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 5:37AM||Sunset 8:55PM||Monday June 21, 2021 2:33 AM CDT (07:33 UTC)||Moonrise 4:31PM||Moonset 2:08AM||Illumination 86%|
7 Day Forecast for Marine Location Near Nevada, IAHourly EDIT Help
Area Discussion for - Des Moines, IA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS63 KDMX 210440 AFDDMX
Area Forecast Discussion National Weather Service Des Moines IA 1140 PM CDT Sun Jun 20 2021
UPDATE. Issued at 909 PM CDT Sun Jun 20 2021
The cold front has advanced across nearly our entire forecast area at this time, excepting a few counties in the southeast, and storms have cleared out for the time being. Most of the severe thunderstorm watches have been cancelled and the remainder will be gone in less than two hours. Continuing trend of ramping down thunderstorm chances/coverage in short-term forecast updates. Still anticipate cool, dry, quiet weather Monday into Tuesday.
DISCUSSION. /Tonight through Sunday/ Issued at 435 PM CDT Sun Jun 20 2021
21Z SEVERE THREAT UPDATE FOR TONIGHT: Low pressure has moved into southeast Minnesota with the cold front just entering far northwest Iowa and an upper-level jet streak entering southern Minnesota and NW Iowa. The low is expected to continue to track eastward across southern Minnesota through the afternoon hours bringing the cold front with it passing northwest to southeast through Iowa this afternoon into evening.
CAMs still hint that storms will initiate along and ahead of this approaching cold front. Plenty of 0-3km CAPE, 2000-3000 J/kg of MLCAPE, and 50 knots of wind shear along with steepening lapse rates are expected in the warm sector. Our main window for convection looks to be 3-9pm starting in northern Iowa, where convection has initiated. However, storms have been slow to take off likely to inhibition concerns.
The main concerns with the storms this afternoon and evening continue to be large hail and damaging wind gusts, but a tornado or two cannot be ruled out in our far eastern counties, though the main tornado risk is likely further east where soundings show winds are better backed with height.
The overall severe threat appears to be along and north of a Pocahontas to Tama county line, with a secondary area of concern over south central to southeast Iowa, where storms will likely be more isolated, but still have the potential to be strong to severe. These two areas are reflected in Severe Thunderstorm Watches #293 and #294 with storms expected to intensify along the front moving across the state with large hail and damaging wind as the main threats.
Forecast Highlights Monday through Sunday: -- Cooler temperatures with lower humidity Monday and Tuesday. -- Return to normal to above normal temperatures mid-week. -- Next rain chances Tuesday with better storm chances later Thursday into Friday.
THIS WEEK: After the cold front passes through the state tonight, cooler temperatures and drier air are expected to start the work week beneath a longwave trough. High temperatures on Monday will be in the upper 60s to low 70s and in the 70s to low 80s on Tuesday. Dew points will be back in the 40s, making for some very nice days to start the week!
Shower and storm chances return later Tuesday but any severe risk is tied to moisture return which may be limited with northwest flow aloft, though with low-level theta-e advection moving into the state and some modest instability a few stronger storms could occur, provided moisture return takes place, but widespread thunderstorms or severe weather seems unlikely at this time. As the longwave trough pushes east on Wednesday, ridging returns as do warmer temperatures. A trough and associated front on Thursday brings higher chances for storms, later Thursday into Friday, with dry and slightly cooler temperatures to start the next weekend.
AVIATION. /For the 06Z TAFS through 06Z Monday night/ Issued at 1139 PM CDT Sun Jun 20 2021
A few lingering low clouds may produce brief MVFR ceilings at FOD/MCW/ALO in the next couple hours. Otherwise, VFR conditions are forecast for the remainder of the TAF period with no precipitation or flight restrictions.
DMX WATCHES/WARNINGS/ADVISORIES. NONE.
UPDATE . Lee DISCUSSION . KCM/Small AVIATION . Lee
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.
|Ames, Ames Municipal Airport, IA||9 mi||41 min||NW 10 G 20||10.00 mi||61°F||54°F||78%||1008.1 hPa|
|Boone Municipal, IA||21 mi||39 min||NW 11 G 19||10.00 mi||Fair||61°F||54°F||77%||1010.2 hPa|
|Ankeny Regional Airport, IA||24 mi||39 min||NNW 12 G 20||10.00 mi||Fair||63°F||55°F||77%||1009.1 hPa|
Link to 5 minute data for KAMW
Wind History from AMW (wind in knots)
|1 day ago||E||Calm||N||N||N||N||N||N||N||N||N||N||W|
|2 days ago||W||N||N||N||N||W||NE|
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