Arnold, Missouri Weather Conditions

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Current Conditions

  • 26°
  • Snow
  • Wind: SE 5 mph
  • Humidity: 88%
  • Visibility: 0.5 miles
  • Dew Point: 23°
  • Pressure: 30.52 in. -
  • Heat Index: 20

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Next 12 Hours

6  pm
9  pm
12  am
3  am
6  am
Snow
Snow
Snow
Snow
Snow
Snow
Snow
Snow
Ice Pellets
Ice Pellets
27°
30°
28°
30°
32°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Saturday
  • Snow
  • High: 32 °
  • Low: 27 °
  • Snow
  • Sunday
  • Ice Pellets
  • High: 39 °
  • Low: 21 °
  • Ice Pellets
  • Monday
  • Rain
  • High: 41 °
  • Low: 28 °
  • Rain
  • Tuesday
  • Chance of a Thunderstorm
  • High: 54 °
  • Low: 16 °
  • Chance of T-Storms
  • Wednesday
  • Partly Cloudy
  • High: 28 °
  • Low: 7 °
  • Partly Cloudy

Forecast for Arnold, Missouri

Updated: 3:00 PM CST on February 28, 2015

Winter Weather Advisory in effect until 6 PM CST Sunday...
  • Saturday

    Overcast with snow in the afternoon. High of 32F with a windchill as low as 3F. Winds from the ESE at 5 to 10 mph. Chance of snow 90%.

  • Saturday Night

    Overcast with snow. Low of 27F. Winds from the ESE at 5 to 10 mph. Chance of snow 100% with accumulations up to 5 in. possible.

  • Sunday

    Overcast with ice pellets and snow. Fog early. High of 39F. Winds less than 5 mph. Chance of precipitation 80% with accumulations up to 1 in. possible.

  • Sunday Night

    Overcast in the evening, then mostly cloudy. Low of 21F. Winds from the NW at 5 to 10 mph.

  • Monday

    Partly cloudy. High of 41F. Winds from the North at 5 to 10 mph shifting to the East in the afternoon. Chance of rain 20%.

  • Monday Night

    Overcast with snow, then a chance of snow after midnight. Low of 28F with a windchill as low as 18F. Winds from the SE at 10 to 15 mph. Chance of snow 50%.

  • Tuesday

    Overcast with a chance of a thunderstorm and rain. Fog early. High of 54F. Breezy. Winds from the South at 15 to 25 mph. Chance of rain 70% with rainfall amounts near 0.6 in. possible.

  • Tuesday Night

    Overcast with a chance of snow. Low of 16F. Breezy. Winds from the NW at 20 to 25 mph. Chance of snow 20%.

  • Wednesday

    Mostly cloudy. High of 28F with a windchill as low as -2F. Breezy. Winds from the NNW at 15 to 25 mph.

  • Wednesday Night

    Partly cloudy. Low of 7F with a windchill as low as 1F. Breezy. Winds from the NNW at 15 to 20 mph.

  • Thursday

    Clear. High of 36F with a windchill as low as -8F. Winds from the NNW at 10 to 15 mph.

  • Thursday Night

    Clear. Low of 23F with a windchill as low as 12F. Winds from the East at 5 to 15 mph shifting to the South after midnight.

  • Friday

    Clear. High of 46F. Breezy. Winds from the SSW at 15 to 20 mph.

  • Friday Night

    Clear. Low of 30F with a windchill as low as 21F. Winds from the SSW at 10 to 15 mph.

  • Saturday

    Clear. High of 45F. Breezy. Winds from the SW at 15 to 20 mph.

  • Saturday Night

    Clear. Fog overnight. Low of 27F with a windchill as low as 19F. Winds from the West at 10 to 15 mph shifting to the NNW after midnight.

  • Sunday

    Clear. High of 39F with a windchill as low as 19F. Winds from the SW at 5 to 15 mph.

  • Sunday Night

    Clear. Low of 32F. Winds from the South at 5 to 10 mph.

  • Monday

    Clear. High of 48F. Winds from the South at 5 to 10 mph.

  • Monday Night

    Clear. Low of 36F. Winds from the South at 5 to 10 mph.

  • Tuesday

    Clear. High of 52F. Winds less than 5 mph.

  • Tuesday Night

    Clear. Low of 37F. Winds less than 5 mph.

  • Wednesday

    Clear. High of 52F. Winds less than 5 mph.

  • Wednesday Night

    Clear. Low of 37F with a windchill as low as 27F. Winds from the SE at 5 to 10 mph.

Severe Weather Alert Descriptions

 Winter Weather Advisory  Statement as of 4:12 PM CST on February 28, 2015


... Winter Weather Advisory remains in effect until 6 PM CST
Sunday...

* timing... snow will continue this evening. There may be a lull in
the snowfall late this evening, but the snow is expected to
reintensify on Monday morning... especially along and north of
Interstate 70.

* Accumulations... snow accumulation of 4 to 6 inches... along
with a light glazing of ice.

* Winds... south 5 mph or less.

* 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 means that up to 5 inches of snow is
expected across the advisory area. Roads may rapidly become
slippery once the snow begins... so motorists should plan for a
slower than normal trip. Be especially alert when approaching
bridges... overpasses... and curves.






 Local Storm Report 



02/28/2015 0436 PM

Pevely, Jefferson County.

Snow m1.3 inch, reported by public.






02/28/2015 0340 PM

De Soto, Jefferson County.

Snow m1.0 inch, reported by public.





Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Guardian Court, Arnold, MO

Updated: 4:55 PM CST

Temperature: 28.6 °F Dew Point: 18 °F Humidity: 65% Wind: North at - Pressure: 30.44 in Hourly Precipitation: - Windchill: 29 °F Graphs

Location: Arnold # 1, Arnold, MO

Updated: 4:58 PM CST

Temperature: 24.6 °F Dew Point: 23 °F Humidity: 95% Wind: ESE at 4.7 mph Pressure: 30.51 in Hourly Precipitation: - Windchill: 19 °F Graphs

Location: Arnold, MO

Updated: 4:55 PM CST

Temperature: 25.2 °F Dew Point: 23 °F Humidity: 92% Wind: Calm Pressure: 30.49 in Hourly Precipitation: 0.00 in Windchill: 25 °F Graphs

Location: APRSWXNET Arnold MO US, Sulphur Springs, MO

Updated: 4:23 PM CST

Temperature: 25 °F Dew Point: 22 °F Humidity: 88% Wind: SSE at 1 mph Pressure: 30.48 in Hourly Precipitation: 0.00 in Windchill: 25 °F Graphs

Location: Arnold, Arnold, MO

Updated: 4:53 PM CST

Temperature: 24.9 °F Dew Point: 22 °F Humidity: 89% Wind: Calm Pressure: 30.48 in Hourly Precipitation: 0.00 in Windchill: 25 °F Graphs

Location: summerfield, Imperial, MO

Updated: 4:57 PM CST

Temperature: 25.7 °F Dew Point: 15 °F Humidity: 63% Wind: Calm Pressure: 30.23 in Hourly Precipitation: 0.00 in Windchill: 26 °F Graphs

Location: Wynfield Terrace, St. Louis, MO

Updated: 4:58 PM CST

Temperature: 26.6 °F Dew Point: 17 °F Humidity: 67% Wind: Calm Pressure: 30.47 in Hourly Precipitation: 0.00 in Windchill: 27 °F Graphs

Location: Saint Louis County, Saint Louis County, MO

Updated: 4:55 PM CST

Temperature: 25.5 °F Dew Point: 23 °F Humidity: 90% Wind: Calm Pressure: 30.54 in Hourly Precipitation: 0.00 in Windchill: 26 °F Graphs

Location: Arrowhead STL County, Saint Louis, MO

Updated: 4:54 PM CST

Temperature: 25.9 °F Dew Point: 22 °F Humidity: 86% Wind: ESE at 1.7 mph Pressure: 30.53 in Hourly Precipitation: - Windchill: 26 °F Graphs

Location: Oakville, Providence Pointe, Oakville, MO

Updated: 4:57 PM CST

Temperature: 24.9 °F Dew Point: 23 °F Humidity: 91% Wind: Calm Pressure: 30.54 in Hourly Precipitation: 0.00 in Windchill: 25 °F Graphs

Location: APRSWXNET Imperial MO US, Imperial, MO

Updated: 4:34 PM CST

Temperature: 27 °F Dew Point: 24 °F Humidity: 89% Wind: SSE at 1 mph Pressure: 30.48 in Hourly Precipitation: 0.00 in Windchill: 27 °F Graphs

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

Updated: 4:00 PM CST

Temperature: 25 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Windchill: 25 °F Graphs

Location: Oakville, Cliffwood Trail, Oakville, MO

Updated: 4:57 PM CST

Temperature: 27.1 °F Dew Point: 18 °F Humidity: 69% Wind: Calm Pressure: 30.53 in Hourly Precipitation: 0.00 in Windchill: 27 °F Graphs

Location: Oakville, Cardinal Creek Subd, Oakville, MO

Updated: 4:58 PM CST

Temperature: 25.1 °F Dew Point: 23 °F Humidity: 90% Wind: East at 3.0 mph Pressure: 30.50 in Hourly Precipitation: 0.00 in Windchill: 25 °F Graphs

Location: Christopher Winds, Oakville, MO

Updated: 4:58 PM CST

Temperature: 25.5 °F Dew Point: 23 °F Humidity: 91% Wind: ESE at 1.0 mph Pressure: 30.48 in Hourly Precipitation: 0.00 in Windchill: 26 °F Graphs

Location: Deerpath Acres Court, Saint Louis, MO

Updated: 4:55 PM CST

Temperature: 27.0 °F Dew Point: 23 °F Humidity: 84% Wind: North at - Pressure: 30.48 in Hourly Precipitation: - Windchill: 27 °F Graphs

Location: Cathedral Drive, Saint Louis, MO

Updated: 4:55 PM CST

Temperature: 25.9 °F Dew Point: 23 °F Humidity: 89% Wind: North at - Pressure: 30.54 in Hourly Precipitation: 0.00 in Windchill: 26 °F Graphs

Location: Rock Creek Terrace, High Ridge, MO

Updated: 4:58 PM CST

Temperature: 22.8 °F Dew Point: 20 °F Humidity: 90% Wind: Calm Pressure: 30.42 in Hourly Precipitation: 0.00 in Windchill: 23 °F Graphs

Location: San Luis Trails, Fenton, MO

Updated: 4:58 PM CST

Temperature: 24.8 °F Dew Point: 20 °F Humidity: 83% Wind: Calm Pressure: 30.43 in Hourly Precipitation: 0.00 in Windchill: 25 °F Graphs

Location: MesoWest WARNK1 IL US UPR, Columbia, IL

Updated: 4:00 PM CST

Temperature: 24 °F Dew Point: - Humidity: - Wind: North at 255 mph Pressure: - Hourly Precipitation: 0.00 in Windchill: -11 °F Graphs

Location: Jefferson Barracks, Mehlville, MO

Updated: 4:58 PM CST

Temperature: 24.8 °F Dew Point: 22 °F Humidity: 88% Wind: Calm Pressure: 30.47 in Hourly Precipitation: 0.00 in Windchill: 25 °F Graphs

Location: APRSWXNET Sappington MO US, Saint Louis, MO

Updated: 4:22 PM CST

Temperature: 26 °F Dew Point: 23 °F Humidity: 90% Wind: Calm Pressure: 30.51 in Hourly Precipitation: 0.00 in Windchill: 26 °F Graphs

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

Updated: 4:57 PM CST

Temperature: 26.5 °F Dew Point: 24 °F Humidity: 89% Wind: SE at 2.0 mph Pressure: 30.48 in Hourly Precipitation: 0.00 in Windchill: 26 °F Graphs

Location: St. Louis, MO

Updated: 4:58 PM CST

Temperature: 25.3 °F Dew Point: 22 °F Humidity: 88% Wind: Calm Pressure: 30.40 in Hourly Precipitation: 0.00 in Windchill: 25 °F Graphs

Location: BUCKLEY MEADOWS 4, Saint Louis, MO

Updated: 4:55 PM CST

Temperature: 25.5 °F Dew Point: 23 °F Humidity: 91% Wind: WSW at 2.2 mph Pressure: 30.25 in Hourly Precipitation: - Windchill: 26 °F Graphs

Location: Hawkins/Smizer Mill, Fenton, MO

Updated: 4:57 PM CST

Temperature: 25.7 °F Dew Point: 23 °F Humidity: 88% Wind: Calm Pressure: 30.49 in Hourly Precipitation: 0.00 in Windchill: 26 °F Graphs

Location: Bent Tree Trails, Fenton, MO

Updated: 4:51 PM CST

Temperature: 26.1 °F Dew Point: 23 °F Humidity: 87% Wind: ESE at 1.6 mph Pressure: 30.17 in Hourly Precipitation: - Windchill: 26 °F Graphs

Location: Chesapeake on the Bluff, Columbia, IL

Updated: 4:57 PM CST

Temperature: 26.1 °F Dew Point: 17 °F Humidity: 69% Wind: Calm Pressure: 29.80 in Hourly Precipitation: 0.00 in Windchill: 26 °F Graphs

Location: APRSWXNET Sunset Hills MO US, Saint Louis, MO

Updated: 4:24 PM CST

Temperature: 25 °F Dew Point: 22 °F Humidity: 90% Wind: Calm Pressure: 30.50 in Hourly Precipitation: 0.00 in Windchill: 25 °F Graphs

Location: Crestwood, Crestwood, MO

Updated: 4:43 PM CST

Temperature: 25.3 °F Dew Point: 21 °F Humidity: 85% Wind: SE at 1.7 mph Pressure: 30.20 in Hourly Precipitation: - Windchill: 25 °F Graphs

Location: South County, Affton, MO

Updated: 4:58 PM CST

Temperature: 24.8 °F Dew Point: 22 °F Humidity: 90% Wind: Calm Pressure: 30.36 in Hourly Precipitation: 0.00 in Windchill: 25 °F Graphs

Location: Olde Mill Estates, Byrnes Mill, MO

Updated: 4:58 PM CST

Temperature: 24.8 °F Dew Point: 19 °F Humidity: 79% Wind: East at 4.5 mph Pressure: 30.54 in Hourly Precipitation: 0.00 in Windchill: 19 °F Graphs

Location: Big Bend and I-270, Kirkwood, MO

Updated: 4:55 PM CST

Temperature: 24.6 °F Dew Point: 18 °F Humidity: 76% Wind: Calm Pressure: 30.49 in Hourly Precipitation: 0.00 in Windchill: 25 °F Graphs

Location: Gedern Village, Columbia, IL

Updated: 4:57 PM CST

Temperature: 26.4 °F Dew Point: 24 °F Humidity: 90% Wind: Calm Pressure: 30.52 in Hourly Precipitation: 0.00 in Windchill: 26 °F Graphs

Location: Sweetbriar Lane, Kirkwood, MO

Updated: 4:40 PM CST

Temperature: 29.5 °F Dew Point: 21 °F Humidity: 71% Wind: North at - Pressure: 30.35 in Hourly Precipitation: - Windchill: 30 °F Graphs

Location: Rosewood Korner, Waterloo, IL

Updated: 4:58 PM CST

Temperature: 24.4 °F Dew Point: 23 °F Humidity: 95% Wind: ESE at 5.8 mph Pressure: 29.77 in Hourly Precipitation: 0.00 in Windchill: 17 °F Graphs

Location: Crest Ave. Kirkwood MO, St. Louis, MO

Updated: 4:51 PM CST

Temperature: 26.2 °F Dew Point: 23 °F Humidity: 87% Wind: East at 2.7 mph Pressure: 30.43 in Hourly Precipitation: - Windchill: 26 °F Graphs

Location: East Madison, Kirkwood, MO, Kirkwood, MO

Updated: 4:57 PM CST

Temperature: 24.4 °F Dew Point: 22 °F Humidity: 89% Wind: Calm Pressure: 30.54 in Hourly Precipitation: 0.00 in Windchill: 24 °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 
402 PM CST Sat Feb 28 2015 


Short term: (tonight through sunday) 
issued at 400 PM CST Sat Feb 28 2015 


Going forecast trends still looking good, with latest guidance 
still indicating two shots of snow across the forecast area over the next 24 hours. 
Have made some changes to snowfall accumulations (discussed 
below), but current headlines still depict this winter weather 
threat quite well so no changes are needed at this time. 


Intial surge of snowfall with strong warm air advection/isentropic ascent has now 
worked across the entire County Warning Area. Radar trends are supporting short 
range high res guidance which depicts strongest isentropic lift 
and heaviest precip/snowfall surging from the Ozarks into 
southern Illinois into the evening hours. Based on regional radar 
composite and reports over sgf's cwa, fairly heavy snowfall and 
rapid accumulations can be expected across the southeast half of 
the cwa, with the stl Metro on the northern edges of this 
activity. 


With the latest guidance indicating the air mass remaining colder over 
southern sections of the County Warning Area any significant mix of ptypes should 
be confined to our far southern counties, and it may be that any 
"mix" will be snow transitioning to a bit of freezing drizzle as 
the strongest lift exits the region later this evening. Based on 
the fairly heavy shot of snow this evening, as well as the ptype 
precip type remaining as snow longer than earlier expected, have 
boosted snowfall totals across most of our southern counties by 
several inches. Forecast is depicting a very tight snowfall 
gradient between familiar and cgi, and evening shift will be watching 
trends to tweak this gradient. 


While there will likely be a lull in the snowfall overnight, 
another round of accumulating snowfall is expected to develop later 
tonight and into at least Sunday morning....associated with west-east 
band of frontogenetical forcing. While intensity of this forcing 
varies depending on which model you are viewing, there is 
surprisingly good agreement in quantitative precipitation forecast fields on the development of 
this snowfall. I've attempted to trim pops a bit in our far north 
based on position of the forcing and qpf, while forecasting 
another several inches of snow in this band primarily north of 
I-70. It's certainly possible that there could be a narrow 
corridor of even heavier snowfall, but will leave this fine-tuning 
to short range updates when the meso-scale features become defined 
on radar trends. 


Precipitation should wind down over southeast sections of the County Warning Area 
on Sunday evening, followed by dry weather Monday and Monday night. 


Truett 


Long term: (sunday through next saturday) 
issued at 400 PM CST Sat Feb 28 2015 


A shortwave ejects from the cutoff low near California on Monday and induces 
surface cyclogenesis near the Colorado/Kansas border on Monday night. The 
surface low lifts quickly northeastward Monday night through early 
Tuesday night, first swinging a warm front northeastward and then 
sending a cold front southeastward through MO/IL. This low pressure 
system will bring a period of active weather to the cwa, especially 
on Monday night and Tuesday. 


Strong moisture convergence on the nose of the 850 mb low level jet interacting 
with the lifting warm front aloft should produce an area of 
precipitation on Monday night, especially in the presence of large 
scale ascent from rer 300 mb jet dynamics. The combination of cold air 
at the surface and strong warm air advection aloft is favorable for freezing rain 
and sleet. Sleet should be limited to the northern half of the County Warning Area 
where the depth of cold air will be greater and the warm nose will 
be more shallow, at least at first. As low level temps warm up on 
Tuesday morning due to a combination of warm air advection and diurnal rises, the 
precipitation will transition from freezing rain or freezing rain/ice pellets to rain. 


Tuesday will likely be the warmest day of the week due to the 
lifting warm front. Temperatures will rise into the mid 40s to mid 
50s. On Tuesday, precipitable water values rise to between 1" and 1.3", which is 
around +2 Standard deviations above normal for March. These values 
are notable because the precipitable water normals for March were calculated over 
the entire month, and Mon/Tue will only be a couple of days into the 
month. In other words, there will be an unusually high amount of 
moisture available. Rer 500 mb jet dynamics will add to the large-scale 
ascent ahead of the upper vort Max. Expect widespread rain with 
scattered embedded thunderstorms on Tuesday into early Tuesday 
night. Some of the precipitation may change back over to rain/snow or snow 
behind the cold front within the colder air. 


The aforementioned cold front should be moving through the County Warning Area by 
00z Wed. An Arctic high pressure center then spills into the region 
behind the cold front, bringing temperatures back down into the 20s 
on Wednesday and Thursday. The remainder of the cutoff low over California 
will become absorbed into the flow and lift eastward on Wednesday 
night and Thursday. Temperatures may rebound back towards more 
seasonable values on Friday after the Arctic high pressure center 
shifts eastward and return flow commences. 


Kanofsky 


&& 


Aviation: (for the 18z tafs through 18z Sunday afternoon) 
issued at 948 am CST Sat Feb 28 2015 


Snow gradually moving into the area. Looking at isentropic 
surfaces it looks like the best lift will be this afternoon up 
until about 06z. Ligth snow still beyond that but significant 
accumulating snow may taper off. Timing for cou around 18z and uin 
about 21z. Will back off on the quick drop to IFR ceilings based 
on what is out there. Plenty of sites going 3 - 5sm -sn with VFR 
ceilings. But once it sets in, IFR will stay around through 18z 
Sunday. Southeast wind will remain until front moves in Sunday. 


Specifics for kstl: at this time, I don't see IFR right off The 
Bat at the beginning of the snow. That has not happened at sites 
to the southwest so will back off a bit and bring in IFR more 
gradually, by 00z. After that, not much change with light snow and 
IFR ceilings likely through 18z Sunday if not longer. 


Jpk 


&& 


Preliminary point temperatures/pops: 
Saint Louis 26 35 22 35 / 100 80 10 10 
Quincy 21 31 14 32 / 90 90 10 10 
Columbia 25 34 20 37 / 100 80 10 10 
Jefferson City 27 35 20 38 / 100 80 10 10 
Salem 27 34 23 35 / 100 80 20 10 
Farmington 27 37 23 37 / 90 70 20 10 


&& 


Lsx watches/warnings/advisories: 
MO...Winter Weather Advisory until noon CST Sunday for Crawford MO- 
Iron MO-Madison MO-Reynolds MO-St. Francois MO-Ste. 
Genevieve MO-Washington MO. 


Winter Storm Warning until 6 PM CST Sunday for Lincoln MO-St. 
Charles MO-St. Louis city MO-St. Louis MO-Warren MO. 


Winter Weather Advisory until 6 PM CST Sunday for Audrain MO- 
Boone MO-Callaway MO-Cole MO-Franklin MO-Gasconade MO- 
Jefferson MO-Knox MO-Lewis MO-Marion MO-Moniteau MO-Monroe 
MO-Montgomery MO-Osage MO-Pike MO-Ralls MO-Shelby MO. 


Illinois...Winter Weather Advisory until noon CST Sunday for Randolph Illinois. 


Winter Storm Warning until 6 PM CST Sunday for Bond Illinois-Calhoun 
Illinois-Clinton Illinois-Fayette Illinois-Greene Illinois-Jersey Illinois-Macoupin Illinois- 
Madison Illinois-Montgomery IL-St. Clair Illinois. 


Winter Weather Advisory until 6 PM CST Sunday for Adams Illinois-Brown 
Illinois-Marion Illinois-Monroe Illinois-Pike Illinois-Washington Illinois. 


&& 


$$ 


Weather forecast office lsx 












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