Marthasville MO Weather Tomorrow and Today

Marthasville MO Weather Tomorrow and Today 7.21.2022 and 7.20.2022, temp currently is Fog/Mist
75°F
24°C

More on current conditions

Fog/Mist
75°F
24°C

Humidity
100%

Wind Speed
Calm

Barometer
29.75 in

Dewpoint
75°F (24°C)

Visibility
3.00 mi

Last update

20 Jul 7:15 am CDT

More Information:Local Forecast OfficeMore Local Wx3 Day HistoryMobile WeatherHourly Weather Forecast

7 Day Marthasville MO Weather Tomorrow and Today 7.21.2022 and 7.20.2022

Today
HotHigh: 98 °F

Tonight
ClearLow: 68 °F

Thursday
HotHigh: 99 °F

ThursdayNight
Mostly ClearLow: 71 °F

Friday
HotHigh: 101 °F

FridayNight
Partly CloudyLow: 75 °F

Saturday
HotHigh: 104 °F

SaturdayNight
Mostly ClearLow: 77 °F

Sunday
Mostly Sunnythen SlightChanceT-stormsHigh: 101 °F

We hope you like this weather data for Marthasville MO Weather Tomorrow and Today 7.21.2022 and 7.20.2022. Also for the rest of the week, too!

Detailed Forecast

TodaySunny and hot, with a high near 98. Heat index values as high as 101. Light and variable wind becoming northwest 5 to 10 mph in the morning. TonightClear, with a low around 68. Northwest wind 3 to 8 mph. ThursdaySunny and hot, with a high near 99. West wind 3 to 6 mph. Thursday NightMostly clear, with a low around 71. Calm wind. FridaySunny and hot, with a high near 101. Calm wind becoming south around 6 mph in the afternoon. Friday NightPartly cloudy, with a low around 75.SaturdaySunny and hot, with a high near 104.Saturday NightMostly clear, with a low around 77.SundayA 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 101.Sunday NightA 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 72.MondayA 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.Monday NightA 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.TuesdayA 30 percent chance of showers and thunderstorms. Partly sunny and hot, with a high near 98.

Here’s a detailed discussion below that you might like for Marthasville MO Weather Tomorrow and Today 7.21.2022 and 7.20.2022.

Area Forecast Discussion Issued by NWS St. Louis, MOHome | Current Version | Previous Version | Text Only | Print | Product List | Glossary OffVersions: 1
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000
FXUS63 KLSX 201109
AFDLSX

Area Forecast Discussion…Updated Aviation
National Weather Service Saint Louis MO
609 AM CDT Wed Jul 20 2022

.SHORT TERM… (Through Late Thursday Afternoon)
Issued at 408 AM CDT Wed Jul 20 2022

For the most part, the primary weather concern over the next two
days will be the existence of above normal, and locally dangerous
heat across primarily parts of southeast and potentially central
Missouri, with warm but generally dry and benign conditions
elsewhere.

On a synoptic scale, upper level flow will transition into a weak
northwest flow pattern today as a shortwave trough moves across the
upper Mississippi Valley region. A very weak cold front, which will
amount to little more than a wind shift, will move through the area
over the course of the afternoon. This will usher in a seasonably
warm but noticeably dry airmass, along with occasionally breezy
winds. For just about everywhere except parts of southeast Missouri,
this should result in temperatures near to perhaps a few degrees
above seasonal averages, along with generally comfortable humidity
levels. This will be especially true across central Missouri, where
deep mixing may bring afternoon dewpoints all the way down into the
50s. However, temperatures will likely climb to near 100 degrees
along and south of the diffuse boundary where 850 mb temps will
reach near the 90th percentile, with dewpoints more likely to remain
in the mid to upper 60s. This should be just enough to reach heat
index values near 105 degrees across the Ozarks area, although there
is some concern that deeper mixing may prevent this from occurring
even here. A Heat Advisory remains in effect for this afternoon for
Reynolds, Iron, and Madison counties in MO, along with many
additional counties farther south.

In addition to these warmer temperatures, there is also a very small
chance that a few afternoon showers and thunderstorms may develop
near the southeastern boundary of our forecast area across southeast
Missouri and southwest Illinois. The vast majority of this activity
is likely to remain to our southeast, however, and local
precipitation chances remain 10% or less.

A similar setup us expected tomorrow, although warmer temperatures
will begin to creep farther northwest into Central Missouri as well.
At the present time, the aforementioned deep mixing and resulting
low dewpoints are most likely to prevent heat indexes from reaching
Advisory levels. Meanwhile, areas farther north will again see
seasonably warm temperatures and more moderate humidity levels.

BRC

.LONG TERM… (Thursday Night through Tuesday)
Issued at 408 AM CDT Wed Jul 20 2022

Over the weekend, the primary weather concern continues to be the
potential for locally dangerous heat, although some magnitude and
impact uncertainties remain even during the peak of this event. A
return to a more unsettled period is looking increasingly likely
Monday and Tuesday, with the potential for showers and thunderstorms
as well.

By Friday, ensemble guidance continues to strongly suggest that an
upper level ridge will build into the area Friday and Saturday,
bringing with it anomalously warm 850 mb temperatures. While there
is some disagreement among ensembles regarding the magnitude of this
warming, it is clear that temperatures across most of the area will
climb above seasonal averages, and may approach or exceed 100
degrees at the surface across especially areas along and south of I-
70. On the other hand, southwesterly low level flow is also expected
to develop, which would promote deeper mixing and likewise lower
dewpoints, particularly across the Ozarks and central Missouri where
actual temperatures are expected to be highest. Ensemble spreads are
relatively narrow with regards to above normal temperatures in these
more southern areas, but lower dewpoints may put an upper limit on
potential heat impacts.

Another potential fly in the ointment for heat impacts, particularly
across areas north of I-70, will be the potential for cloud cover
and perhaps even decaying convection from overnight activity
dropping into the area from Iowa Saturday morning. However, this
possibility represents a minority of ensemble members (and heavily
concentrated in the CMC).

All of this being said, current guidance continues to favor an
Advisory level heat event over the weekend, potentially both Friday
and Saturday, with a slight preference for Saturday. We`ll continue
to monitor the potential mitigating factors over the next couple of
days.

Sunday continues to look like a potential transition day as a slow
moving cold front begins to sag into the area from the north,
possibly augmented by convective outflow. As this boundary slides
south and the upper ridge begins to flatten, some heat relief is
expected across at least northern Missouri and west-central
Illinois, with above normal temperatures more likely to linger
across areas farther south. However, the presence of the boundary
and increasing chances for scattered convection introduce
considerable uncertainty into Sunday`s temperature forecast, with a
sharp temperature gradient and large ensemble spreads across the
area.

This uncertainty increases further still Monday through the middle
of next week, as the upper ridge continues to flatten and the
frontal boundary continues it`s slow southward progression. On the
other hand, confidence continues to increase that this period will
be more convectively active, which is supported by the development
of precipitation among a majority of ensemble members. Little
certainty exists regarding timing or precipitation amounts, however.

BRC

&&

.AVIATION… (For the 12z TAFs through 12z Thursday Morning)
Issued at 554 AM CDT Wed Jul 20 2022

VFR conditions are expected to persist throughout the 12Z TAF
cycle. Aside from a few passing high clouds, skies should remain
mostly clear. Occasionally breezy northwesterly winds can also be
expected this afternoon, with occasional gusts to 20 kt possible.
Winds will weaken and shift to the due west overnight through
tomorrow.

&&

.FIRE WEATHER…
Issued at 408 AM CDT Wed Jul 20 2022

Building heat, deep atmospheric mixing, and occasionally breezy
southwest winds are expected to develop across a broad region
Friday and Saturday, particularly across the Ozarks and central
Missouri. While this ordinarily would be of little concern this
time of year, the ongoing drought has resulted in abnormally
stressed local fuels. The latter remains highly variable after
recent rains in the area, but any improvement was generally
localized and minimal on a large scale.

In any case, the main limiting factor for elevated or critical
fire weather conditions will likely be wind speeds at this point,
with sustained speeds likely to remain below 15 mph. Still, a few
areas may see occasional gusts approaching 20 mph, with afternoon
humidity approaching 20 to 25 percent both Friday and Saturday
afternoons.

BRC

&&

.PRELIMINARY POINT TEMPS/POPS…
Saint Louis 97 72 97 75 / 0 0 0 0
Quincy 88 67 92 69 / 0 0 0 5
Columbia 96 68 100 72 / 0 0 0 5
Jefferson City 98 69 101 73 / 0 0 0 0
Salem 95 68 93 70 / 10 0 0 0
Farmington 100 69 97 71 / 10 0 0 0

&&

.LSX WATCHES/WARNINGS/ADVISORIES…
MO…IL…None.
&&

$$

WFO LSX

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