Alert archive / Iowa / Flash Flood Watches in 2018

Flash Flood Watch 4, NWS Des Moines, IA

June 20, 201824 counties in Iowa

NWS Des Moines, IA issued this flash flood watch at Jun 20, 2018, 4:28 AM CDT for 24 counties in Iowa. It took effect at Jun 20, 2018, 1:00 PM CDT. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued
Jun 20, 2018, 4:28 AM CDT (09:28 UTC)
In effect from
Jun 20, 2018, 1:00 PM CDT
Expired
Jun 21, 2018, 3:33 AM CDT
In force
15 hr
Issued by
NWS Des Moines, IA
Flood severity
None
All 24 counties

Adair County, IA, Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Dallas County, IA, Emmet County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Madison County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Sac County, IA, Story County, IA, Webster County, IA, Winnebago County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 79 km from the middle of the area, began a volume at 09:29 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 00:00Z, 9.5 hours before the alert went out and 201 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 00:00Z on 2018-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1806 joules per kilogram.LCLLFCEL10008507005003002001001 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, Omaha, NE at 00:00Z on 2018-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.193958Sfc1 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
1806 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
818 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
64 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

Open this sounding in Storm Lab

The text

As transmitted.

390 
WGUS63 KDMX 200928
FFADMX

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Des Moines IA
428 AM CDT Wed Jun 20 2018

...Widespread Heavy Rain This Afternoon into Thursday Morning...

.Thunderstorms look to develop this afternoon and persist well
into the night. Intense rainfall rates and rainfall totals are
likely with these storms. 

IAZ004-005-015-023>025-033>036-044>048-057>060-070>072-201730-
/O.NEW.KDMX.FF.A.0004.180620T1800Z-180621T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emmet-Kossuth-Palo Alto-Pocahontas-Humboldt-Wright-Sac-Calhoun-
Webster-Hamilton-Crawford-Carroll-Greene-Boone-Story-Audubon-
Guthrie-Dallas-Polk-Cass-Adair-Madison-
Including the cities of Estherville, Algona, Emmetsburg, 
Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Humboldt, 
Eagle Grove, Clarion, Belmond, Sac City, Lake View, Odebolt, 
Wall Lake, Schaller, Early, Rockwell City, Manson, Lake City, 
Pomeroy, Fort Dodge, Webster City, Denison, Carroll, Jefferson, 
Boone, Ames, Audubon, Exira, Guthrie Center, Panora, Bayard, 
Casey, Perry, Waukee, Adel, Des Moines, Atlantic, Greenfield, 
Stuart, Adair, Fontanelle, Winterset, and Earlham
428 AM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH IN EFFECT FROM 1 PM CDT THIS AFTERNOON
THROUGH THURSDAY MORNING...

The National Weather Service in Des Moines has issued a

* Flash Flood Watch for portions of central Iowa, north central 
  Iowa, northwest Iowa, south central Iowa, southwest Iowa, and 
  west central Iowa, including the following areas, in central 
  Iowa, Boone, Dallas, Hamilton, Polk, Story, and Webster. In 
  north central Iowa, Humboldt, Kossuth, and Wright. In 
  northwest Iowa, Emmet, Palo Alto, and Pocahontas. In south 
  central Iowa, Madison. In southwest Iowa, Adair and Cass. In 
  west central Iowa, Audubon, Calhoun, Carroll, Crawford, 
  Greene, Guthrie, and Sac. 

* From 1 PM CDT this afternoon through Thursday morning

* A widespread swath of 1.5 to 3 inches of rainfall totals with
  higher amounts over 4 to 5 inches are anticipated this afternoon
  into early Thursday. This heavy rain will fall on top of an
  already saturated ground from recent rains earlier this week. 

* Intense rainfall rates are likely with these storms where 2 to 4
  inches per hour rates will be common this afternoon and tonight.
  Be prepared for water over roads due to rapid rises on creeks
  and streams or even water flowing from farm fields. If a road is
  closed or if water is running over it, please find an alternate
  route. Turn Around Don't Drown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

Podrazik
6 follow-up statements
314 
WGUS63 KDMX 201657
FFADMX

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Des Moines IA
1157 AM CDT Wed Jun 20 2018

...Widespread Heavy Rain This Afternoon Through Tonight...

.Thunderstorms will impact central Iowa, including the Des Moines
metro, this afternoon into the early evening hours. Intense
rainfall rates and rainfall totals are likely with these 
storms. The highest rainfall totals are expected across northern 
to northwestern Iowa, where showers and thunderstorms will 
continue through tonight. 

IAZ016-211200-
/O.EXA.KDMX.FF.A.0004.180620T1800Z-180621T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hancock-
Including the cities of Garner, Britt, and Kanawha
1157 AM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH IN EFFECT THROUGH TONIGHT...

The National Weather Service in Des Moines has expanded the

* Flash Flood Watch to include a portion of north central Iowa, 
  including the following area, Hancock. 

* Through Tonight

* A widespread swath of 1.5 to 3 inches of rainfall with higher 
  amounts over 4 to 5 inches are anticipated through tonight. This
  heavy rain will fall on top of an already saturated ground from
  recent rains earlier this week. 

* Intense rainfall rates are likely with these storms where 2 to 
  4 inches per hour rates will be common this afternoon and 
  tonight. Be prepared for water over roads due to rapid rises 
  on creeks and streams or even water flowing from farm fields. 
  If a road is closed or if water is running over it, please 
  find an alternate route. Turn Around Don't Drown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

IAZ046>048-057>060-070>072-210000-
/O.EXT.KDMX.FF.A.0004.180620T1800Z-180621T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Greene-Boone-Story-Audubon-Guthrie-Dallas-Polk-Cass-Adair-Madison-
Including the cities of Jefferson, Boone, Ames, Audubon, Exira, 
Guthrie Center, Panora, Bayard, Casey, Perry, Waukee, Adel, 
Des Moines, Atlantic, Greenfield, Stuart, Adair, Fontanelle, 
Winterset, and Earlham
1157 AM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH NOW IN EFFECT UNTIL 7 PM CDT THIS EVENING...

The Flash Flood Watch is now in effect for

* Portions of central Iowa, south central Iowa, southwest Iowa, 
  and west central Iowa, including the following areas, in 
  central Iowa, Boone, Dallas, Polk, and Story. In south central 
  Iowa, Madison. In southwest Iowa, Adair and Cass. In west 
  central Iowa, Audubon, Greene, and Guthrie. 

* Until 7 PM CDT this evening

* A widespread swath of 1.5 to 3 inches of rainfall is anticipated
  this afternoon into the early evening hours. This heavy rain 
  will fall on top of an already saturated ground from recent 
  rains earlier this week.
  

* Intense rainfall rates are likely with these storms where 2 to 4
  inches per hour rates will be common. Be prepared for water 
  over roads due to rapid rises on creeks and streams or even 
  water flowing from farm fields. If a road is closed or if water 
  is running over it, please find an alternate route. Turn Around 
  Don't Drown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

IAZ004-005-015-023>025-033>036-044-045-211200-
/O.CON.KDMX.FF.A.0004.180620T1800Z-180621T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emmet-Kossuth-Palo Alto-Pocahontas-Humboldt-Wright-Sac-Calhoun-
Webster-Hamilton-Crawford-Carroll-
Including the cities of Estherville, Algona, Emmetsburg, 
Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, Humboldt, 
Eagle Grove, Clarion, Belmond, Sac City, Lake View, Odebolt, 
Wall Lake, Schaller, Early, Rockwell City, Manson, Lake City, 
Pomeroy, Fort Dodge, Webster City, Denison, and Carroll
1157 AM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH TONIGHT...

The Flash Flood Watch continues for

* Portions of central Iowa, north central Iowa, northwest Iowa, 
  and west central Iowa, including the following areas, in 
  central Iowa, Hamilton and Webster. In north central Iowa, 
  Humboldt, Kossuth, and Wright. In northwest Iowa, Emmet, Palo 
  Alto, and Pocahontas. In west central Iowa, Calhoun, Carroll, 
  Crawford, and Sac. 

* Through Tonight

* A widespread swath of 1.5 to 3 inches of rainfall totals with
  higher amounts over 4 to 5 inches are anticipated this afternoon
  through tonight. This heavy rain will fall on top of an already
  saturated ground from recent rains earlier this week. 

* Intense rainfall rates are likely with these storms where 2 to 
  4 inches per hour rates will be common this afternoon and 
  tonight. Be prepared for water over roads due to rapid rises 
  on creeks and streams or even water flowing from farm fields. 
  If a road is closed or if water is running over it, please 
  find an alternate route. Turn Around Don't Drown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

Kotenberg
776 
WGUS63 KDMX 202013
FFADMX

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Des Moines IA
313 PM CDT Wed Jun 20 2018

...Widespread Heavy Rainfall Through Tonight for Portions of Iowa...

.Thunderstorms will continue to impact central Iowa, including 
the Des Moines metro, through the early evening hours. Intense 
rainfall rates of 1 to 2 inches per hour has been occurring with 
these storms. The highest rainfall totals are expected across 
northern to northwestern Iowa, where showers and thunderstorms 
will continue through tonight.

IAZ057-058-070>072-202115-
/O.CAN.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Audubon-Guthrie-Cass-Adair-Madison-
Including the cities of Audubon, Exira, Guthrie Center, Panora, 
Bayard, Casey, Atlantic, Greenfield, Stuart, Adair, Fontanelle, 
Winterset, and Earlham
313 PM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for portions of south central Iowa,
southwest Iowa, and west central Iowa has been cancelled. Though
light rain may occur tonight, heavy rainfall has moved out of 
this area.

$$

IAZ006-211200-
/O.EXA.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Winnebago-
Including the cities of Forest City and Lake Mills
313 PM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH IN EFFECT THROUGH TONIGHT...

The National Weather Service in Des Moines has expanded the

* Flash Flood Watch to include a portion of north central Iowa, 
  including the following area, Winnebago. 

* Through Tonight

* A widespread total swath of 1.5 to 3 inches of rainfall is 
  forecast through tonight. This heavy rain will fall on top of an
  already saturated ground from recent rains earlier this week. 

* Be prepared for water over roads due to rapid rises on creeks 
  and streams or even water flowing from farm fields. If a road is
  closed or if water is running over it, please find an alternate
  route. Turn Around Don't Drown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

IAZ025-035-036-045-210000-
/O.EXT.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wright-Webster-Hamilton-Carroll-
Including the cities of Eagle Grove, Clarion, Belmond, 
Fort Dodge, Webster City, and Carroll
313 PM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH NOW IN EFFECT UNTIL 7 PM CDT THIS EVENING...

The Flash Flood Watch is now in effect for

* Portions of central Iowa, north central Iowa, and west central 
  Iowa, including the following areas, in central Iowa, Hamilton 
  and Webster. In north central Iowa, Wright. In west central 
  Iowa, Carroll. 

* Until 7 PM CDT this evening

* A widespread total swath of 1.5 to 3 inches of rainfall is 
  anticipated through this evening. This heavy rain will fall on 
  top of an already saturated ground from recent rains earlier 
  this week. 

* Intense rainfall rates are likely with these storms where 2 to 
  4 inches per hour rates will be common this afternoon and 
  tonight. Be prepared for water over roads due to rapid rises 
  on creeks and streams or even water flowing from farm fields. 
  If a road is closed or if water is running over it, please 
  find an alternate route. Turn Around Don't Drown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

IAZ046>048-059-060-210000-
/O.CON.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Greene-Boone-Story-Dallas-Polk-
Including the cities of Jefferson, Boone, Ames, Perry, Waukee, 
Adel, and Des Moines
313 PM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

The Flash Flood Watch continues for

* Portions of central Iowa and west central Iowa, including the 
  following areas, in central Iowa, Boone, Dallas, Polk, and 
  Story. In west central Iowa, Greene. 

* Until 7 PM CDT this evening

* A widespread total swath of 1.5 to 3 inches of rainfall is 
  anticipated through this evening. This heavy rain will fall on 
  top of an already saturated ground from recent rains earlier 
  this week. 

* Intense rainfall rates are likely with these storms where 2 to 
  4 inches per hour rates will be common. Be prepared for water 
  over roads due to rapid rises on creeks and streams or even 
  water flowing from farm fields. If a road is closed or if 
  water is running over it, please find an alternate route. Turn 
  Around Don't Drown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

IAZ004-005-015-016-023-024-033-034-044-211200-
/O.CON.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emmet-Kossuth-Palo Alto-Hancock-Pocahontas-Humboldt-Sac-Calhoun-
Crawford-
Including the cities of Estherville, Algona, Emmetsburg, Garner, 
Britt, Kanawha, Pocahontas, Laurens, Rolfe, Fonda, Gilmore City, 
Humboldt, Sac City, Lake View, Odebolt, Wall Lake, Schaller, 
Early, Rockwell City, Manson, Lake City, Pomeroy, and Denison
313 PM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH TONIGHT...

The Flash Flood Watch continues for

* Portions of north central Iowa, northwest Iowa, and west 
  central Iowa, including the following areas, in north central 
  Iowa, Hancock, Humboldt, and Kossuth. In northwest Iowa, 
  Emmet, Palo Alto, and Pocahontas. In west central Iowa, 
  Calhoun, Crawford, and Sac. 

* Through Tonight

* A widespread total swath of 1.5 to 3 inches of rainfall with 
  higher amounts over 4 to 5 inches are anticipated through 
  tonight. This heavy rain will fall on top of an already 
  saturated ground from recent rains earlier this week. 

* Intense rainfall rates are likely with these storms where 2 to 
  4 inches per hour rates will be common this afternoon and 
  tonight. Be prepared for water over roads due to rapid rises 
  on creeks and streams or even water flowing from farm fields. 
  If a road is closed or if water is running over it, please 
  find an alternate route. Turn Around Don't Drown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

Kotenberg
321 
WGUS63 KDMX 202150
FFADMX

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Des Moines IA
450 PM CDT Wed Jun 20 2018

...Widespread Heavy Rainfall Through Tonight for Northern Iowa...

.Thunderstorms will continue to impact northern and northwestern 
Iowa through tonight. A prolonged period of rain is likely
tonight, with a widespread 1 to 3 inches of total rainfall
accumulation expected.

IAZ045>048-059-060-202300-
/O.CAN.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Carroll-Greene-Boone-Story-Dallas-Polk-
Including the cities of Carroll, Jefferson, Boone, Ames, Perry, 
Waukee, Adel, and Des Moines
450 PM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for portions of central Iowa and west
central Iowa has been cancelled. Heavy rainfall has ended for this
area.

$$

IAZ044-202300-
/O.CAN.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Crawford-
Including the city of Denison
450 PM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for a portion of west central Iowa has been
cancelled. Heavy rainfall has ended for this area.

$$

IAZ034-210000-
/O.EXT.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Calhoun-
Including the cities of Rockwell City, Manson, Lake City, 
and Pomeroy
450 PM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH NOW IN EFFECT UNTIL 7 PM CDT THIS EVENING...

The Flash Flood Watch is now in effect for

* A portion of west central Iowa, including the following area, 
  Calhoun. 

* Until 7 PM CDT this evening

* A widespread total swath of 1.5 to 3 inches of rainfall is
  anticipated through 7 pm. This heavy rain will fall on top of 
  an already saturated ground from recent rains earlier this week.
  

* Be prepared for water over roads due to rapid rises on creeks 
  and streams or even water flowing from farm fields. If a road is
  closed or if water is running over it, please find an alternate
  route. Turn Around Don't Drown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

IAZ004>006-015-016-023-024-033-211200-
/O.CON.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emmet-Kossuth-Winnebago-Palo Alto-Hancock-Pocahontas-Humboldt-Sac-
Including the cities of Estherville, Algona, Forest City, 
Lake Mills, Emmetsburg, Garner, Britt, Kanawha, Pocahontas, 
Laurens, Rolfe, Fonda, Gilmore City, Humboldt, Sac City, 
Lake View, Odebolt, Wall Lake, Schaller, and Early
450 PM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH TONIGHT...

The Flash Flood Watch continues for

* Portions of north central Iowa, northwest Iowa, and west 
  central Iowa, including the following areas, in north central 
  Iowa, Hancock, Humboldt, Kossuth, and Winnebago. In northwest 
  Iowa, Emmet, Palo Alto, and Pocahontas. In west central Iowa, 
  Sac. 

* Through Tonight

* A widespread total swath of 1.5 to 3 inches of rainfall with
  higher amounts over 4 inches is anticipated through tonight. 
  This heavy rain will fall on top of an already saturated ground 
  from recent rains earlier this week. 

* Be prepared for water over roads due to rapid rises on creeks 
  and streams or even water flowing from farm fields. If a road is
  closed or if water is running over it, please find an alternate
  route. Turn Around Don't Drown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

IAZ025-035-036-210000-
/O.CON.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wright-Webster-Hamilton-
Including the cities of Eagle Grove, Clarion, Belmond, 
Fort Dodge, and Webster City
450 PM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

The Flash Flood Watch continues for

* Portions of central Iowa and north central Iowa, including the 
  following areas, in central Iowa, Hamilton and Webster. In 
  north central Iowa, Wright. 

* Until 7 PM CDT this evening

* A widespread total swath of 1.5 to 3 inches of rainfall is 
  anticipated through this evening. This heavy rain will fall on 
  top of an already saturated ground from recent rains earlier 
  this week. 

* Be prepared for water over roads due to rapid rises on creeks 
  and streams or even water flowing from farm fields. If a road is
  closed or if water is running over it, please find an alternate
  route. Turn Around Don't Drown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

Kotenberg
428 
WGUS63 KDMX 202351
FFADMX

Flood Watch
National Weather Service Des Moines IA
651 PM CDT Wed Jun 20 2018

...Widespread Heavy Rainfall Through Tonight for Northern Iowa...

.Thunderstorms will continue to impact northern and northwestern
Iowa through tonight. A prolonged period of rain is likely
tonight, with a widespread 1 to 3 inches of total rainfall
accumulation expected.

IAZ025-034>036-210100-
/O.EXP.KDMX.FF.A.0004.000000T0000Z-180621T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wright-Calhoun-Webster-Hamilton-
Including the cities of Eagle Grove, Clarion, Belmond, 
Rockwell City, Manson, Lake City, Pomeroy, Fort Dodge, 
and Webster City
651 PM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH WILL EXPIRE AT 7 PM CDT THIS EVENING...

The Flash Flood Watch for portions of central Iowa, north central
Iowa, and west central Iowa will expire at 7 PM CDT this evening.
Heavy precipitation has moved out of this area.

$$

IAZ004>006-015-016-023-024-033-211200-
/O.CON.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emmet-Kossuth-Winnebago-Palo Alto-Hancock-Pocahontas-Humboldt-Sac-
Including the cities of Estherville, Algona, Forest City, 
Lake Mills, Emmetsburg, Garner, Britt, Kanawha, Pocahontas, 
Laurens, Rolfe, Fonda, Gilmore City, Humboldt, Sac City, 
Lake View, Odebolt, Wall Lake, Schaller, and Early
651 PM CDT Wed Jun 20 2018

...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY MORNING...

The Flash Flood Watch continues for

* Portions of north central Iowa, northwest Iowa, and west 
  central Iowa, including the following areas, in north central 
  Iowa, Hancock, Humboldt, Kossuth, and Winnebago. In northwest 
  Iowa, Emmet, Palo Alto, and Pocahontas. In west central Iowa, 
  Sac. 

* Through Thursday morning

* A widespread total swath of 1.5 to 3 inches of rainfall with
  higher total amounts over 4 inches is anticipated through 
  tonight. This heavy rain will fall on top of an already 
  saturated ground from recent rains earlier this week. 

* Be prepared for water over roads due to rapid rises on creeks 
  and streams or even water flowing from farm fields. If a road 
  is closed or if water is running over it, please find an 
  alternate route. Turn Around Don't Drown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

Kotenberg
813 
WGUS63 KDMX 210512
FFADMX

Flood Watch
National Weather Service Des Moines IA
1212 AM CDT Thu Jun 21 2018

...Heavy Rainfall Overnight for Northern Iowa...

.Thunderstorms will continue to impact northern and northwestern 
Iowa overnight. 

IAZ023-024-033-210615-
/O.CAN.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pocahontas-Humboldt-Sac-
Including the cities of Pocahontas, Laurens, Rolfe, Fonda, 
Gilmore City, Humboldt, Sac City, Lake View, Odebolt, Wall Lake, 
Schaller, and Early
1212 AM CDT Thu Jun 21 2018

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for portions of north central Iowa,
northwest Iowa, and west central Iowa has been cancelled. The
threat for heavy rain leading to flash flooding has ended.
Therefore, the flash flood watch has been cancelled. 

$$

IAZ004>006-015-016-211200-
/O.CON.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emmet-Kossuth-Winnebago-Palo Alto-Hancock-
Including the cities of Estherville, Algona, Forest City, 
Lake Mills, Emmetsburg, Garner, Britt, and Kanawha
1212 AM CDT Thu Jun 21 2018

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 AM CDT THIS
MORNING...

The Flash Flood Watch continues for

* Portions of north central Iowa and northwest Iowa, including 
  the following areas, in north central Iowa, Hancock, Kossuth, 
  and Winnebago. In northwest Iowa, Emmet and Palo Alto. 

* Until 7 AM CDT this morning

* Additional rainfall of around 1 inch will be possible during 
  the overnight hours. Localized heavier amounts up to two inches 
  may occur. This heavy rain will fall on top of an already 
  saturated ground from recent rains earlier this week. 

* Be prepared for water over roads due to rapid rises on creeks 
  and streams or even water flowing from farm fields. If a road 
  is closed or if water is running over it, please find an 
  alternate route. Turn Around Don't Drown. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

AK/MJB
191 
WGUS63 KDMX 210833
FFADMX

Flood Watch
National Weather Service Des Moines IA
333 AM CDT Thu Jun 21 2018

IAZ004>006-015-016-210945-
/O.CAN.KDMX.FF.A.0004.000000T0000Z-180621T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Emmet-Kossuth-Winnebago-Palo Alto-Hancock-
Including the cities of Estherville, Algona, Forest City, 
Lake Mills, Emmetsburg, Garner, Britt, and Kanawha
333 AM CDT Thu Jun 21 2018

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for portions of north central Iowa and
northwest Iowa has been cancelled. Heavy rainfall is longer a
threat although there will be periods of light to moderate
rainfall still today. With the absence of the heavy rain threat,
the flash flood watch was cancelled.

$$

FAB

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Jun 20, 4:21 AM CDT, 7 minutes earlier.

Area forecast discussion, Jun 20, 4:21 AM CDT, 7 minutes before
Area Forecast Discussion
National Weather Service Des Moines IA
421 AM CDT Wed Jun 20 2018

.SHORT TERM.../Today through Tonight/
Issued at 421 AM CDT Wed Jun 20 2018

Ongoing cluster of storms over northern Iowa are slowly weakening
with respect rainfall rates. Dual pol and MRMS still suggest 1-2
inch per hour rates. Earlier in the night, dual pol instantaneous
rates range from 3 to 5 inches per hour while MRMS was capped out
around 2 inches. This was likely due to MRMS depicting some hail
within this line of storms that transitioned northward through
Highway 20 corridor. However, MRMS precipitation estimates a decent
rain band that ranged from 2-3 inches over southeast Calhoun into
southern Webster County. The 20.07z HRRR has the best handle on the
radar trends this morning and slowly diminishes the current cluster
by around 12z. However, some redevelop looks possible during the
remainder of the morning hours over northern Iowa but low confidence
with additional flash flooding as coverage seems minimal.

The next concern of the forecast period was focused on widespread
storms later today into tonight across central to northern Iowa.  An
area of low looks to develop in the vicinity of NW Missouri, SE
Nebraska, NE Kansas, and SW Iowa by around 18z this afternoon. This
coupled with a strong 500mb shortwave trough to dig across Nebraska
and northern Iowa will ignite storms along a warm front extending
from southeast Iowa northwest to the west-central portions of the
CWA. The NAM/GFS and the 20.00z HREF look to have a good handle on
the situations this afternoon and tonight. A widespread swath of 2 to
2.50" precipitable water values stretch from around Ottuwma northwest
through Des Moines/Ames and into the northwest portions of the CWA.
Warm layer cloud depths of 4000-4500 meters with moderate to strong
moisture transport suggest more efficient rain producers in the
aforementioned location. Increased QPF over the area as expecting a
swatch of 1.5 to 3 inches from the central portions of the CWA
northwest to between Carroll and Estherville. With the HREF
depicting amounts over 4 to 5 inches, certainly these types of
rainfall amounts will cause some flash flood concerns.  Thus,
confident in the heavy rain setup (and with the recent rains over
the past few days) to issue a Flash Flood Watch this afternoon into
Thursday morning. This coincides with Moderate Risk of excessive
rainfall via WPC.

Lower confidence with any widespread severe storms today into
tonight as shear profiles remain weak.  Instability tries to increase
over southern Iowa this afternoon south of the boundary and
certainly cannot rule out some brief elevated hail storms this
afternoon into the evening.

.LONG TERM.../Thursday through Tuesday/
Issued at 421 AM CDT Wed Jun 20 2018

Upper trough moving through the central Plains today will continue
to deepen and close off over the state Thursday into Friday while
continuing to wobble around the region. This will allow
precipitation chances to continue across the state Thursday into
Friday with bands of showers and some thunderstorms expected to
rotate through the forecast area. Instability is weaker across the
area with the upper trough overhead so went more with some shower
wording with more of a slight chance for thunder Thursday into
Friday. With the lack of instability the threat for heavy rainfall
to wane some for Thursday into Friday. Otherwise the upper trough
to push east into the Ohio Valley region by Friday night with
another shortwave trough dropping through the state by late
Saturday night into Sunday. This could bring another chance for
some scattered showers and thunderstorms. A stronger upper level
trough to then deepen as it moves east through the region Monday
into Wednesday of next week. This system will again bring
additional chances for precipitation to the state. Therefore
expecting a fairly wet period through the next 7 days. Will have
to assess the potential for additional heavy rain threats with the
system early next week as any flooding issues from the next 24
hours could be further exacerbated by continued precipitation
chances this weekend and again next week.

As for temperatures, highs to remain cooler Thursday into Friday
with the clouds/precipitation in place and the upper trough
rotating over the state with highs mainly in the low to mid 70s,
with even a few upper 60s possible Thursday. Temperatures to then
warm back to around 80 for Saturday through Monday and then warm
back into the 80s toward the middle of next week.

&&

.AVIATION.../For the 06Z TAFS through 06Z Wednesday night/
Issued at 1201 AM CDT Wed Jun 20 2018

While VFR conditions are lingering over south central Iowa
terminals, widespread MVFR and IFR ceilings are expected to spread
from northern Iowa southward. Scattered showers and thunderstorms
are expected, but low confidence continues in exact location and
timing in the weak flow so any mention of showers/storms is vicinity
through 18z. Thereafter, there is no precipitation mentioned, but
it is likely this will need to be added once exact placement of
rain is determined.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch from 1 PM CDT this afternoon through Thursday
morning for IAZ004-005-015-023>025-033>036-044>048-057>060-
070>072.

&&

SHORT TERM...Podrazik
LONG TERM...Beerends
AVIATION...Ansorge
Hazardous weather outlook, Jun 20, 4:23 AM CDT, 5 minutes before
Hazardous Weather Outlook
National Weather Service Des Moines IA
423 AM CDT Wed Jun 20 2018

IAZ004-005-015-023>025-033>036-044>048-057-058-070>072-211030-
Emmet-Kossuth-Palo Alto-Pocahontas-Humboldt-Wright-Sac-Calhoun-
Webster-Hamilton-Crawford-Carroll-Greene-Boone-Story-Audubon-
Guthrie-Cass-Adair-Madison-
423 AM CDT Wed Jun 20 2018

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and Tonight

A Flash Flood Watch is in effect for the area. Please refer to
the National Weather Service website at weather.gov/desmoines for
further details.

Thunderstorms are likely today into tonight. Heavy rainfall is
expected. An isolated strong to severe storm will be possible
mainly south of Highway 20 this afternoon and evening.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

There is a chance for weak thunderstorms across the area Thursday
into Friday. The severe weather threat is minimal. Thunderstorm
chances continue off and on through the weekend into early next
week. The threat of severe weather will be determined in the
coming days.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed later today and tonight. Reports
of any flooding or heavy rainfall are always appreciated.

IAZ006-007-016-017-026>028-037>039-049-050-061-062-073>075-
081>086-092>097-211030-
Winnebago-Worth-Hancock-Cerro Gordo-Franklin-Butler-Bremer-Hardin-
Grundy-Black Hawk-Marshall-Tama-Jasper-Poweshiek-Warren-Marion-
Mahaska-Adams-Union-Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-
Decatur-Wayne-Appanoose-Davis-
423 AM CDT Wed Jun 20 2018

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and Tonight

Thunderstorms are likely today into tonight. Heavy rainfall will
be possible with the thunderstorms. An isolated strong to severe
storm will be possible mainly south of Highway 20 this afternoon
and evening.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

There is a chance for weak thunderstorms across the area Thursday
into Friday. The severe weather threat is minimal. Thunderstorm
chances continue off and on through the weekend into early next
week. The threat of severe weather will be determined in the
coming days.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed later today and tonight. Reports
of heavy rainfall are always appreciated.

IAZ059-060-211030-
Dallas-Polk-
423 AM CDT Wed Jun 20 2018

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

A Flash Flood Watch and a few River Flood Warnings are in effect
for the area. Please refer to the National Weather Service website
at weather.gov/desmoines for further details.

Thunderstorms are likely today into tonight. Heavy rainfall is
expected. An isolated strong to severe storm will be possible
this afternoon and evening.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

There is a chance for weak thunderstorms across the area Thursday
into Friday. The severe weather threat is minimal. Thunderstorm
chances continue off and on through the weekend into early next
week. The threat of severe weather will be determined in the
coming days.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed later today and tonight. Reports
of any flooding or heavy rainfall are always appreciated.

MJB

In the hours before

Special weather statement, Jun 20, 1:19 AM CDT, 3 hours 9 minutes before
Special Weather Statement
National Weather Service Des Moines IA
119 AM CDT WED JUN 20 2018

IAZ044-045-200715-
Carroll IA-Crawford IA-
119 AM CDT WED JUN 20 2018

...Heavy Rain to Impact Carroll County Overnight...

At 118 AM CDT, Doppler radar was tracking a strong thunderstorm 7
miles northeast of Manning, or 7 miles southwest of Carroll, moving
north at 15 mph.

Rainfall amounts up to two inches will be possible with this storm.
Street flooding and small creeks may quickly rise as a result of the
heavy rain.

Locations impacted include...
Carroll, Manning, Glidden, Arcadia, Breda, Templeton, Westside,
Dedham, Halbur, Lidderdale, Lanesboro, Willey, Ralston, Aspinwall,
Hobbs County Park, Arthur N Neu Airport, Manning Municipal Airport
and Swan Lake State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4221 9511 4221 9463 4202 9463 4186 9487
      4186 9500 4188 9516
TIME...MOT...LOC 0618Z 192DEG 12KT 4201 9499

Podrazik
Special weather statement, Jun 20, 2:17 AM CDT, 2 hours 11 minutes before
Special Weather Statement
National Weather Service Des Moines IA
217 AM CDT WED JUN 20 2018

IAZ035-036-047-200815-
Hamilton IA-Boone IA-Webster IA-
217 AM CDT WED JUN 20 2018

...Strong Winds to Impact Portions of Northern Iowa...

At 217 AM CDT, Doppler radar was tracking a strong thunderstorm 11
miles east of Gowrie, or 15 miles south of Fort Dodge, moving
southeast at 20 mph.

Wind gusts of 50 to 55 mph will be possible with this storm.

Locations impacted include...
Boone, Dayton, Stratford, Stanhope, Lehigh, Harcourt, Pilot Mound,
Fraser, Boone Municipal Airport, Brushy Creek St Recreation Area,
Dolliver Memorial State Park and Woodman Hollow State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4225 9365 4221 9369 4221 9370 4220 9370
      4203 9385 4228 9423 4243 9409
TIME...MOT...LOC 0717Z 304DEG 16KT 4231 9407

Podrazik
Local storm report, Jun 20, 3:36 AM CDT, 52 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
336 AM CDT WED JUN 20 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0329 AM     FLASH FLOOD      3 N FARNHAMVILLE        42.32N 94.42W
06/20/2018                   CALHOUN            IA   LAW ENFORCEMENT

            A ONE MILE STRETCH OF P21 (ZEARING AVE)
            CLOSED DUE TO WATER OVER THE ROAD. DEPTH
            UNKNOWN AT THIS TIME, BUT CALHOUN COUNTY
            SHERIFF'S DEPUTY FELT STRONGLY ENOUGH THAT
            IT NEEDED BARRICADES. LOCATION BETWEEN 320TH
            AND 330TH AND LIKELY DUE TO HARDIN CREEK.

&&

KLP

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 19, 8:39 PM CDTRiver Flood WarningDMXPolk9 days
Jun 19, 8:39 PM CDTRiver Flood WarningDMXPolk8 days
Jun 20, 1:19 AM CDTSpecial Weather StatementDMXCarroll56 min
Jun 20, 2:12 AM CDTFlash Flood WarningDMXCalhoun, Webster5 hr
Jun 20, 2:17 AM CDTSpecial Weather StatementDMXBoone58 min
Jun 20, 10:38 AM CDTRiver Flood WarningDMXWebster19 days
Jun 20, 10:38 AM CDTRiver Flood WarningDMXBoone, Hamilton, Webster3 days
Jun 20, 10:43 AM CDTRiver Flood WatchDMXDallas, Polk6 days
Jun 20, 10:43 AM CDTRiver Flood WatchDMXPolk6 days
Jun 20, 10:43 AM CDTRiver Flood WatchDMXBlack Hawk34 hr
Jun 20, 10:43 AM CDTRiver Flood WatchDMXPolk, Story7 hr
Jun 20, 10:43 AM CDTRiver Flood WatchDMXJasper, Marion, Polk10 hr
Jun 20, 10:43 AM CDTRiver Flood WatchDMXEmmet6 hr
Jun 20, 10:43 AM CDTRiver Flood WatchDMXHumboldt10 hr
Jun 20, 12:49 PM CDTSevere Thunderstorm WarningDMXJasper, Mahaska, Marion41 min
Jun 20, 2:16 PM CDTTornado WarningDMXCarroll, Greene29 min
Jun 20, 2:22 PM CDTTornado WarningDMXBoone, Dallas, Greene25 min
Jun 20, 2:26 PM CDTSpecial Weather StatementDMXDavis, Wapello49 min
Jun 20, 2:43 PM CDTSpecial Weather StatementDMXPolk, Story62 min
Jun 20, 2:43 PM CDTTornado WarningDMXWebster47 min
Jun 20, 2:46 PM CDTTornado WarningDMXCalhoun, Greene17 min
Jun 20, 3:02 PM CDTTornado Warning Tornado observedDMXHardin11 min
Jun 20, 3:16 PM CDTTornado Warning Tornado observedDMXHardin29 min
Jun 20, 3:18 PM CDTTornado Warning Tornado observedDMXGrundy, Hardin57 min
Jun 20, 3:21 PM CDTTornado WarningDMXHumboldt, Kossuth39 min
Jun 20, 3:24 PM CDTTornado WarningDMXWebster37 min
Jun 20, 3:57 PM CDTTornado WarningDMXGrundy, Hardin33 min
Jun 20, 4:06 PM CDTSevere Thunderstorm WarningDMXHancock, Humboldt, Kossuth, Wright39 min
Jun 20, 4:13 PM CDTFlash Flood WarningDMXHumboldt, Kossuth, Palo Alto, Pocahontas6 hr
Jun 20, 4:25 PM CDTFlash Flood WarningDMXHumboldt, Kossuth6 hr
Jun 20, 5:06 PM CDTRiver Flood WarningDMXEmmet38 days
Jun 20, 5:20 PM CDTRiver Flood WarningDMXPolk, Story3 hr
Jun 20, 5:34 PM CDTTornado Warning Tornado observedDMXMahaska, Monroe, Wapello41 min
Jun 20, 6:05 PM CDTSevere Thunderstorm WarningDMXDavis, Wapello41 min
Jun 20, 6:45 PM CDTSevere Thunderstorm WarningDMXStory30 min

Nearby

Flash Flood Watches in Iowa, 2018Every flash flood watch in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.