Alton, Illinois Weather Conditions

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Current Conditions

  • 37°
  • Overcast
  • Wind: NNW 13 mph
  • Humidity: 93%
  • Visibility: 5.0 miles
  • Dew Point: 36°
  • Pressure: 29.71 in. +
  • Heat Index: 29

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Next 12 Hours

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6  pm
9  pm
12  am
3  am
Rain
Rain
Chance of Rain
Chance of Rain
Overcast
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Mostly Cloudy
Mostly Cloudy
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45°
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Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Sunday
  • Rain
  • High: 46 °
  • Low: 25 °
  • Rain
  • Monday
  • Partly Cloudy
  • High: 41 °
  • Low: 32 °
  • Partly Cloudy
  • Tuesday
  • Mostly Cloudy
  • High: 45 °
  • Low: 28 °
  • Mostly Cloudy
  • Wednesday
  • Partly Cloudy
  • High: 50 °
  • Low: 37 °
  • Partly Cloudy
  • Thursday
  • Partly Cloudy
  • High: 43 °
  • Low: 30 °
  • Partly Cloudy

Forecast for Alton, Illinois

Updated: 3:00 PM CST on January 25, 2015

  • Sunday

    Overcast with rain. High of 46F. Winds from the SW at 5 to 15 mph shifting to the NNW in the afternoon. Chance of rain 90%.

  • Sunday Night

    Overcast with a chance of snow in the evening, then mostly cloudy. Low of 25F. Breezy. Winds from the NNW at 10 to 25 mph with gusts to 30 mph.

  • Monday

    Overcast in the morning, then mostly cloudy. High of 41F. Winds from the NW at 5 to 10 mph shifting to the SW in the afternoon.

  • Monday Night

    Partly cloudy. Low of 32F with a windchill as low as 25F. Winds from the WSW at 5 to 15 mph shifting to the NW after midnight.

  • Tuesday

    Mostly cloudy in the morning, then overcast. High of 45F. Winds from the NNW at 10 to 15 mph.

  • Tuesday Night

    Mostly cloudy in the evening, then clear. Low of 28F. Winds from the North at 5 to 10 mph shifting to the ESE after midnight.

  • Wednesday

    Clear. High of 50F. Breezy. Winds from the SSE at 15 to 20 mph.

  • Wednesday Night

    Partly cloudy. Low of 37F. Breezy. Winds from the South at 15 to 20 mph.

  • Thursday

    Overcast. High of 43F. Breezy. Winds from the NW at 20 to 25 mph.

  • Thursday Night

    Partly cloudy. Low of 30F with a windchill as low as 23F. Breezy. Winds from the NNW at 10 to 20 mph.

  • Friday

    Clear. High of 43F. Winds from the NNE at 5 to 10 mph.

  • Friday Night

    Partly cloudy. Low of 28F. Winds from the ENE at 5 to 10 mph shifting to the ESE after midnight.

  • Saturday

    Clear. High of 43F. Winds from the SW at 5 to 10 mph.

  • Saturday Night

    Clear. Fog overnight. Low of 16F. Winds from the SW at 5 to 10 mph shifting to the NW after midnight.

  • Sunday

    Partly cloudy. High of 48F. Winds from the WNW at 5 to 15 mph shifting to the SW in the afternoon.

  • Sunday Night

    Clear. Fog overnight. Low of 16F with a windchill as low as 3F. Breezy. Winds from the SSW at 10 to 20 mph.

  • Monday

    Clear. Fog early. High of 21F with a windchill as low as 1F. Winds from the WNW at 5 to 20 mph.

  • Monday Night

    Clear. Fog overnight. Low of 16F. Winds less than 5 mph.

  • Tuesday

    Clear. High of 23F. Winds less than 5 mph.

  • Tuesday Night

    Clear. Fog overnight. Low of 18F. Winds less than 5 mph.

  • Wednesday

    Clear. Fog early. High of 25F. Winds less than 5 mph.

  • Wednesday Night

    Clear. Fog overnight. Low of 21F. Winds less than 5 mph.

  • Thursday

    Clear. Fog early. High of 45F. Winds less than 5 mph.

  • Thursday Night

    Clear. Low of 21F. Winds from the SSE at 5 to 10 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Alton, IL

Updated: 4:13 PM CST

Temperature: 37.9 °F Dew Point: 35 °F Humidity: 90% Wind: North at 13.0 mph Pressure: 29.72 in Hourly Precipitation: 0.00 in Windchill: 30 °F Graphs

Location: Alton - Christian Hill Area, Alton, IL

Updated: 4:15 PM CST

Temperature: 36.8 °F Dew Point: 34 °F Humidity: 90% Wind: NW at 4.0 mph Pressure: 29.72 in Hourly Precipitation: 0.00 in Windchill: 34 °F Graphs

Location: APRSWXNET Alton IL US, Alton, IL

Updated: 3:49 PM CST

Temperature: 38 °F Dew Point: 38 °F Humidity: 99% Wind: Calm Pressure: 29.71 in Hourly Precipitation: 0.00 in Windchill: 38 °F Graphs

Location: Alton - Rock Gate Estates, Alton, IL

Updated: 4:16 PM CST

Temperature: 36.9 °F Dew Point: 37 °F Humidity: 99% Wind: ENE at 4.3 mph Pressure: 29.75 in Hourly Precipitation: 0.00 in Windchill: 33 °F Graphs

Location: Milton Area - Oscar, Alton, IL

Updated: 4:09 PM CST

Temperature: 38.3 °F Dew Point: 37 °F Humidity: 94% Wind: NW at 3.0 mph Pressure: 29.70 in Hourly Precipitation: 0.00 in Windchill: 38 °F Graphs

Location: Brecht Ln, Godfrey, IL

Updated: 4:07 PM CST

Temperature: 36.3 °F Dew Point: 36 °F Humidity: 98% Wind: NE at 5.8 mph Pressure: 29.57 in Hourly Precipitation: - Windchill: 32 °F Graphs

Location: WEST ALTON, West Alton, MO

Updated: 4:10 PM CST

Temperature: 41.4 °F Dew Point: - Humidity: - Wind: North at - Pressure: - Hourly Precipitation: - Windchill: 41 °F Graphs

Location: Godfrey River Aire Subdivision, Godfrey, IL

Updated: 4:16 PM CST

Temperature: 35.8 °F Dew Point: 34 °F Humidity: 94% Wind: WNW at 3.0 mph Pressure: 29.71 in Hourly Precipitation: 0.00 in Windchill: 36 °F Graphs

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

Updated: 3:48 PM CST

Temperature: 39.7 °F Dew Point: 38 °F Humidity: 92% Wind: West at 3.7 mph Pressure: 29.32 in Hourly Precipitation: - Windchill: 37 °F Graphs

Location: APRSWXNET East Alton IL US, Wood River, IL

Updated: 3:23 PM CST

Temperature: 40 °F Dew Point: 38 °F Humidity: 92% Wind: North at 4 mph Pressure: 29.54 in Hourly Precipitation: 0.02 in Windchill: 37 °F Graphs

Location: Rosewood Heights, East Alton, IL

Updated: 4:16 PM CST

Temperature: 37.3 °F Dew Point: 35 °F Humidity: 92% Wind: North at 4.0 mph Pressure: 29.72 in Hourly Precipitation: 0.00 in Windchill: 34 °F Graphs

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

Updated: 4:01 PM CST

Temperature: 38.5 °F Dew Point: 37 °F Humidity: 93% Wind: North at 7.8 mph Pressure: 29.39 in Hourly Precipitation: - Windchill: 33 °F Graphs

Location: Foster Township, Alton, IL

Updated: 4:04 PM CST

Temperature: 37.4 °F Dew Point: 36 °F Humidity: 95% Wind: NNE at 14.5 mph Pressure: 29.70 in Hourly Precipitation: - Windchill: 29 °F Graphs

Location: Jersey County along IL 111, Brighton, IL

Updated: 4:16 PM CST

Temperature: 36.1 °F Dew Point: 33 °F Humidity: 89% Wind: NNE at 6.0 mph Pressure: 29.41 in Hourly Precipitation: 0.00 in Windchill: 31 °F Graphs

Location: Timber Ridge, Godfrey, IL

Updated: 4:15 PM CST

Temperature: 36.3 °F Dew Point: 35 °F Humidity: 94% Wind: SW at 2.0 mph Pressure: 29.75 in Hourly Precipitation: 0.00 in Windchill: 36 °F Graphs

Location: Bethalto, IL

Updated: 4:16 PM CST

Temperature: 37.8 °F Dew Point: -10 °F Humidity: 12% Wind: West at 5.4 mph Pressure: 35.42 in Hourly Precipitation: 0.00 in Windchill: 34 °F Graphs

Location: Riverside at Albers Pointe, Florissant, MO

Updated: 4:04 PM CST

Temperature: 39.0 °F Dew Point: 35 °F Humidity: 88% Wind: North at - Pressure: 29.70 in Hourly Precipitation: - Windchill: 39 °F Graphs

Location: Jost Farm, Florissant, MO

Updated: 4:15 PM CST

Temperature: 37.2 °F Dew Point: 31 °F Humidity: 77% Wind: SSE at 3.8 mph Pressure: 29.78 in Hourly Precipitation: 0.00 in Windchill: 34 °F Graphs

Location: MesoWest NAMOK2 IL US UPR, Granite City, IL

Updated: 3:20 PM CST

Temperature: 43 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Windchill: 43 °F Graphs

Location: Grand Ave, Edwardsville, IL

Updated: 4:16 PM CST

Temperature: 38.5 °F Dew Point: 37 °F Humidity: 95% Wind: Calm Pressure: 29.80 in Hourly Precipitation: 0.01 in Windchill: 38 °F Graphs

Location: APRSWXNET Edwardsville IL US, Edwardsville, IL

Updated: 3:34 PM CST

Temperature: 40 °F Dew Point: 38 °F Humidity: 94% Wind: Calm Pressure: 29.76 in Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: Riverwood Place, Florissant, MO

Updated: 4:16 PM CST

Temperature: 37.7 °F Dew Point: 36 °F Humidity: 94% Wind: NNW at 2.0 mph Pressure: 29.78 in Hourly Precipitation: 0.00 in Windchill: 38 °F Graphs

Location: Nickel Plate Trail, Edwardsville, IL

Updated: 4:15 PM CST

Temperature: 38.3 °F Dew Point: 37 °F Humidity: 95% Wind: North at 5.0 mph Pressure: 29.72 in Hourly Precipitation: 0.00 in Windchill: 34 °F Graphs

Location: EAST GRANITE, Granite City, IL

Updated: 4:13 PM CST

Temperature: 40.1 °F Dew Point: 38 °F Humidity: 91% Wind: NNE at 3.7 mph Pressure: 29.69 in Hourly Precipitation: - Windchill: 38 °F Graphs

Location: APRSWXNET Edwardsville IL US, Edwardsville, IL

Updated: 3:28 PM CST

Temperature: 40 °F Dew Point: 39 °F Humidity: 95% Wind: NE at 3 mph Pressure: 29.68 in Hourly Precipitation: 0.01 in Windchill: 40 °F Graphs

Location: Dunlap Lake, Edwardsville, IL

Updated: 4:13 PM CST

Temperature: 38.2 °F Dew Point: 37 °F Humidity: 95% Wind: WNW at 4.0 mph Pressure: 29.72 in Hourly Precipitation: 0.00 in Windchill: 35 °F Graphs

Location: Kelly Greens Weather Station, Edwardsville, IL

Updated: 4:16 PM CST

Temperature: 38.0 °F Dew Point: 37 °F Humidity: 95% Wind: NNW at 5.0 mph Pressure: 29.73 in Hourly Precipitation: 0.00 in Windchill: 34 °F Graphs

Location: Birmingham Drive, Glen Carbon, IL

Updated: 4:16 PM CST

Temperature: 39.0 °F Dew Point: 36 °F Humidity: 88% Wind: North at - Pressure: 29.75 in Hourly Precipitation: - Windchill: 39 °F Graphs

Location: Prairie Manor, Edwardsville, IL

Updated: 4:16 PM CST

Temperature: 37.8 °F Dew Point: 38 °F Humidity: 99% Wind: NNW at 8.1 mph Pressure: 8.86 in Hourly Precipitation: 0.00 in Windchill: 32 °F Graphs

Location: Barbarotto Compound, Maryville, IL

Updated: 4:16 PM CST

Temperature: 38.6 °F Dew Point: 37 °F Humidity: 93% Wind: NW at 6.0 mph Pressure: 29.65 in Hourly Precipitation: 0.01 in Windchill: 34 °F Graphs

Location: 1 Mile South of St. Louis Lambert Airport, Woodson Terrace, MO

Updated: 3:59 PM CST

Temperature: 37.8 °F Dew Point: 36 °F Humidity: 92% Wind: NNW at 2.0 mph Pressure: 29.76 in Hourly Precipitation: 0.00 in Windchill: 38 °F Graphs

Location: Rolling Meadows Dr, Maryville, IL

Updated: 4:16 PM CST

Temperature: 39.2 °F Dew Point: 36 °F Humidity: 89% Wind: WNW at 3.1 mph Pressure: 29.06 in Hourly Precipitation: 0.00 in Windchill: 37 °F Graphs

Location: Polestar Boating Center, St. Charles, MO

Updated: 4:16 PM CST

Temperature: 37.8 °F Dew Point: 36 °F Humidity: 92% Wind: North at 11.0 mph Pressure: 29.83 in Hourly Precipitation: 0.02 in Windchill: 30 °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 
344 PM CST sun Jan 25 2015 


Short term: (through late tonight) 
issued at 323 PM CST sun Jan 25 2015 


Precip over the County Warning Area should be winding down over the next few hours 
as upper level impulse works its way southeast into the Ohio Valley. 
Deformation zone that was so well defined this morning over Iowa and 
N Illinois certainly falling apart as the afternoon progresses, and have 
used a combination of regional radar and hrrr for pop/weather 
trends heading into the early evening. It would appear that the northwest 
edge of the precip (now all snow) will be near a kcou-kilx line 
by 00z, with the precip dropping southeast and exiting 
southeast sections of the County Warning Area no later than 06z. Surface obs trends this 
afternoon indicate that rain begins mixing with snow @ 36-37 and 
is all snow at 34 or colder, and will use this for ptypes for the 
rest of the afternoon and into the early evening. Given warm 
ground and the light intensity of the precip once it GOES to all 
snow, accumulations should continue to be very minor. 


Other question for tonight is how much clearing will occur as the 
storm exits and a narrow ridge of high pressure works into the 
region. Over the last few hours have seen a wedge of clearing 
wrapping around the surface low from S WI into NE Iowa. Some of this 
clearing may reach our area, but there is also a lot of additional 
low cloud to our north that will advect our way as well, so for 
now have only gone with partial clearing during the late evening 
and overnight hours. 


Truett 


Long term: (monday through next sunday) 
issued at 323 PM CST sun Jan 25 2015 


(monday-wednesday) 


Overall, going forecast heading into midweek still looks pretty 
good, so this package will include generally minor adjustments and 
tweaks to these trends. 


Fast moving shortwave in northwest flow will zip into the region on 
Monday, with warm air advection in advance of this feature rapidly shutting down 
the cold air advection occuring overnight in the wake of today's clipper. 12z 
synoptic runs are suggesting a fairly strong north-S warm front will be 
located near or just west of stl by late Monday afternoon and have 
attempted to reflect this in Max temp forecast, allowing highs to 
rebound into the middle 50s over mid MO while keeping highs in the 
30s over our S Illinois counties. This temp trend also seems to be 
supported by the model relative humidity progs which suggest a fairly thick mid 
deck sweeping from west to east across the area in the zone of warm air advection during 
the day, with the most clouds over our eastern counties during the 
afternoon. Some 12z guidance is even trying to kick out some 
light quantitative precipitation forecast near and east of the Mississippi River in the zone of 
strongest warm air advection. Have continued dry forecast for now, but will need 
to keep an eye on this as there has been some very subtle suggestions 
of this for several days. 


The cold air advection behind monday's shortwave will try to dip 
into the area Monday night, but with the longwave trof working into 
the East Coast during this time the main thrust of this cooler air 
will be east of our area. Model consensus of thermal profiles over 
the region support highs in the 40s over most of the County Warning Area by Tuesday 
as weak surface ridge drops into the Mississippi Valley. 


Warmup still appears to be on schedule for Wednesday, and main 
question is how much of the warming will be able to translate to the 
surface. Forecast soundings are suggesting a large inversion, with 
low level mixing up to 900-950mb. Surface/low level winds...while 
strong...are going to primarily be southerly rather than the 
southwest direction that normally gives US our biggest warmups. 
Also some doubt to how much cloud cover there will be, as GFS 
suggests some mid clouds working into the area during the afternoon 
while NAM suggests lots of sunshine. Due to the above uncertainty 
will keep highs about where they are now...ranging from the mid 40s 
in our far eastern counties to near 60 in the far western tip of our 
County Warning Area. 


(Thursday-sunday) 


Shortwave that works across the region Wednesday night and early 
Thursday appears to be the first of several chunks of energy that 
will be deepening long wave trof over the eastern U.S. Heading into 
the weekend, while cutoff low forms over the southwestern U.S. 
Medium range solutions are in very broad agreement in developing 
this split flow pattern, and in general this should mean temps 
trending back towards more wintry levels after the mid-week warmup. 
Will continue some slight chance pops on Wednesday night/Thursday 
for eastern parts of the forecast area in advance of aforementioned shortwave, 
with slight chance pops also continuing for parts of the forecast area on 
Saturday and Saturday night as there is agreement in the medium 
range models that warm air advection, a bit of shortwave energy, and a frontal 
boundary will be passing through the area at that time. 


Guidance is in reasonable agreement with their thermal profiles 
through Saturday, but much like yesterday the operational European model (ecmwf) 
continues to be deepest with the upper trof and much colder than the 
GFS by the end of the period (it's intesting to note that last 
nights European model (ecmwf)-based MOS had over a 40 degree difference between the 
warm and cold members for sunday's highs (58 vs 16). For now, will 
lean towards MOS averages for temp trends on Sunday...which will be 
in the 30s. This seems to be a reasonable compromise at this point, 
with additional adjustments occurring as specific trends become less 
muddled. 


Truett 


&& 


Aviation: (for the 18z tafs through 18z Monday afternoon) 
issued at 1142 am CST sun Jan 25 2015 


Low pressure centered just to the east-southeast of St. Louis will 
continue moving east-southeast through tonight. Light rain falling 
across much of the area will continue into the afternoon, changing 
to light snow before ending early this evening. MVFR conditions 
south of the I-70 corridor are expected to fall to IFR this 
afternoon. IFR flight conditions are expected to continue to 
prevail at least into the early evening, with improving ceilings 
and visibilities as the precipitation comes to and end and the low 
moves further east. Some guidance suggests that the low clouds 
will scatter out overnight, however am siding with more pessimistic 
models at this time as there is a lot of MVFR and even IFR up 
across the Dakotas, Iowa, Minnesota, and Wisconsin. One other 
feature of note, wind will be increasing substantially later this 
afternoon as the low pulls away. Expect north-northwest wind 
sustained between 15 to 20 kts with gusts potentially up to 30 kts. 


Specifics for kstl: 


Expect IFR ceilings and at times IFR visibilities in light 
rain/drizzle this afternoon. Wind will increase to the northwest 
later sustained between 15 and 20 kts with gusts between 25 and 
30 kts. Still expecting a little snow late this afternoon or early 
this evening. Confidence in the exact timing of the snow is not 
especially high though. Did not want to change the current 23z 
transition time for the 18z taf because of this, but an hour on 
either side of 23z still seems like the most likely. Snow should 
end quickly this evening with ceilings between 1000-2000 feet 
persisting through Monday morning. 


Carney 


&& 


Lsx watches/warnings/advisories: 
MO...none. 
Illinois...none. 
&& 


$$ 


Weather forecast office lsx 



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