Alert archive / South Dakota / Winter Weather Advisories in 2021

Winter Weather Advisory 4, NWS Sioux Falls, SD

January 22, 20214 states

NWS Sioux Falls, SD issued this winter weather advisory at Jan 22, 2021, 4:05 AM CST for 4 states. It took effect at Jan 23, 2021, 3:00 AM CST. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued
Jan 22, 2021, 4:05 AM CST (10:05 UTC)
In effect from
Jan 23, 2021, 3:00 AM CST
Expired
Jan 24, 2021, 12:00 AM CST
In force
21 hr
Issued by
NWS Sioux Falls, SD
All 45 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Dakota County, NE, Dixon County, NE, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 16 km from the middle of the area, began a volume at 10:03 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

Aberdeen, SD (KABR), launched 00:00Z, 10.1 hours before the alert went out and 202 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, Aberdeen, SD at 00:00Z on 2021-01-22Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 2021-01-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 square meters per square second.1939587897Sfc1 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
732 m above ground
0-6 km bulk shear
76 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
-29 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

027 
WWUS43 KFSD 221005
WSWFSD

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sioux Falls SD
405 AM CST Fri Jan 22 2021

SDZ038-052-053-057>060-221815-
/O.NEW.KFSD.WW.Y.0004.210123T0900Z-210124T0000Z/
Beadle-Jerauld-Sanborn-Brule-Aurora-Davison-Hanson-
405 AM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 3 AM TO 6 PM CST
SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 2 to 5 
  inches.

* WHERE...Portions of central, east central, south central and 
  southeast South Dakota.

* WHEN...From 3 AM to 6 PM CST Saturday.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may result
  in patchy blowing or drifting snow, but the greatest impacts
  with this system will occur due to the falling snow.

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.

&&

$$

IAZ001-MNZ098-SDZ039-040-054>056-061-062-067-221815-
/O.NEW.KFSD.WW.Y.0004.210123T1200Z-210124T0300Z/
Lyon-Rock-Kingsbury-Brookings-Miner-Lake-Moody-McCook-Minnehaha-
Lincoln-
405 AM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 AM TO 9 PM CST
SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 2 to 5 
  inches.

* WHERE...Portions of east central and southeast South Dakota, 
  northwest Iowa and southwest Minnesota.

* WHEN...From 6 AM to 9 PM CST Saturday.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may result
  in patchy blowing or drifting snow, but the greatest impacts
  with this system will occur due to the falling snow.

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.

&&

$$

IAZ002-003-MNZ071-072-080-081-089-090-097-221815-
/O.NEW.KFSD.WW.Y.0004.210123T1500Z-210124T0600Z/
Osceola-Dickinson-Lincoln-Lyon-Murray-Cottonwood-Nobles-Jackson-
Pipestone-
405 AM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 9 AM SATURDAY TO
MIDNIGHT CST SATURDAY NIGHT...

* WHAT...Snow expected. Total snow accumulations of 3 to 5 
  inches, with isolated higher amounts possible.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...From 9 AM Saturday to midnight CST Saturday night.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may result
  in patchy blowing or drifting snow, but the greatest impacts
  with this system will occur due to the falling snow.

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.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/siouxfalls
9 follow-up statements
902 
WWUS43 KFSD 221629
WSWFSD

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sioux Falls SD
1029 AM CST Fri Jan 22 2021

SDZ038-052-053-057>060-230030-
/O.CON.KFSD.WW.Y.0004.210123T0900Z-210124T0000Z/
Beadle-Jerauld-Sanborn-Brule-Aurora-Davison-Hanson-
1029 AM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 3 AM TO 6 PM
CST SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 2 to 5 
  inches.

* WHERE...Portions of central, east central, south central and 
  southeast South Dakota.

* WHEN...From 3 AM to 6 PM CST Saturday.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may result
  in patchy blowing or drifting snow, but the greatest impacts
  with this system will occur due to the falling snow.


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.

&&

$$

IAZ001-MNZ098-SDZ039-040-054>056-061-062-067-230030-
/O.CON.KFSD.WW.Y.0004.210123T1200Z-210124T0300Z/
Lyon-Rock-Kingsbury-Brookings-Miner-Lake-Moody-McCook-Minnehaha-
Lincoln-
1029 AM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 AM TO 9 PM
CST SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 2 to 5 
  inches.

* WHERE...Portions of east central and southeast South Dakota, 
  northwest Iowa and southwest Minnesota.

* WHEN...From 6 AM to 9 PM CST Saturday.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may result
  in patchy blowing or drifting snow, but the greatest impacts
  with this system will occur due to the falling snow.

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.

&&

$$

IAZ002-003-MNZ071-072-080-081-089-090-097-230030-
/O.CON.KFSD.WW.Y.0004.210123T1500Z-210124T0600Z/
Osceola-Dickinson-Lincoln-Lyon-Murray-Cottonwood-Nobles-Jackson-
Pipestone-
1029 AM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 9 AM SATURDAY
TO MIDNIGHT CST SATURDAY NIGHT...

* WHAT...Snow expected. Total snow accumulations of 3 to 5 
  inches.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...From 9 AM Saturday to midnight CST Saturday night.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may result
  in patchy blowing or drifting snow, but the greatest impacts
  with this system will occur due to the falling snow.

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.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/siouxfalls
354 
WWUS43 KFSD 222045
WSWFSD

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sioux Falls SD
245 PM CST Fri Jan 22 2021

IAZ012-SDZ066-230445-
/O.EXA.KFSD.WW.Y.0004.210123T1200Z-210124T0300Z/
Sioux-Turner-
245 PM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 AM TO 9 PM CST
SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 2 to 4 
  inches.

* WHERE...In South Dakota, Turner County. In Iowa, Sioux County.

* WHEN...From 6 AM to 9 PM CST Saturday.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may result
  in patchy blowing or drifting snow, but the greatest impacts
  with this system will occur due to the falling snow.


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.

&&

$$

IAZ013-014-230445-
/O.EXA.KFSD.WW.Y.0004.210123T1500Z-210124T0600Z/
O'Brien-Clay-
245 PM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 9 AM SATURDAY TO
MIDNIGHT CST SATURDAY NIGHT...

* WHAT...Snow expected. Total snow accumulations of 2 to 4 
  inches.

* WHERE...O'Brien and Clay Counties.

* WHEN...From 9 AM Saturday to midnight CST Saturday night.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may result
  in patchy blowing or drifting snow, but the greatest impacts
  with this system will occur due to the falling snow.


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.

&&

$$

SDZ038-052-053-057>060-230445-
/O.CON.KFSD.WW.Y.0004.210123T0900Z-210124T0000Z/
Beadle-Jerauld-Sanborn-Brule-Aurora-Davison-Hanson-
245 PM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 3 AM TO 6 PM
CST SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 2 to 5 
  inches.

* WHERE...Portions of central, east central, south central and 
  southeast South Dakota.

* WHEN...From 3 AM to 6 PM CST Saturday.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may result
  in patchy blowing or drifting snow, but the greatest impacts
  with this system will occur due to the falling snow.


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.

&&

$$

IAZ001-MNZ098-SDZ039-040-054>056-061-062-067-230445-
/O.CON.KFSD.WW.Y.0004.210123T1200Z-210124T0300Z/
Lyon-Rock-Kingsbury-Brookings-Miner-Lake-Moody-McCook-Minnehaha-
Lincoln-
245 PM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 AM TO 9 PM
CST SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 2 to 5 
  inches.

* WHERE...Portions of east central and southeast South Dakota, 
  northwest Iowa and southwest Minnesota.

* WHEN...From 6 AM to 9 PM CST Saturday.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may result
  in patchy blowing or drifting snow, but the greatest impacts
  with this system will occur due to the falling snow.


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.

&&

$$

IAZ002-003-MNZ071-072-080-081-089-090-097-230445-
/O.CON.KFSD.WW.Y.0004.210123T1500Z-210124T0600Z/
Osceola-Dickinson-Lincoln-Lyon-Murray-Cottonwood-Nobles-Jackson-
Pipestone-
245 PM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 9 AM SATURDAY
TO MIDNIGHT CST SATURDAY NIGHT...

* WHAT...Snow expected. Total snow accumulations of 4 to 6 
  inches.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...From 9 AM Saturday to midnight CST Saturday night.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may result
  in patchy blowing or drifting snow, but the greatest impacts
  with this system will occur due to the falling snow.


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.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/siouxfalls
995 
WWUS43 KFSD 230308
WSWFSD

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sioux Falls SD
908 PM CST Fri Jan 22 2021

SDZ038-052-053-057>060-231115-
/O.CON.KFSD.WW.Y.0004.210123T0900Z-210124T0000Z/
Beadle-Jerauld-Sanborn-Brule-Aurora-Davison-Hanson-
908 PM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 3 AM TO 6 PM
CST SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 2 to 5 
  inches.

* WHERE...Portions of central, east central, south central and 
  southeast South Dakota.

* WHEN...From 3 AM to 6 PM CST Saturday.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may 
  result in patchy blowing or drifting snow, but the greatest 
  impacts with this system will occur due to the falling snow.

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.

&&

$$

IAZ001-012-MNZ098-SDZ039-040-054>056-061-062-066-067-231115-
/O.CON.KFSD.WW.Y.0004.210123T1200Z-210124T0300Z/
Lyon-Sioux-Rock-Kingsbury-Brookings-Miner-Lake-Moody-McCook-
Minnehaha-Turner-Lincoln-
908 PM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 AM TO 9 PM
CST SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 2 to 5 
  inches.

* WHERE...Portions of east central and southeast South Dakota, 
  northwest Iowa and southwest Minnesota.

* WHEN...From 6 AM to 9 PM CST Saturday.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may 
  result in patchy blowing or drifting snow, but the greatest 
  impacts with this system will occur due to the falling snow.

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.

&&

$$

IAZ002-003-013-014-MNZ071-072-080-081-089-090-097-231115-
/O.CON.KFSD.WW.Y.0004.210123T1500Z-210124T0600Z/
Osceola-Dickinson-O'Brien-Clay-Lincoln-Lyon-Murray-Cottonwood-
Nobles-Jackson-Pipestone-
908 PM CST Fri Jan 22 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 9 AM SATURDAY
TO MIDNIGHT CST SATURDAY NIGHT...

* WHAT...Snow expected. Total snow accumulations of 4 to 6 
  inches.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...From 9 AM Saturday to midnight CST Saturday night.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may 
  result in patchy blowing or drifting snow, but the greatest 
  impacts with this system will occur due to the falling snow.

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.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/siouxfalls
737 
WWUS43 KFSD 231010
WSWFSD

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sioux Falls SD
410 AM CST Sat Jan 23 2021

IAZ021-022-231815-
/O.EXA.KFSD.WW.Y.0004.210123T1500Z-210124T0600Z/
Cherokee-Buena Vista-
410 AM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 9 AM THIS MORNING TO
MIDNIGHT CST TONIGHT...

* WHAT...Snow expected. Total snow accumulations of 2 to 4 
  inches, with higher amounts north.

* WHERE...Cherokee and Buena Vista Counties.

* WHEN...From 9 AM this morning to midnight CST tonight.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 20 mph may result
  in patchy blowing or drifting snow, but the greatest impacts 
  with this system will occur due to the falling snow..

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.

&&

$$

SDZ038-052-053-057>060-231815-
/O.CON.KFSD.WW.Y.0004.000000T0000Z-210124T0000Z/
Beadle-Jerauld-Sanborn-Brule-Aurora-Davison-Hanson-
410 AM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM CST THIS
EVENING...

* WHAT...Snow. Additional snow accumulations of 2 to 4 inches.

* WHERE...Portions of central, east central, south central and 
  southeast South Dakota.

* WHEN...Until 6 PM CST this evening.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may result
  in patchy blowing or drifting snow, but the greatest impacts
  with this system will occur due to the falling snow.

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.

&&

$$

IAZ001-012-MNZ098-SDZ039-040-054>056-061-062-066-067-231815-
/O.CON.KFSD.WW.Y.0004.210123T1200Z-210124T0300Z/
Lyon-Sioux-Rock-Kingsbury-Brookings-Miner-Lake-Moody-McCook-
Minnehaha-Turner-Lincoln-
410 AM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM CST THIS
EVENING...

* WHAT...Snow expected. Total snow accumulations of 2 to 5 
  inches.

* WHERE...Portions of east central and southeast South Dakota, 
  northwest Iowa and southwest Minnesota.

* WHEN...Until 9 PM CST this evening.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may 
  result in patchy blowing or drifting snow, but the greatest 
  impacts with this system will occur due to the falling snow.

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.

&&

$$

IAZ002-003-013-014-MNZ071-072-080-081-089-090-097-231815-
/O.CON.KFSD.WW.Y.0004.210123T1500Z-210124T0600Z/
Osceola-Dickinson-O'Brien-Clay-Lincoln-Lyon-Murray-Cottonwood-
Nobles-Jackson-Pipestone-
410 AM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 9 AM THIS
MORNING TO MIDNIGHT CST TONIGHT...

* WHAT...Snow expected. Total snow accumulations of 3 to 6 
  inches, with locally higher amounts possible.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...From 9 AM this morning to midnight CST tonight.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Southerly winds of 15 to 25 mph may 
  result in patchy blowing or drifting snow, but the greatest 
  impacts with this system will occur due to the falling snow.

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.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/siouxfalls
952 
WWUS43 KFSD 231733
WSWFSD

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sioux Falls SD
1133 AM CST Sat Jan 23 2021

SDZ038-052-053-057>060-240000-
/O.CON.KFSD.WW.Y.0004.000000T0000Z-210124T0000Z/
Beadle-Jerauld-Sanborn-Brule-Aurora-Davison-Hanson-
1133 AM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM CST THIS
EVENING...

* WHAT...Snow. Additional snow accumulations of around 2 inches.

* WHERE...Portions of central, east central, south central and 
  southeast South Dakota.

* WHEN...Until 6 PM CST this evening.

* IMPACTS...Plan on slippery road conditions.

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.

&&

$$

IAZ001-012-MNZ098-SDZ039-040-054>056-061-062-066-067-240300-
/O.CON.KFSD.WW.Y.0004.000000T0000Z-210124T0300Z/
Lyon-Sioux-Rock-Kingsbury-Brookings-Miner-Lake-Moody-McCook-
Minnehaha-Turner-Lincoln-
1133 AM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM CST THIS
EVENING...

* WHAT...Snow. Additional snow accumulations of 2 to 3 inches.

* WHERE...Portions of east central and southeast South Dakota, 
  northwest Iowa and southwest Minnesota.

* WHEN...Until 9 PM CST this evening.

* IMPACTS...Plan on slippery road conditions.

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.

&&

$$

IAZ002-003-013-014-021-022-MNZ071-072-080-081-089-090-097-240600-
/O.CON.KFSD.WW.Y.0004.000000T0000Z-210124T0600Z/
Osceola-Dickinson-O'Brien-Clay-Cherokee-Buena Vista-Lincoln-Lyon-
Murray-Cottonwood-Nobles-Jackson-Pipestone-
1133 AM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT CST
TONIGHT...

* WHAT...Snow. Additional snow accumulations of 2 to 4 inches.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...Until midnight CST tonight.

* IMPACTS...Plan on slippery road conditions.

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.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/siouxfalls
196 
WWUS43 KFSD 232345
WSWFSD

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sioux Falls SD
545 PM CST Sat Jan 23 2021

SDZ038-052-053-057>060-240300-
/O.EXT.KFSD.WW.Y.0004.000000T0000Z-210124T0300Z/
Beadle-Jerauld-Sanborn-Brule-Aurora-Davison-Hanson-
545 PM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 9 PM CST THIS
EVENING...

* WHAT...Snow. Additional snow accumulations of up to one inch.

* WHERE...Portions of central, east central, south central and 
  southeast South Dakota.

* WHEN...Until 9 PM CST this evening.

* IMPACTS...Plan on slippery road conditions.

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.

&&

$$

IAZ001-012-MNZ098-SDZ039-040-054>056-061-062-066-067-240300-
/O.CON.KFSD.WW.Y.0004.000000T0000Z-210124T0300Z/
Lyon-Sioux-Rock-Kingsbury-Brookings-Miner-Lake-Moody-McCook-
Minnehaha-Turner-Lincoln-
545 PM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM CST THIS
EVENING...

* WHAT...Snow. Additional snow accumulations of up to one to two 
  inches.

* WHERE...Portions of east central and southeast South Dakota, 
  northwest Iowa and southwest Minnesota.

* WHEN...Until 9 PM CST this evening.

* IMPACTS...Plan on slippery road conditions.

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.

&&

$$

IAZ002-003-013-014-021-022-MNZ071-072-080-081-089-090-097-240600-
/O.CON.KFSD.WW.Y.0004.000000T0000Z-210124T0600Z/
Osceola-Dickinson-O'Brien-Clay-Cherokee-Buena Vista-Lincoln-Lyon-
Murray-Cottonwood-Nobles-Jackson-Pipestone-
545 PM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT CST
TONIGHT...

* WHAT...Snow. Additional snow accumulations of 1 to 4 inches.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...Until midnight CST tonight.

* IMPACTS...Plan on slippery road conditions.

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.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/siouxfalls
085 
WWUS43 KFSD 240056
WSWFSD

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sioux Falls SD
656 PM CST Sat Jan 23 2021

IAZ020-031-032-NEZ013-014-SDZ050-063>065-068>071-240600-
/O.EXA.KFSD.WW.Y.0004.000000T0000Z-210124T0600Z/
Plymouth-Woodbury-Ida-Dixon-Dakota-Gregory-Charles Mix-Douglas-
Hutchinson-Bon Homme-Yankton-Clay-Union-
656 PM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY IN EFFECT UNTIL MIDNIGHT CST TONIGHT...

* WHAT...Mixed precipitation. Additional snow accumulations of up
  to one inch. Ice accumulation of a light glaze. 

* WHERE...Portions of south central and southeast South Dakota, 
  northeast Nebraska and northwest and west central Iowa.

* WHEN...Until midnight CST tonight.

* IMPACTS...Plan on slippery road conditions.

* ADDITIONAL DETAILS...Areas of freezing drizzle are resulting in
  ice covered roads across the area. 

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.

&&

$$

IAZ001-012-MNZ098-SDZ039-040-054>056-061-062-066-067-240600-
/O.EXT.KFSD.WW.Y.0004.000000T0000Z-210124T0600Z/
Lyon-Sioux-Rock-Kingsbury-Brookings-Miner-Lake-Moody-McCook-
Minnehaha-Turner-Lincoln-
656 PM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL MIDNIGHT CST
TONIGHT...

* WHAT...Snow. Additional snow accumulations of up to one to two 
  inches.

* WHERE...Portions of east central and southeast South Dakota, 
  northwest Iowa and southwest Minnesota.

* WHEN...Until midnight CST tonight.

* IMPACTS...Plan on slippery road conditions.

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.

&&

$$

SDZ038-052-053-057>060-240300-
/O.CON.KFSD.WW.Y.0004.000000T0000Z-210124T0300Z/
Beadle-Jerauld-Sanborn-Brule-Aurora-Davison-Hanson-
656 PM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM CST THIS
EVENING...

* WHAT...Snow. Additional snow accumulations of up to one inch.

* WHERE...Portions of central, east central, south central and 
  southeast South Dakota.

* WHEN...Until 9 PM CST this evening.

* IMPACTS...Plan on slippery road conditions.

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.

&&

$$

IAZ002-003-013-014-021-022-MNZ071-072-080-081-089-090-097-240600-
/O.CON.KFSD.WW.Y.0004.000000T0000Z-210124T0600Z/
Osceola-Dickinson-O'Brien-Clay-Cherokee-Buena Vista-Lincoln-Lyon-
Murray-Cottonwood-Nobles-Jackson-Pipestone-
656 PM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT CST
TONIGHT...

* WHAT...Snow. Additional snow accumulations of 1 to 3 inches.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...Until midnight CST tonight.

* IMPACTS...Plan on slippery road conditions.

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.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/siouxfalls
108 
WWUS43 KFSD 240254
WSWFSD

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sioux Falls SD
854 PM CST Sat Jan 23 2021

SDZ038-052-053-057>060-240400-
/O.EXP.KFSD.WW.Y.0004.000000T0000Z-210124T0300Z/
Beadle-Jerauld-Sanborn-Brule-Aurora-Davison-Hanson-
854 PM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY WILL EXPIRE AT 9 PM CST THIS EVENING...

While the potential for slick roads will continue into the
overnight hours, any remaining falling snow should come to an end
in the next hour or so. Continue to use caution if traveling
overnight. 

$$

IAZ001-012-MNZ098-SDZ039-040-054>056-061-062-066-067-240600-
/O.CON.KFSD.WW.Y.0004.000000T0000Z-210124T0600Z/
Lyon-Sioux-Rock-Kingsbury-Brookings-Miner-Lake-Moody-McCook-
Minnehaha-Turner-Lincoln-
854 PM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT CST
TONIGHT...

* WHAT...Snow. Additional snow accumulations of up to one inch.

* WHERE...Portions of east central and southeast South Dakota, 
  northwest Iowa and southwest Minnesota.

* WHEN...Until midnight CST tonight.

* IMPACTS...Plan on slippery road conditions.

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.

&&

$$

IAZ002-003-013-014-021-022-MNZ071-072-080-081-089-090-097-240600-
/O.CON.KFSD.WW.Y.0004.000000T0000Z-210124T0600Z/
Osceola-Dickinson-O'Brien-Clay-Cherokee-Buena Vista-Lincoln-Lyon-
Murray-Cottonwood-Nobles-Jackson-Pipestone-
854 PM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT CST
TONIGHT...

* WHAT...Snow. Additional snow accumulations of up to two inches.

* WHERE...Portions of northwest Iowa and southwest Minnesota.

* WHEN...Until midnight CST tonight.

* IMPACTS...Plan on slippery road conditions.

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.

&&

$$

IAZ020-031-032-NEZ013-014-SDZ050-063>065-068>071-240600-
/O.CON.KFSD.WW.Y.0004.000000T0000Z-210124T0600Z/
Plymouth-Woodbury-Ida-Dixon-Dakota-Gregory-Charles Mix-Douglas-
Hutchinson-Bon Homme-Yankton-Clay-Union-
854 PM CST Sat Jan 23 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT CST
TONIGHT...

* WHAT...Mixed precipitation. Additional snow accumulations of
  less than one inch. Ice accumulation of a light glaze. 

* WHERE...Portions of south central and southeast South Dakota, 
  northeast Nebraska and northwest and west central Iowa.

* WHEN...Until midnight CST tonight.

* IMPACTS...Plan on slippery road conditions.

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.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/siouxfalls
338 
WWUS43 KFSD 240602
WSWFSD

URGENT - WINTER WEATHER MESSAGE
National Weather Service Sioux Falls SD
1202 AM CST Sun Jan 24 2021

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ039-040-050-054>056-061>071-240715-
/O.EXP.KFSD.WW.Y.0004.000000T0000Z-210124T0600Z/
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Dixon-Dakota-Kingsbury-Brookings-Gregory-Miner-
Lake-Moody-McCook-Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-
Bon Homme-Yankton-Union-
1202 AM CST Sun Jan 24 2021

...WINTER WEATHER ADVISORY HAS EXPIRED...

Light snow is winding down over southwest Minnesota and northwest
Iowa, with little additional accumulation expected. However, roads
may remain slick overnight due to earlier snow or light freezing
drizzle, so please continue to use caution while traveling.

$$

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

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 Jan 22, 4:00 AM CST, 5 minutes earlier.

Area forecast discussion, Jan 22, 4:00 AM CST, 5 minutes before
AREA FORECAST DISCUSSION
National Weather Service Sioux Falls SD
400 AM CST Fri Jan 22 2021

.SHORT TERM...(Today and Tonight)
Issued at 400 AM CST Fri Jan 22 2021

Stratus has persisted through the overnight in areas along and west
of the James River Valley, but as of yet, models still hard-pressed
to capture the current extent of the lower clouds. Will stick with
persistence through the morning, with total cloud cover gradually
increasing farther east as mid-high clouds continue to slide over
the region. The increase in clouds and generally cool air mass will
keep temperatures near to below normal today, with highs from the
upper teens-lower 20s east of I-29, to near freezing west of the
James River Valley.

Far southwest portions of the region will be watch blossoming area
of light snow from southwest SD into western Nebraska, as this may
still scrape Gregory County with some flurries/light snow through
early afternoon, but little if any accumulation expected into our
forecast area at this time.

By late tonight, will be watching the start of our upcoming snow
event, with snow spreading into western parts of the area in
response to increasing warm advection ahead of approaching wave.
Minor differences in how far east the snow will develop prior to
12Z, but consensus keeps bulk of the snowfall along/west of the
James River Valley, with perhaps some flurries approaching the
Interstate 29 corridor.

.LONG TERM...(Saturday through Thursday)
Issued at 400 AM CST Fri Jan 22 2021

Lift ahead of the wave increases rapidly after 12Z, which should
lead to quick expansion of light snow eastward along the advancing
warm front, primarily focused along/north of Interstate 90 through
the morning. Models do depict a band of mid-level frontogenesis
which could briefly enhance snowfall rates, but this feature looks
to be progressive enough to prevent excessive snowfall in any one
location, instead allowing for an hour or two where rates could
exceed 0.5"/hr. South of this east-west oriented snow band, multiple
high-res models are showing a window of drier low level air working
northward, possibly as far as north as the I-90 corridor by midday,
before mid-level wave triggers additional development southward
again across southeast SD, into eastern NE/northwest IA by mid to
late afternoon. This activity will continue to work eastward into
the evening, ending most areas by 06Z or shortly after as the wave
passes east of the forecast area. Winds still look to remain in
check, possibly gusting as high as 25 mph at times on Saturday.
While patchy blowing/drifting snow is possible, this should not
enhance any impacts already seen from the falling snow.

Snowfall amounts remain on track with previous forecasts, generally
ranging from an inch or so along the Missouri River Valley, to a
broad 3-5 inches along and north of I-90. Highest amounts still
focused toward southern Minnesota, where isolated 6+ amounts are
still indicated in some models. However, greater potential for these
higher amounts lies closer to the Minnesota River Valley, with the
latest probabilistic snowfall information showing very low chances
for greater than 6 inches across our forecast area. With growing
confidence that snowfall will largely remain within the 3-6 inch
range, have issued a Winter Weather Advisory for areas along/north
of I-90, dipping just into the northern tier of our northwest Iowa
counties. Further adjustment to the advisory area is possible, most
likely related to impact of midday drying across our southeast areas.

Latter half of the weekend should be less eventful with weak surface
ridge moving across the region. Winds will be on the lighter side, a
good thing as temperatures hold below normal.

Early week precip chances remain uncertain, as multiple southern
stream waves slide through the central Plains. Deterministic models
similar in keeping precipitation chances largely south of our
forecast area later Sunday night/Monday, but GEFS/ECMWF ensembles
indicate potential for some light accumulation working into areas
south of I-90. Next wave slated to move through sometime in the late
Tuesday-early Wednesday time frame, and while this currently looks
to be the better chance for additional light snow spreading into our
forecast area, uncertainty in timing details precludes making any
adjustments to the low blended pops at this time.

While confidence in snowfall chances is on the low side, confidence
in the colder air settling into the region early next week remains
higher, with Monday and Tuesday looking to be the coldest days of
the week. Highs will likely hold in the teens-lower 20s, with lows
Monday dropping to the single digits or possibly a few degrees below
zero. Winds remain relatively light given the weak surface pattern,
but with the colder air in place, most locations have the potential
for sub-zero wind chills by Tuesday morning.

Latter half of the week trends back toward more mild pattern, with
drier conditions looking to prevail as well.

&&

.AVIATION...(For the 06Z TAFS through 06Z Friday night)
Issued at 1042 PM CST Thu Jan 21 2021

Guidance is poorly handling an area of MVFR stratus sliding
through central SD, so confidence is low with regard to how this
may affect KHON and possibly KFSD. Models want to erode these
clouds over the next few hours, though not sure that is going to
happen. At this point, did include an MVFR deck at KHON, but did
not do so at KFSD, though cannot rule it out. Otherwise, winds
are expected to continue to diminish through the night time hours,
becoming light on Friday.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...Winter Weather Advisory from 6 AM to 9 PM CST Saturday for
     SDZ039-040-054>056-061-062-067.

     Winter Weather Advisory from 3 AM to 6 PM CST Saturday for
     SDZ038-052-053-057>060.

MN...Winter Weather Advisory from 6 AM to 9 PM CST Saturday for
     MNZ098.

     Winter Weather Advisory from 9 AM Saturday to midnight CST
     Saturday night for MNZ071-072-080-081-089-090-097.

IA...Winter Weather Advisory from 6 AM to 9 PM CST Saturday for
     IAZ001.

     Winter Weather Advisory from 9 AM Saturday to midnight CST
     Saturday night for IAZ002-003.

NE...NONE.
&&

SHORT TERM...JH
LONG TERM...JH
AVIATION...JM
Hazardous weather outlook, Jan 21, 5:13 PM CST, 10 hours 52 minutes before
Hazardous Weather Outlook
National Weather Service Sioux Falls SD
513 PM CST Thu Jan 21 2021

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ038>040-050-052>071-222315-
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Dixon-Dakota-Beadle-Kingsbury-Brookings-Gregory-
Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-
Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-Yankton-
Union-
513 PM CST Thu Jan 21 2021

This Hazardous Weather Outlook is for 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...Tonight.

Hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Light to moderate snow is likely across the region from late Friday
night into Saturday night. While there is still some uncertainty
regarding snow amounts, at this time 2 to 5 inches is likely with the
greater amounts north of Interstate 90. Locally higher amounts will
be possible in southwestern Minnesota.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Nearby

Winter Weather Advisories in South Dakota, 2021Winter Weather Advisories in Iowa, 2021Winter Weather Advisories in Minnesota, 2021Every winter weather advisory 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.