F. Winds NE at 5 to 10 mph. Chance of rain 70%.

  • Wednesday

    Scattered showers and thunderstorms. High 72F. Winds E at 10 to 15 mph. Chance of rain 60%.

  • Wednesday Night

    Variable clouds with scattered thunderstorms. Low 66F. Winds SSW at 10 to 15 mph. Chance of rain 60%.

  • Thursday

    Scattered thunderstorms developing during the afternoon. High 83F. Winds WSW at 10 to 15 mph. Chance of rain 50%.

  • Thursday Night

    Variably cloudy with scattered thunderstorms. Low 66F. Winds light and variable. Chance of rain 50%.

  • Friday

    Sunny skies. High 92F. Winds SW at 10 to 15 mph.

  • Friday Night

    A mostly clear sky. Low 71F. Winds SW at 5 to 10 mph.

  • Saturday

    Sun and a few passing clouds. High 91F. Winds SW at 10 to 15 mph.

  • Saturday Night

    Clear skies. Low 71F. Winds SW at 5 to 10 mph.

  • Sunday

    Sunny. High 91F. Winds SW at 10 to 15 mph.

  • Sunday Night

    A mostly clear sky. Low 71F. Winds WSW at 5 to 10 mph.

  • Monday

    Mostly sunny skies during the morning hours. Scattered showers and thunderstorms developing in the afternoon. High 87F. Winds W at 10 to 15 mph. Chance of rain 40%.

  • Monday Night

    A mostly clear sky. Low 67F. Winds N at 5 to 10 mph.

  • Tuesday

    Mixed clouds and sun with scattered thunderstorms. High 82F. Winds N at 10 to 15 mph. Chance of rain 40%.

  • Tuesday Night

    Partly cloudy. Low 66F. Winds NE at 5 to 10 mph.

  • Wednesday

    Partly cloudy skies. High 83F. Winds NE at 10 to 15 mph.

  • Wednesday Night

    Mostly clear skies. Low 66F. Winds E at 5 to 10 mph.

  • Thursday

    Mostly sunny skies. High 86F. Winds SE at 5 to 10 mph.

  • Thursday Night

    Clear skies. Low 68F. Winds SE at 5 to 10 mph.

Severe Weather Alert Descriptions

 Flood Warning  Statement as of 9:49 PM CDT on July 5, 2015


The Flood Warning continues for
the Mississippi River at mel price lock & dam.
* At 9 PM Sunday the stage was 29.1 feet.
* Flood stage is 21.0 feet.
* Moderate flooding is occurring.
* Forecast: the river will fall below flood stage by Friday afternoon.

                   Fld latest 7 a.M. Forecast
location stg obs stg 07/06 07/07 07/08 07/09 07/10

Mississippi River
mel price lock 21.0 29.07 28.6 26.6 24.3 22.5 21.3




Lat... Lon 3891 9033 3895 9028 3883 9003 3881 9017
      3886 9017







 Flash Flood Watch  Statement as of 3:55 am CDT on July 6, 2015


... Flash Flood Watch in effect from this evening through
Wednesday evening...

The National Weather Service in St Louis has issued a

* Flash Flood Watch for portions of Illinois and Missouri...
including the following counties... in Illinois... Adams IL...
Brown IL... Calhoun IL... Greene IL... Jersey IL... Macoupin IL...
Madison IL... Monroe IL... Pike IL and St. Clair IL. In
Missouri... Audrain MO... Boone MO... Callaway MO... Cole MO...
Crawford MO... Franklin MO... Gasconade MO... Jefferson MO... Knox
MO... Lewis MO... Lincoln MO... Marion MO... Moniteau MO... Monroe
MO... Montgomery MO... Osage MO... Pike MO... Ralls MO... Shelby
MO... St. Charles MO... St. Louis city MO... St. Louis MO...
Warren MO and Washington MO.

* From this evening through Wednesday evening

* several rounds of thunderstorms will bring heavy rainfall and
the potential of flash flooding to the region tonight through
Wednesday. Widespread two day rainfall totals of 2 to 4 inches
are likely... with localized amounts exceeding 5 inches.

* Heavy rainfall will result in flooding of low lying or poor
drainage areas... and ultimately dangerous flash flooding on
smaller creeks and streams. Significant rises on larger
streams and rivers will also be possible.

Precautionary/preparedness actions...

A Flash Flood Watch means that flash flooding is possible but not
imminent in the watch area. People in the watch area should be
aware of the possibility of heavy rainfall and flash flooding.
Check your preparedness requirements... especially if you live in
flood prone areas. Stay informed... and be ready for quick action
if flooding is observed or if a Flash Flood Warning is issued.



Cvking




Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Alton, IL

Updated: 8:24 AM CDT

Temperature: 78.4 °F Dew Point: 74 °F Humidity: 86% Wind: Calm Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 81 °F Graphs

Location: Alton - Beacon, Alton, IL

Updated: 8:29 AM CDT

Temperature: 77.2 °F Dew Point: 74 °F Humidity: 89% Wind: East at 2.9 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 79 °F Graphs

Location: Alton - Christian Hill Area, Alton, IL

Updated: 8:25 AM CDT

Temperature: 76.1 °F Dew Point: 73 °F Humidity: 90% Wind: SSE at 2.0 mph Pressure: 29.95 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Alton - Rock Gate Estates, Alton, IL

Updated: 8:28 AM CDT

Temperature: 76.1 °F Dew Point: 73 °F Humidity: 90% Wind: South at 4.2 mph Pressure: 29.99 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Milton Area - Oscar, Alton, IL

Updated: 8:16 AM CDT

Temperature: 77.6 °F Dew Point: 74 °F Humidity: 87% Wind: SW at 1.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Heat Index: 80 °F Graphs

Location: Chelsea Court, Godfrey, IL

Updated: 8:29 AM CDT

Temperature: 79.3 °F Dew Point: 72 °F Humidity: 79% Wind: West at 5.3 mph Pressure: 29.40 in Hourly Precipitation: 0.00 in Heat Index: 83 °F Graphs

Location: Brecht Ln, Godfrey, IL

Updated: 8:19 AM CDT

Temperature: 80.6 °F Dew Point: 79 °F Humidity: 94% Wind: Calm Pressure: 29.86 in Hourly Precipitation: - Heat Index: 88 °F Graphs

Location: Godfrey River Aire Subdivision, Godfrey, IL

Updated: 8:01 AM 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: Wood River (West End), Wood River, IL

Updated: 8:26 AM CDT

Temperature: 80.2 °F Dew Point: 72 °F Humidity: 77% Wind: Calm Pressure: 29.67 in Hourly Precipitation: - Heat Index: 84 °F Graphs

Location: Whispering Oaks Drive, Bethalto, IL

Updated: 8:11 AM CDT

Temperature: 77.2 °F Dew Point: 72 °F Humidity: 84% Wind: North at - Pressure: 30.10 in Hourly Precipitation: - Heat Index: 79 °F Graphs

Location: Foster Township, Alton, IL

Updated: 8:28 AM CDT

Temperature: 81.7 °F Dew Point: 79 °F Humidity: 91% Wind: SW at 3.7 mph Pressure: 29.96 in Hourly Precipitation: - Heat Index: 91 °F Graphs

Location: Jersey County along IL 111, Brighton, IL

Updated: 8:28 AM CDT

Temperature: 77.7 °F Dew Point: 73 °F Humidity: 86% Wind: Calm Pressure: 29.68 in Hourly Precipitation: 0.00 in Heat Index: 80 °F Graphs

Location: Timber Ridge, Godfrey, IL

Updated: 8:25 AM CDT

Temperature: 75.7 °F Dew Point: 74 °F Humidity: 94% Wind: SSE at 2.0 mph Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 75 °F Graphs

Location: Riverside at Albers Pointe, Florissant, MO

Updated: 8:24 AM CDT

Temperature: 73.9 °F Dew Point: 74 °F Humidity: 98% Wind: North at - Pressure: 29.97 in Hourly Precipitation: - Heat Index: 70 °F Graphs

Location: Alber Pointe Drive, Florissant, MO

Updated: 8:26 AM CDT

Temperature: 74.5 °F Dew Point: 74 °F Humidity: 98% Wind: North at - Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 71 °F Graphs

Location: Fox Lake Meadows, Florissant, MO

Updated: 8:21 AM CDT

Temperature: 79.9 °F Dew Point: 73 °F Humidity: 79% Wind: South at 3.2 mph Pressure: 29.95 in Hourly Precipitation: - Heat Index: 84 °F Graphs

Location: Jost Farm, Florissant, MO

Updated: 8:25 AM CDT

Temperature: 82.9 °F Dew Point: 63 °F Humidity: 51% Wind: SW at 3.8 mph Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: 84 °F Graphs

Location: Grand Ave, Edwardsville, IL

Updated: 8:29 AM CDT

Temperature: 77.9 °F Dew Point: 76 °F Humidity: 95% Wind: Calm Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 80 °F Graphs

Location: Knight Compound, Dorsey, IL

Updated: 8:29 AM CDT

Temperature: 73.7 °F Dew Point: 74 °F Humidity: 100% Wind: Calm Pressure: 29.81 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Southland Estates, Jerseyville, IL

Updated: 8:29 AM CDT

Temperature: 75.9 °F Dew Point: 73 °F Humidity: 90% Wind: SSE at 3.6 mph Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Riverwood Place, Florissant, MO

Updated: 8:29 AM CDT

Temperature: 80.1 °F Dew Point: 75 °F Humidity: 84% Wind: South at 3.0 mph Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 85 °F Graphs

Location: 27th Street, Granite City, IL

Updated: 8:26 AM CDT

Temperature: 75.9 °F Dew Point: 72 °F Humidity: 88% Wind: North at - Pressure: 30.06 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Nickel Plate Trail, Edwardsville, IL

Updated: 8:25 AM CDT

Temperature: 74.2 °F Dew Point: 73 °F Humidity: 95% Wind: Calm Pressure: 29.97 in Hourly Precipitation: 0.00 in Heat Index: 71 °F Graphs

Location: EAST GRANITE, Granite City, IL

Updated: 8:26 AM CDT

Temperature: 77.4 °F Dew Point: 72 °F Humidity: 82% Wind: South at 2.2 mph Pressure: 29.95 in Hourly Precipitation: - Heat Index: 79 °F Graphs

Location: Dunlap Lake, Edwardsville, IL

Updated: 8:26 AM CDT

Temperature: 75.5 °F Dew Point: 73 °F Humidity: 93% Wind: Calm Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 75 °F Graphs

Location: Birmingham Drive, Glen Carbon, IL

Updated: 8:25 AM CDT

Temperature: 74.5 °F Dew Point: 71 °F Humidity: 88% Wind: North at - Pressure: 30.05 in Hourly Precipitation: - Heat Index: 74 °F Graphs

Location: Stonebridge Farms, Maryville, IL

Updated: 8:29 AM CDT

Temperature: 78.4 °F Dew Point: 73 °F Humidity: 84% Wind: South at 6.0 mph Pressure: 29.96 in Hourly Precipitation: 0.00 in Heat Index: 81 °F Graphs

Location: Barbarotto Compound, Maryville, IL

Updated: 8:29 AM CDT

Temperature: 77.3 °F Dew Point: 74 °F Humidity: 88% Wind: ESE at 4.0 mph Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: 79 °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 
359 am CDT Monday Jul 6 2015 


Short term: (through late this afternoon) 
issued at 359 am CDT Monday Jul 6 2015 


Today looks like a typical Summer day with scattered showers and 
thunderstorms developing during the afternoon. Dps are forecast to 
increase into the low/middle 70s by afternoon. Combine those with temperatures in 
the middle 80s to near 90 will produce a unstable conditions with 
around 1000 j/kg of cape by afternoon with any cap having eroded by 
late morning. A subtle short wave is expected to trigger convection 
across the Ozarks between 16z-18z. This activity should then drift 
north while slowly increasing in coverage through the afternoon. While the 
overall coverage isn't expected to be all that great, precipitable waters  of 1.5" 
to 2" means that any storms will be capable of locally heavy 
rainfall. This activity should begin to diminish in intensity and 
coverage during the evening. Attention then turns to a cold front 
approaching from the northwest. 


Miller 


Long term: (tonight through sunday) 
issued at 359 am CDT Monday Jul 6 2015 


Have issued a Flash Flood Watch from tonight through Wednesday for a 
large section of the County Warning Area in collaboration with Kansas City and 
Springfield Missouri offices. The scenario that has been discussed 
the last few days remains unchanged with a cold front moving into 
the area this evening from the northwest and then becoming nearly 
stationary across the area on Tuesday. In addition...nearly all 
guidance now depicts a surface wave developing and traversing the 
area Tuesday night and Wednesday. Finally...with precipitable water values forecast 
to be in excess of two inches it would seem that all the ingredients 
are in place for heavy rainfall to occur. Generally believe 
widespread two day rainfall totals of 2 to 4 inches are likely in 
the watch area...with localized amounts exceeding 5 inches. After a 
typically warm and humid day today...temperatures will drop below 
normal Tuesday and Wednesday with the expected cloud cover and 
precipitation. 


Upper level ridge begins to build north into the region by the end 
of the week with the best chances of precipitation gradually lifting 
north of the area. Temperatures will return to normal Summer values 
with highs in the upper 80s and lower 90s next weekend. 


Cvking 


&& 


Aviation: (for the 06z tafs through 06z Monday night) 
issued at 1142 PM CDT sun Jul 5 2015 


Expect visibilities will continue to waver between 4-6sm for much of the 
rest of the night. I think there's too much boundary layer wind to 
support fog much thicker than that. However...noticed that kuno 
came in with an 800ft ceiling at 0435z. Expect these IFR ceilings 
to spread north-northeast through the rest of the night. Not 
really sure how far northeast these low clouds will get before 
sunrise, but areas south of the I-70 corridor are definitely under 
the gun. Model guidance doesn't seem to be too interested in 
spreading the ceilings as far north as I-70, but I can't rule it 
out. Stratus and fog/haze should dissipate within 1-3 hours of 
sunrise. There may also be some isolated showers or thunderstorms 
after 12z Monday morning, but the wide-spread nature of this 
precipitation makes it unlikely to affect any of the taf sites. 
Remainder of Monday should be VFR with increasing south-southwest 
flow...becoming gusty up to around 20kts in the afternoon. Some 
scattered showers and thunderstorms are possible as well, most 
likely over parts of southeast into east central Missouri. More 
widespread thunderstorm activity will be possible on Monday 
evening...mostly over northeast Missouri. 


Specifics for kstl: 


Expect visibility at Lambert to waver between 5-6sm for the rest of the 
night. There is a chance that stratus which is in the process of 
forming over south central Missouri may move up to overspread the 
terminal by sunrise, but the chance this will happen does not look 
high enough to put a ceiling in the taf at this time. Isolated 
showers and possibly a thunderstorm may be in the vicinity of the 
terminal during the morning...but like the stratus it looks like 
probabilities are low that any precipitation will affect the 
terminal. VFR flight conditions are expected Monday with 
increasing south-southwest flow...becoming gusty in the afternoon. 
There's a better chance of a thunderstorm in the afternoon...but 
probably only 30% at best. VFR conditions are expected Monday 
evening...but there's another chance of thunderstorms 
overnight...timing and coverage are still uncertain so have left 
mention out for now. 


Carney 


&& 


Preliminary point temperatures/pops: 
Saint Louis 90 73 79 64 / 40 60 80 80 
Quincy 87 66 74 58 / 40 90 60 50 
Columbia 88 68 73 65 / 50 90 70 80 
Jefferson City 89 71 74 65 / 50 80 80 80 
Salem 89 73 81 64 / 20 40 80 60 
Farmington 87 73 82 67 / 40 40 80 80 


&& 


Lsx watches/warnings/advisories: 
MO...Flash Flood Watch from this evening through Wednesday evening 
for Audrain MO-Boone MO-Callaway MO-Cole MO-Crawford MO- 
Franklin MO-Gasconade MO-Jefferson MO-Knox MO-Lewis MO- 
Lincoln MO-Marion MO-Moniteau MO-Monroe MO-Montgomery MO- 
Osage MO-Pike MO-Ralls MO-Shelby MO-St. Charles MO-St. 
Louis city MO-St. Louis MO-Warren MO-Washington MO. 


Illinois...Flash Flood Watch from this evening through Wednesday evening 
for Adams Illinois-Brown Illinois-Calhoun Illinois-Greene Illinois-Jersey Illinois- 
Macoupin Illinois-Madison Illinois-Monroe Illinois-Pike IL-St. Clair Illinois. 


&& 


$$ 


Weather forecast office lsx 



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