Herculaneum, Missouri Weather Conditions

Severe Weather Alerts

National Weather Service:

Winter Weather Advisory View All Alerts

Your Weather

To update your location please enter your ZIP code, city, state, airport code or country in the field below. Weather by E-mail: Forecast storm alerts. Weather E-Mail Alert Sign Up »

Current Conditions

  • 41°
  • Light Rain
  • Wind: North 7 mph
  • Humidity: 89%
  • Visibility: 7.0 miles
  • Dew Point: 38°
  • Pressure: 29.92 in. 0
  • Heat Index: 36

Select a Section

Click a section below for more information.

Next 12 Hours

11  pm
2  am
5  am
8  am
11  am
Rain
Rain
Ice Pellets
Ice Pellets
Snow Showers
Snow Showers
Snow Showers
Snow Showers
Snow Showers
Snow Showers
38°
32°
28°
22°
22°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Wednesday
  • Snow Showers
  • High: 24 °
  • Low: 11 °
  • Snow Showers
  • Thursday
  • Clear
  • High: 26 °
  • Low: 8 °
  • Clear
  • Friday
  • Clear
  • High: 41 °
  • Low: 24 °
  • Clear
  • Saturday
  • Clear
  • High: 55 °
  • Low: 28 °
  • Clear
  • Sunday
  • Clear
  • High: 55 °
  • Low: 33 °
  • Clear

Forecast for Herculaneum, Missouri

Updated: 7:14 PM CST on January 03, 2015

Winter Weather Advisory in effect from midnight tonight to 6 PM CST Wednesday...
  • Tuesday

    Rain changing to a wintry mix late. Lows overnight in the mid 20s.

  • Tuesday Night

    Rain in the evening will transition to a wintry mix overnight. Low 24F. Winds NNW at 10 to 20 mph. Chance of precip 100%.

  • Wednesday

    Variable clouds with snow showers. High 24F. Winds N at 10 to 20 mph. Chance of snow 60%.

  • Wednesday Night

    Cloudy. A few flurries are possible. Low 11F. Winds N at 10 to 15 mph.

  • Thursday

    Sunny skies. High 26F. Winds NNW at 10 to 15 mph.

  • Thursday Night

    Clear. Low 8F. Winds ESE at 5 to 10 mph.

  • Friday

    Sunny. High 41F. Winds S at 10 to 15 mph.

  • Friday Night

    Clear skies. Low 24F. Winds SSW at 10 to 15 mph.

  • Saturday

    Sunny skies. High near 55F. Winds W at 10 to 15 mph.

  • Saturday Night

    A mostly clear sky. Low 28F. Winds W at 5 to 10 mph.

  • Sunday

    Sunny. High around 55F. Winds SSW at 5 to 10 mph.

  • Sunday Night

    A mostly clear sky. Low 33F. Winds SW at 5 to 10 mph.

  • Monday

    Mainly sunny. High 53F. Winds SW at 5 to 10 mph.

  • Monday Night

    Clear. Low 33F. Winds S at 5 to 10 mph.

  • Tuesday

    Mainly sunny. High 61F. Winds SSW at 10 to 15 mph.

  • Tuesday Night

    Clear skies. Low 38F. Winds SSW at 5 to 10 mph.

  • Wednesday

    Sunny. High 64F. Winds SSE at 5 to 10 mph.

  • Wednesday Night

    Mostly clear. Low 39F. Winds ESE at 5 to 10 mph.

  • Thursday

    Mostly sunny skies. High 61F. Winds E at 10 to 15 mph.

  • Thursday Night

    Considerable cloudiness. Low near 40F. Winds E at 5 to 10 mph.

  • Friday

    Mostly cloudy skies early, then partly cloudy in the afternoon. High 58F. Winds ESE at 10 to 15 mph.

  • Friday Night

    Becoming cloudy with occasional light rain after midnight. Low 43F. Winds ESE at 5 to 10 mph. Chance of rain 60%.

Severe Weather Alert Descriptions

 Winter Weather Advisory  Statement as of 4:12 PM CST on March 3, 2015


... Winter Weather Advisory in effect from midnight tonight to
6 PM CST Wednesday...

The National Weather Service in St Louis has issued a Winter
Weather Advisory for snow... sleet... and freezing rain... which is
in effect from midnight tonight to 6 PM CST Wednesday.

* Timing... rain will becoming mixed with sleet and freezing rain
after midnight tonight... with this icy mix change to all snow
early Wednesday.

* Accumulations... snow accumulation of 2 to 4 inches... along
with a light glazing of ice.

* Winds... north 10 to 15 mph with gusts up to 20 mph.

* Impacts... the wintry precipitation will result in hazardous
travel conditions... especially on bridges... overpasses... and
untreated roads. Parking lots and sidewalks will become
slippery as well.

Precautionary/preparedness actions...

A Winter Weather Advisory is issued for a variety of winter
weather conditions... such as snow... blowing snow... sleet... or
freezing drizzle and rain. It only takes a small amount of wintry
precipitation to make roads... bridges... sidewalks... and parking
lots icy and dangerous. It is often difficult to tell when ice
begins to form... so do not be caught off guard.






Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Herculaneum, Mott Street, Herculaneum, MO

Updated: 9:50 PM CST

Temperature: 41.4 °F Dew Point: - Humidity: - Wind: North at - Pressure: 29.47 in Hourly Precipitation: - Windchill: 41 °F Graphs

Location: APRSWXNET Pevely MO US, Pevely, MO

Updated: 9:46 PM CST

Temperature: 39 °F Dew Point: 38 °F Humidity: 98% Wind: Calm Pressure: 29.90 in Hourly Precipitation: 0.01 in Windchill: 39 °F Graphs

Location: Upper Moss Hollow Road, Barnhart, MO

Updated: 10:12 PM CST

Temperature: 43.5 °F Dew Point: 36 °F Humidity: 76% Wind: North at - Pressure: 29.29 in Hourly Precipitation: - Windchill: 44 °F Graphs

Location: MesoWest MAEYS1 IL US UPR, Maeystown, IL

Updated: 7:00 PM CST

Temperature: 37 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Windchill: 37 °F Graphs

Location: APRSWXNET Imperial MO US, Imperial, MO

Updated: 9:44 PM CST

Temperature: 42 °F Dew Point: 40 °F Humidity: 93% Wind: Calm Pressure: 29.90 in Hourly Precipitation: 0.02 in Windchill: 42 °F Graphs

Location: On The Bluffs, Waterloo, IL

Updated: 10:16 PM CST

Temperature: 39.6 °F Dew Point: 39 °F Humidity: 96% Wind: Calm Pressure: 29.82 in Hourly Precipitation: 0.04 in Windchill: 40 °F Graphs

Location: summerfield, Imperial, MO

Updated: 10:16 PM CST

Temperature: 39.7 °F Dew Point: 34 °F Humidity: 81% Wind: Calm Pressure: 29.68 in Hourly Precipitation: 0.07 in Windchill: 40 °F Graphs

Location: APRSWXNET Arnold MO US, Sulphur Springs, MO

Updated: 9:50 PM CST

Temperature: 40 °F Dew Point: 38 °F Humidity: 93% Wind: NW at 1 mph Pressure: 29.87 in Hourly Precipitation: 0.02 in Windchill: 40 °F Graphs

Location: Hillsboro, Missouri, Hillsboro, MO

Updated: 10:13 PM CST

Temperature: 39.7 °F Dew Point: 38 °F Humidity: 94% Wind: Calm Pressure: 29.70 in Hourly Precipitation: - Windchill: 40 °F Graphs

Location: MesoWest WARNK1 IL US UPR, Columbia, IL

Updated: 9:00 PM CST

Temperature: 40 °F Dew Point: - Humidity: - Wind: North at 255 mph Pressure: - Hourly Precipitation: 0.00 in Windchill: 15 °F Graphs

Location: MesoWest HLCRST MO US UPR, Saint Louis, MO

Updated: 9:00 PM CST

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

Location: Guardian Court, Arnold, MO

Updated: 10:17 PM CST

Temperature: 41.5 °F Dew Point: 37 °F Humidity: 83% Wind: North at - Pressure: 29.88 in Hourly Precipitation: - Windchill: 42 °F Graphs

Location: Arrowhead STL County, Saint Louis, MO

Updated: 10:08 PM CST

Temperature: 40.1 °F Dew Point: 38 °F Humidity: 92% Wind: Calm Pressure: 30.00 in Hourly Precipitation: - Windchill: 40 °F Graphs

Location: Chesapeake on the Bluff, Columbia, IL

Updated: 10:16 PM CST

Temperature: 39.7 °F Dew Point: 39 °F Humidity: 98% Wind: North at 2.9 mph Pressure: 29.27 in Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: Arnold # 1, Arnold, MO

Updated: 10:06 PM CST

Temperature: 39.6 °F Dew Point: 39 °F Humidity: 99% Wind: NNE at 2.7 mph Pressure: 29.96 in Hourly Precipitation: - Windchill: 40 °F Graphs

Location: Rosewood Korner, Waterloo, IL

Updated: 10:16 PM CST

Temperature: 39.0 °F Dew Point: 38 °F Humidity: 98% Wind: NNE at 2.7 mph Pressure: 29.22 in Hourly Precipitation: 0.03 in Windchill: 39 °F Graphs

Location: Wynfield Terrace, St. Louis, MO

Updated: 10:16 PM CST

Temperature: 39.2 °F Dew Point: 38 °F Humidity: 96% Wind: NNW at 1.6 mph Pressure: 29.91 in Hourly Precipitation: 0.04 in Windchill: 39 °F Graphs

Location: Arnold, MO

Updated: 10:03 PM CST

Temperature: 39.6 °F Dew Point: 39 °F Humidity: 96% Wind: Calm Pressure: 29.90 in Hourly Precipitation: 0.02 in Windchill: 40 °F Graphs

Location: Arnold, Arnold, MO

Updated: 10:16 PM CST

Temperature: 39.8 °F Dew Point: 38 °F Humidity: 93% Wind: NW at 1.0 mph Pressure: 29.91 in Hourly Precipitation: 0.03 in Windchill: 40 °F Graphs

Location: ARNOLD, Arnold, MO

Updated: 10:10 PM CST

Temperature: 39.2 °F Dew Point: - Humidity: 92% Wind: North at - Pressure: 29.25 in Hourly Precipitation: - Windchill: 39 °F Graphs

Location: Oakville, Cliffwood Trail, Oakville, MO

Updated: 10:17 PM CST

Temperature: 39.4 °F Dew Point: 39 °F Humidity: 98% Wind: NE at 1.3 mph Pressure: 30.00 in Hourly Precipitation: 0.05 in Windchill: 39 °F Graphs

Location: APRSWXNET Cedar Hill MO US, Cedar Hill, MO

Updated: 9:41 PM CST

Temperature: 40 °F Dew Point: 38 °F Humidity: 93% Wind: Calm Pressure: 29.93 in Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: Christopher Winds, Oakville, MO

Updated: 10:16 PM CST

Temperature: 40.1 °F Dew Point: 39 °F Humidity: 95% Wind: NNW at 2.0 mph Pressure: 29.91 in Hourly Precipitation: 0.02 in Windchill: 40 °F Graphs

Location: Rock Creek Terrace, High Ridge, MO

Updated: 10:16 PM CST

Temperature: 37.7 °F Dew Point: 36 °F Humidity: 95% Wind: Calm Pressure: 29.86 in Hourly Precipitation: 0.02 in Windchill: 38 °F Graphs

Location: Hardy Acres / AA9UC, Waterloo, IL

Updated: 10:16 PM CST

Temperature: 37.9 °F Dew Point: 37 °F Humidity: 98% Wind: Calm Pressure: 29.97 in Hourly Precipitation: 0.00 in Windchill: 38 °F Graphs

Location: Oakville, Cardinal Creek Subd, Oakville, MO

Updated: 10:17 PM CST

Temperature: 38.8 °F Dew Point: 38 °F Humidity: 97% Wind: North at 1.0 mph Pressure: 29.92 in Hourly Precipitation: 0.03 in Windchill: 39 °F Graphs

Location: Saint Louis County, Saint Louis County, MO

Updated: 10:15 PM CST

Temperature: 39.3 °F Dew Point: 38 °F Humidity: 96% Wind: Calm Pressure: 29.97 in Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

Location: Ste Genevieve county, Festus, MO

Updated: 10:16 PM CST

Temperature: 39.4 °F Dew Point: - Humidity: - Wind: North at - Pressure: - Hourly Precipitation: 0.00 in Windchill: 39 °F Graphs

Location: Oakville, Providence Pointe, Oakville, MO

Updated: 10:17 PM CST

Temperature: 39.8 °F Dew Point: 38 °F Humidity: 94% Wind: Calm Pressure: 29.97 in Hourly Precipitation: 0.02 in Windchill: 40 °F Graphs

Location: Olde Mill Estates, Byrnes Mill, MO

Updated: 10:17 PM CST

Temperature: 39.6 °F Dew Point: 39 °F Humidity: 97% Wind: East at 2.2 mph Pressure: 29.99 in Hourly Precipitation: 0.01 in Windchill: 40 °F Graphs

Location: Cathedral Drive, Saint Louis, MO

Updated: 10:12 PM CST

Temperature: 40.1 °F Dew Point: 39 °F Humidity: 96% Wind: North at - Pressure: 29.97 in Hourly Precipitation: 0.00 in Windchill: 40 °F Graphs

Location: Devall's Backyard, Waterloo, IL

Updated: 10:12 PM CST

Temperature: 41.3 °F Dew Point: 40 °F Humidity: 95% Wind: Calm Pressure: 29.90 in Hourly Precipitation: - Windchill: 41 °F Graphs

Location: Brookton Oaks Drive, Cedar Hill, MO

Updated: 10:12 PM CST

Temperature: 40.8 °F Dew Point: 39 °F Humidity: 93% Wind: North at - Pressure: 29.79 in Hourly Precipitation: - Windchill: 41 °F Graphs

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

Updated: 10:05 PM CST

Temperature: 41.1 °F Dew Point: 39 °F Humidity: 93% Wind: NNW at 1.0 mph Pressure: 29.90 in Hourly Precipitation: 0.01 in Windchill: 41 °F Graphs

Location: Gedern Village, Columbia, IL

Updated: 10:17 PM CST

Temperature: 40.3 °F Dew Point: 39 °F Humidity: 95% Wind: Calm Pressure: 29.95 in Hourly Precipitation: 0.03 in Windchill: 40 °F Graphs

Location: APRSWXNET Milstadt IL US, Waterloo, IL

Updated: 9:46 PM CST

Temperature: 38 °F Dew Point: 36 °F Humidity: 94% Wind: Calm Pressure: 29.85 in Hourly Precipitation: 0.00 in Windchill: 38 °F Graphs

Location: Deerpath Acres Court, Saint Louis, MO

Updated: 10:17 PM CST

Temperature: 38.3 °F Dew Point: 37 °F Humidity: 96% Wind: North at - Pressure: 29.92 in Hourly Precipitation: - Windchill: 38 °F Graphs

Location: Jefferson Barracks, Mehlville, MO

Updated: 10:17 PM CST

Temperature: 39.7 °F Dew Point: 39 °F Humidity: 98% Wind: North at 1.5 mph Pressure: 29.91 in Hourly Precipitation: 0.03 in Windchill: 40 °F Graphs

Location: San Luis Trails, Fenton, MO

Updated: 10:17 PM CST

Temperature: 39.3 °F Dew Point: 37 °F Humidity: 90% Wind: North at 2.0 mph Pressure: 29.85 in Hourly Precipitation: 0.00 in Windchill: 39 °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 
609 PM CST Tue Mar 3 2015 


Short term: (late tonight through Wednesday evening) 
issued at 405 PM CST Tue Mar 3 2015 


12z guidance depicts no major changes in expected weather trends 
across the area. The next round of cold air is just now entering 
the extreme northwest counties of our cwa, and will attempt to 
undercut the bands of rain that continue to develop near the Kansas/OK 
border and advected east-northeast into the mid-Mississippi Valley. 


The cold air will become deep enough to begin a transition of the 
rain to sleet and perhaps freezing rain as the night progresses, 
but as the cold air becomes deep enough to create a mix from 
central MO into central Illinois it appears that the precipitation will 
be winding down. However, it should be a different story a bit 
further south late tonight and into Wednesday morning, where the 
precipitation will be more sustained as the cold air reaches 
critical depths. Overall, the general trend overnight across the 
southeast half of the County Warning Area should be for the rain to first become 
mixed with sleet and freezing rain as the night progresses. The 
continued southward progression of the cold air will then change 
this icy mix over to all snow near the I-44 corridor early 
Wednesday, with the precip in our far southern counties changing 
over to all snow no later than midday, and then winding down 
Wednesday evening. 


The precipitation late tonight and into Wednesday has a lot going 
for it. This mornings upper air data indicated 10c 850mb dewpoints 
already into SW MO, and this moisture will increase into 
Wednesday as the SW low level flow just above the cold air 
continues the moisture transport. Lift generated by already strong 
isentropic ascent will be increasing as baroclinicity strengthens 
to our south, with the southwest flow aloft ejecting several 
shortwaves into the mid Mississippi Valley enhancing the deep 
lift further. Believe the intensity of the lift is showing up in 
most of the synoptic models as they all have some indication of 
the upper level jet over the upper Great Lakes backbuilding into 
our area with time. 


Quantitative precipitation forecast and thermal profiles suggest heavy wintry precipitation is 
likely from Arkansas into southern MO and southern Illinois. Snowfall 
generated from these parameters indicate 4 to 6 inches of snow/sleet can 
be expected over our far southern counties, and because of this 
snowfall along with the light glazing produced by the freezing 
rain will be going out with a Winter Storm Warning for late 
tonight into Wednesday evening for areas along and south of a 
Centerville...Sparta line. Just north of the warning area will be 
a Winter Weather Advisory from the Eastern Ozarks into southern 
Illinois, for lesser snowfalls of 2 to 4 inches along with a 
possible glaze of ice. 


It should be noted that there will be an extremely tight gradient 
on the northern edges of the snowfall...roughtly from near 
Jefferson City...through St. Louis...to around Vandalia Illinois. If the 
system shifts slightly north the advisory may need to be expanded 
into these areas...this evenings and overnight shifts will be 
monitoring upstream radar trends to fine tune this tight snowfall gradient. 


Ah Spring... 


Truett 


Long term: (thursday through next tuesday) 
issued at 320 PM CST Tue Mar 3 2015 


As upper level long wave trof pushes east, the Arctic air that 
enters the region overnight tonight will continue to build and 
strengthen over the mid Mississippi Valley. Although the high will 
mean few clouds and dry weather, temperatures of this airmass will 
be extremely cold for early March. Currently, we are looking for 
Thursday morning lows somewhere in the 5 to 12 above range, with 
highs only rebounding into the 20s during the afternoon even with 
what should be strong sunshine. 


Unseasonably cold temperatures will linger on Thursday night, but 
return flow should mean the beginnings of a welcomed warmup by Friday. 


A split flow regime will initially be in place at the start of the 
extended range period featuring a broad longwave trof centered 
across eastern noam and a quasi Rex block along the West Coast. The 
Block will break down by early next week and the overall strength of 
the trof weakens, however we largely maintain northwest flow aloft 
into Monday. There will be several notable disturbances embedded 
within the flow aloft which will traverse the region, bringing a 
cold front through the area on Saturday afternoon/night and then 
again on Sunday night. Present indications are that cooling 
associated with these fronts will be weak and short-lived. In 
general the weekend will be characterized by near average 
temperatures and benign/tranquil weather conditions. Next week will 
feature a pronounced pattern change, rising heights aloft and above 
average temperatures for much of the week. 


Truett/glass 


&& 


Aviation: (for the 00z tafs through 00z Wednesday evening) 
issued at 546 PM CST Tue Mar 3 2015 


MVFR ceilings will last through much of the night at all taf 
sites as cold front pushes through and stratus deck remains. KUIN 
and kcou will likely be VFR by 10-13z Wednesday, then VFR ceilings 
reach kstl taf sites by around 16z. Will have to watch radar and 
surface reports carefully this evening as there is some chance 
that precip aloft now seen on regional radars may reach the surface at 
kstl area taf sites. For now, it appears a dry layer at 6k to 8k 
feet may keep this from happening so have left tafs dry. Northwest 
winds behind the front will become gusty and last into Wednesday. 


Specifics for kstl: MVFR ceilings expected until 16z. Cold front 
should reach taf site by around 06z, and north winds behind the 
cold front will increase to around 14 knots and become gusty. 
Have kept taf dry for now, but will have to watch surface reports 
to see if precip aloft now seen on radar begins reaching the 
ground this evening. Expect dry air aloft to keep most precip just 
to the south of kstl on Wednesday, but it is a close call. 


Browning 


&& 


Lsx watches/warnings/advisories: 
MO...Winter Weather Advisory from midnight tonight to 6 PM CST 
Wednesday for Crawford MO-Jefferson MO-Washington MO. 


Winter Storm Warning from 3 am Wednesday to midnight CST 
Wednesday night for Iron MO-Madison MO-Reynolds MO-St. 
Francois MO-Ste. Genevieve MO. 


Illinois...Winter Weather Advisory from midnight tonight to 6 PM CST 
Wednesday for Clinton Illinois-Marion Illinois-Monroe IL-St. Clair Illinois- 
Washington Illinois. 


Winter Storm Warning from 3 am Wednesday to midnight CST 
Wednesday night for Randolph Illinois. 


&& 


$$ 


Weather forecast office lsx 












National Weather Service Glossary of Abbreviations

Non-Expanded Version (with abbreviations)

Powered by the Weather Underground, Inc.