Strong southerly winds ahead of a cold front gusted to 59 mph at Spencer Iowa Airport just after midnight on November 28th.
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The episode as NWS FSD wrote it up.
Strong southerly winds ahead of a cold front gusted to 59 mph at Spencer Iowa Airport just after midnight on November 28th.
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 Sioux Falls, SD wrote its last area forecast discussion before the first event at Nov 27, 10:52 PM CST, 1 hour 12 minutes earlier.
Area Forecast Discussion National Weather Service Sioux Falls SD 1052 PM CST Sun Nov 27 2016 .SHORT TERM...(This evening through Monday) Issued at 253 PM CST Sun Nov 27 2016 Band of precipitation lifting northeast through the forecast area associated with leading shortwave with an upper trough moving through the area. The upper trough is cut off from the upper steering flow, so will not be in a hurry to exit the region. With the band of precipitation tonight, a small amount of instability may result in in a few rumbles of thunder east of the James this afternoon into this evening. Overnight tonight the TROWAL starts to set up across the western edge of the forecast area. Would not be surprised at all if snow amounts are too low in the forecast, but could not change snow ratios through collaboration. Forecast is carrying 2-6:1 snow ratios while it will likely be closer to a 10-12:1 snow ratio west of I-29. With that said, would not be surprised if places such as Huron to Brookings along the highway 14 corridor picked up a quick inch of snow overnight into Monday morning. Profile right near the surface warms enough throughout the day to result in rain/snow mix along I- 29, while further to the south may be warm enough to support all rain. Model soundings suggest steep enough lapse rates that instability develops. If this is strong enough, could see snow showers develop mainly along and north of I-90 through the afternoon hours, as the intensity would be strong enough to keep precipitation mainly snow. .LONG TERM...(Monday night through Sunday) Issued at 253 PM CST Sun Nov 27 2016 Very little change to the forecast from yesterday and last night. Low pressure will cut off from the stronger upper level flow and leave a cold pocket of air in place across the northern plains Monday night into Wednesday night. The thermal structure of the atmosphere supports mainly snow with just the bottom portion of the sounding near the surface above freezing. This supports snow in most cases with some mix possible along and south of interstate 90. While accumulations will not likely amount to a whole lot due to the duration of the snow over a few days and near to slightly above freezing temperatures, 1 to 3 inches of snow will be possible north of Interstate 90. Went ahead and lowered highs a bit on Tuesday because of widespread stratus and precip potential and increased winds Wednesday and Thursday with strong gradient and some CAA. Friday through Sunday the cool pattern will continue but the chance for precipitation will not be there. Highs will be in the 30s with lows in the 20s. && .AVIATION...(For the 06Z TAFS through 06Z Monday night) Issued at 1046 PM CST Sun Nov 27 2016 Several concerns through the TAF period. Storm system lifting northward through the region will continue to blanket the area with MVFR through IFR ceilings, and reduced visibilities. Expect the lowest ceiling to be primarily found north of I-90 where isolated areas of IFR/LIFR ceilings will persist into much of Monday. Some improvement to VFR will be possible in extreme southeast SD and northwest Iowa, but will likely see occasional conditions drop to MVFR through the end of the TAF period. Winds will also remain a concern through the overnight hours, especially along and east of I-29 where gusts as high as 35 kt will be possible into the early morning hours. Rain will become more scattered overnight, remaining scattered across SD and MN counties into Monday. Could see rain briefly mix with snow towards daybreak at the HON taf. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && SHORT TERM...BT LONG TERM...08 AVIATION...
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 247 PM CST SUN NOV 27 2016 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-282100- LYON IA-OSCEOLA-DICKINSON-SIOUX-O'BRIEN-CLAY IA-PLYMOUTH-CHEROKEE- BUENA VISTA-WOODBURY-IDA-LINCOLN MN-LYON MN-MURRAY-COTTONWOOD- NOBLES-JACKSON-PIPESTONE-ROCK-DIXON-DAKOTA-BEADLE-KINGSBURY- BROOKINGS-GREGORY-JERAULD-SANBORN-MINER-LAKE-MOODY-BRULE-AURORA- DAVISON-HANSON-MCCOOK-MINNEHAHA-CHARLES MIX-DOUGLAS-HUTCHINSON- TURNER-LINCOLN SD-BON HOMME-YANKTON-CLAY SD-UNION- 247 PM CST SUN NOV 27 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST IOWA...WEST CENTRAL IOWA...SOUTHWEST MINNESOTA...NORTHEAST NEBRASKA...CENTRAL SOUTH DAKOTA...EAST CENTRAL SOUTH DAKOTA... SOUTH CENTRAL SOUTH DAKOTA AND SOUTHEAST SOUTH DAKOTA. .DAY ONE...THIS AFTERNOON AND TONIGHT WIDESPREAD SHOWERS DEVELOPING THIS AFTERNOON AND CONTINUING TONIGHT MAY BE ACCOMPANIED BY A FEW THUNDERSTORMS. NO SEVERE STORMS ARE EXPECTED. RAIN MAY MIX WITH AND CHANGE TO SNOW ALONG THE HIGHWAY 14 CORRIDOR EARLY MONDAY MORNING. SNOW ACCUMULATIONS UP TO AN INCH ARE POSSIBLE. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY AREAS OF LIGHT RAIN AND SNOW ARE EXPECTED MONDAY THROUGH WEDNESDAY...MAINLY NORTH OF INTERSTATE 90. SNOW ACCUMULATIONS... ...ARE EXPECTED TO BE LESS THAN AN INCH OR TWO..AND MOSTLY DURING THE NIGHT AND EARLY MORNING HOURS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
Strong southerly winds gusted to a peak of 59 mph at Spencer Airport.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2016Every state in 2016This day in weather historyWarnings in Iowa, November 2016
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: 662470.