Alert archive / Iowa / River Flood Watches in 2018

River Flood Watch 45, NWS Des Moines, IA

September 20, 2018Tama County, Iowa

NWS Des Moines, IA issued this river flood watch at Sep 20, 2018, 10:46 AM CDT for Tama County, Iowa. It took effect at Sep 25, 2018, 4:00 AM CDT. It was in force for .

The area

The counties it named.

The facts

Issued: Sep 20, 2018, 10:46 AM CDT (15:46 UTC)
In effect from: Sep 25, 2018, 4:00 AM CDT
Expired: Sep 23, 2018, 9:20 PM CDT
In force
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Flood severity: None

County Tama County, IA

The radar

The Des Moines radar (KDMX), 106 km from the middle of the area, began a volume at 15:48 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 river

Written for the forecast point Iowa River near Tama Hwy E49 (TMAI4). The gauge peaked at 12.07 ft at Sep 24, 2018, 9:00 PM CDT.

Action stage: 11 ft
Minor stage: 12.5 ft
Moderate stage: 13 ft
Major stage: 14 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 05451770, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

The local office's own words before this river 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 river flood watch went out at Sep 20, 6:45 AM CDT, 4 hours 1 minute earlier.

Area forecast discussion, Sep 20, 6:45 AM CDT, 4 hours 1 minute before

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Hazardous weather outlook, Sep 20, 4:34 AM CDT, 6 hours 12 minutes before

Hazardous Weather Outlook
National Weather Service Des Moines IA
434 AM CDT Thu Sep 20 2018

IAZ004>007-015>017-211000-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
434 AM CDT Thu Sep 20 2018

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

Severe thunderstorms are possible late this afternoon into
this evening. The main severe threats are damaging winds and
possibly a few tornadoes, large hail is a secondary threat.
locally heavy rainfall is also possible.

Gusty non-thunderstorm winds of 20 to 30 mph with gusts to 40 mph
or more are expected today.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Intermittent thunderstorm chances return to the forecast Monday
through much of next week. At this time the threat of severe
weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is expected late this afternoon into this
evening.

IAZ023>028-033>039-211000-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun-
Webster-Hamilton-Hardin-Grundy-Black Hawk-
434 AM CDT Thu Sep 20 2018

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

Severe thunderstorms are possible late this afternoon into
tonight. The main severe threats are damaging winds and possibly
a few tornadoes, large hail is a secondary threat. locally heavy
rainfall is also possible.

Gusty non-thunderstorm winds of 20 to 30 mph with gusts to 40 mph
or more are expected today.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Intermittent thunderstorm chances return to the forecast Monday
through much of next week. At this time the threat of severe
weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is expected late this afternoon into this
evening.

IAZ044>050-211000-
Crawford-Carroll-Greene-Boone-Story-Marshall-Tama-
434 AM CDT Thu Sep 20 2018

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

Strong to severe thunderstorms are possible this evening into
tonight. The main severe threats are damaging winds and possibly
a tornado, large hail is a secondary threat. locally heavy
rainfall is also possible.

Gusty non-thunderstorm winds of 20 to 30 mph with gusts to 40 mph
or more are expected today.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Intermittent thunderstorm chances return to the forecast Monday
through much of next week. At this time the threat of severe
weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this evening into tonight.

IAZ057>062-070>075-081>086-092>097-211000-
Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass-Adair-Madison-
Warren-Marion-Mahaska-Adams-Union-Clarke-Lucas-Monroe-Wapello-
Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis-
434 AM CDT Thu Sep 20 2018

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

A strong to possibly severe thunderstorm will be possible this
evening into tonight. The main severe threat will be damaging
winds. An isolated tornado or large hail cannot be ruled out.
Locally heavy rainfall is also possible.

Gusty non-thunderstorm winds of 20 to 30 mph with gusts to 40 mph
or more are expected today.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Intermittent thunderstorm chances return to the forecast Monday
through much of next week. At this time the threat of severe
weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this evening into tonight.

MJB

In the hours before

Local storm report, Sep 20, 10:34 AM CDT, 12 minutes before

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Local storm report, Sep 20, 10:36 AM CDT, 10 minutes before

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Local storm report, Sep 20, 10:37 AM CDT, 9 minutes before

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Local storm report, Sep 20, 10:40 AM CDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1040 AM CDT THU SEP 20 2018

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

0700 AM     HEAVY RAIN       2 WNW GRUVER            43.41N 94.75W
09/20/2018  M3.93 INCH       EMMET              IA   ASOS

            24 HOUR RAINFALL AT ESTHERVILLE AIRPORT.

&&

FOWLE

Local storm report, Sep 20, 10:41 AM CDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1041 AM CDT THU SEP 20 2018

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

0700 AM     HEAVY RAIN       3 NE CLEAR LAKE         43.16N 93.33W
09/20/2018  M3.47 INCH       CERRO GORDO        IA   ASOS

            24 HOUR RAINFALL AT MASON CITY AIRPORT.

&&

FOWLE

Local storm report, Sep 20, 10:45 AM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1045 AM CDT THU SEP 20 2018

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

0700 AM     HEAVY RAIN       2 SW HAMPTON            42.72N 93.23W
09/20/2018  M3.64 INCH       FRANKLIN           IA   AWOS

            24 HOUR RAINFALL AT HAMPTON AIRPORT.

&&

FOWLE

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 19, 8:49 PM CDT	Severe Thunderstorm Warning	DMX	Palo Alto, Pocahontas	25 min
Sep 19, 9:54 PM CDT	River Flood Warning	DMX	Cerro Gordo, Floyd, Worth	3 days
Sep 19, 9:54 PM CDT	River Flood Warning	DMX	Emmet	15 days
Sep 19, 9:57 PM CDT	River Flood Watch	DMX	Humboldt, Kossuth	7 days
Sep 19, 10:22 PM CDT	Flash Flood Warning	DMX	Franklin, Wright	6 hr
Sep 20, 4:14 AM CDT	Areal Flood Warning	DMX	Franklin, Wright	24 hr
Sep 20, 4:55 AM CDT	River Flood Warning	DMX	Wright	6 days
Sep 20, 4:55 AM CDT	River Flood Warning	DMX	Humboldt	9 days
Sep 20, 4:57 AM CDT	River Flood Watch	DMX	Webster	24 hr
Sep 20, 4:57 AM CDT	River Flood Watch	DMX	Palo Alto, Pocahontas	6 days
Sep 20, 8:51 AM CDT	Areal Flood Warning	DMX	Cerro Gordo, Emmet, Hancock, Kossuth, Palo Alto, Winnebago and 1 more	48 hr
Sep 20, 11:23 AM CDT	River Flood Warning	DMX	Webster	7 days
Sep 20, 11:23 AM CDT	River Flood Warning	DMX	Palo Alto, Pocahontas	5 days
Sep 20, 11:23 AM CDT	River Flood Warning	DMX	Humboldt, Kossuth	8 days
Sep 20, 5:13 PM CDT	Severe Thunderstorm Warning	DMX	Emmet	47 min
Sep 20, 5:19 PM CDT	Special Weather Statement	DMX	Calhoun, Crawford, Kossuth, Palo Alto, Pocahontas, Sac	56 min
Sep 20, 5:41 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Kossuth, Palo Alto	34 min
Sep 20, 5:43 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Carroll, Crawford, Pocahontas, Sac	47 min
Sep 20, 5:49 PM CDT	Severe Thunderstorm Warning	DMX	Humboldt, Kossuth, Palo Alto, Pocahontas	26 min
Sep 20, 5:52 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Kossuth, Winnebago, Worth	38 min
Sep 20, 6:17 PM CDT	Special Weather Statement	DMX	Humboldt, Pocahontas	58 min
Sep 20, 6:25 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Hancock, Humboldt, Kossuth, Pocahontas, Webster and 1 more	50 min
Sep 20, 6:28 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Hancock, Kossuth, Winnebago, Worth	47 min
Sep 20, 6:41 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Hamilton, Webster, Wright	34 min
Sep 20, 6:59 PM CDT	Special Weather Statement	DMX	Boone, Greene	61 min

Nearby

River Flood Watches in Iowa, 2018 Every river 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; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.