Marine Weather and Tides
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.
|Sunrise 5:59AM||Sunset 8:20PM||Tuesday July 27, 2021 1:25 AM CDT (06:25 UTC)||Moonrise 9:55PM||Moonset 8:43AM||Illumination 91%|
7 Day Forecast for Marine Location Near Wright City, MOHourly EDIT Help
Area Discussion for - St. Louis, MO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS63 KLSX 270328 AFDLSX
Area Forecast Discussion . Updated Aviation National Weather Service Saint Louis MO 1028 PM CDT Mon Jul 26 2021
SHORT TERM. (Through Late Tuesday Night) Issued at 243 PM CDT Mon Jul 26 2021
High pressure centered over southeast Iowa has brought clear conditions to most of the region today with a steady feed of drier air from the northeast. High temperatures today are within a few degrees of normal (90F) and dewpoints have dropped into the 60s. Tonight will be pleasant by late July standards, with temperatures dropping into the 60s areawide as the surface ridge remains anchored over eastern MO and Illinois. As was the case last night, some patchy river valley fog will once again be possible and could locally reduce visibility.
Aloft, the upper level ridge across the Rockies will begin to expand and intensify into the central Plains on Tuesday. Rising heights and return flow on the western side of the departing ridge of high pressure will lead to an increase in temperature on Tuesday with highs in the lower 90s. Thankfully, mixing and a southeast surface wind will help keep dewpoints low enough that heat indices will remain below advisory criteria (105F) on Tuesday.
LONG TERM. (Wednesday through Next Monday) Issued at 243 PM CDT Mon Jul 26 2021
1) A short period of dangerous heat is likely Wednesday & Thursday 2) Cooler temperatures and an increased chance of thunderstorms arrive late in the work week and continue into the weekend
The upper level ridge will expand into the lower Missouri River Valley and the low level thermal ridge will slowly shift south across the area Wednesday and Thursday, providing a favorable setup for a relatively short period of dangerous heat. Heat indices will rise above 100 degrees Wednesday, but have concerns that afternoon mixing will result in lower dewpoints and keep much of the area from reaching criteria Wednesday afternoon. Thursday has the best potential to reach criteria, as dewpoints begin to pool ahead of an approaching cold front and a more westerly wind direction should favor air temperatures rising into the upper 90s. We have been messaging the potential for dangerous heat the past few days and will continue to do so this afternoon. Later shifts can issue heat headlines as warranted.
Thankfully the hot pattern will break down quickly as a series of strong shortwaves carve out an impressive upper level trough across the eastern CONUS. The first such shortwave will also send a cold front south through the area Thursday evening/night with an accompanied chance of thunderstorms.
Latest blended model guidance continues to support temperatures falling below normal for the upcoming weekend with several chances of rainfall as an active northwest flow weather pattern becomes established.
AVIATION. (For the 06z TAFs through 06z Tuesday Night) Issued at 1026 PM CDT Mon Jul 26 2021
No major updates. VFR flight conditions will persist with light and variable winds. Even though patchy river fog is expected to develop once again, confidence is low that it will affect KJEF, KSUS or KCPS, so left out mention at this time.
LSX WATCHES/WARNINGS/ADVISORIES. MO . None. IL . None.
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|St. Louis, Spirit Of St. Louis Airport, MO||27 mi||32 min||N 0||8.00 mi||Fair||69°F||66°F||90%||1016.1 hPa|
Link to 5 minute data for KSUS
Wind History from SUS (wind in knots)
|1 day ago||Calm||SW||Calm||Calm||W||N||E||S||Calm||SW||W||NW||NW|
|2 days ago||W||Calm||Calm||Calm||Calm||SW||SW||SW||W||W||W||SW||SW||SW||W||W||W||W||S||W||Calm||Calm||Calm||SW |
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