Alert archive / Iowa / Winter Storm Watches in 2021

Winter Storm Watch 2, NWS Des Moines, IA

January 23, 202122 counties in Iowa

NWS Des Moines, IA issued this winter storm watch at Jan 23, 2021, 3:27 PM CST for 22 counties in Iowa. It took effect at Jan 25, 2021, 6:00 AM CST. It was in force for .

The area

The counties it named.

The facts

Issued
Jan 23, 2021, 3:27 PM CST (21:27 UTC)
In effect from
Jan 25, 2021, 6:00 AM CST
Expired
Jan 24, 2021, 3:17 AM CST
In force
Issued by
NWS Des Moines, IA
All 22 counties

Adair County, IA, Adams County, IA, Appanoose County, IA, Cass County, IA, Clarke County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Monroe County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 66 km from the middle of the area, began a volume at 21:32 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 12:00Z, 9.5 hours before the alert went out and 235 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, Omaha, NE at 12:00Z on 2021-01-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2021-01-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1047 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
278 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

913 
WWUS43 KDMX 232127
WSWDMX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Des Moines IA
327 PM CST Sat Jan 23 2021

...Winter Storms Tonight and again Monday and Monday Night..

.Three winter systems will impact Iowa into midweek with the first
two, and especially second, being the most significant. The first
will produce light to moderate snow across central and northern 
Iowa tonight, mainly this evening, with areas of freezing drizzle 
south overnight. This will be followed by a larger, more 
significant winter storm Monday and Monday Night with widespread 
moderate to heavy snows across central and southern Iowa. Another 
weaker system is also anticipated late Tuesday into Wednesday 
morning.

IAZ004>007-015>017-023>028-240500-
/O.CON.KDMX.WW.Y.0004.000000T0000Z-210124T1200Z/
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-
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, and Waverly
327 PM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM CST
SUNDAY...

* WHAT...Snow expected. Total snow accumulations of 3 to 5 
  inches with a few pockets of higher amounts possible.

* WHERE...Northern Iowa.

* WHEN...Through 6 AM CST Sunday, with peak snowfall rates this 
  evening.

* IMPACTS...Plan on snow covered and slippery road conditions.
  Minor blowing and drifting may occur with southeast winds of 10
  to 15 mph.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road
conditions for the state you are calling from can be obtained by
calling 5 1 1.

&&

$$

IAZ059>062-070>075-081>086-092>097-240500-
/O.NEW.KDMX.WS.A.0002.210125T1200Z-210126T1200Z/
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 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
327 PM CST Sat Jan 23 2021

...WINTER STORM WATCH IN EFFECT FROM MONDAY MORNING THROUGH LATE
MONDAY NIGHT...

* WHAT...Heavy snow possible. Total snow accumulations of 5 to 
  10 inches possible. Winds could gust as high as 35 mph.

* WHERE...Central and southern Iowa.

* WHEN...From Monday morning through late Monday night.

* IMPACTS...Travel could be very difficult. Blowing snow could 
  significantly reduce visibility. The hazardous conditions could 
  especially impact the Monday evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

For more information from the National Weather Service visit
https://weather.gov/desmoines

Small
2 follow-up statements
194 
WWUS43 KDMX 240320
WSWDMX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Des Moines IA
920 PM CST Sat Jan 23 2021

...Winter Storm Tonight and Again Monday and Monday Night..

.Three winter systems will impact Iowa into midweek with the
first two being the most significant. Tonight's will produce 
light to moderate snow across central and northern Iowa through 
late evening with areas of freezing drizzle following the snow in
the south tonight. The second larger and more significant winter 
storm is expected Monday and Monday Night. Widespread moderate to
heavy snow will fall across central and southern Iowa. Another 
weaker system is also anticipated late Tuesday into Wednesday 
morning which could add several more inches of snowfall. 

IAZ004>007-015>017-023>028-241130-
/O.CON.KDMX.WW.Y.0004.000000T0000Z-210124T1200Z/
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-
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, and Waverly
920 PM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM CST
SUNDAY...

* WHAT...Snow expected. Total snow accumulations of 2 to 4 inches
  with a few pockets of higher amounts possible.

* WHERE...Northern Iowa.

* WHEN...Through 6 AM CST Sunday, with peak snowfall rates through
  midnight.

* IMPACTS...Plan on snow covered and slippery road conditions. 
  Minor blowing and drifting may occur with southeast winds of 
  10 to 15 mph.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

IAZ059>062-070>075-081>086-092>097-241130-
/O.CON.KDMX.WS.A.0002.210125T1200Z-210126T1200Z/
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 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
920 PM CST Sat Jan 23 2021

...WINTER STORM WATCH REMAINS IN EFFECT FROM MONDAY MORNING
THROUGH LATE MONDAY NIGHT...

* WHAT...Heavy snow possible. Total snow accumulations of 5 to 
  10 inches possible. Winds could gust as high as 35 mph.

* WHERE...Central and southern Iowa.

* WHEN...From Monday morning through late Monday night.

* IMPACTS...Travel could be very difficult. Blowing snow could
  significantly reduce visibility and result in very hazardous
  travel. These hazardous conditions are expected to impact the
  Monday afternoon through evening commutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

For more information from the National Weather Service visit
https://weather.gov/desmoines
423 
WWUS43 KDMX 240917
WSWDMX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Des Moines IA
317 AM CST Sun Jan 24 2021

...Winter Storm Monday and Monday Night..

.A significant winter storm is expected to impact much of central
and southern Iowa Monday and Monday night. Snow possibly becoming
a wintry mix at times, will begin across far southern Iowa late
tonight then will expand north into central Iowa during the day
Monday. Heavy snowfall rates are likely with this storm, in
particular, during Monday afternoon and will result in widespread
moderate to heavy snow. Increasing northeast wind may gust over 30
mph at times and will cause moderate blowing and drifting. Some
uncertainty remains on the north edge of the snow band, where a
sharp gradient in snow totals is likely. The most uncertain areas
have been placed into a Winter Storm Watch.

IAZ004>007-015>017-023>028-241030-
/O.CAN.KDMX.WW.Y.0004.000000T0000Z-210124T1200Z/
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-
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, and Waverly
317 AM CST Sun Jan 24 2021

...WINTER WEATHER ADVISORY IS CANCELLED...

Snow is ending and the advisory has been cancelled.

$$

IAZ059>062-070>075-081>086-092>097-241730-
/O.UPG.KDMX.WS.A.0002.210125T1200Z-210126T1200Z/
/O.NEW.KDMX.WS.W.0002.210125T1200Z-210126T1200Z/
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 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
317 AM CST Sun Jan 24 2021

...WINTER STORM WARNING IN EFFECT FROM 6 AM MONDAY TO 6 AM CST
TUESDAY...

* WHAT...Heavy snow and blowing snow expected. Total snow
  accumulations of 8 to 12 inches with locally higher. Highest
  amounts will be over southern Iowa.

* WHERE...Parts of central and southern Iowa along and south of
  Interstate 80.

* WHEN...From 6 AM Monday to 6 AM CST Tuesday.

* IMPACTS...Travel could be very difficult to impossible. Blowing
  snow could significantly reduce visibility and cause moderate
  drifting. The hazardous conditions will significantly impact the
  Monday evening commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

$$

IAZ037>039-044>050-057-058-241730-
/O.NEW.KDMX.WS.A.0003.210125T1200Z-210126T1200Z/
Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-Boone-Story-
Marshall-Tama-Audubon-Guthrie-
Including the cities of Iowa Falls, Eldora, Ackley, 
Grundy Center, Reinbeck, Conrad, Dike, Wellsburg, Waterloo, 
Cedar Falls, Denison, Carroll, Jefferson, Boone, Ames, 
Marshalltown, Tama, Toledo, Traer, Dysart, Gladbrook, Audubon, 
Exira, Guthrie Center, Panora, Bayard, and Casey
317 AM CST Sun Jan 24 2021

...WINTER STORM WATCH IN EFFECT FROM MONDAY MORNING THROUGH LATE
MONDAY NIGHT...

* WHAT...Moderate to heavy snow possible. Total snow accumulations
  of 2 to 8 inches possible with the highest amounts on the south
  end of the watch. Subtle changes in the forecast storm track may
  have big changes in the snow totals. There will likely be a
  sharp snow total gradient across this area, thus the wide range.

* WHERE...Portions of central Iowa generally along the Highway 20
  and Highway 30 corridors.

* WHEN...From Monday morning through late Monday night.

* IMPACTS...Travel could be very difficult. Blowing snow could
  significantly reduce visibility and cause moderate drifting. 
  The hazardous conditions could significantly impact the Monday 
  evening commute.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation. 

&&

$$

For more information from the National Weather Service visit
https://weather.gov/desmoines

Nearby

Winter Storm Watches in Iowa, 2021Every winter storm watch in 2021

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.