Marine Weather and Tides
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
|Sunrise 6:48AM||Sunset 7:22PM||Saturday March 28, 2020 4:06 PM CDT (21:06 UTC)||Moonrise 8:12AM||Moonset 10:32PM||Illumination 23%|
7 Day Forecast for Marine Location Near Hettick, ILHourly EDIT Help
Area Discussion for - St. Louis, MO  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS63 KLSX 282025 AFDLSX
Area Forecast Discussion National Weather Service Saint Louis MO 325 PM CDT Sat Mar 28 2020
SHORT TERM. (Through Late Sunday Night) Issued at 325 PM CDT Sat Mar 28 2020
Early this afternoon, a strong storm system was centered over eastern Nebraska moving northeast. The general upper pattern over the CONUS was one of a broad-based TROF over the western CONUS with another storm system located offshore of northern California, with an anomalously strong RIDGE based over the southeastern CONUS. At the surface, an area of low pressure around 996mb and deepening was located near KOMA. A warm front extended east of this low pressure through the Missouri-Iowa border into central Illinois and a cold front extended southward near the Missouri-Kansas border. Mostly stratiform precipitation with embedded convection existed over our region but new storms were taking shape near central Missouri with what will become our main severe weather event for today. This nicely intersects a region of strengthening and deepening lift from the main system and where clouds have cleared and destabilization is occurring in a very moist column. Temperatures in the 70s exist for most areas. Strong winds are taking shape in the dry slot of the system in western MO, where gusts have already topped 45mph in spots. This appears likely to edge into northeastern MO later this afternoon.
The center of the strong storm system will continue tracking northeast and become increasingly vertically stacked as it does so. With the surface cold front expected to push through our region this evening, look for one maybe two lines of convection (depending on the location) to drive through the forecast area during that time. Strong shear profiles especially at the lowest levels will open the door to tornado potential with storms exhibiting strong ascent along with the more usual large hail and damaging straight line winds. The storms are expected to exit the forecast area by 03-04z, maybe sooner if the second line does not develop as well as it appears to on the CAMs.
Currently affecting northeast MO is strong wind gusts mixing down from the dry slot influence. This should wane as the sun goes down, but of more importance will be strong winds pushing through later tonight as mixing levels deepen and tap into a 40kt H925 jet aloft. Will be issuing a Wind Advisory for areas near and north of I-70 where gusts to 45mph are expected and this will continue through most of Sunday.
Otherwise, look for dry weather the remainder of the period after midnight tonight. Temperatures will still be slightly above normal despite being behind the front on Sunday, with max temps in the 60s forecast, and more seasonal min temps expected Sunday night with upper 30s and lower 40s.
LONG TERM. (Monday through Next Saturday) Issued at 325 PM CDT Sat Mar 28 2020
Overall this looks to be a quieter period, at least with respect to high impact weather, with one system edging us to the south for late Monday and Tuesday and another system edging us to the north for late week. Thunder looks hard to come by in either system and ensemble QPF members are showing nothing particularly heavy either. Much more uncertainty surrounds late week PoPs and trended towards CLIMO 20 percent values.
For temperatures, the persistent upper troffiness and intrusion of cooler airmasses will initiate a more prolonged period of below normal to normal temps for a good portion of next week.
AVIATION. (For the 18z TAFs through 18z Sunday Afternoon) Issued at 1242 PM CDT Sat Mar 28 2020
VFR conditions outside of thunderstorms are expected at the TAF sites through the valid period. Main focus of thunderstorms will be associated with a pre-frontal TROF this afternoon for all sites and possibly again along the cold front itself for the STL metro sites a couple hours later early this evening. Some gusts to 20kts are possible ahead of the pre-frontal TROF with mainly south winds, but the main thrust of strong gusts to 30-35kt winds will arrive later this evening and overnight with the strongest gusts for KUIN.
LSX WATCHES/WARNINGS/ADVISORIES. MO . Wind Advisory from 1 AM to 5 PM CDT Sunday for Lincoln MO- Montgomery MO-Pike MO-Saint Charles MO-Saint Louis City MO- Saint Louis MO-Warren MO.
Wind Advisory from 10 PM this evening to 5 PM CDT Sunday for Audrain MO-Boone MO-Callaway MO-Ralls MO.
Wind Advisory until 5 PM CDT Sunday for Knox MO-Lewis MO-Marion MO-Monroe MO-Shelby MO.
IL . Wind Advisory from 1 AM to 5 PM CDT Sunday for Adams IL-Bond IL- Brown IL-Calhoun IL-Clinton IL-Fayette IL-Greene IL-Jersey IL-Macoupin IL-Madison IL-Montgomery IL-Pike IL-Saint Clair 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.
|Litchfield Municipal Airport, IL||25 mi||71 min||SSE 10||7.00 mi||Light Rain||67°F||65°F||95%||1004.4 hPa|
Link to 5 minute data for K3LF
Wind History from 3LF (wind in knots)
|1 day ago||S||NW||N||N||N||NE||NE||NE|
|2 days ago||S|
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GEOS Local Image of EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for St. Louis, MO (17,4,5,8)(on/off)  Help
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