Alert archive / Iowa / Wind Chill Advisories in 2018

Wind Chill Advisory 3, NWS Des Moines, IA

January 11, 201826 counties in Iowa

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.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2018-01-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2018-01-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 97 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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.

&&

AK
Local 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

&&

AK
Local 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

&&

AK
Local 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

&&

AK

Nearby

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.