Portage Des Sioux, MO Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for Portage Des Sioux, MO

June 16, 2024 8:02 AM CDT (13:02 UTC) Change Location
Sunrise 5:33 AM   Sunset 8:30 PM
Moonrise 2:25 PM   Moonset 1:02 AM 
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NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.

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7 Day Forecast for Marine Location Near Portage Des Sioux, MO
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Area Discussion for - St. Louis, MO
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FXUS63 KLSX 161043 AFDLSX

Area Forecast Discussion...Updated Aviation National Weather Service Saint Louis MO 543 AM CDT Sun Jun 16 2024

KEY MESSAGES

- Above average temperatures will persist through the upcoming week with today and Monday expected to be the warmest days including peak afternoon heat index values in the upper 90s to 105 F.

- Isolated to scattered showers and thunderstorms are forecast at times through the upcoming week as well, with the greatest chances (20 to 40 percent) on Monday and Tuesday during the afternoon.



SHORT TERM
(Through Late Monday Afternoon)
Issued at 355 AM CDT Sun Jun 16 2024

An upper-level ridge centered over the southern Appalachian Mountains and Ohio Valley will begin amplifying and expanding today increasing low-level southerly flow in the Mid-Mississippi River Valley at the ridge's western periphery. After a much milder night tonight (5 to 15 F warmer than 24 hours ago), ingredients will come together for the warmest day of the year thus far today, including 850-hPa temperatures warming above the 90th climatological percentile, a slight southwesterly component of low-level flow downsloped off the Ozark Mountains, and strong insolation. The result will be widespread high temperatures in the low to upper 90s F. Additionally, moisture/dewpoints will be increasing, but compensated to some degree by deep mixing and slight downsloping, contributing to peak heat index values reaching the upper 90s to 105 F this afternoon. These values fall just short of conventional hazardous thresholds; however, care should be taken by individuals spending time outdoors today. Lastly, recent CAMs are advertising that a remnant MCV from an MCS currently tracking in eastern KS will have the potential to produce a few showers and thunderstorms in northeastern MO and west-central IL this afternoon. Otherwise, dry conditions are anticipated.

On Monday, the first of a series of mid-level perturbations rotating northward around the upper-level ridge will arrive to the Mid- Mississippi River Valley, acting to enhance development of diurnal isolated to scattered showers and thunderstorms during the afternoon and evening as instability peaks and convective inhibition is at a minimum. The presence of these showers/thunderstorms and greater cloud cover along with a slight cooling of 850-hPa temperatures will lead to slightly cooler temperatures on Monday mainly along and south of I-70, but greater moisture/higher dewpoints will again promote peak afternoon heat index values reaching the upper 90s to 105 F across most of the CWA

Pfahler

LONG TERM
(Monday Night through Saturday)
Issued at 355 AM CDT Sun Jun 16 2024

The center of the upper-level ridge will shift more northeastward into the Mid-Atlantic and Northeast on Tuesday and Wednesday, allowing low-level flow to back slightly with a brief cooling of 850- hPa temperatures. Additional opportunities for diurnal isolated to scattered showers and thunderstorms are also expected Tuesday and Wednesday with the help of additional passing mid-level perturbations, leading to some uncertainty in exact temperatures each day. As a result, NBM temperature interquartile ranges still span 5 to 8 F but remain largely above average. After Wednesday, global models are in agreement that there will be a period of time that the upper-level ridge retrogrades westward slightly, which is indicated by ensemble models to support another increase in temperatures further above average and lower chances of showers and thunderstorms.

Pfahler

AVIATION
(For the 12z TAFs through 12z Monday Morning)
Issued at 543 AM CDT Sun Jun 16 2024

Largely dry and VFR flight conditions are expected through Monday morning. The only exception is a 20 percent chance of showers and thunderstorms in northeastern MO and west-central IL this afternoon, but the probability is too low at KUIN to depart from a VFR TAF.
Additionally, southerly winds will strengthen this morning with occasional gusts of 17 to 22 kt persisting through afternoon.

Pfahler

CLIMATE
Issued at 328 AM CDT Sat Jun 15 2024

Daily High Temperature Records: |=== June 16 ==|=== June 17 ==| St. Louis (KSTL) | 100 F (1952) | 99 F (1944) | Columbia (KCOU) | 99 F (2006) | 100 F (1936) | Quincy (KUIN) | 102 F (1936) | 103 F (1918) |



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




Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherAirDewPtRHinHg
KSET ST CHARLES COUNTY SMARTT,MO 7 sm68 minESE 0310 smClear79°F66°F65%29.92
KALN ST LOUIS RGNL,IL 14 sm72 minS 0510 smClear75°F66°F74%29.94
KSTL ST LOUIS LAMBERT INTL,MO 14 sm71 minS 0810 smPartly Cloudy79°F64°F61%29.94
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