Alert archive / Iowa / Winter Storm Warnings in 2019

Winter Storm Warning 9, NWS Des Moines, IA

April 26, 20199 counties in Iowa

NWS Des Moines, IA issued this winter storm warning at Apr 26, 2019, 3:24 PM CDT for 9 counties in Iowa. It took effect at Apr 27, 2019, 7:00 AM CDT. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 26, 2019, 3:24 PM CDT (20:24 UTC)
In effect from
Apr 27, 2019, 7:00 AM CDT
Expired
Apr 27, 2019, 3:35 PM CDT
In force
9 hr
Issued by
NWS Des Moines, IA

Counties Black Hawk County, IA, Bremer County, IA, Butler County, IA, Cerro Gordo County, IA, Franklin County, IA, Hancock County, IA, Kossuth County, IA, Winnebago County, IA, Worth County, IA

The radar

The Des Moines radar (KDMX), 145 km from the middle of the area, began a volume at 20:26 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 210 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 2019-04-26Temperature 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, Minneapolis, MN at 12:00Z on 2019-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -28 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
1278 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
-28 m²/s²
0-3 km storm-relative helicity
46 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

256 
WWUS43 KDMX 262024
WSWDMX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Des Moines IA
324 PM CDT Fri Apr 26 2019

...Late Season Winter Storm to Impact Area Saturday...

.A fast moving and windy storm system will bring a narrow band of
wet, heavy snow to portions of northeastern Iowa Saturday. The 
snow may melt on contact at the start of the event, but may start 
to accumulate through the morning hours. North-northeast wind 
gusts of 20 to 30 mph may significantly reduce visibility and make
for hazardous travel.

IAZ007-270430-
/O.UPG.KDMX.WS.A.0006.190427T1200Z-190428T0000Z/
/O.NEW.KDMX.WS.W.0009.190427T1200Z-190428T0000Z/
Worth-
Including the cities of Northwood and Manly
324 PM CDT Fri Apr 26 2019

...WINTER STORM WARNING IN EFFECT FROM 7 AM TO 7 PM CDT
SATURDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 5 to 7
  inches expected. Winds gusting as high as 30 mph.

* WHERE...Northeast Iowa.

* WHEN...From 7 AM to 7 PM CDT Saturday.

* ADDITIONAL DETAILS...Travel could be very difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency. 

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

&&

$$

IAZ004>006-016-017-026>028-270430-
/O.UPG.KDMX.WS.A.0006.190427T1200Z-190428T0000Z/
/O.NEW.KDMX.WW.Y.0028.190427T1200Z-190428T0000Z/
Emmet-Kossuth-Winnebago-Hancock-Cerro Gordo-Franklin-Butler-
Bremer-
Including the cities of Estherville, Algona, Forest City, 
Lake Mills, Garner, Britt, Kanawha, Mason City, Clear Lake, 
Hampton, Parkersburg, Clarksville, Shell Rock, Greene, Aplington,
Allison, Dumont, and Waverly
324 PM CDT Fri Apr 26 2019

...WINTER WEATHER ADVISORY IN EFFECT FROM 7 AM TO 7 PM CDT
SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 1 to 5 inches
  expected. Winds gusting as high as 30 mph.

* WHERE...Northern Iowa.

* WHEN...From 7 AM to 7 PM CDT Saturday.

* ADDITIONAL DETAILS...Plan on slippery road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. 

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

&&

$$

IAZ015-038-039-270430-
/O.NEW.KDMX.WW.Y.0028.190427T1200Z-190428T0000Z/
Palo Alto-Grundy-Black Hawk-
Including the cities of Emmetsburg, Grundy Center, Reinbeck, 
Conrad, Dike, Wellsburg, Waterloo, and Cedar Falls
324 PM CDT Fri Apr 26 2019

...WINTER WEATHER ADVISORY IN EFFECT FROM 7 AM TO 7 PM CDT
SATURDAY...

* WHAT...Snow expected. Total snow accumulations of up to 3 inches
  expected. Winds gusting as high as 30 mph.

* WHERE...Northern Iowa.

* WHEN...From 7 AM to 7 PM CDT Saturday.

* ADDITIONAL DETAILS...Plan on slippery road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. 

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

&&

$$

KRULL

For more information from the National Weather Service visit
https://www.weather.gov/desmoines
7 follow-up statements
116 
WWUS43 KDMX 270340
WSWDMX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Des Moines IA
1040 PM CDT Fri Apr 26 2019

...Late Season Winter Storm to Impact the Area on Saturday...

.A fast moving and windy storm system will bring a narrow band of
wet, heavy snow to portions of far northern Iowa on Saturday. The
snow may melt on contact at the start of the event, but may start
to accumulate through the morning hours as snow rates increase. 
Winds from the northeast will gust generally between 25 and 35 
mph and this may significantly reduce visibility and make for 
hazardous travel. Latest trends have the snow shifting southward 
so adjustment to snow amounts and snow area may occur.

IAZ007-271145-
/O.CON.KDMX.WS.W.0009.190427T1200Z-190428T0000Z/
Worth-
Including the cities of Northwood and Manly
1040 PM CDT Fri Apr 26 2019

...WINTER STORM WARNING REMAINS IN EFFECT FROM 7 AM TO 7 PM CDT
SATURDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 4 to
  around 6 inches expected. Winds gusting as high as 35 mph.

* WHERE...Worth County.

* WHEN...From 7 AM to 7 PM CDT Saturday.

* ADDITIONAL DETAILS...Travel could be difficult at times due to
  reduced visibility and gusty winds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous. 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.

&&

$$

IAZ004>006-015>017-026>028-038-039-271145-
/O.CON.KDMX.WW.Y.0028.190427T1200Z-190428T0000Z/
Emmet-Kossuth-Winnebago-Palo Alto-Hancock-Cerro Gordo-Franklin-
Butler-Bremer-Grundy-Black Hawk-
Including the cities of Estherville, Algona, Forest City, 
Lake Mills, Emmetsburg, Garner, Britt, Kanawha, Mason City, 
Clear Lake, Hampton, Parkersburg, Clarksville, Shell Rock, 
Greene, Aplington, Allison, Dumont, Waverly, Grundy Center, 
Reinbeck, Conrad, Dike, Wellsburg, Waterloo, and Cedar Falls
1040 PM CDT Fri Apr 26 2019

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 7 AM TO 7 PM
CDT SATURDAY...

* WHAT...Snow expected. Total snow accumulations of up to 3 to
  perhaps 4 inches expected. Winds gusting as high as 35 to 40 
  mph.

* WHERE...Northern Iowa.

* WHEN...From 7 AM to 7 PM CDT Saturday.

* ADDITIONAL DETAILS...Roads may become slippery due to falling
  snow. Gusty winds will buffet high profile vehicles at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Roads may become snow covered
and visibility may be limited at times. 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
https://www.weather.gov/desmoines

Ansorge
580 
WWUS43 KDMX 270929
WSWDMX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Des Moines IA
429 AM CDT Sat Apr 27 2019

...Spring Snow Storm to Impact Northern Iowa Today...

.A rapidly moving low pressure system is expected to bring an 
area of rain to transition to snow over northern to northeast 
portions of Iowa today. The snow is expected to be wet, sticky and
heavy at times. Snowfall rates of 1 to 2 inches per hour are 
likely and with the strong winds expected during the most intense 
snowfall, resulting in significant visibility restrictions and
dangerous travel conditions today.

IAZ005-006-016-017-026>028-039-271730-
/O.UPG.KDMX.WW.Y.0028.190427T1200Z-190428T0000Z/
/O.EXA.KDMX.WS.W.0009.190427T1200Z-190428T0000Z/
Kossuth-Winnebago-Hancock-Cerro Gordo-Franklin-Butler-Bremer-
Black Hawk-
Including the cities of Algona, Forest City, Lake Mills, Garner, 
Britt, Kanawha, Mason City, Clear Lake, Hampton, Parkersburg, 
Clarksville, Shell Rock, Greene, Aplington, Allison, Dumont, 
Waverly, Waterloo, and Cedar Falls
429 AM CDT Sat Apr 27 2019

...WINTER STORM WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING...

* WHAT...Heavy, wet snow expected. Total snow accumulations of 4
  to 6 inches expected with locally higher amounts near 8 inches
  possible. Winds gusting as high as 35 mph.

* WHERE...North central to northeast Iowa. The higher snow totals
  are expected from around Mason City to Clarksville and eastward
  into Bremer County. 

* WHEN...Until 7 PM CDT this evening.

* ADDITIONAL DETAILS...Roads are expected to be become sloppy and
  slick from the wet snow. Gusty winds will create significant
  visibility restrictions and buffet high profile vehicles at 
  times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency. 

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

&&

$$

IAZ007-271730-
/O.CON.KDMX.WS.W.0009.190427T1200Z-190428T0000Z/
Worth-
Including the cities of Northwood and Manly
429 AM CDT Sat Apr 27 2019

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

* WHAT...Heavy snow expected. Total snow accumulations of 4 to
  around 6 inches expected with locally higher amounts near 8
  inches possible. Winds gusting as high as 35 mph.

* WHERE...Worth County.

* WHEN...From 7 AM to 7 PM CDT Saturday.

* ADDITIONAL DETAILS...Roads are expected to be become sloppy and
  slick from the wet snow. Gusty winds will create significant
  visibility restrictions and buffet high profile vehicles at 
  times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous. 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.

&&

$$

IAZ024-025-037-050-271730-
/O.EXA.KDMX.WW.Y.0028.190427T1200Z-190428T0000Z/
Humboldt-Wright-Hardin-Tama-
Including the cities of Humboldt, Eagle Grove, Clarion, Belmond, 
Iowa Falls, Eldora, Ackley, Tama, Toledo, Traer, Dysart, 
and Gladbrook
429 AM CDT Sat Apr 27 2019

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

* WHAT...Snow expected. Total snow accumulations of 1 to 3 inches
  expected with a few spots near 4 inches along the northern
  portions of counties. Winds gusting as high as 40 mph.

* WHERE...North central Iowa.

* WHEN...From 7 AM to 7 PM CDT Saturday.

* ADDITIONAL DETAILS...Roads may become slippery due to falling
  snow and gusty winds could cause trouble for high profile
  vehicles at times and restricted visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. 

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

&&

$$

IAZ004-015-038-271730-
/O.CON.KDMX.WW.Y.0028.190427T1200Z-190428T0000Z/
Emmet-Palo Alto-Grundy-
Including the cities of Estherville, Emmetsburg, Grundy Center, 
Reinbeck, Conrad, Dike, and Wellsburg
429 AM CDT Sat Apr 27 2019

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

* WHAT...Snow expected. Total snow accumulations of up to 2 to 
  perhaps 4 inches expected. Winds gusting as high as 35 to 40 
  mph.

* WHERE...Northern Iowa.

* WHEN...From 7 AM to 7 PM CDT Saturday.

* ADDITIONAL DETAILS...Roads may become slippery due to falling
  snow and gusty winds could cause trouble for high profile
  vehicles at times and restricted visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Roads may become snow
covered and visibility may be limited at times. Use caution while
driving.

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

&&

$$

Podrazik

For more information from the National Weather Service visit
https://www.weather.gov/desmoines
629 
WWUS43 KDMX 271252
WSWDMX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Des Moines IA
752 AM CDT Sat Apr 27 2019

...Spring Snow Storm to Impact Northern Iowa Today...

.A rapidly moving low pressure system will continue to push across
Iowa today. Rain is quickly switching over to snow across northern
Iowa and thundersnow has been reported at Estherville. The snow 
is expected to be wet, sticky and heavy at times. Snowfall rates 
of 1 to 2 inches per hour are likely at times and with the strong
winds expected during the most intense snowfall, significant 
visibility restrictions and dangerous travel conditions will ensue
today. Plus, with the sticky nature of the snow and gusty winds,
damage to trees and powerlines are possible. 

IAZ005>007-016-017-026>028-039-272100-
/O.CON.KDMX.WS.W.0009.000000T0000Z-190428T0000Z/
Kossuth-Winnebago-Worth-Hancock-Cerro Gordo-Franklin-Butler-
Bremer-Black Hawk-
Including the cities of Algona, Forest City, Lake Mills, 
Northwood, Manly, Garner, Britt, Kanawha, Mason City, Clear Lake,
Hampton, Parkersburg, Clarksville, Shell Rock, Greene, Aplington,
Allison, Dumont, Waverly, Waterloo, and Cedar Falls
752 AM CDT Sat Apr 27 2019

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

* WHAT...Heavy, wet sticky snow. Thundersnow possible, enhancing 
  the snowfall rates. Total snow accumulations of 4 to 6 inches 
  expected with locally higher amounts near 8 inches possible. 
  Winds gusting as high as 35 mph.

* WHERE...North central to northeast Iowa. The higher snow 
  totals are expected from around Mason City to Clarksville and 
  eastward into Bremer County.

* WHEN...Until 7 PM CDT this evening.

* ADDITIONAL DETAILS...Roads are expected to be become sloppy 
  and slick from the wet snow. Gusty winds will create 
  significant visibility restrictions and buffet high profile 
  vehicles at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency.

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

&&

$$

IAZ004-015-024-025-037-038-050-272100-
/O.CON.KDMX.WW.Y.0028.000000T0000Z-190428T0000Z/
Emmet-Palo Alto-Humboldt-Wright-Hardin-Grundy-Tama-
Including the cities of Estherville, Emmetsburg, Humboldt, 
Eagle Grove, Clarion, Belmond, Iowa Falls, Eldora, Ackley, 
Grundy Center, Reinbeck, Conrad, Dike, Wellsburg, Tama, Toledo, 
Traer, Dysart, and Gladbrook
752 AM CDT Sat Apr 27 2019

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

* WHAT...Heavy, wet sticky snow expected. Total snow 
  accumulations of 1 to 3 inches expected with a few spots near 4 
  inches along the northern portions of counties. Winds gusting as
  high as 40 mph.

* WHERE...North central Iowa.

* WHEN...From 7 AM to 7 PM CDT Saturday.

* ADDITIONAL DETAILS...Roads may become slippery due to falling 
  snow and gusty winds could cause trouble for high profile 
  vehicles at times and restricted visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving.

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

&&

$$

Podrazik

For more information from the National Weather Service visit
https://www.weather.gov/desmoines
600 
WWUS43 KDMX 271558
WSWDMX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Des Moines IA
1058 AM CDT Sat Apr 27 2019

...Spring Snow Storm to Impact Northern Iowa Today...

.Low pressure moving across the state will produce heavy wet snow
across portions of northern Iowa through this afternoon. Low
visibilities and rapid snowfall rates are expected into the
afternoon before the precipitation ends by early evening. Moderate
to heavy accumulations are expected. 

IAZ005>007-016-017-026>028-039-280000-
/O.CON.KDMX.WS.W.0009.000000T0000Z-190428T0000Z/
Kossuth-Winnebago-Worth-Hancock-Cerro Gordo-Franklin-Butler-
Bremer-Black Hawk-
Including the cities of Algona, Forest City, Lake Mills, 
Northwood, Manly, Garner, Britt, Kanawha, Mason City, Clear Lake,
Hampton, Parkersburg, Clarksville, Shell Rock, Greene, Aplington,
Allison, Dumont, Waverly, Waterloo, and Cedar Falls
1058 AM CDT Sat Apr 27 2019

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

* WHAT...Heavy, wet sticky snow is expected into the afternoon
  with a few claps of thunder. Snowfall rates of 1 to 2 inches per
  hour are likely with total snow accumulations of 4 to 6 inches
  and localized higher amounts. Winds gusting up to 35 mph are
  also expected. 

* WHERE...North central to northeast Iowa. The higher snow 
  totals are expected from around Mason City to Clarksville and 
  eastward into Bremer County.

* WHEN...Until 7 PM CDT this evening.

* ADDITIONAL DETAILS...Roads are expected to be become sloppy 
  and slick from the wet snow. Gusty winds will create 
  significant visibility restrictions and buffet high profile 
  vehicles at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you 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.

&&

$$

IAZ004-015-024-025-037-038-050-280000-
/O.CON.KDMX.WW.Y.0028.000000T0000Z-190428T0000Z/
Emmet-Palo Alto-Humboldt-Wright-Hardin-Grundy-Tama-
Including the cities of Estherville, Emmetsburg, Humboldt, 
Eagle Grove, Clarion, Belmond, Iowa Falls, Eldora, Ackley, 
Grundy Center, Reinbeck, Conrad, Dike, Wellsburg, Tama, Toledo, 
Traer, Dysart, and Gladbrook
1058 AM CDT Sat Apr 27 2019

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

* WHAT...Heavy, wet sticky snow expected. Total snow accumulations
  of 1 to 3 inches expected with a few spots near 4 inches. Winds
  gusting as high as 35 mph at times. 

* WHERE...North central Iowa.

* WHEN...From 7 AM to 7 PM CDT Saturday.

* ADDITIONAL DETAILS...Roads may become slippery due to falling 
  snow and gusty winds could cause trouble for high profile 
  vehicles at times and restricted visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Expect snow covered roads and limited visibilities, and use 
caution while driving. The latest road conditions for the state 
you are calling from can be obtained by calling 5 1 1.

&&

$$

For more information from the National Weather Service visit
https://www.weather.gov/desmoines
522 
WWUS43 KDMX 271819
WSWDMX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Des Moines IA
119 PM CDT Sat Apr 27 2019

...Spring Snow Across Northern Iowa This Afternoon...

.Low pressure moving across the state will produce heavy wet snow
across portions of northern Iowa through this afternoon. Low
visibilities and rapid snowfall rates are expected into the
afternoon before the precipitation ends by early evening.
Moderate to heavy accumulations are expected.

IAZ026-039-280000-
/O.CAN.KDMX.WS.W.0009.000000T0000Z-190428T0000Z/
/O.EXA.KDMX.WW.Y.0028.000000T0000Z-190428T0000Z/
Franklin-Black Hawk-
Including the cities of Hampton, Waterloo, and Cedar Falls
119 PM CDT Sat Apr 27 2019

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 7 PM CDT THIS
EVENING...
...WINTER STORM WARNING IS CANCELLED...

* WHAT...Snow with gusty winds to 35 mph. Snow accumulations of 1
  to 3 inches.

* WHERE...Portions of northern Iowa.

* WHEN...Until 7 PM CDT this evening.

* ADDITIONAL DETAILS...Roads may become slippery due to falling 
  snow and gusty winds could cause trouble for high profile 
  vehicles at times and restricted visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Expect snow covered roads and limited visibilities, and use 
caution while driving. The latest road conditions for the state 
you are calling from can be obtained by calling 5 1 1.

&&

$$

IAZ004-015-024-271930-
/O.CAN.KDMX.WW.Y.0028.000000T0000Z-190428T0000Z/
Emmet-Palo Alto-Humboldt-
Including the cities of Estherville, Emmetsburg, and Humboldt
119 PM CDT Sat Apr 27 2019

...WINTER WEATHER ADVISORY IS CANCELLED...

Only light flurries or sprinkles are expected the remainder of
this afternoon. Impactful snowfall has ended. 

$$

IAZ005>007-016-017-027-028-280000-
/O.CON.KDMX.WS.W.0009.000000T0000Z-190428T0000Z/
Kossuth-Winnebago-Worth-Hancock-Cerro Gordo-Butler-Bremer-
Including the cities of Algona, Forest City, Lake Mills, 
Northwood, Manly, Garner, Britt, Kanawha, Mason City, Clear Lake,
Parkersburg, Clarksville, Shell Rock, Greene, Aplington, Allison,
Dumont, and Waverly
119 PM CDT Sat Apr 27 2019

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

* WHAT...Heavy, wet snow is expected into the afternoon with a few
  claps of thunder. Snowfall rates of 1 inch per hour is likely
  with total snow accumulations of 2 to 5 inches and locally 
  higher amounts. Winds gusting up to 35 mph are also expected.

* WHERE...North central to northeast Iowa. The higher snow 
  totals are expected from around Mason City to Clarksville and 
  eastward into Bremer County.

* WHEN...Until 7 PM CDT this evening.

* ADDITIONAL DETAILS...Roads are expected to be become sloppy 
  and slick from the wet snow. Gusty winds will create 
  significant visibility restrictions and buffet high profile 
  vehicles at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you 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.

&&

$$

IAZ025-037-038-050-280000-
/O.CON.KDMX.WW.Y.0028.000000T0000Z-190428T0000Z/
Wright-Hardin-Grundy-Tama-
Including the cities of Eagle Grove, Clarion, Belmond, 
Iowa Falls, Eldora, Ackley, Grundy Center, Reinbeck, Conrad, 
Dike, Wellsburg, Tama, Toledo, Traer, Dysart, and Gladbrook
119 PM CDT Sat Apr 27 2019

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

* WHAT...Heavy, wet sticky snow expected. Total snow accumulations
  of 1 to 3 inches. Winds gusting as high as 35 mph at times.

* WHERE...North central Iowa.

* WHEN...Until 7 PM CDT this evening.

* ADDITIONAL DETAILS...Roads may become slippery due to falling 
  snow and gusty winds could cause trouble for high profile 
  vehicles at times and restricted visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Expect snow covered roads and limited visibilities, and use
caution while driving. The latest road conditions for the state
you are calling from can be obtained by calling 5 1 1.

&&

$$

For more information from the National Weather Service visit
https://www.weather.gov/desmoines
405 
WWUS43 KDMX 271920
WSWDMX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Des Moines IA
220 PM CDT Sat Apr 27 2019

...Spring Snow Winding Down Across Northern Iowa...

.Snow intensity is diminishing across Iowa this afternoon. This
trend will continue.  

IAZ005>007-016-017-272030-
/O.CAN.KDMX.WS.W.0009.000000T0000Z-190428T0000Z/
Kossuth-Winnebago-Worth-Hancock-Cerro Gordo-
Including the cities of Algona, Forest City, Lake Mills, 
Northwood, Manly, Garner, Britt, Kanawha, Mason City, 
and Clear Lake
220 PM CDT Sat Apr 27 2019

...WINTER STORM WARNING IS CANCELLED...

The threat for impactful snowfall has ended, therefore the warning
is cancelled.

$$

IAZ025-026-037-272030-
/O.CAN.KDMX.WW.Y.0028.000000T0000Z-190428T0000Z/
Wright-Franklin-Hardin-
Including the cities of Eagle Grove, Clarion, Belmond, Hampton, 
Iowa Falls, Eldora, and Ackley
220 PM CDT Sat Apr 27 2019

...WINTER WEATHER ADVISORY IS CANCELLED...

The threat for impactful snowfall has ended, therefore the
advisory is cancelled.

$$

IAZ027-028-280000-
/O.CON.KDMX.WS.W.0009.000000T0000Z-190428T0000Z/
Butler-Bremer-
Including the cities of Parkersburg, Clarksville, Shell Rock, 
Greene, Aplington, Allison, Dumont, and Waverly
220 PM CDT Sat Apr 27 2019

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

* WHAT...Snow with accumulations of 2 to 5 inches. Wind gusts to
  35 mph may also occur. 

* WHERE...Northeast Iowa. 

* WHEN...Until 7 PM CDT this evening.

* ADDITIONAL DETAILS...Roads are expected to be become sloppy 
  and slick from the wet snow. Gusty winds will create 
  significant visibility restrictions and buffet high profile 
  vehicles at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you 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.

&&

$$

IAZ038-039-050-280000-
/O.CON.KDMX.WW.Y.0028.000000T0000Z-190428T0000Z/
Grundy-Black Hawk-Tama-
Including the cities of Grundy Center, Reinbeck, Conrad, Dike, 
Wellsburg, Waterloo, Cedar Falls, Tama, Toledo, Traer, Dysart, 
and Gladbrook
220 PM CDT Sat Apr 27 2019

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

* WHAT...Snow with accumulations of 1 to 3 inches. Wind gusts of
  up to 35 mph. 

* WHERE...Northeast Iowa.

* WHEN...Until 7 PM CDT this evening.

* ADDITIONAL DETAILS...Roads may become slippery due to falling 
  snow and gusty winds could cause trouble for high profile 
  vehicles at times and restricted visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Expect snow covered roads and limited visibilities, and use
caution while driving. The latest road conditions for the state
you are calling from can be obtained by calling 5 1 1.

&&

$$

For more information from the National Weather Service visit
https://www.weather.gov/desmoines
125 
WWUS43 KDMX 272035
WSWDMX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Des Moines IA
335 PM CDT Sat Apr 27 2019

IAZ027-028-272145-
/O.CAN.KDMX.WS.W.0009.000000T0000Z-190428T0000Z/
Butler-Bremer-
Including the cities of Parkersburg, Clarksville, Shell Rock, 
Greene, Aplington, Allison, Dumont, and Waverly
335 PM CDT Sat Apr 27 2019

...WINTER STORM WARNING IS CANCELLED...

Some light snow may persist through 5 PM, however impactful
snowfall has ending. Therefore, the warning has been cancelled. 

$$

IAZ038-039-050-272145-
/O.CAN.KDMX.WW.Y.0028.000000T0000Z-190428T0000Z/
Grundy-Black Hawk-Tama-
Including the cities of Grundy Center, Reinbeck, Conrad, Dike, 
Wellsburg, Waterloo, Cedar Falls, Tama, Toledo, Traer, Dysart, 
and Gladbrook
335 PM CDT Sat Apr 27 2019

...WINTER WEATHER ADVISORY IS CANCELLED...

Some light snow may persist through 5 PM, however impactful
snowfall has ending. Therefore, the advisory has been cancelled. 

$$

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

What forecasters said that day

The local office's own words before this winter storm warning 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 winter storm warning went out at Apr 26, 12:24 PM CDT, 3 hours earlier.

Area forecast discussion, Apr 26, 12:24 PM CDT, 3 hours before
Area Forecast Discussion
National Weather Service Des Moines IA
1224 PM CDT Fri Apr 26 2019

...Updated 18z Aviation...

.SHORT TERM.../Today through Saturday/
Issued at 422 AM CDT Fri Apr 26 2019

The main forecast concern is obviously focused on a potent
clipper system ejecting out of the Northern Rockies and bringing
the potential for impactful winter weather to portions of Iowa
Saturday. Models remain in disagreement with the surface low
track, the ECWMF is tracking the low across southern Iowa
(basically along Highway 34) while the GFS is the furthest north
tracking roughly b/t the Highway 20/Highway 30 corridor. The
26.00z NAM is more along the Interstate 80. The 26.00z HREF has
trended closer the NAM/ECMWF with the southern track. Needless to
say that the southern tracks would favor more snow in the northern
sections of forecast area and utilized a blend of the
HREF/GFS/NAM. The timing of this system looks to be from 09z
Saturday to late Saturday afternoon (~20-23z), so fairly quick
moving and dynamic system.

High confidence in the very strong winds with this system and the
potential for a small heavy band of snow to set up over northern
Iowa. Just a shift in 50-100 miles of the low track will
significantly alter the snowfall forecast and the potential for a
"bust" is medium to high...at least wrt to the higher snowfall
amounts. Yes, the ground has been warm but the snowfall rates should
overcome this and the fact that very strong winds coupled with the
falling snow should lead to potential for significant travels issues.
Confident enough to hoist a Winter Storm Watch across the north for
4+ inches and the strong winds. Potential for an advisory further
south as the snow/rain gradient will be cutting a few counties in
half where northern portions may see snow accumulations and the
southern section all rain.

Sharp gradient of temps from north to south tomorrow and trended
cooler with temperatures throughout the day. A midnight high is
likely or at least prior to 12z Saturday with temperatures slowly
dropping throughout the day across northern Iowa. The NAEFS mean
850mb winds shows a 50-55 knot jet punching into southern Iowa by
12z Saturday and the strong WAA is concerning as it may help nudge
the low to track slightly further north closer to the GFS solution.
No doubt a considerable concern for the low to track a bit further
south and change the heavy snow band location. However, only talking
about a county or two difference where the heavier snow sets up, not
a major shift expected attm.

There is an immense amount of frontogenetical forcing, especially
between 850-700mb setting up over northern Iowa from around 12z
Saturday and continues to through 21z. Plus, very strong forcing
within the dendritic layer during this time and even with the
aforementioned WAA, there doesn't appear to be a warm layer aloft to
deal with and thus the precipitation type is either rain or snow.
Confidence is increasing that the snowfall rates look to overcome
the warm ground temperatures and the surface temperatures for
accumulations to begin from 12-15z Saturday across the far north.
There is even some negative EPV suggested via the NAM/GFS and could
release CSI resulting in upright convection. Thus, cannot rule out
the potential for thundersnow and this scenario would only add to
the snowfall rates Saturday morning.

The potent PV anomaly punches into the state b/t 15-18z Saturday
providing a significant trop fold and intense winds late Saturday
morning into the afternoon.  Increased winds and gusts Saturday and
with the falling snow coinciding with the snowfall across the north,
certainly some nasty travel impacts from the visibility restrictions
and quickly accumulating snow.

.LONG TERM.../Saturday through Thursday/
Issued at 422 AM CDT Fri Apr 26 2019

/Saturday Night through Monday Night/

Confidence:  Medium to High

Quick and intense storm that hits the region tomorrow is expected
to be just east of the area by 00z Sunday with winds relaxing
quickly behind the storm as it races east. High pressure bubble
will settle into the area but with little separation between the
exiting system and another fast moving northern stream storm
entering the Northern Rockies...it's likely that skies will remain
at least partly cloudy for the night. Lows Saturday night will be
quite cold over the new snow cover in the far north. In fact much
of the area will likely experience freezing temperatures as far
south as southern Iowa. It's possible that freezing conditions/
frost may develop if winds decouple enough between 09-12z.
Temperatures should be in the mid 20s north to the lower 30s in
the south. On Sunday, the next system will quickly bring stronger
thetae advection back into Iowa with decent isentropic lift
overcoming the dry air...resulting in showers and possible
isolated thunder in the west during the afternoon hours and into
the overnight. As the system then pulls east...a break in the
rainfall will develop between Monday morning and Tuesday morning.
With the stronger push of warmer air Monday, highs will push back
into the 50s north and in the lower 60s in the south. This should
help melt a the remainder of the snow over northern Iowa.

/Tuesday through Thursday/...
Confidence: Medium

There is better agreement/consensus today with the med range models
from Tuesday into Thursday of next week.  Both the GFS/Euro are now
holding the more significant longwave trough back in the southwest
until Tuesday night...then beginning to kick it east/northeast as a
stronger northern stream H500 wave drops south into the Northern
Rockies. The pattern remains complex with several pieces of energy
ejecting from the system and tracking toward the Central US. With
the Gulf available for increasing moisture input, showers and
thunderstorms are likely to quickly redevelop and lift north into
southern Iowa by Tuesday afternoon into Tuesday night. The first
leading shortwave will move from the southern Plains into northeast
Illinois by 00z Thursday. This will bring a swath of rainfall over
Iowa during the day Wednesday eventually tapering off by afternoon.
A trailing system will take a more southerly track and just clip
southern Iowa with some additional rainfall Thursday afternoon. With
clouds and showers being the predominate mode of weather for midweek
into Thursday, temperatures may need to be lowered on Wednesday. For
now and some uncertainty will use a blended approach.

&&

.AVIATION.../For the 18Z TAFS through 18Z Saturday afternoon/
Issued at 1223 PM CDT Fri Apr 26 2019

Quite conditions for most of Friday. Active weather enters Iowa
late Friday Night and continues through Saturday afternoon. For
the northeast, heavy snow will impact MCW, and may impact ALO.
Other terminals will be impacted by rain. MCW will certainly have
periods of IFR and LIFR. Other locations will experience IFR CIGs
at some point toward the end of the period.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...
Winter Storm Watch from Saturday morning through Saturday
evening for IAZ004>007-016-017-026>028.

&&

SHORT TERM...Podrazik
LONG TERM...REV
AVIATION...Krull
Hazardous weather outlook, Apr 26, 4:26 AM CDT, 10 hours 58 minutes before
Hazardous Weather Outlook
National Weather Service Des Moines IA
426 AM CDT Fri Apr 26 2019

IAZ004>007-016-017-026>028-270930-
Emmet-Kossuth-Winnebago-Worth-Hancock-Cerro Gordo-Franklin-Butler-
Bremer-
426 AM CDT Fri Apr 26 2019

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

River Flood Warnings will continue into at least early next week
for parts of the upper Des Moines River Basin. Please refer to the
National Weather Service website at weather.gov/desmoines for
further details.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

A Winter Storm Watch is in effect for the area Saturday for
moderate to heavy snowfall and strong winds. Please refer to
the National Weather Service website at weather.gov/desmoines for
further details.

A freeze is likely late Saturday night into Sunday morning.

River Flood Warnings will continue into at least early next week
for parts of the upper Des Moines River Basin. Please refer to
the National Weather Service website at weather.gov/desmoines for
further details.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed but snowfall reports from
Saturday's storm would be appreciated.

IAZ015-023-025-033>039-044>050-057>062-070>075-081>086-092>097-
270930-
Palo Alto-Pocahontas-Wright-Sac-Calhoun-Webster-Hamilton-Hardin-
Grundy-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-
426 AM CDT Fri Apr 26 2019

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

On Saturday, especially in the afternoon, winds will increase to
25 to 30 mph with gusts to 40 to 45 mph at times, causing travel
impacts.

A freeze is likely late Saturday night into Sunday morning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

IAZ024-270930-
Humboldt-
426 AM CDT Fri Apr 26 2019

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

River Flood Warnings will continue into at least early next week
for parts of the upper Des Moines River Basin. Please refer to the
National Weather Service website at weather.gov/desmoines for
further details.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

On Saturday, especially in the afternoon, winds will increase to
25 to 30 mph with gusts to 40 to 45 mph at times, causing travel
impacts.

A freeze is likely late Saturday night into Sunday morning.

River Flood Warnings will continue into at least early next week
for parts of the upper Des Moines River Basin. Please refer to
the National Weather Service website at weather.gov/desmoines for
further details.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

REV

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 26, 4:00 AM CDTWinter Storm WatchDMXBremer, Butler, Cerro Gordo, Emmet, Franklin, Hancock and 3 more11 hr
Apr 26, 3:24 PM CDTWinter Weather AdvisoryDMXBlack Hawk, Bremer, Butler, Cerro Gordo, Emmet, Franklin and 9 more24 hr

Nearby

Winter Storm Warnings in Iowa, 2019Every winter storm warning in 2019

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.