Herculaneum, Missouri Weather Conditions

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Current Conditions

  • 42°
  • Overcast
  • Wind: SE 9 mph
  • Humidity: 67%
  • Visibility: 10.0 miles
  • Dew Point: 32°
  • Pressure: 29.92 in. -
  • Heat Index: 37

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Next 12 Hours

12  am
3  am
6  am
9  am
12  pm
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Chance of Rain
Chance of Rain
Rain
Rain
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41°
37°
37°
41°
45°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Monday
  • Rain
  • High: 50 °
  • Low: 45 °
  • Rain
  • Tuesday
  • Chance of Rain
  • High: 50 °
  • Low: 37 °
  • Chance of Rain
  • Wednesday
  • Chance of Rain
  • High: 41 °
  • Low: 30 °
  • Chance of Rain
  • Thursday
  • Partly Cloudy
  • High: 50 °
  • Low: 36 °
  • Partly Cloudy
  • Friday
  • Mostly Cloudy
  • High: 52 °
  • Low: 25 °
  • Mostly Cloudy

Forecast for Herculaneum, Missouri

Updated: 9:00 PM CST on December 21, 2014

  • Monday

    Overcast with rain. High of 50F. Winds from the SSE at 10 to 15 mph. Chance of rain 70%.

  • Monday Night

    Overcast with a chance of rain. Low of 45F. Winds from the South at 5 to 15 mph. Chance of rain 50%.

  • Tuesday

    Overcast with a chance of rain. High of 50F. Winds from the WSW at 5 to 10 mph. Chance of rain 30%.

  • Tuesday Night

    Overcast with a chance of rain. Low of 37F. Winds from the NW at 5 to 10 mph. Chance of rain 50%.

  • Wednesday

    Overcast with a chance of snow and a chance of rain. High of 41F. Winds from the NW at 10 to 15 mph. Chance of snow 40%.

  • Wednesday Night

    Overcast. Low of 30F. Winds from the West at 10 to 15 mph.

  • Thursday

    Clear in the morning, then partly cloudy. High of 50F. Winds from the SW at 10 to 15 mph.

  • Thursday Night

    Partly cloudy. Low of 36F with a windchill as low as 28F. Winds from the SSW at 10 to 15 mph.

  • Friday

    Overcast. High of 52F. Breezy. Winds from the SW at 10 to 20 mph shifting to the WNW in the afternoon.

  • Friday Night

    Partly cloudy. Low of 25F with a windchill as low as 14F. Breezy. Winds from the WNW at 15 to 20 mph.

  • Saturday

    Clear. High of 41F. Breezy. Winds from the WNW at 15 to 20 mph.

  • Saturday Night

    Clear. Low of 28F with a windchill as low as 19F. Winds from the SW at 5 to 15 mph.

  • Sunday

    Partly cloudy. High of 45F. Breezy. Winds from the SSW at 15 to 25 mph.

  • Sunday Night

    Overcast. Low of 21F. Breezy. Winds from the SW at 10 to 20 mph.

  • Monday

    Overcast with a chance of snow. Fog early. High of 28F. Winds from the NW at 5 to 15 mph. Chance of snow 20%.

  • Monday Night

    Partly cloudy. Low of 18F. Winds from the NW at 5 to 10 mph.

  • Tuesday

    Clear. High of 25F with a windchill as low as 9F. Winds from the WNW at 5 to 10 mph.

  • Tuesday Night

    Clear. Low of 14F with a windchill as low as 5F. Winds from the WNW at 5 to 10 mph.

  • Wednesday

    Clear. High of 23F with a windchill as low as 5F. Winds from the West at 5 to 10 mph.

  • Wednesday Night

    Clear. Low of 14F. Winds less than 5 mph.

  • Thursday

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

  • Thursday Night

    Clear. Low of 14F. Winds less than 5 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Herculaneum, Mott Street, Herculaneum, MO

Updated: 12:50 AM CST

Temperature: 41.4 °F Dew Point: - Humidity: - Wind: North at - Pressure: 29.49 in Hourly Precipitation: - Windchill: 41 °F Graphs

Location: APRSWXNET Pevely MO US, Pevely, MO

Updated: 12:27 AM CST

Temperature: 41 °F Dew Point: 35 °F Humidity: 79% Wind: SSE at 1 mph Pressure: 29.89 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: MesoWest MAEYS1 IL US UPR, Maeystown, IL

Updated: 11:40 PM CST

Temperature: 35 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Windchill: 35 °F Graphs

Location: On The Bluffs, Waterloo, IL

Updated: 12:58 AM CST

Temperature: 39.9 °F Dew Point: 32 °F Humidity: 74% Wind: South at 3.0 mph Pressure: 29.82 in Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: summerfield, Imperial, MO

Updated: 12:58 AM CST

Temperature: 41.4 °F Dew Point: 28 °F Humidity: 58% Wind: Calm Pressure: 29.65 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: APRSWXNET Arnold MO US, Sulphur Springs, MO

Updated: 12:32 AM CST

Temperature: 41 °F Dew Point: 34 °F Humidity: 75% Wind: Calm Pressure: 29.88 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: Guardian Court, Arnold, MO

Updated: 12:56 AM CST

Temperature: 42.3 °F Dew Point: 35 °F Humidity: 75% Wind: North at - Pressure: 29.87 in Hourly Precipitation: - Windchill: 42 °F Graphs

Location: Chesapeake on the Bluff, Columbia, IL

Updated: 12:58 AM CST

Temperature: 40.8 °F Dew Point: 32 °F Humidity: 70% Wind: ENE at 3.8 mph Pressure: 29.27 in Hourly Precipitation: 0.00 in Windchill: 38 °F Graphs

Location: Wynfield Terrace, St. Louis, MO

Updated: 12:58 AM CST

Temperature: 40.1 °F Dew Point: 30 °F Humidity: 66% Wind: SE at 1.3 mph Pressure: 29.91 in Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: Arnold, MO

Updated: 12:46 AM CST

Temperature: 41.0 °F Dew Point: 35 °F Humidity: 80% Wind: Calm Pressure: 29.88 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: Arnold, Arnold, MO

Updated: 12:47 AM CST

Temperature: 41.1 °F Dew Point: 34 °F Humidity: 75% Wind: SE at 1.0 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: ARNOLD, Arnold, MO

Updated: 12:50 AM CST

Temperature: 40.8 °F Dew Point: - Humidity: 68% Wind: North at - Pressure: 29.21 in Hourly Precipitation: - Windchill: 41 °F Graphs

Location: Oakville, Cliffwood Trail, Oakville, MO

Updated: 12:58 AM CST

Temperature: 41.4 °F Dew Point: 30 °F Humidity: 65% Wind: ESE at 2.0 mph Pressure: 30.00 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: Christopher Winds, Oakville, MO

Updated: 12:58 AM CST

Temperature: 40.8 °F Dew Point: 34 °F Humidity: 77% Wind: SSE at 2.0 mph Pressure: 29.88 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: Rock Creek Terrace, High Ridge, MO

Updated: 12:58 AM CST

Temperature: 39.4 °F Dew Point: 33 °F Humidity: 79% Wind: ENE at 1.0 mph Pressure: 29.82 in Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

Location: Hardy Acres / AA9UC, Waterloo, IL

Updated: 12:54 AM CST

Temperature: 39.7 °F Dew Point: 31 °F Humidity: 71% Wind: ESE at 3.4 mph Pressure: 30.00 in Hourly Precipitation: 0.00 in Windchill: 38 °F Graphs

Location: Oakville, Cardinal Creek Subd, Oakville, MO

Updated: 12:58 AM CST

Temperature: 40.6 °F Dew Point: 34 °F Humidity: 78% Wind: SE at 3.0 mph Pressure: 29.89 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: Saint Louis County, Saint Louis County, MO

Updated: 12:55 AM CST

Temperature: 41.6 °F Dew Point: 34 °F Humidity: 74% Wind: ESE at 1.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Windchill: 42 °F Graphs

Location: Ste Genevieve county, Festus, MO

Updated: 12:56 AM CST

Temperature: 40.3 °F Dew Point: - Humidity: - Wind: North at - Pressure: - Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: Oakville, Providence Pointe, Oakville, MO

Updated: 12:58 AM CST

Temperature: 41.1 °F Dew Point: 33 °F Humidity: 74% Wind: East at 4.0 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

Location: Olde Mill Estates, Byrnes Mill, MO

Updated: 12:58 AM CST

Temperature: 42.1 °F Dew Point: 32 °F Humidity: 66% Wind: South at 8.3 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Windchill: 37 °F Graphs

Location: Devall's Backyard, Waterloo, IL

Updated: 11:33 PM CST

Temperature: 42.6 °F Dew Point: 33 °F Humidity: 69% Wind: North at 3.4 mph Pressure: 29.95 in Hourly Precipitation: - Windchill: 41 °F Graphs

Location: High Ridge Fire District House #1, High Ridge, MO

Updated: 12:53 AM CST

Temperature: 43.0 °F Dew Point: 35 °F Humidity: 74% Wind: SSE at 20.0 mph Pressure: 29.87 in Hourly Precipitation: 0.00 in Windchill: 34 °F Graphs

Location: Gedern Village, Columbia, IL

Updated: 12:57 AM CST

Temperature: 41.2 °F Dew Point: 34 °F Humidity: 77% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: Jefferson Barracks, Mehlville, MO

Updated: 12:58 AM CST

Temperature: 40.6 °F Dew Point: 32 °F Humidity: 72% Wind: ESE at 3.2 mph Pressure: 29.93 in Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

Location: San Luis Trails, Fenton, MO

Updated: 12:58 AM CST

Temperature: 40.3 °F Dew Point: 32 °F Humidity: 71% Wind: SE at 2.0 mph Pressure: 29.83 in Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: Hawkins/Smizer Mill, Fenton, MO

Updated: 12:58 AM CST

Temperature: 41.1 °F Dew Point: 34 °F Humidity: 77% Wind: Calm Pressure: 29.88 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: St. Joseph Hill, Pacific, MO

Updated: 12:56 AM CST

Temperature: 42.4 °F Dew Point: 35 °F Humidity: 76% Wind: ESE at 4.0 mph Pressure: 29.84 in Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: St. Louis, MO

Updated: 12:58 AM CST

Temperature: 41.5 °F Dew Point: 34 °F Humidity: 75% Wind: Calm Pressure: 29.80 in Hourly Precipitation: 0.00 in Windchill: 42 °F Graphs

Location: Gerry's Pool, Prairie Du Rocher, IL

Updated: 12:58 AM CST

Temperature: 40.3 °F Dew Point: 36 °F Humidity: 84% Wind: Calm Pressure: 29.79 in Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: South County, Affton, MO

Updated: 12:58 AM CST

Temperature: 41.1 °F Dew Point: 34 °F Humidity: 77% Wind: SE at 2.0 mph Pressure: 29.79 in Hourly Precipitation: 0.00 in Windchill: 41 °F Graphs

Location: BROADWAY (South), St. Louis, MO

Updated: 12:50 AM CST

Temperature: 41.4 °F Dew Point: - Humidity: 67% Wind: North at - Pressure: 29.31 in Hourly Precipitation: - Windchill: 41 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion...updated aviation 
National Weather Service St Louis MO 
1113 PM CST sun Dec 21 2014 


Update: 
issued at 925 PM CST sun Dec 21 2014 


Cloudy skies have moved into all but the far eastern part of the 
County Warning Area at this hour. Latest trends suggests that this area will cloud 
over within the hour, so expect the entire area to return to being 
cloudy the rest of the night. With clouds and a bit higher winds, 
do not expect temperatures to fall more than a few degrees tonight, 
so raised going temperatures a bit in a few areas. Expanded the 
slight chances for light rain eastward late tonight across eastern 
Missouri as low level moisture convergence will increase ahead of 
weak shortwave trough that is rounding base of trough currently 
over the Southern Plains. 


Britt 


&& 


Short term: (through late tonight) 
issued at 334 PM CST sun Dec 21 2014 


Low level moisture will be on the increase late tonight ahead of 
next weather system, but rain will not move into central and 
northeast Missouri, west central Illinois til after midnight. 
Otherwise, cloudy conditions to persist with low temperatures only 
in the low 30s over far eastern sections to around 40 over central 
Missouri, so do not need to worry about any freezing or frozen 
precipitation. 


Byrd 


Long term: (monday through next sunday) 
issued at 334 PM CST sun Dec 21 2014 


(monday - wednesday) 


All guidance based off of the 21/12z model cycle still giving strong 
support to going forecast trends that indicate a rainy Monday is in 
the offing for most of the County Warning Area. Upper trof over the central Continental U.S. 
Will be deepening over the next 12 hours as several shortwaves work 
into the mean trof position, with the strongest of these pushing 
into the mid MO valley on Monday morning and closing off into an 
upper low over Iowa by Monday afternoon and evening. As this system 
approaches late tonight and early Monday, southerly flow will 
increase through the lower troposphere leading to a significant 
deepening of the moisture over the region. Ascent from the 
approaching upper level dynamics combined with the low level 
isentropic ascent should produce a fairly rapid increase of rainfall 
across most of the area during the morning hours, with this rain 
continuing over much forecast area into the afternoon. 


Dry slot will be wrapping into the system Monday night as the system 
occludes, with model consensus of the translation of the dry slot 
suggesting that rainfall will be diminishing from northwest to southeast across 
the County Warning Area on Monday night. By 12z Tuesday, relatively dry air will be 
over northwest sections of the cwa, while on the se fringes of the dry 
slot deep moisture and baroclinicity will draped from Arkansas into the 
lower Ohio Valley. Will carry a chance of precip over about the 
southeast 2/3 of the County Warning Area on Tuesday, with highest pops over southeast sections 
of the forecast area closer to the aforementioned moisture and baroclinic zone. 


This leads into a very tricky forecast heading into midweek, as 
longwave trof lingers over the Continental U.S.. this is one of the trickier 
patterns of the winter season, as models often struggle with speed 
and intensity of shortwaves that are meandering through the trof. 
And in this case, forecast concerns are amplified due to the fact 
that strong low level baroclinicity and deep moisture...two key 
ingredients for strong synoptic scale winter systems...will be 
lurking just off to our southeast. Models have already been struggling 
with the evolution of this pattern... last nights 00z GFS and off- 
cycle 06z NAM runs hinted at low closing off to our south with 
accumulating snow for a large part of our fa, but 12z runs are 
less bullish on this forecast, and suggest more of an open system 
that will produce heavier precip in the warmer air over parts of 
the Ohio Valley and areas east. 


In this pattern, odds are extremely high that individual solutions 
will continue to flip-flop on exact trends, so at this juncture feel 
most comfortable leaning on model consensus for the large scale 
forecast details. 


In general, the weather on Tuesday night and Christmas eve day 
should become a bit more unsettled as another shortwave enters 
the base of the longwave trof and the entire system begins to push 
east. This should certainly generate another wave of precip, but 
the big question is where. GFS remains the most robust model in 
regards to precip during this time, with measurable quantitative precipitation forecast over about 
the eastern half of the cwa, while all the other solutions focus 
this axis from extreme E Arkansas into Kentucky and Tennessee. Forecast soundings 
indicate the low level air mass over our southeast counties (where the quantitative precipitation forecast 
would be heaviest) will be too warm for any frozen precip Tuesday 
night, but may cool off enough to support some snow during the day 
on Wednesday as the precip winds down. Thermal profile looks more 
favorable for snow over our northwest counties, but here the precip 
should be quite light. 


At this point, accumulating snow in any part of our County Warning Area look 
iffy. But once again this is a tricky pattern...so Holiday 
travelers should continue to monitor the latest forecasts. 


(Christmas day - sunday) 


It now appears that Christmas day will be fairly tranquil and 
relatively mild as upper trof pushes east and ridging temporarily 
allows warmer air to build into the central Continental U.S.. 


Medium range consensus remains fairly good into Friday, as a lead 
shortwave begins the process of developing another trof axis over 
the central Continental U.S.. have maintained some slight chance pops as the 
shortwave pushes through the region. 


Although medium range models diverge heading into next weekend 
with the location and intensity of the upper level trof, lowering 
of heights should yield below normal temps. 


Truett 


&& 


Aviation: (for the 06z tafs through 06z Monday night) 
issued at 1103 PM CST sun Dec 21 2014 


Focus continues to system to impact the region on Mon. Latest 
guidance, while not having a great handle on current conditions, 
continues to suggest prev tafs are on track. Believe conditions 
will deteriorate shortly after sunrise Mon. Cigs shud lower to low 
end MVFR as well as visbys reduced into MVFR range due to either 
ra, br or both. Latest indications suggest rain may have a more rain showers 
component, but during dry periods, while brief, visbys shud still 
be reduced due to br. Have low confidence on visbys on Mon and may 
drop to IFR at times. Confidence in IFR at sus/cps remains low and 
will keep trends going for now. Winds will veer to eventually swly 
Mon evening with visbys and cigs improving with this wind shift. 


Specifics for kstl: VFR and dry expected thru the overnight hours 
with conditions deteriorating shortly after sunrise. Confidence in 
IFR conditions is still too low and will therefore keep sct cloud 
deck mentioned for now. Conditions will improve Mon late 
afternoon or evening as winds become swly. 


Tilly 


&& 


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


$$ 


Weather forecast office lsx 



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