Alert archive / Iowa / Wind Chill Advisories in 2018
Wind Chill Advisory 3, NWS Des Moines, IA
NWS Des Moines, IA issued this wind chill advisory at Jan 11, 2018, 2:24 PM CST for 26 counties in Iowa. It took effect at Jan 11, 2018, 9:00 PM CST. It was in force for 13 hr.
The area
The counties it named.
The facts
- Issued
- Jan 11, 2018, 2:24 PM CST (20:24 UTC)
- In effect from
- Jan 11, 2018, 9:00 PM CST
- Expired
- Jan 12, 2018, 10:00 AM CST
- In force
- 13 hr
- Issued by
- NWS Des Moines, IA
All 26 counties
Black Hawk County, IA, Boone County, IA, Bremer County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Emmet County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Kossuth County, IA, Marshall County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Story County, IA, Tama County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 99 km from the middle of the area, began a volume at 20:28 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
Minneapolis, MN (KMPX), launched 12:00Z, 8.4 hours before the alert went out and 248 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
- 1 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 530 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 229 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
855 WWUS43 KDMX 112024 WSWDMX URGENT - WINTER WEATHER MESSAGE National Weather Service Des Moines IA 224 PM CST Thu Jan 11 2018 ...Areas of Light Snow Moving over Central Iowa with Bitter Cold Wind Chills Tonight into Friday Morning Over North Central Iowa... .Areas of light snow continue to move to the northeast over central and eastern Iowa at mid-afternoon. Winds from the northwest are averaging between 20 to 30 mph with higher gusts causing blowing snow and reduced visibilities at times. Snow has mostly ended for areas west of Highway 71 and will end elsewhere across central Iowa this afternoon. The combination of the winds and very cold air will create dangerous wind chills tonight into Friday morning over north central Iowa. IAZ007-016-017-024>026-034>037-120430- /O.CAN.KDMX.WS.W.0001.000000T0000Z-180112T0000Z/ /O.NEW.KDMX.WC.Y.0003.180112T0300Z-180112T1600Z/ /O.EXA.KDMX.WW.Y.0002.000000T0000Z-180112T0000Z/ Worth-Hancock-Cerro Gordo-Humboldt-Wright-Franklin-Calhoun- Webster-Hamilton-Hardin- Including the cities of Northwood, Manly, Garner, Britt, Kanawha, Mason City, Clear Lake, Humboldt, Eagle Grove, Clarion, Belmond, Hampton, Rockwell City, Manson, Lake City, Pomeroy, Fort Dodge, Webster City, Iowa Falls, Eldora, and Ackley 224 PM CST Thu Jan 11 2018 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM CST THIS EVENING... ...WIND CHILL ADVISORY IN EFFECT FROM 9 PM THIS EVENING TO 10 AM CST FRIDAY... ...WINTER STORM WARNING IS CANCELLED... * WHAT...Areas of light snow occurring. Very cold wind chills expected. Plan on slippery road conditions, including during the evening commute. Additional snow accumulations of up to one inch is expected. Expect wind chills to range from 20 below zero to near 30 below zero. * WHERE...Parts of North Central Iowa. * WHEN...For the Winter Weather Advisory, until 6 PM today. For the Wind Chill Advisory, 9 PM this evening to 10 AM Friday. * ADDITIONAL DETAILS...Winds gusting as high as 40 mph will cause areas of blowing and drifting snow with visibility reduction below one half mile possible. The cold wind chills will cause frostbite in as little as 30 minutes to exposed skin. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for 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. A Wind Chill Advisory means that cold air and the wind will combine to create low wind chills. Frost bite and hypothermia can occur if precautions are not taken. Make sure you wear a hat and gloves. $$ IAZ045>047-057>059-070-071-120000- /O.CAN.KDMX.WS.W.0001.000000T0000Z-180112T0000Z/ /O.EXA.KDMX.WW.Y.0002.000000T0000Z-180112T0000Z/ Carroll-Greene-Boone-Audubon-Guthrie-Dallas-Cass-Adair- Including the cities of Carroll, Jefferson, Boone, Audubon, Exira, Guthrie Center, Panora, Bayard, Casey, Perry, Waukee, Adel, Atlantic, Greenfield, Stuart, Adair, and Fontanelle 224 PM CST Thu Jan 11 2018 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM CST THIS EVENING... ...WINTER STORM WARNING IS CANCELLED... * WHAT...Light snow ending. Plan on slippery road conditions, including during the evening commute. Additional snow accumulations of less than an inch are expected. * WHERE...Parts of central Iowa. * WHEN...Until 6 PM today. * ADDITIONAL DETAILS...Winds gusting as high as 40 mph will cause areas of blowing and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. $$ IAZ027-028-038-120430- /O.NEW.KDMX.WC.Y.0003.180112T0300Z-180112T1600Z/ /O.CON.KDMX.WW.Y.0002.000000T0000Z-180112T0000Z/ Butler-Bremer-Grundy- Including the cities of Parkersburg, Clarksville, Shell Rock, Greene, Aplington, Allison, Dumont, Waverly, Grundy Center, Reinbeck, Conrad, Dike, and Wellsburg 224 PM CST Thu Jan 11 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM CST THIS EVENING... ...WIND CHILL ADVISORY IN EFFECT FROM 9 PM THIS EVENING TO 10 AM CST FRIDAY... * WHAT...Occasional light snow occurring. Plan on slippery road conditions, including during the evening commute. Additional snow accumulations of up to one inch are expected. Very cold wind chills expected. Expect wind chills to range from 15 below zero to 25 below zero. * WHERE...Butler, Bremer, and Grundy Counties. * WHEN...For the Winter Weather Advisory, until 6 PM today. For the Wind Chill Advisory, 9 PM this evening to 10 AM Friday. * ADDITIONAL DETAILS...Winds may gust as high as 35 mph this afternoon. Be prepared for reduced visibilities at times due to blowing snow. The cold wind chills will cause frostbite in as little as 30 minutes to exposed skin. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for 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. A Wind Chill Advisory means that cold air and the wind will combine to create low wind chills. Frost bite and hypothermia can occur if precautions are not taken. Make sure you wear a hat and gloves. $$ IAZ004>006-015-023-033-120430- /O.NEW.KDMX.WC.Y.0003.180112T0300Z-180112T1600Z/ /O.CON.KDMX.WW.Y.0002.000000T0000Z-180112T0000Z/ Emmet-Kossuth-Winnebago-Palo Alto-Pocahontas-Sac- Including the cities of Estherville, Algona, Forest City, Lake Mills, Emmetsburg, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Sac City, Lake View, Odebolt, Wall Lake, Schaller, and Early 224 PM CST Thu Jan 11 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM CST THIS EVENING... ...WIND CHILL ADVISORY IN EFFECT FROM 9 PM THIS EVENING TO 10 AM CST FRIDAY... * WHAT...Light snow ending. Plan on slippery road conditions, including during the evening commute. Additional snow accumulations of less than one inch are expected. Very cold wind chills expected. Expect wind chills to range from 20 below zero to 30 below zero. * WHERE...Parts of Northwest and North Central Iowa. * WHEN...For the Winter Weather Advisory, until 6 PM today. For the Wind Chill Advisory, 9 PM this evening to 10 AM Friday. * ADDITIONAL DETAILS...Winds gusting as high as 40 mph will cause areas of blowing and drifting snow. Be prepared for reduced visibilities at times. The cold wind chills will cause frostbite in as little as 30 minutes to exposed skin. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. A Wind Chill Advisory means that cold air and the wind will combine to create low wind chills. Frost bite and hypothermia can occur if precautions are not taken. Make sure you wear a hat and gloves. $$ IAZ039-048>050-060>062-072>075-081>086-092>097-120000- /O.CON.KDMX.WW.Y.0002.000000T0000Z-180112T0000Z/ Black Hawk-Story-Marshall-Tama-Polk-Jasper-Poweshiek-Madison- Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas-Monroe-Wapello- Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- Including the cities of Waterloo, Cedar Falls, Ames, Marshalltown, Tama, Toledo, Traer, Dysart, Gladbrook, Des Moines, Newton, Grinnell, Winterset, Earlham, Indianola, Norwalk, Carlisle, Pella, Knoxville, Oskaloosa, Corning, Creston, Osceola, Chariton, Albia, Ottumwa, Bedford, Lenox, New Market, Mount Ayr, Lamoni, Leon, Corydon, Seymour, Allerton, Humeston, Centerville, and Bloomfield 224 PM CST Thu Jan 11 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM CST THIS EVENING... * WHAT...Areas of light snow occurring. Plan on slippery road conditions, including during the evening commute. Additional snow accumulations of up to one inch are expected. * WHERE...Southern into central and northeast Iowa. * WHEN...Until 6 PM today. * ADDITIONAL DETAILS...Winds may gust as high as 30 mph this afternoon. Be prepared for reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for 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. $$ IAZ044-120000- /O.CON.KDMX.WW.Y.0002.000000T0000Z-180112T0000Z/ Crawford- Including the city of Denison 224 PM CST Thu Jan 11 2018 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM CST THIS EVENING... * WHAT...Snow occurring. Plan on slippery road conditions, including during the evening commute. Additional snow accumulations of up to one inch are expected. * WHERE...Crawford County. * WHEN...Until 6 PM today. * ADDITIONAL DETAILS...Winds gusting as high as 35 mph will cause areas of blowing and drifting snow. Cold wind chills as low as 20 below zero will cause frostbite in as little as 30 minutes to exposed skin. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. $$ For more information from the National Weather Service visit http://weather.gov/desmoines Ansorge
5 follow-up statements
333 WWUS43 KDMX 120012 WSWDMX URGENT - WINTER WEATHER MESSAGE National Weather Service Des Moines IA 612 PM CST Thu Jan 11 2018 ...Snow and Blowing Snow Ending, but Bitter Cold Wind Chills Tonight into Friday Morning Over North Central Iowa... .Brisk northwest winds will still produce areas of minor blowing snow in rural and open areas early this evening, but conditions should gradually improve as winds slowly diminish. Thus the Winter Weather Advisory has been allowed to expire. The brisk winds will still combine with very cold air and create dangerous wind chills tonight into Friday morning over north central Iowa however. IAZ004>007-015>017-023>028-033>038-120815- /O.EXP.KDMX.WW.Y.0002.000000T0000Z-180112T0000Z/ /O.CON.KDMX.WC.Y.0003.180112T0300Z-180112T1600Z/ Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun- Webster-Hamilton-Hardin-Grundy- Including the cities of Estherville, Algona, Forest City, Lake Mills, Northwood, Manly, Emmetsburg, Garner, Britt, Kanawha, Mason City, Clear Lake, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Humboldt, Eagle Grove, Clarion, Belmond, Hampton, Parkersburg, Clarksville, Shell Rock, Greene, Aplington, Allison, Dumont, Waverly, Sac City, Lake View, Odebolt, Wall Lake, Schaller, Early, Rockwell City, Manson, Lake City, Pomeroy, Fort Dodge, Webster City, Iowa Falls, Eldora, Ackley, Grundy Center, Reinbeck, Conrad, Dike, and Wellsburg 612 PM CST Thu Jan 11 2018 ...WIND CHILL ADVISORY REMAINS IN EFFECT FROM 9 PM THIS EVENING TO 10 AM CST FRIDAY... ...WINTER WEATHER ADVISORY HAS EXPIRED... * WHAT...Light snow and blowing snow ending. Plan on scattered slick spots and minor blowing snow in rural and open areas, including during the tail end of the evening commute. Blowing snow should diminish during the early evening hours however. Very cold wind chills also expected. Expect wind chills to range from 20 below zero to 30 below zero. * WHERE...Parts of Northwest and North Central Iowa. * WHEN...Winter Weather Advisory has expired, but the Wind Chill Advisory continues from 9 PM this evening to 10 AM Friday. * ADDITIONAL DETAILS...The cold wind chills may cause frostbite in as little as 30 minutes to exposed skin. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Chill Advisory means that cold air and the wind will combine to create low wind chills. Frost bite and hypothermia can occur if precautions are not taken. Make sure you wear a hat and gloves. $$ IAZ039-044>050-057>062-070>075-081>086-092>097-120115- /O.EXP.KDMX.WW.Y.0002.000000T0000Z-180112T0000Z/ Black Hawk-Crawford-Carroll-Greene-Boone-Story-Marshall-Tama- Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass-Adair-Madison- Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas-Monroe-Wapello- Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- Including the cities of Waterloo, Cedar Falls, Denison, Carroll, Jefferson, Boone, Ames, Marshalltown, Tama, Toledo, Traer, Dysart, Gladbrook, Audubon, Exira, Guthrie Center, Panora, Bayard, Casey, Perry, Waukee, Adel, Des Moines, Newton, Grinnell, Atlantic, Greenfield, Stuart, Adair, Fontanelle, Winterset, Earlham, Indianola, Norwalk, Carlisle, Pella, Knoxville, Oskaloosa, Corning, Creston, Osceola, Chariton, Albia, Ottumwa, Bedford, Lenox, New Market, Mount Ayr, Lamoni, Leon, Corydon, Seymour, Allerton, Humeston, Centerville, and Bloomfield 612 PM CST Thu Jan 11 2018 ...WINTER WEATHER ADVISORY HAS EXPIRED... Brisk northwest winds will still produce areas of minor blowing snow in rural and open areas early this evening, but conditions should gradually improve as winds slowly diminish. Thus the Winter Weather Advisory has been allowed to expire. Many roads remain partially covered in snow or ice however from previous precipitation, so caution is still advised with travel overnight. $$ For more information from the National Weather Service visit http://weather.gov/desmoines Small
193 WWUS43 KDMX 120335 WSWDMX URGENT - WINTER WEATHER MESSAGE National Weather Service Des Moines IA 935 PM CST Thu Jan 11 2018 ...Bitter Cold Wind Chills Tonight into Friday Morning Over North Central Iowa... .Brisk winds will combine with very cold air and create dangerous wind chills into Friday morning over north central Iowa. IAZ004>007-015>017-023>028-033>038-121030- /O.CON.KDMX.WC.Y.0003.000000T0000Z-180112T1600Z/ Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun- Webster-Hamilton-Hardin-Grundy- Including the cities of Estherville, Algona, Forest City, Lake Mills, Northwood, Manly, Emmetsburg, Garner, Britt, Kanawha, Mason City, Clear Lake, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Humboldt, Eagle Grove, Clarion, Belmond, Hampton, Parkersburg, Clarksville, Shell Rock, Greene, Aplington, Allison, Dumont, Waverly, Sac City, Lake View, Odebolt, Wall Lake, Schaller, Early, Rockwell City, Manson, Lake City, Pomeroy, Fort Dodge, Webster City, Iowa Falls, Eldora, Ackley, Grundy Center, Reinbeck, Conrad, Dike, and Wellsburg 935 PM CST Thu Jan 11 2018 ...WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL 10 AM CST FRIDAY... * WHAT...Very cold wind chills expected. The cold wind chills may cause frostbite in as little as 30 minutes to exposed skin. Expect wind chills to range from 15 below zero to 25 below zero. * WHERE...Parts of Northwest and North Central Iowa. * WHEN...Now to 10 AM Friday. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Chill Advisory means that cold air and the wind will combine to create low wind chills. Frost bite and hypothermia can occur if precautions are not taken. Make sure you wear a hat and gloves. $$ For more information from the National Weather Service visit http://weather.gov/desmoines Small
578 WWUS43 KDMX 120931 WSWDMX URGENT - WINTER WEATHER MESSAGE National Weather Service Des Moines IA 331 AM CST Fri Jan 12 2018 ...Bitter Cold Wind Chills Continue this Morning Over North Central Iowa... .Brisk winds and very cold temperatures will combine to create dangerous wind chills this morning over north central Iowa. Conditions will improve between 10 am and noon today. Another night of bitter cold will occur tonight over much of the same region. More information will be available later today regarding the counties expected to be affected. IAZ004>007-015>017-023>028-033>038-121600- /O.CON.KDMX.WC.Y.0003.000000T0000Z-180112T1600Z/ Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun- Webster-Hamilton-Hardin-Grundy- Including the cities of Estherville, Algona, Forest City, Lake Mills, Northwood, Manly, Emmetsburg, Garner, Britt, Kanawha, Mason City, Clear Lake, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Humboldt, Eagle Grove, Clarion, Belmond, Hampton, Parkersburg, Clarksville, Shell Rock, Greene, Aplington, Allison, Dumont, Waverly, Sac City, Lake View, Odebolt, Wall Lake, Schaller, Early, Rockwell City, Manson, Lake City, Pomeroy, Fort Dodge, Webster City, Iowa Falls, Eldora, Ackley, Grundy Center, Reinbeck, Conrad, Dike, and Wellsburg 331 AM CST Fri Jan 12 2018 ...WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL 10 AM CST THIS MORNING... * WHAT...Very cold wind chills expected. The cold wind chills will cause frostbite in as little as 30 minutes to exposed skin. Expect wind chills to range from 20 below zero to 30 below zero. * WHERE...Parts of Northwest and North Central Iowa. * WHEN...Now to 10 AM this morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Chill Advisory means that cold air and the wind will combine to create low wind chills. Frost bite and hypothermia can occur if precautions are not taken. Make sure you wear a hat and gloves. $$ For more information from the National Weather Service visit http://weather.gov/desmoines
158 WWUS43 KDMX 121043 WSWDMX URGENT - WINTER WEATHER MESSAGE National Weather Service Des Moines IA 443 AM CST Fri Jan 12 2018 ...Bitter Cold Wind Chills Continue this Morning Over North Central Iowa... .Brisk winds and very cold temperatures will combine to create dangerous wind chills this morning over north central Iowa. Conditions will improve between 10 am and noon today. Another night of bitter cold will occur tonight over much of the same region. More information will be available later today regarding the counties expected to be affected. IAZ039-045>050-121600- /O.EXA.KDMX.WC.Y.0003.000000T0000Z-180112T1600Z/ Black Hawk-Carroll-Greene-Boone-Story-Marshall-Tama- Including the cities of Waterloo, Cedar Falls, Carroll, Jefferson, Boone, Ames, Marshalltown, Tama, Toledo, Traer, Dysart, and Gladbrook 443 AM CST Fri Jan 12 2018 ...WIND CHILL ADVISORY IN EFFECT UNTIL 10 AM CST THIS MORNING... * WHAT...Very cold wind chills expected. The cold wind chills will cause frostbite in as little as 30 minutes to exposed skin. Expect wind chills to range from 20 below zero to 25 below zero for the remainder of this morning. * WHERE...Portions of Central Iowa * WHEN...Now to 10 AM this morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Chill Advisory means that cold air and the wind will combine to create low wind chills. Frost bite and hypothermia can occur if precautions are not taken. Make sure you wear a hat and gloves. $$ IAZ004>007-015>017-023>028-033>038-121600- /O.CON.KDMX.WC.Y.0003.000000T0000Z-180112T1600Z/ Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun- Webster-Hamilton-Hardin-Grundy- Including the cities of Estherville, Algona, Forest City, Lake Mills, Northwood, Manly, Emmetsburg, Garner, Britt, Kanawha, Mason City, Clear Lake, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Humboldt, Eagle Grove, Clarion, Belmond, Hampton, Parkersburg, Clarksville, Shell Rock, Greene, Aplington, Allison, Dumont, Waverly, Sac City, Lake View, Odebolt, Wall Lake, Schaller, Early, Rockwell City, Manson, Lake City, Pomeroy, Fort Dodge, Webster City, Iowa Falls, Eldora, Ackley, Grundy Center, Reinbeck, Conrad, Dike, and Wellsburg 443 AM CST Fri Jan 12 2018 ...WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL 10 AM CST THIS MORNING... * WHAT...Very cold wind chills expected. The cold wind chills will cause frostbite in as little as 30 minutes to exposed skin. Expect wind chills to range from 20 below zero to 30 below zero. * WHERE...Parts of Northwest and North Central Iowa. * WHEN...Now to 10 AM this morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Wind Chill Advisory means that cold air and the wind will combine to create low wind chills. Frost bite and hypothermia can occur if precautions are not taken. Make sure you wear a hat and gloves. $$ For more information from the National Weather Service visit http://weather.gov/desmoines
400 WWUS43 KDMX 121559 WSWDMX URGENT - WINTER WEATHER MESSAGE National Weather Service Des Moines IA 959 AM CST Fri Jan 12 2018 ...Wind Chills Improving this Morning... IAZ004>007-015>017-023>028-033>039-045>050-121700- /O.EXP.KDMX.WC.Y.0003.000000T0000Z-180112T1600Z/ Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun- Webster-Hamilton-Hardin-Grundy-Black Hawk-Carroll-Greene-Boone- Story-Marshall-Tama- Including the cities of Estherville, Algona, Forest City, Lake Mills, Northwood, Manly, Emmetsburg, Garner, Britt, Kanawha, Mason City, Clear Lake, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Humboldt, Eagle Grove, Clarion, Belmond, Hampton, Parkersburg, Clarksville, Shell Rock, Greene, Aplington, Allison, Dumont, Waverly, Sac City, Lake View, Odebolt, Wall Lake, Schaller, Early, Rockwell City, Manson, Lake City, Pomeroy, Fort Dodge, Webster City, Iowa Falls, Eldora, Ackley, Grundy Center, Reinbeck, Conrad, Dike, Wellsburg, Waterloo, Cedar Falls, Carroll, Jefferson, Boone, Ames, Marshalltown, Tama, Toledo, Traer, Dysart, and Gladbrook 959 AM CST Fri Jan 12 2018 ...WIND CHILL ADVISORY WILL EXPIRE AT 10 AM CST THIS MORNING... Wind chill values are improving across the area this morning, however, expect wind chills of 20 to 25 below zero to linger through 11 am this morning. In addition, bitterly cold wind chills can be expected each night and morning through Tuesday with additional headlines likely. $$ For more information from the National Weather Service visit http://weather.gov/desmoines
What forecasters said that day
The local office's own words before this wind chill advisory went out, 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 this wind chill advisory went out at Jan 11, 11:55 AM CST, 2 hours 29 minutes earlier.
Area forecast discussion, Jan 11, 11:55 AM CST, 2 hours 29 minutes before
Area Forecast Discussion National Weather Service Des Moines IA 1155 AM CST Thu Jan 11 2018 ...Updated for Near Term Trends and 18z Aviation Discussion... .UPDATE... Issued at 1154 AM CST Thu Jan 11 2018 Main PV anomaly and associated dry slot is centered over central Iowa along and east of the I-35 corridor and will continue to move to the northeast per GOES-16 imagery. Radar shows the deformation snow band from roughly Estherville to around Carroll. This location is a bit farther west and therefore have shifted the highest axis of QPF a bit in that direction as well for the afternoon. Another area of precipitation (mainly snow) continues over the southeastern forecast area that may also have enhanced precipitation rates. At this time, no plan to change headlines. Snow will end this afternoon, though gusty winds will persist causing areas of blowing snow, especially in rural areas. && .SHORT TERM.../Today through Tonight/ Issued at 313 AM CST Thu Jan 11 2018 Confidence: Medium to High Complicated system with some adjustments to headline outline. Models have arrived with a slight southeast shift of the main axis of heavier precipitation. For that reason have removed some of the far north/northwest counties from the warning due to snowfall amounts possibly about 1 to 2 inches lower overall. Farther south there remains good agreement between the models for a heavier axis of snow to set up between 12-18z across the remaining warning area. Per previous forecasts this will be a combination of lift along the boundary along with increasing deformation/weak trowal extending back into southwest to northeast Iowa during the 12-18z timeframe. Though the layer isn't quite perfectly matched in the dendritic layer...potential banding along the frontal boundary and just north of it will help to increase snowfall rates during the morning into early afternoon hours. As expected the cold air is already getting ingested into the system with the potential for a brief light glaze of ice extending across the eastern counties this morning...and lingering light snow with minor accumulations later in the afternoon have expanded...along with our neighbors to the east/south...the winter weather advisory through the afternoon hours. Winds will still be strong on the back side of the front through the morning and afternoon hours...up to 20 to 30 mph with higher gusts at times. Regarding the headlines...the winter storm warning has been extended slightly southeast of the present area...to northwest portions of Dallas County/Adair Counties where increased snowfall and higher winds should occur this morning and through the early afternoon. The snowfall amounts for the system still look to be in the 3 to 5 inch range across the warning areas with some potential for a few higher totals. The main concerns in the warning area remain the impacts from the snow and wind resulting in very poor travel conditions for the morning into the early afternoon. By mid to late afternoon we will again see much colder air streaming southeast along with the snow ending east/northeast...additional light accumulations northeast during the afternoon hours. By tonight any blowing snow will be on the decrease with clearing skies...along with bitter cold temperatures. Lows tonight will drop into the 0 to 5 above range across the southeast and from 0 to nearly 10 below across the far northwest areas of the state. .LONG TERM.../Friday through Wednesday/ Issued at 313 AM CST Thu Jan 11 2018 Minor changes made to the extended, with the largest change being the removal of pops from the 06-12Z Saturday time frame. That shortwave doesn't look as strong anymore and looks to diver further to the southwest which only grazes our forecast area in the evening. Otherwise the main story of very cold air returning remains on track. Highs on Friday will only be in the single digits north to the teens south which will be the story through Saturday as the Upper Midwest remains entrenched in a deep trough over ht e region with a surface high centered to the north and west of Iowa. Sunday looks to be the most interesting day of the extended. A weak shortwave drops south of the state but will bring clouds and some light snow to the area...mainly across southern Iowa then by late morning a strong trough drops into the state with an associated shortwave ahead of the main trough. At this time models have less than a tenth of an inch qpf with this system but given the forcing with this and the potential for high snow ratios as cold air pours in with the trough...we could see more than the inch or so of snow currently forecast. Following this will be another blast of arctic air. We recover from the first blast of cold somewhat on Sunday with weak theta-e advection moving across the state. Highs will be in the teens and lower 20s but then for Monday and Tuesday, highs will be in the single digits to around 10. The trough then moves off into the Great Lakes for Wednesday with ridging developing over the region and moderating temps. Highs currently forecast for Wednesday are in the upper 20s to mid 30s but this may be optimistic depending on how much and widespread the snow is on Sunday. At the tail end of the long term period models are in high disagreement but they all indicate, at varying degrees, another system impacting the state late Wednesday night and Thursday. Due to low confidence and model discrepancy, left the token PoPs the model blends put in the Thursday period. && .AVIATION.../For the 18Z TAFS through 18Z Friday afternoon/ Issued at 1154 AM CST Thu Jan 11 2018 Primary concerns are ceiling and visibility restrictions and gusty winds causing blowing snow through this evening. All terminals have switched over to snow, although brief periods of freezing drizzle are still possible mainly at KDSM and KOTM. Conditions will improve from widespread LIFR/IFR at midday to VFR late this afternoon or early this evening as the snow ends from southwest to northeast. Winds will decrease overnight with VFR conditions prevailing through the end of the period. && .DMX WATCHES/WARNINGS/ADVISORIES... Winter Weather Advisory until 6 PM CST this evening for IAZ004>006-015-023-027-028-033-038-039-044-048>050-060>062- 072>075-081>086-092>097. Winter Storm Warning until 6 PM CST this evening for IAZ007-016- 017-024>026-034>037-045>047-057>059-070-071. && UPDATE...Ansorge SHORT TERM...REV LONG TERM...FAB AVIATION...Ansorge
Hazardous weather outlook, Jan 11, 6:44 AM CST, 7 hours 40 minutes before
Hazardous Weather Outlook National Weather Service Des Moines IA 644 AM CST Thu Jan 11 2018 IAZ007-016-017-024>026-034>037-045>047-057>059-070-071-121245- Worth-Hancock-Cerro Gordo-Humboldt-Wright-Franklin-Calhoun- Webster-Hamilton-Hardin-Carroll-Greene-Boone-Audubon-Guthrie- Dallas-Cass-Adair- 644 AM CST Thu Jan 11 2018 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...Today and tonight A Winter Storm Warning is in effect for the area today. Please refer to the National Weather Service website at weather.gov/desmoines for further details. Cold air tonight will drop wind chill values down to minus 15 to minus 25...especially across northern Iowa. .DAYS TWO THROUGH SEVEN...Friday through Wednesday A system will arrive late Sunday and Sunday night and will bring light snow and gusty northwest winds to the area. Bitter cold temperatures and wind chills are expected to occur over portions of northern Iowa from Saturday night into next Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed, but snow amounts and visibility reports will be greatly appreciated. Please submit snow amounts and visibility reports. IAZ027-028-038-039-048>050-060>062-072>075-081>086-092>097-121245- Butler-Bremer-Grundy-Black Hawk-Story-Marshall-Tama-Polk-Jasper- Poweshiek-Madison-Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas- Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis- 644 AM CST Thu Jan 11 2018 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...Today and tonight A Winter Weather Advisory is in effect for the area today. Please refer to the National Weather Service website at weather.gov/desmoines for further details. Cold air tonight will drop wind chill values down to minus 10 to minus 20. .DAYS TWO THROUGH SEVEN...Friday through Wednesday A system will arrive late Sunday and Sunday night and will bring light snow and gusty northwest winds to the area. Bitter cold temperatures and wind chills are expected to occur over portions of northern Iowa from Saturday night into next Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed, however winter weather reports with the upcoming winter system would be appreciated. IAZ004>006-015-023-033-044-121245- Emmet-Kossuth-Winnebago-Palo Alto-Pocahontas-Sac-Crawford- 644 AM CST Thu Jan 11 2018 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...Today and tonight A Winter Weather Advisory is in effect for the area today. Please refer to the National Weather Service website at weather.gov/desmoines for further details. Cold air tonight will drop wind chill values down to minus 20 to minus 30...especially across northern Iowa. .DAYS TWO THROUGH SEVEN...Friday through Wednesday A system will arrive late Sunday and Sunday night and will bring light snow and gusty northwest winds to the area. Bitter cold temperatures and wind chills are expected to occur over portions of northern Iowa from Saturday night into next Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed, but snow amounts and visibility reports will be greatly appreciated. Please submit snow amounts and visibility reports. REV/FAB/Kotenberg
In the hours before
Local storm report, Jan 11, 11:46 AM CST, 2 hours 38 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1146 AM CST THU JAN 11 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1145 AM SNOW 1 ENE WEBSTER CITY 42.47N 93.80W
01/11/2018 E2.0 INCH HAMILTON IA BROADCAST MEDIA
KQWC RADIO.
&&
AKLocal storm report, Jan 11, 12:04 PM CST, 2 hours 20 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1204 PM CST THU JAN 11 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1140 AM SNOW 2 E WELLSBURG 42.44N 92.89W
01/11/2018 E1.0 INCH GRUNDY IA BROADCAST MEDIA
RELAYED VIA SOCIAL MEDIA.
&&Local storm report, Jan 11, 12:30 PM CST, 1 hour 54 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1230 PM CST THU JAN 11 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1200 PM SNOW 3 S POLK CITY 41.74N 93.72W
01/11/2018 M1.0 INCH POLK IA OFFICIAL NWS OBS
&&
AKLocal storm report, Jan 11, 12:31 PM CST, 1 hour 53 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1231 PM CST THU JAN 11 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1230 PM SNOW DES MOINES INT AIRPORT 41.53N 93.66W
01/11/2018 M0.6 INCH POLK IA OFFICIAL NWS OBS
&&
AKLocal storm report, Jan 11, 12:36 PM CST, 1 hour 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1236 PM CST THU JAN 11 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1236 PM SNOW 1 W NEW VIRGINIA 41.18N 93.75W
01/11/2018 E1.5 INCH WARREN IA TRAINED SPOTTER
&&Local storm report, Jan 11, 1:40 PM CST, 44 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
140 PM CST THU JAN 11 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0140 PM SNOW 2 ENE FORT DODGE 42.52N 94.15W
01/11/2018 E2.0 INCH WEBSTER IA TRAINED SPOTTER
&&
AKNearby
Wind Chill Advisories in Iowa, 2018Every wind chill 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.