St. Louis, Missouri 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for 2 Miles WSW Brooklyn IL
National Weather Service Forecast for:
2 Miles WSW Brooklyn IL
Issued by: National Weather Service Saint Louis, MO |
Updated: 2:21 pm CDT Jul 25, 2025 |
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This Afternoon
 Isolated T-storms
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Tonight
 Isolated T-storms then Partly Cloudy
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Saturday
 Mostly Sunny then Isolated T-storms
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Saturday Night
 Isolated T-storms then Partly Cloudy
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Sunday
 Slight Chance T-storms
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Sunday Night
 Partly Cloudy
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Monday
 Hot
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Monday Night
 Mostly Clear
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Tuesday
 Sunny then Slight Chance T-storms
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Hi 96 °F |
Lo 78 °F |
Hi 94 °F |
Lo 80 °F |
Hi 95 °F |
Lo 81 °F |
Hi 99 °F |
Lo 80 °F |
Hi 100 °F |
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Extreme Heat Warning
Hazardous Weather Outlook
This Afternoon
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Isolated showers and thunderstorms. Mostly sunny, with a high near 96. Heat index values as high as 106. Southeast wind 3 to 6 mph. Chance of precipitation is 20%. |
Tonight
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Isolated showers and thunderstorms before 11pm. Partly cloudy, with a low around 78. South wind around 6 mph. Chance of precipitation is 20%. |
Saturday
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Isolated showers and thunderstorms after 3pm. Mostly sunny, with a high near 94. Heat index values as high as 105. South wind 5 to 8 mph. Chance of precipitation is 20%. |
Saturday Night
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Isolated showers and thunderstorms before 10pm. Partly cloudy, with a low around 80. South wind 3 to 6 mph. Chance of precipitation is 20%. |
Sunday
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A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95. Southwest wind 3 to 6 mph. |
Sunday Night
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Partly cloudy, with a low around 81. |
Monday
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Sunny and hot, with a high near 99. |
Monday Night
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Mostly clear, with a low around 80. |
Tuesday
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A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 100. |
Tuesday Night
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A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 80. |
Wednesday
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A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93. |
Wednesday Night
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A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. |
Thursday
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A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 85. |
Forecast from NOAA-NWS
for 2 Miles WSW Brooklyn IL.
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Weather Forecast Discussion
614
FXUS63 KLSX 251938
AFDLSX
Area Forecast Discussion
National Weather Service Saint Louis MO
238 PM CDT Fri Jul 25 2025
.KEY MESSAGES...
- Dangerous heat and humidity will spread gradually northward this weekend,
with the hottest days expected to be Monday and Tuesday.
- Isolated to widely scattered thunderstorms are forecast through
this evening, mainly across east-central Missouri and south-
central Illinois. A few may be strong to severe through 9PM,
with damaging wind gusts the main threat.
- A definitive end to the heat wave is in the offing next week as
a cold front moves through the region. There is some uncertainty
on the timing, but everyone by Thursday should experience
temperatures back below normal for the first time in over 2
weeks.
&&
.SHORT TERM... (Through Late Saturday Afternoon)
Issued at 223 PM CDT Fri Jul 25 2025
Isolated to widely scattered showers along with a few
thunderstorms have developed over the past couple of hours, mainly
in southeast Missouri and southwest Illinois. This activity has
largely been along/southeast of what looks to be the remnant
composite outflow boundary from last night`s convection. So far
everything has been very weak, and latest GOES-16 satellite
imagery does not show much in the way of agitated cumulus.
However, the environment is at least marginally supportive for
semi-organized thunderstorm clusters given high MLCAPE (2000-3000
J/kg) and respectable effective shear (20-25 knots). Therefore,
would not be too surprising to see a few storms capable of
producing damaging winds (via microbursts) through about 8 or 9 PM
this evening. After that time frame, storms should gradually
weaken and eventually dissipate by midnight.
Overnight tonight, the chances of any showers and thunderstorms are
mostly confined to parts of northeast Missouri and west-central
Illinois. This is closer to the synoptic warm front, and where
modest low-level moisture convergence will reside. Better chances of
showers and thunderstorms however will remain to our northwest.
Model guidance is in pretty good agreement that an MCV will track
across the mid-Missouri Valley into southern Iowa. While the
majority of this activity will not impact us, parts of northeast
missouri may get clipped by the southeastern flank of the more
widespread area of showers and thunderstorms.
For Saturday, the expectation is for a composite outflow boundary
associated with early morning convection mainly in Iowa to drift
eastward. By early afternoon, scattered thunderstorms are expected
to develop along this southwest-northeast draped boundary. The best
chances (40-60%) are forecast from central Missouri through west-
central Illinois based on where the outflow boundary is most
likely to be located Saturday afternoon. Cannot rule out a couple
of stronger storms capable of producing gusty winds, but unlike
this afternoon there will be very little deep-layer shear. This is
because the mid/upper level winds really slacken off behind the
departing MCV as it heads toward the Great Lakes. Without much if
any deep-layer shear, thunderstorms should be very pulse like and
weaken before they get too strong.
Heat of course is the bigger concern on Saturday. For the most
part, conditions Saturday afternoon look pretty similar to this
afternoon with highs in the low to mid 90s and peak heat index
values in the 100-105+F. The highest values are expected to be
in/around the urban heat island of metropolitan St. Louis and
adjacent southwest Illinois. The one difference will be that the
dangerous heat should expand a bit northward. Exactly how far
north is a bit of a question mark (due to clouds and the
aforementioned outflow), but did elect to expand the heat advisory
another row or two of counties where confidence in seeing 100+
heat index values was highest.
Gosselin
&&
.LONG TERM... (Saturday Night through Next Friday)
Issued at 223 PM CDT Fri Jul 25 2025
(Saturday Night - Tuesday Night)
Low chances of showers and thunderstorms exists Saturday night and
Sunday over portions of the area, but the focus should continue to
migrate northward as the mid/upper level anticyclone builds
poleward. Therefore, it is basically all about the intensifying heat
late this weekend into early next week. The peak of this heat event
is still expected to be on Monday and Tuesday afternoons as this is
when the mid-Mississippi Valley will be directly beneath the
anomalous mid/upper level anticyclone and when the 850-hPa thermal
ridge draped across the area. High temperatures should peak out in
the mid to upper 90s each day, with some locations (especially St.
Louis) at least flirting with the century mark. There is some
uncertainty with dewpoints, as conceptually speaking day after
day of dry weather and some deeper mixing suggests they may drop
more into the low 70s, or even upper 60s in parts of central,
southeast, and east-central Missouri. Regardless, it will be very
hot and humid with more of the area topping out in the 105-110F
range for peak heat index readings each of Monday and Tuesday
afternoons.
(Wednesday - Next Friday)
Confidence remains high that a major pattern change will take place
mid/late next week as the overall flow across the CONUS becomes very
amplified for mid summer. In fact, it looks a bit more like
something you typically see in late September/October. Anomalous
troughing (500-hPa heights 1-2 sigma below normal) is expected to
dig into southeastern Canada/New England, with a cold front moving
through the bi-state area sometime Wednesday/Wednesday night.
There remains some uncertainty on the exact timing, which will
have large ramifications on Wednesday`s high temperatures (and the
potential for one last day of this heat event). The latest spread
between the 10th/90th percentiles of the NBM is in the 10-15F
range, which is not surprising given the ongoing heat ahead of the
boundary and the strength of the air mass behind the front.
Speaking of which, there remains a very good signal for at least
slightly below normal temperatures to end the work week (and
likely into the following weekend). This is in large part due to
the strength of the incoming surface high due to the strong
mid/upper level confluent flow between the mid/upper level ridge
across the intermountain west and the aforementioned trough in
southeast Canada. In fact, the NAEFS has a 1026+ hPa surface high
sliding into the Upper Midwest Thursday. This would be a near-
record breaking surface high and a very strong signal from the
NAEFS mean some 144-168 hours out.
While there remains some uncertainty as to precisely "how cool"
it will be, the spread between the 25th/75th percentile for highs
Thursday/Friday of next week has lowered over the past 24-48 hours.
In general, most sites only have a spread of about 2-4F. Given
that the 75th percentiles are still some 5+ degrees below normal,
the overall confidence that not only below normal but WELL below
normal temperatures has increased. Highs in the mid 70s to low 80s
are forecast from north to south, with lows in the upper 50s to
mid 60s.
Gosselin
&&
.AVIATION... (For the 18z TAFs through 18z Saturday Afternoon)
Issued at 1211 PM CDT Fri Jul 25 2025
Isolated to widely scattered showers and thunderstorms are
expected this afternoon/early evening. The coverage was too low to
add any PROB30s, but we will monitor how things evolve. If any
thunderstorm does manage to directly hit a terminal, brief heavy
downpours and gusty winds would be the primary threats. Later on
tonight into Saturday morning, the focus for showers and
thunderstorms mainly shifts northwest of the area into northwest
Missouri and Iowa. KUIN has the best chance in our region, and may
see a brief period of thunderstorms. Therefore, did keep a PROB30
between 0300 and 0600 UTC. Outside of any thunderstorms hitting a
terminal, dry/VFR conditions are expected with light/variable
winds. A brief period of MVFR BKN ceilings with bases in the
2000-3000 feet AGL range are possible at KUIN early this
afternoon, but confidence was too low to add a TEMPO.
Gosselin
&&
.LSX WATCHES/WARNINGS/ADVISORIES...
MO...Heat Advisory until 7 PM CDT Tuesday for Boone MO-Callaway MO-
Cole MO-Crawford MO-Gasconade MO-Iron MO-Lincoln MO-Madison
MO-Moniteau MO-Montgomery MO-Osage MO-Reynolds MO-Saint
Francois MO-Warren MO-Washington MO.
Extreme Heat Warning until 7 PM CDT Tuesday for Franklin MO-
Jefferson MO-Saint Charles MO-Saint Louis City MO-Saint
Louis MO-Sainte Genevieve MO.
Heat Advisory from noon Saturday to 7 PM CDT Tuesday for Audrain
MO-Monroe MO-Pike MO-Ralls MO.
IL...Heat Advisory until 7 PM CDT Tuesday for Calhoun IL-Fayette IL-
Greene IL-Jersey IL-Macoupin IL-Montgomery IL.
Extreme Heat Warning until 7 PM CDT Tuesday for Bond IL-Clinton
IL-Madison IL-Marion IL-Monroe IL-Randolph IL-Saint Clair
IL-Washington IL.
Heat Advisory from noon Saturday to 7 PM CDT Tuesday for Pike IL.
&&
$$
WFO LSX
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