Marine Weather and Tides
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.
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|Sunrise 7:31AM||Sunset 4:44PM||Thursday December 12, 2019 11:45 PM CST (05:45 UTC)||Moonrise 5:21PM||Moonset 7:52AM||Illumination 98%|
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 130510 AFDDMX
Area Forecast Discussion National Weather Service Des Moines IA 1110 PM CST Thu Dec 12 2019
Tonight through Friday Night: Forecast Confidence: Medium
High Impact Weather Highlights:
Expecting a light wintry mix of snow and freezing rain/drizzle to impact portions of central and northern Iowa Friday morning through Friday night. Although snowfall totals will only range from 1-2" and ice accumulations of just a couple hundreth are expected, hazardous travel conditions are possible especially on any untreated roads.
Initial low pressure system continues to track newd into WI late this afternoon. To the south/east of the low, mild December temps are present with readings in the mid/upper 40s across southern Iowa. However, behind the associated cold front, readings have fallen off into 10s and 20s and NW Iowa. Besides some flurries or snow showers behind cold front, expecting rather benign conditions this evening and into the overnight. Lows will be much colder than last night with readings in the lower teens north to the middle 20s south.
Friday . another upper shortwave trough will move across the Midwest. Increasing SW flow ahead of this system will induce another round of moderate WAA/isentropic lift peaking from mid- morning through afternoon. This combined with moisture advection /specific humidity 3-4 g/kg on 285-290K/ will lead to another round of light precipitation. There is still some uncertainty with exact QPF amounts, with the CAM /HREF/ solutions showing higher values than the global ensemble counterparts. Even the higher /90th percentile/ solutions are only showing around 0.20" and would expect 0.02" to 0.10" to be more common. The bigger challenge is likely to be thermal profiles and resultant p-type. Deep saturation through the ice nucleation layer will likely yield mostly snow with the initiation wave of precipitation although the warm layer aloft tries to push above zero, and PBL temps also approach 0C near and south of US30. Thus, a messy mix of light snow, freezing, rain, sleet, or even rain are possible. As mentioned, only light snow and ice accums are expected, but travel problems could occur. After the initial wave of forcing pushes north and east after 21-00z, model soundings indicate that a fairly deep saturated layer may persist in the lowest 1-2KM. So, a continuation of at least patchy drizzle/freezing drizzle is possible into Friday night.
LONG TERM. /Saturday through Thursday/ Issued at 211 PM CST Thu Dec 12 2019
Forecast Confidence: Medium
Sfc high pressure is forecast to move across the Midwest on Saturday and Sunday with a predominantly zonal flow aloft. While conditions are expected to be dry, temperatures will once again trend below mid December averages with highs only in the teens and 20s.
Still watching the potential system for Sunday night into Monday night as additional shortwave energy ejects out of the mean longwave trough over the western and central CONUS. The various deterministic and ensemble guidance continues to show lee cyclogenesis over the central plains with a sfc low eventually ejecting e/newd. Still quite a bit of uncertainty with the evolution of this system due to timing and phasing differences. At this point, impactful weather is still possible over southern Iowa and south - but will need to watch the evolution over the next few days. Temperatures still look to remain below normal early next week, with some indications of a modest warming trend from mid to late week.
AVIATION. /For the 06Z TAFS through 06Z Friday night/ Issued at 1110 PM CST Thu Dec 12 2019
It should be dry overnight, but confidence is low with regard to ceilings with quite variable conditions ranging from clear to IFR over short distances. Precip is expected to develop later Friday morning however, initially in the form of light snow but also potentially mixing with drizzle or freezing drizzle by afternoon. MVFR/IFR ceilings will become more widespread over the northern half of IA as well with patchy LIFR not ruled out. Much of the precip should diminish around 00z, but IFR/MVFR stratus will become more widespread and advance southward by evening.
DMX WATCHES/WARNINGS/ADVISORIES. NONE.
SHORT TERM . Fowle LONG TERM . Fowle AVIATION . Small
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||52 min||NNW 6||8.00 mi||A Few Clouds||17°F||12°F||84%||1018.5 hPa|
|Ankeny Regional Airport, IA||24 mi||50 min||NNW 8||10.00 mi||Overcast||21°F||19°F||93%||1017.9 hPa|
Link to 5 minute data for KAMW
Wind History from AMW (wind in knots)
|1 day ago||S||S||SE||Calm||E||N||N||N||N||N||NE||NE||NE||NE||E||E||E||E||E||E||E||E||E|
|2 days ago||W||W||W||W||W||W||NW||Calm||W||NW||NW|
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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.
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Wind Forecast for Des Moines, IA (0,6,7,8)(on/off)  Help
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