Alert archive / Iowa / Winter Weather Advisories in 2018
Winter Weather Advisory 21, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this winter weather advisory at Apr 18, 2018, 2:59 AM CDT for Lyon County, Sioux County, Iowa. It took effect at Apr 18, 2018, 4:00 AM CDT. It was in force for 14 hr.
The area
The counties it named.
The facts
- Issued
- Apr 18, 2018, 2:59 AM CDT (07:59 UTC)
- In effect from
- Apr 18, 2018, 4:00 AM CDT
- Expired
- Apr 18, 2018, 5:44 PM CDT
- In force
- 14 hr
- Issued by
- NWS Sioux Falls, SD
Counties Lyon County, IA, Sioux County, IA
The radar
The Sioux Falls radar (KFSD), 59 km from the middle of the area, began a volume at 08:02 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 8.0 hours before the alert went out and 213 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1999 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 505 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
421 WWUS43 KFSD 180759 WSWFSD URGENT - WINTER WEATHER MESSAGE National Weather Service Sioux Falls SD 259 AM CDT Wed Apr 18 2018 IAZ001-012-181600- /O.CAN.KFSD.WW.Y.0020.000000T0000Z-180418T2100Z/ /O.NEW.KFSD.WW.Y.0021.180418T0900Z-180419T0000Z/ Lyon IA-Sioux- 259 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Snow expected. Total snow accumulations of 3 to 5 inches are expected. * WHERE...Lyon IA and Sioux Counties. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on slippery road conditions, including during the morning commute. Expect reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MNZ071-072-SDZ040-180900- /O.CAN.KFSD.WW.Y.0020.180418T0900Z-180419T0000Z/ Lincoln MN-Lyon MN-Brookings- 259 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY IS CANCELLED... The storm system is shifting south, and thus less snow is expected through the Highway 14 corridor. Occasional light snow may still produce accumulations up to 2 inches. $$ SDZ038-039-180900- /O.CAN.KFSD.WW.Y.0020.000000T0000Z-180418T2100Z/ Beadle-Kingsbury- 259 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY IS CANCELLED... The storm system is shifting south, and thus less snow is expected through the Highway 14 corridor. Occasional light snow may still produce accumulations up to 2 inches. $$ IAZ002-003-013-014-181600- /O.UPG.KFSD.WW.Y.0020.180418T0900Z-180419T0000Z/ /O.NEW.KFSD.WS.W.0007.180418T0900Z-180419T0000Z/ Osceola-Dickinson-O'Brien-Clay IA- 259 AM CDT Wed Apr 18 2018 ...WINTER STORM WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Heavy snow expected. Total snow accumulations of 5 to 7 inches are expected, with locally higher amounts possible. * WHERE...Osceola, Dickinson, O'Brien and Clay IA Counties. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on difficult travel conditions, including during the morning commute. Expect significant reductions in visibility at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IAZ021-022-181600- /O.UPG.KFSD.WW.Y.0020.000000T0000Z-180418T2100Z/ /O.NEW.KFSD.WS.W.0007.180418T0900Z-180419T0000Z/ Cherokee-Buena Vista- 259 AM CDT Wed Apr 18 2018 ...WINTER STORM WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Heavy snow expected, with brief mixed precipitation possible. Total snow accumulations of 5 to 7 inches are expected, with locally higher snowfall amounts and a glaze of ice accumulation possible. * WHERE...Cherokee and Buena Vista Counties. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on difficult travel conditions, including during the morning commute. Expect significant reductions in visibility at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning means significant amounts of snow, sleet and ice will make travel very hazardous or impossible. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IAZ031-NEZ014-SDZ070-071-181600- /O.EXT.KFSD.WW.Y.0020.000000T0000Z-180418T1800Z/ Woodbury-Dakota-Clay SD-Union- 259 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 1 PM CDT THIS AFTERNOON... * WHAT...Snow expected, possibly mixing with rain before ending. Total snow accumulations of 3 to 5 inches are expected, with locally higher amounts possible. * WHERE...In South Dakota, Clay SD and Union Counties. In Nebraska, Dakota County. In Iowa, Woodbury County. * WHEN...Until 1 PM CDT this afternoon. * ADDITIONAL DETAILS...Plan on slippery road conditions, including during the morning commute. Expect reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory means that periods of snow, sleet or freezing rain will cause travel difficulties. Expect slippery roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ SDZ056-181600- /O.EXT.KFSD.WW.Y.0020.180418T0759Z-180418T2100Z/ Moody- 259 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 4 PM CDT THIS AFTERNOON... * WHAT...Snow expected, possibly mixing with rain before ending. Total snow accumulations of 2 to 5 inches are expected. * WHERE...Moody County. * WHEN...Until 4 PM CDT this afternoon. * ADDITIONAL DETAILS...Plan on slippery road conditions, including during the morning commute. Expect reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NEZ013-SDZ050-052-057>059-063>065-068-069-181600- /O.CON.KFSD.WW.Y.0020.000000T0000Z-180418T1800Z/ Dixon-Gregory-Jerauld-Brule-Aurora-Davison-Charles Mix-Douglas- Hutchinson-Bon Homme-Yankton- 259 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 PM CDT THIS AFTERNOON... * WHAT...Snow expected, possibly mixing with rain before ending. Total snow accumulations of 2 to 5 inches are expected, with locally higher amounts possible. * WHERE...Portions of central, south central and southeast South Dakota and northeast Nebraska. * WHEN...Until 1 PM CDT this afternoon. * ADDITIONAL DETAILS...Plan on slippery road conditions, including during the morning commute. Expect reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory means that periods of snow, sleet or freezing rain will cause travel difficulties. Expect slippery roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IAZ020-032-SDZ053>055-060>062-066-067-181600- /O.CON.KFSD.WW.Y.0020.000000T0000Z-180418T2100Z/ Plymouth-Ida-Sanborn-Miner-Lake-Hanson-McCook-Minnehaha-Turner- Lincoln SD- 259 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 PM CDT THIS AFTERNOON... * WHAT...Snow expected, possibly mixing with rain before ending. Total snow accumulations of 2 to 5 inches are expected, with locally higher amounts possible south of Highway 18. * WHERE...Portions of east central and southeast South Dakota and northwest and west central Iowa. * WHEN...Until 4 PM CDT this afternoon. * ADDITIONAL DETAILS...Plan on slippery road conditions, including during the morning commute. Expect reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory means that periods of snow, sleet or freezing rain will cause travel difficulties. Expect slippery roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MNZ080-081-089-090-097-098-181600- /O.CON.KFSD.WW.Y.0020.180418T0900Z-180419T0000Z/ Murray-Cottonwood-Nobles-Jackson-Pipestone-Rock- 259 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Snow expected. Total snow accumulations of 2 to 5 inches are expected, with locally higher amounts possible toward the Interstate 90 corridor. * WHERE...Portions of southwest Minnesota. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on slippery road conditions, including during the morning commute. Expect reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
3 follow-up statements
297 WWUS43 KFSD 181640 WSWFSD URGENT - WINTER WEATHER MESSAGE National Weather Service Sioux Falls SD 1140 AM CDT Wed Apr 18 2018 MNZ089-090-190000- /O.UPG.KFSD.WW.Y.0020.000000T0000Z-180419T0000Z/ /O.EXA.KFSD.WS.W.0007.000000T0000Z-180419T0000Z/ Nobles-Jackson- 1140 AM CDT Wed Apr 18 2018 ...WINTER STORM WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Heavy snow. Total snow accumulations of 6 to 9 inches are expected. * WHERE...Nobles and Jackson Counties. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Expect significant reductions in visibility at times. Accumulating snow will continue into the early evening hours. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IAZ002-003-013-014-021-022-190000- /O.CON.KFSD.WS.W.0007.000000T0000Z-180419T0000Z/ Osceola-Dickinson-O'Brien-Clay IA-Cherokee-Buena Vista- 1140 AM CDT Wed Apr 18 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Heavy snow. Total snow accumulations of 6 to 9 inches are expected. * WHERE...Portions of northwest Iowa. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Expect significant reductions in visibility at times. Accumulating snow will continue through the afternoon and possibly into the early evening. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ SDZ050-052-057>059-063>065-068>071-181800- /O.CON.KFSD.WW.Y.0020.000000T0000Z-180418T1800Z/ Gregory-Jerauld-Brule-Aurora-Davison-Charles Mix-Douglas- Hutchinson-Bon Homme-Yankton-Clay SD-Union- 1140 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 PM CDT THIS AFTERNOON... * WHAT...Snow. Total snow accumulations of 5 to 8 inches are expected. Locally heavier amounts are possible especially in higher terrained area. * WHERE...Portions of central, south central and southeast South Dakota. * WHEN...Until 1 PM CDT this afternoon. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Expect reduced visibilities. Accumulating snow will rapidly diminish through the afternoon hours. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ SDZ060>062-066-067-182100- /O.CON.KFSD.WW.Y.0020.000000T0000Z-180418T2100Z/ Hanson-McCook-Minnehaha-Turner-Lincoln SD- 1140 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 PM CDT THIS AFTERNOON... * WHAT...Snow. Total snow accumulations of 5 to 8 inches are expected. Locally higher amounts may be possible especially in the higher terrained areas. * WHERE...Hanson, McCook, Minnehaha, Turner and Lincoln SD Counties. * WHEN...Until 4 PM CDT this afternoon. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Expect reduced visibilities. Accumulating snow will rapidly diminish toward mid afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IAZ001-012-190000- /O.CON.KFSD.WW.Y.0021.000000T0000Z-180419T0000Z/ Lyon IA-Sioux- 1140 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Snow. Total snow accumulations of 5 to 8 inches are expected. Locally higher amounts are possible especially in the higher terrained areas. * WHERE...Lyon IA and Sioux Counties. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Expect reduced visibilities. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MNZ098-190000- /O.CON.KFSD.WW.Y.0020.000000T0000Z-180419T0000Z/ Rock- 1140 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Snow. Total snow accumulations of 5 to 8 inches are expected. * WHERE...Rock County. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Expect reduced visibilities. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MNZ080-081-097-190000- /O.CON.KFSD.WW.Y.0020.000000T0000Z-180419T0000Z/ Murray-Cottonwood-Pipestone- 1140 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Snow. Total snow accumulations of 2 to 5 inches are expected with the higher amounts approaching Interstate 90. * WHERE...Murray, Cottonwood and Pipestone Counties. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on slick road conditions. Expect reduced visibilities. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ SDZ053>056-182100- /O.CON.KFSD.WW.Y.0020.000000T0000Z-180418T2100Z/ Sanborn-Miner-Lake-Moody- 1140 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 PM CDT THIS AFTERNOON... * WHAT...Snow. Total snow accumulations of 2 to 5 inches are expected with the higher amounts approaching Interstate 90. * WHERE...Sanborn, Miner, Lake and Moody Counties. * WHEN...Until 4 PM CDT this afternoon. * ADDITIONAL DETAILS...Plan on slick road conditions. Expect reduced visibilities. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IAZ020-032-182100- /O.CON.KFSD.WW.Y.0020.000000T0000Z-180418T2100Z/ Plymouth-Ida- 1140 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 PM CDT THIS AFTERNOON... * WHAT...Snow. Total snow accumulations of 3 to 6 inches are expected. Locally heavier amounts are possible in northern Plymouth county. * WHERE...Plymouth and Ida Counties. * WHEN...Until 4 PM CDT this afternoon. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Expect reduced visibilities. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IAZ031-NEZ013-014-181800- /O.CON.KFSD.WW.Y.0020.000000T0000Z-180418T1800Z/ Woodbury-Dixon-Dakota- 1140 AM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 PM CDT THIS AFTERNOON... * WHAT...Snow. Total snow accumulations of 2 to 4 inches are expected. * WHERE...In Nebraska, Dixon and Dakota Counties. In Iowa, Woodbury County. * WHEN...Until 1 PM CDT this afternoon. * ADDITIONAL DETAILS...Plan on slippery road conditions. Expect reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
475 WWUS43 KFSD 182007 WSWFSD URGENT - WINTER WEATHER MESSAGE National Weather Service Sioux Falls SD 307 PM CDT Wed Apr 18 2018 IAZ020-032-SDZ053>056-060>062-066-067-182115- /O.CAN.KFSD.WW.Y.0020.000000T0000Z-180418T2100Z/ Plymouth-Ida-Sanborn-Miner-Lake-Moody-Hanson-McCook-Minnehaha- Turner-Lincoln SD- 307 PM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY IS CANCELLED... Some flurries or sprinkles may linger late this afternoon, but accumulating snow is over. Be alert for slippery road conditions on the afternoon commute from work or school. $$ IAZ002-003-013-014-021-022-190000- /O.CON.KFSD.WS.W.0007.000000T0000Z-180419T0000Z/ Osceola-Dickinson-O'Brien-Clay IA-Cherokee-Buena Vista- 307 PM CDT Wed Apr 18 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Diminishing snow. Additional snow accumulations of inch or less. * WHERE...Portions of northwest Iowa. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on difficult travel conditions, including during the evening commute. Expect reductions in visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MNZ089-090-190000- /O.CON.KFSD.WS.W.0007.000000T0000Z-180419T0000Z/ Nobles-Jackson- 307 PM CDT Wed Apr 18 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Diminishing snow. Additional snow accumulations of an inch or less. * WHERE...Nobles and Jackson Counties. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on difficult travel conditions, including during the evening commute. Expect reductions in visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions will make travel very hazardous or impossible. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IAZ001-012-190000- /O.CON.KFSD.WW.Y.0021.000000T0000Z-180419T0000Z/ Lyon IA-Sioux- 307 PM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Diminishing snow. Additional snow accumulations of less than an inch. * WHERE...Lyon IA and Sioux Counties. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on slippery road conditions, including during the evening commute. Expect reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MNZ098-190000- /O.CON.KFSD.WW.Y.0020.000000T0000Z-180419T0000Z/ Rock- 307 PM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Diminishing snow. Additional snow accumulations of less than an inch. * WHERE...Rock County. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on slippery road conditions, including during the evening commute. Expect reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MNZ080-081-097-190000- /O.CON.KFSD.WW.Y.0020.000000T0000Z-180419T0000Z/ Murray-Cottonwood-Pipestone- 307 PM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING... * WHAT...Diminishing snow. Additional snow accumulations of less than an inch. * WHERE...Murray, Cottonwood and Pipestone Counties. * WHEN...Until 7 PM CDT this evening. * ADDITIONAL DETAILS...Plan on slippery road conditions, including during the evening commute. Expect reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
061 WWUS43 KFSD 182244 WSWFSD URGENT - WINTER WEATHER MESSAGE National Weather Service Sioux Falls SD 544 PM CDT Wed Apr 18 2018 IAZ002-003-013-014-021-022-MNZ089-090-182345- /O.CAN.KFSD.WS.W.0007.000000T0000Z-180419T0000Z/ Osceola-Dickinson-O'Brien-Clay IA-Cherokee-Buena Vista-Nobles- Jackson- 544 PM CDT Wed Apr 18 2018 ...WINTER STORM WARNING IS CANCELLED... Light snow or flurries will continue through the early evening, however little to no additional accumulation is expected. Therefore the winter storm warning is cancelled. $$ IAZ001-012-182345- /O.CAN.KFSD.WW.Y.0021.000000T0000Z-180419T0000Z/ Lyon IA-Sioux- 544 PM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY IS CANCELLED... Light snow or flurries will continue through the early evening, however little to no additional accumulation is expected. Therefore the winter weather advisory is cancelled. $$ MNZ080-081-097-098-182345- /O.CAN.KFSD.WW.Y.0020.000000T0000Z-180419T0000Z/ Murray-Cottonwood-Pipestone-Rock- 544 PM CDT Wed Apr 18 2018 ...WINTER WEATHER ADVISORY IS CANCELLED... Light snow or flurries will continue through the early evening, however little to no additional accumulation is expected. Therefore the winter weather advisory is cancelled. $$
What forecasters said that day
The local office's own words before this winter weather advisory went out, 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 this winter weather advisory went out at Apr 17, 9:34 PM CDT, 5 hours 25 minutes earlier.
Area forecast discussion, Apr 17, 9:34 PM CDT, 5 hours 25 minutes before
Area Forecast Discussion
National Weather Service Sioux Falls SD
934 PM CDT Tue Apr 17 2018
.UPDATE...
Issued at 918 PM CDT Tue Apr 17 2018
HRRR. RAP, NAMnest, and 00z NAM continue to trend further south
with the approaching shortwave trough. This is supported by the
present location of the trough seen on water vapor. Strong jet
streak and PV anomaly is digging across southwest Nebraska near
the Kansas border, on an eastward track this evening. With the
stronger forcing likewise tracking further south, remaining near
or south of the mid- Missouri valley, have adjusted precipitation
amounts lower in the highway 14 corridor of east central, while
the lower Brule area of south central SD have trended slightly
higher. While this has not altered expected snowfall amounts
significantly, it does bring Gregory county into the 2 to 4 inch
range, so have added them to the advisory. Beadle, Kingsbury,
Sanborn and Jerauld may struggle to reach 2 inches, but given that
they are already in the advisory, did not want to remove them at
this point.
&&
.SHORT TERM...(This evening through Wednesday night)
Issued at 349 PM CDT Tue Apr 17 2018
Current surface analysis shows weak high pressure situated over
Minnesota. Aloft, an upper trough is moving rapidly eastward into
western plains. Another round of snowfall is taking aim across the
area. The upper trough will move into central Nebraska overnight,
before closing off and heading into Iowa on Wednesday. Strong jet
streak of over 100 knots is noted tonight rounding the base of the
upper low near the Nebraska/Kansas border, with a subtle streak
extending northward up the MO River valley of NE/IA. Lift becomes
quite strong with low level moisture increasing rapidly from west to
east tonight. That said, it will take a while for southwest MN to
saturate up so slowed down measurable pops in that area. Between 06Z
and 12Z, very high pops continue to be warranted as they progress
eastward with the deep layer saturation. There is dendricity in the
3-5km layer, and lift is quite strong in this layer between -10 and
-20C. Isentropic lift is strong in the 285-295K layer. Furthermore,
some instability exists in the mid layers late tonight and very
early Wednesday in the Sioux City and Storm Lake areas evidenced by
elevated cape values.
For the details, the models are fairly close with the timing of the
dynamics, moisture, and overall QPF values. The mid level QG forcing
moves squarely over the CWA. There may be a little wintry mix for
locations in extreme northeast NE, extending eastward to Sioux City
and Storm Lake initially overnight tonight before the mid layers
saturate up. But overall the models are under doing the ice
probability function and not introducing snow fast enough as the
profile becomes so deeply saturated. Worried about a bit of a
convective snow burst especially around Storm Lake. Will have to
watch this location for any sort of headline upgrades, because if
they do go convective late tonight or early Wednesday, snow rates
could be an inch an hour for a few hours. This will push Storm
Lake's snow amount over 6 inches. Conversely due to the track of the
system and the main frontal forcing over our southern zones, our
northern and western zones may receive less snowfall then originally
forecast at about 2 inches, perhaps a bit more. Overall elsewhere, 3
to 5 inches of snow looks like a pretty good bet blending the QPF
off of the various cams, and lowering the snow ratio from what
superblend was giving us. Unlike last weekend, fortunately this will
not be an overly wind driven event. But did increase wind speeds
generally from about I 29 and eastward due to the amount of wind at
925mb and gradient expected. So therefore preferred winds in the
breezy category. Most of the visibility reduction in this event will
be due to falling snow and not blowing snow.
Snow streaks are possible Wednesday afternoon west of I 29 due to
cold air aloft and a cyclonic flow. Further east, high pops will
diminish in the evening east of I 29 as the system moves out of the
area. Concerning temperatures, needless to say they will continue to
be immensely below normal for the daytime high on Wednesday, with
readings only in the 30s to around 40 degrees.
.LONG TERM...(Thursday through Tuesday)
Issued at 349 PM CDT Tue Apr 17 2018
On Thursday and Friday, another upper level low will move into the
southwest United States, with our area dominated by an upper ridge
of high pressure. Sprawling surface high pressure will nudge ever so
slowly eastward, setting up shop over the MS valley and Great Lakes
area on Friday and Saturday. This is important as this high will
usher in a low level fetch of dry air from the east, limiting our
pops as the upper low moves closer on Friday and Friday night. Then
on the weekend, the closed upper low tracks too far south to impact
our weather this weekend. Further out on Monday night and Tuesday,
small pops are warranted with a frontal passage coming down from the
north.
In terms of temperatures, Thursday and Friday will continue to be
well above normal, followed by temperatures closer to normal this
weekend. Warmed up highs on Sunday west of I 29 given the 925-900mb
temperature structure over superblend values. Early next week,
temperatures will be a bit cooler on Tuesday when compared to
Monday as the next frontal passage dips southward.
&&
.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
Issued at 636 PM CDT Tue Apr 17 2018
Ceilings will begin lowering late this evening, with light rain
or a wintry mix arriving in south central and Missouri Valley
around midnight. The rain or wintry mix will quickly change to
entirely snow in the early morning hours as it spreads eastward.
Expect widespread MVFR and IFR conditions, with brief LIFR in the
heavier snow bands. Winds will not be extreme, but should average
around 10 to 25 KT during snowfall. Visibility will begin
improving after 15z, but low stratus persists through the TAF
period.
&&
.FSD WATCHES/WARNINGS/ADVISORIES...
SD...Winter Weather Advisory from 1 AM to 4 PM CDT Wednesday for
SDZ038-039-053>055-060>062-066-067-070-071.
Winter Weather Advisory from 1 AM to 1 PM CDT Wednesday for
SDZ050-052-057>059-063>065-068-069.
Winter Weather Advisory from 4 AM to 7 PM CDT Wednesday for
SDZ040-056.
MN...Winter Weather Advisory from 4 AM to 7 PM CDT Wednesday for
MNZ071-072-080-081-089-090-097-098.
IA...Winter Weather Advisory from 1 AM to 4 PM CDT Wednesday for
IAZ001-012-020>022-031-032.
Winter Weather Advisory from 4 AM to 7 PM CDT Wednesday for
IAZ002-003-013-014.
NE...Winter Weather Advisory from 1 AM to 4 PM CDT Wednesday for
NEZ014.
Winter Weather Advisory from 1 AM to 1 PM CDT Wednesday for
NEZ013.
&&
UPDATE...
SHORT TERM...MJ
LONG TERM...MJ
AVIATION...Hazardous weather outlook, Apr 17, 4:21 AM CDT, 22 hours 38 minutes before
Hazardous Weather Outlook National Weather Service Sioux Falls SD 421 AM CDT Tue Apr 17 2018 IAZ001-012-020-021-031-032-MNZ071-072-097-098-NEZ013-014- SDZ038>040-052>056-058>062-065>067-069>071-180930- Lyon IA-Sioux-Plymouth-Cherokee-Woodbury-Ida-Lincoln MN-Lyon MN- Pipestone-Rock-Dixon-Dakota-Beadle-Kingsbury-Brookings-Jerauld- Sanborn-Miner-Lake-Moody-Aurora-Davison-Hanson-McCook-Minnehaha- Hutchinson-Turner-Lincoln SD-Yankton-Clay SD-Union- 421 AM CDT Tue Apr 17 2018 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...Today and Tonight Fog will be possible through mid morning, areas of locally dense fog may be possible near the Buffalo Ridge areas of eastern South Dakota and Southwest Minnesota. A light wintry mix of snow, sleet or freezing rain will arrive after midnight tonight, with a quick transition to snow expected before the pre-dawn hours. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Moderate snow will move through the outlook area during the morning commute, ending during the early afternoon hours. Total accumulations of 2 to 5 inches of snow will be possible, with very minimal accumulations of sleet and ice. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. IAZ002-003-013-014-022-MNZ080-081-089-090-180930- Osceola-Dickinson-O'Brien-Clay IA-Buena Vista-Murray-Cottonwood- Nobles-Jackson- 421 AM CDT Tue Apr 17 2018 This Hazardous Weather Outlook is for portions of northwest Iowa and southwest Minnesota. .DAY ONE...Today and Tonight Fog will be possible through mid morning, areas of locally dense fog may be possible near the Buffalo Ridge areas of eastern South Dakota and Southwest Minnesota. A light wintry mix of snow, sleet or freezing rain will arrive after 3am tonight, with a quick transition to snow expected. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Moderate snow will move through the outlook area during the morning commute, ending during the afternoon hours. Total accumulations of 3 to 6 inches of snow an isolated 7 inch reports will be possible. Sleet and freezing rain accumulations will be minimal. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. SDZ050-057-063-064-068-180930- Gregory-Brule-Charles Mix-Douglas-Bon Homme- 421 AM CDT Tue Apr 17 2018 This Hazardous Weather Outlook is for portions of south central South Dakota and southeast South Dakota. .DAY ONE...Today and Tonight A light wintry mix of snow, sleet or freezing rain will arrive by midnight tonight, with a quick transition to snow expected. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Moderate snow will move through the outlook area during the morning commute, ending by mid morning. Total accumulations of 1 to 3 inches of snow will be possible. Sleet and freezing rain accumulations will be minimal. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 2:59 AM CDT | Winter Storm Warning | FSD | Buena Vista, Cherokee, Clay, Dickinson, O'Brien, Osceola | 15 hr |
| Apr 18, 10:02 AM CDT | River Flood Warning | FSD | Lyon | 7 days |
| Apr 18, 10:02 AM CDT | River Flood Warning | FSD | Clay | 7 days |
| Apr 18, 10:02 AM CDT | River Flood Warning | FSD | Cherokee | 3 days |
Nearby
Winter Weather Advisories in Iowa, 2018Every winter weather advisory in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.