Gusty winds occurred.
Every event with a place to put it; 6 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS DMX wrote it up.
Gusty winds occurred.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Des Moines, IA wrote its last area forecast discussion before the first event at Dec 9, 5:34 AM CST, 4 hours 18 minutes earlier.
Area Forecast Discussion National Weather Service Des Moines IA 534 AM CST Sat Dec 9 2017 ...Updated Aviation Discussion... .SHORT TERM.../Today through Tonight/ Issued at 322 AM CST Sat Dec 9 2017 Cold front moving through the state this morning and winds have begun to gust across the northern half of the CWA. A few gusts over 30 knots through 12z seem reasonable with a decent punch of PV across the east to northeast portions of the forecast area. Winds atop the mix layer generally range from 30-35 knots before gradually decreasing past 12z this morning. By this afternoon they range from 20-25 knots. Thus, the strongest winds will be early this morning but still looking at a brisk day across central Iowa. Low stratus across the north to northeast may linger through the morning hours and there may be a few flurries prior to 12z this morning. Once this cloud deck moves east, mid to high clouds look to push into the same area towards the afternoon and into the evening. Have increased cloud cover during this period across the northeast. Went slightly below MOS guidance today for max temperatures with the sporadic cloud cover this morning and decent CAA throughout the day. .LONG TERM.../Sunday through Friday/ Issued at 322 AM CST Sat Dec 9 2017 Deep northwest flow will continue for much of the longer term across the central United States although with some flattening of the pattern toward the end of the period. A surface trof will have just pushed through the forecast area at the beginning of the period but thermal advection will generally be neutral for much of the day. However, as the next wave approaches Sunday night, stronger warm advection will develop across the state with a thermal ridge crossing the forecast area on early Monday morning. Decent isentropic lift will also lead to cloudiness with the warm advection overnight, however pressure deficits remain high enough that precipitation appears unlikely across the forecast area. Surface cold front will pass through the forecast area on Monday morning with strong cold advection developing during the day. The cold advection combined with the decent pressure gradient and subsidence will lead to windy conditions on Monday with near advisory winds. Soundings indicate a shallow mixed layer during the day with winds of 40-45kts at the top of the layer and will continue to highlight the potential of the strong winds in the HWO for Monday. Another wave will approach later Wednesday into early Thursday with another up and down ride with temperatures during this time. The flow begins to flatten somewhat toward next weekend with warmer temperatures as modified Pacific air pushes into the state. Precipitation chances will remain relatively limited during this time with a general absence of deeper moisture. && .AVIATION.../For the 12Z TAFS through 12Z Sunday morning/ Issued at 533 AM CST Sat Dec 9 2017 Kept mention of MVFR stratus at FOD, MCW and ALO with periodic stratus deck moving south this morning. CAA continues throughout the day across all TAF sites. VFR conditions are expected by 15z or sooner across the north. Left out any mention MVFR ceilings at DSM as low confidence in the duration. && .DMX WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...Podrazik LONG TERM...Cogil AVIATION...Podrazik
Hazardous Weather Outlook National Weather Service Des Moines IA 324 AM CST Sat Dec 9 2017 IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075- 081>086-092>097-100930- Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun- Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene- Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper- Poweshiek-Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union- Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne- Appanoose-Davis- 324 AM CST Sat Dec 9 2017 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...Today and tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Sunday through Friday Strong and gusty northwest winds are expected on Monday with speeds of around 30 mph and gusts of 45 to 50 mph possible. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The national radar mosaic for the moment the first event began.
6 high wind. Local standard time, as filed.
Estherville ASOS and other mesonets measured gusts to as much as 63 mph.
Clarion AWOS measured gusts to 58 mph.
Estimated to hit 58 mph or greater gusts based on stations in surrounding counties.
Estimated to hit 58 mph or greater gusts based on stations in surrounding counties.
Estimated to hit 58 mph or greater gusts based on stations in surrounding counties.
Algona AWOS and other mesonets measured gusts to 63 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2017Every state in 2017This day in weather historyWarnings in Iowa, December 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 729985, 729987, 729988, 729989, 729990, 729986.