Marine Weather and Tides
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 6:19AM||Sunset 7:43PM||Sunday April 18, 2021 3:56 PM CDT (20:56 UTC)||Moonrise 9:30AM||Moonset 12:08AM||Illumination 43%|
7 Day Forecast for Marine Location Near Winchester, MOHourly EDIT Help
Area Discussion for - St. Louis, MO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS63 KLSX 182005 AFDLSX
Area Forecast Discussion National Weather Service Saint Louis MO 305 PM CDT Sun Apr 18 2021
SHORT TERM. (Through Late Monday Afternoon) Issued at 304 PM CDT Sun Apr 18 2021
Early this afternoon, an upper longwave TROF was over central and eastern North America with several shortwave disturbances of note imbedded within. The first was crossing through southern Missouri currently and was helping to instigate showers and a few thunderstorms across our region. The second disturbance was located in western Alberta province while another was over the Northwestern Territories in Canada. Scattered showers and a few storms dotted our area this afternoon with temperatures from the mid 50s to mid 60s.
The first disturbance will exit our area early this evening and with loss of diurnal heating, should result in dissipation of clouds and showers/storms. Min temps are expected to drop into the upper 30s and lower 40s.
A cold front will begin to drop into our region on Monday and while there has been better convergence on the speed of this front through our area, there remains some differences in guidance on this feature. That said, there is good confidence on the front not making it south of I-70 until after sunset Monday evening, leaving a mostly sunny day with W-SW winds to drive temps well into the 60s, topping out in the low 70s in spots. Cooler air will filter into northern MO and central IL from a likely cold FROPA, resulting in temps topping out around 60 there and falling through the 50s Monday afternoon. Used the highest MOS for a starting point for max temps most areas Monday and increasing a degree or two further, which has verified well the past few "warm" day scenarios.
LONG TERM. (Monday Night through Next Sunday) Issued at 304 PM CDT Sun Apr 18 2021
Key messages in the extended period:
1) Widespread precipitation is a near certainty between early Tuesday morning and early Tuesday evening, on the leading edge of a significant push of unusually cold air for this time of year.
2) Accumulating snow looks increasingly likely for areas near Quincy, IL to Columbia, MO and areas northwest from there, with up to 2" of snow possible mainly on grassy surfaces. Temps look to be above freezing throughout the event. Snow may even be seen for areas farther southeast, including the STL metro area, but accumulating snow chances look very low there.
3) Unseasonably cold air is expected to follow the rain/snow event on Tuesday with record cold likely on Wednesday morning and a widespread freeze. A Freeze Watch has been issued for Wednesday morning. We have not seen temperatures this cold this late in April in the Saint Louis area (32F or lower) since 1986 and in the Columbia area (28F or lower) since 1967. Another round of record cold is possible again on Thursday morning. See the CLIMATE section for details.
The rest of the forecast supports a trend back to above normal temps by late this week with another round of rain looking more likely.
AVIATION. (For the 18z TAFs through 18z Monday Afternoon) Issued at 1137 AM CDT Sun Apr 18 2021
VFR conditions are expected to prevail at the TAF sites through the valid period. PoPs high enough to justify VC mentions will exist this afternoon for all TAF sites with loss of heating and exit of sources of lift responsible for the sharp reduction around 00z/Mon. Clear skies are then expected for much of tonight with some brief VSBY reductions expected in mist at KSUS early Monday morning as their temps edge near crossover values. Otherwise, dry weather will prevail tonight and through the remainder of the valid period as surface winds start picking up to near 10-12kts sustained with some gusts ahead of the cold front late Monday morning. A cold FROPA is currently anticipated at KUIN at 17z/Mon.
SPECIFICS FOR KSTL: for the extended 30-hour period, have held off on any cold FROPA mention with the front expected to be very close by the end of the valid period but probably just north of the terminal.
CLIMATE. Issued at 1137 AM CDT Sun Apr 18 2021
An unusually chilly airmass is expected to affect our area for the middle of the week. Here is a look at record min temps and record low max temps during that time.
TUE 4/20 WED 4/21 THU 4/22
RECORD MIN TEMPERATURES St. Louis (KSTL) 28/1904 32/1904 31/1936 Columbia (KCOU) 28/1953 29/1907 29/1986 Quincy (KUIN) 27/2013 26/1904 27/1986
RECORD LOW MAX TEMPERATURES St. Louis (KSTL) 42/1918 46/1893 43/1884 Columbia (KCOU) 38/1918 42/1992 48/1893 Quincy (KUIN) 39/1918 37/1918 44/1927
LSX WATCHES/WARNINGS/ADVISORIES. MO . Freeze Watch from late Tuesday night through Wednesday morning for Audrain MO-Boone MO-Callaway MO-Cole MO-Crawford MO- Franklin MO-Gasconade MO-Iron MO-Jefferson MO-Knox MO-Lewis MO-Lincoln MO-Madison MO-Marion MO-Moniteau MO-Monroe MO- Montgomery MO-Osage MO-Pike MO-Ralls MO-Reynolds MO-Saint Charles MO-Saint Francois MO-Saint Louis City MO-Saint Louis MO-Sainte Genevieve MO-Shelby MO-Warren MO-Washington MO.
IL . Freeze Watch from late Tuesday night through Wednesday morning for Adams IL-Bond IL-Brown IL-Calhoun IL-Clinton IL-Fayette IL-Greene IL-Jersey IL-Macoupin IL-Madison IL-Marion IL- Monroe IL-Montgomery IL-Pike IL-Randolph IL-Saint Clair- Washington IL.
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|St. Louis, Spirit Of St. Louis Airport, MO||8 mi||63 min||W 9 G 19||10.00 mi||Partly Cloudy||61°F||36°F||39%||1013.3 hPa|
|St. Louis Lambert International Airport, MO||15 mi||66 min||NW 7||10.00 mi||Mostly Cloudy||66°F||31°F||27%||1013 hPa|
|St. Louis Downtown Airport, IL||20 mi||64 min||NNW 11 G 14||10.00 mi||A Few Clouds||66°F||30°F||26%||1012.6 hPa|
Link to 5 minute data for KSUS
Wind History from SUS (wind in knots)
|1 day ago||N||N||NE||N||NW||W||Calm||Calm||S||S||SW||W||W||W||NW||W||W||W||W||SW||W||N||Calm||SW|
|2 days ago||NW||N||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||SW||Calm||Calm||Calm||NE||NW |
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