Flash Flood Warning 32, NWS Des Moines, IA

885 
WGUS73 KDMX 020855 RRA
FFSDMX

Flash Flood Statement
National Weather Service Des Moines IA
355 AM CDT SUN SEP 2 2018

IAC127-169-020905-
/O.CAN.KDMX.FF.W.0032.000000T0000Z-180902T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Story IA-Marshall IA-
355 AM CDT SUN SEP 2 2018

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN STORY AND MARSHALL
COUNTIES IS CANCELLED...

The heavy rain has ended. Flash flooding is no longer expected to 
pose a threat but flooding will still be ongoing. Please continue to 
heed any remaining road closures and avoid flooded areas.

A County Wide Flood Warning is now in effect until 1245 pm this 
Sunday and replaces the previous Flash Flood Warnings in effect 
across the region. 

LAT...LON 4187 9277 4186 9355 4202 9355 4221 9277

$$

REV

Area Forecast Discussion
National Weather Service Des Moines IA
1222 AM CDT Sun Sep 2 2018

...Updated 06z Aviation...

.DISCUSSION.../Tonight through Saturday/
Issued at 323 PM CDT Sat Sep 1 2018

Very active weather pattern to persist through much of the forecast
period. Large sub-tropical high over the east central CONUS will
move slightly east and north over the next 24 hrs and will allow the
surface boundary to lift slightly north and focus over central Iowa.
This boundary will be the area of focus for thunderstorms tonight
through Monday. Very heavy rainfall remains the primary concern
during this period as repeated rounds of thunderstorms capable of
producing heavy rainfall.

Currently there is a lull in the thunderstorm activity. Weak surface
boundary was located from near Omaha to Des Moines then northeast
towards Waterloo. This boundary may settle a bit south tonight
before the aforementioned push back to the north. Another wave of
theta-e advection will lift into central Iowa late this afternoon
and into the early evening. This will moving into an area of nearly
uncapped instability near the surface boundary. This forcing may be
enough to trigger a few thunderstorms during this time period and
could have the potential for some large hail and possibly a damaging
wind gusts. Additional storms are expected to develop over Kansas
late this afternoon then the system may become linear and lift
northeast along the boundary and into central Iowa overnight. PWAT
values will remain near to above 2 inches along the boundary as deep
layer moisture advection continues with Gulf flow in the low levels
thanks to the high to the east and monsoonal flow in the mid-levels.
Based on heavy rain potential overnight and recent heavy rains along
with expected focus overnight, will be reorienting the Flash Flood
watch farther north tonight.

Likely will need additional headlines the next few days over central
Iowa for heavy rainfall. The rainfall potential by Tuesday will
shift further northwest on Tuesday with heavy rain remaining
possible. The upper flow will flatted on Wednesday with westerly
flow prevailing through the rest of the period. This will allow the
boundary to drop south but should hangup over southern Iowa/northern
Missouri as it becomes parallel to the upper flow. This should bring
lower threat for thunderstorms north while the south remains active.
Temperature by the end of the week will drop into the 70s.

&&

.AVIATION.../For the 06Z TAFS through 06Z Sunday night/
Issued at 1219 AM CDT Sun Sep 2 2018

Rain showers and thunderstorms will continue move across northern
and central Iowa overnight and into the morning hours. The severe
threat has diminished. Main challenge will be rain showers
throughout Sunday afternoon, guidance still continues to depict
widespread rain coverage. MVFR conditions will prevail for the
most part, though a brief periods of IFR cannot completely be
ruled out. Wet pattern will continue beyond the period.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch until 7 AM CDT this morning for IAZ025>028-
034>039-045>050-057>062-070>075-081>086-092>097.

&&

DISCUSSION...Donavon
AVIATION...Krull

Hazardous Weather Outlook
National Weather Service Des Moines IA
354 PM CDT Sat Sep 1 2018

IAZ004>007-015>017-023-024-033-044-081>086-092>097-022100-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Sac-Crawford-Adams-Union-Clarke-Lucas-Monroe-
Wapello-Taylor-Ringgold-Decatur-Wayne-Appanoose-Davis-
354 PM CDT Sat Sep 1 2018

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...This afternoon and tonight

Periods of strong to severe storms will be possible this evening
and overnight, especially over the southern half to two thirds of
the state. Main threats will be for damaging winds and heavy
rainfall, though severe hail is not out of the question. Heavy
rainfall may cause localized water issues.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

There will be periods of thunderstorms, especially during the
overnight hours throughout this period. Widespread severe weather
is not likely but a few storms from time to time may be strong to
severe. Damaging winds will likely be the main threats with any
stronger storms.

Heavy rainfall will be possible with any thunderstorm. River
flooding and flash flood threats could increase Sunday into next
week due to the continued heavy rain threat.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected though severe weather and
rainfall reports are appreciated.

IAZ025>028-034>039-045>050-057>062-070>075-022100-
Wright-Franklin-Butler-Bremer-Calhoun-Webster-Hamilton-Hardin-
Grundy-Black Hawk-Carroll-Greene-Boone-Story-Marshall-Tama-
Audubon-Guthrie-Dallas-Polk-Jasper-Poweshiek-Cass-Adair-Madison-
Warren-Marion-Mahaska-
354 PM CDT Sat Sep 1 2018

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...This afternoon and tonight

Strong to possibly severe thunderstorms and heavy rainfall are
possible this evening and overnight. The main threats will be for
heavy rainfall and damaging winds, though large hail is not out
of the question. Areas that see heavy rainfall may experience
exacerbated water issues since many have received recent moderate
to heavy rainfall.

A flash flood watch is in effect for the area, please visit
www.weather.gov/desmoines for more details.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

There will be periods of thunderstorms, especially during the
overnight hours throughout this period. Widespread severe weather
is not likely but a few storms from time to time may be strong to
severe. Damaging winds will likely be the main threats with any
stronger storms.

Heavy rainfall will be possible with any thunderstorm. River
flooding and flash flood threats could increase Sunday into next
week due to the continued heavy rain threat.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected though severe weather and rainfall
reports are appreciated.

CURTIS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1048 PM CDT SAT SEP 1 2018

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

0730 PM     HAIL             2 N URBANDALE           41.66N 93.74W
09/01/2018  E1.25 INCH       POLK               IA   PUBLIC

&&

AK

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1111 PM CDT SAT SEP 1 2018

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

1101 PM     HAIL             2 S AMES                41.99N 93.62W
09/01/2018  E0.88 INCH       STORY              IA   PUBLIC

            VIA SOCIAL MEDIA.

&&

BSS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1116 PM CDT SAT SEP 1 2018

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

1055 PM     HEAVY RAIN       1 SE LAMBS GROVE        41.69N 93.07W
09/01/2018  M4.25 INCH       JASPER             IA   TRAINED SPOTTER

            SINCE 7PM.

&&

BSS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1153 PM CDT SAT SEP 1 2018

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

1147 PM     FLASH FLOOD      2 SE GRANGER            41.75N 93.80W
09/01/2018                   POLK               IA   DEPT OF HIGHWAYS

            THE IOWA DOT REPORTS THAT HIGHWAY 141
            BETWEEN GRIMES AND GRANGER WAS ESSENTIALLY A
            SHEET OF WATER WITH SPEEDS OF ONLY 10 MPH
            POSSIBLE.

&&

BSS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1159 PM CDT SAT SEP 1 2018

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

1158 PM     HEAVY RAIN       1 N MONTEZUMA           41.60N 92.53W
09/01/2018  M6.48 INCH       POWESHIEK          IA   TRAINED SPOTTER

            RAINFALL REPORTED WAS FOR A 24 HOUR PERIOD.

&&

FAB

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DES MOINES IA
1223 AM CDT SUN SEP 2 2018

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

0705 PM     HAIL             GRIMES                  41.69N 93.79W
09/01/2018  E1.00 INCH       POLK               IA   PUBLIC

            VIA SOCIAL MEDIA.

0710 PM     HAIL             2 ENE URBANDALE         41.65N 93.71W
09/01/2018  E2.00 INCH       POLK               IA   TRAINED SPOTTER

0711 PM     HAIL             1 WNW JOHNSTON          41.69N 93.72W
09/01/2018  E1.00 INCH       POLK               IA   TRAINED SPOTTER

0720 PM     HAIL             2 SSE SAYLORVILLE       41.66N 93.61W
09/01/2018  E1.50 INCH       POLK               IA   TRAINED SPOTTER

            REPORTED AT SAYDEL HIGH SCHOOL.

0730 PM     HAIL             2 N URBANDALE           41.66N 93.74W
09/01/2018  E1.25 INCH       POLK               IA   PUBLIC

0738 PM     HAIL             3 WSW ALTOONA           41.64N 93.53W
09/01/2018  E1.00 INCH       POLK               IA   PUBLIC

0740 PM     HAIL             3 W ALTOONA             41.64N 93.54W
09/01/2018  E1.75 INCH       POLK               IA   FIRE DEPT/RESCUE

            REPORTED AT DELAWARE TOWNSHIP FD.

0742 PM     HAIL             4 SE SAYLORVILLE        41.64N 93.56W
09/01/2018  E2.00 INCH       POLK               IA   BROADCAST MEDIA

            REPORTED IN NORWOODVILLE NEIGHBORHOOD IN DES
            MOINES. VIA WHO TV. TIME ESTIMATED.

0747 PM     HAIL             BONDURANT               41.69N 93.46W
09/01/2018  E1.75 INCH       POLK               IA   PUBLIC

            VIA SOCIAL MEDIA.

0748 PM     HAIL             1 NNW BONDURANT         41.70N 93.47W
09/01/2018  E1.75 INCH       POLK               IA   PUBLIC

            VIA MPING. TIME ESTIMATED.

0748 PM     HAIL             DALLAS CENTER           41.68N 93.96W
09/01/2018  E0.88 INCH       DALLAS             IA   FIRE DEPT/RESCUE

0827 PM     HEAVY RAIN       COLFAX                  41.68N 93.23W
09/01/2018  E3.50 INCH       JASPER             IA   TRAINED SPOTTER

0841 PM     FLASH FLOOD      2 S GRANGER             41.74N 93.82W
09/01/2018                   DALLAS             IA   FIRE DEPT/RESCUE

            MOTORIST RESCUE ALONG XAVIER AVE. WATER UP
            TO HOOD OF VEHICLE.

0947 PM     FLASH FLOOD      9 S TAMA                41.84N 92.55W
09/01/2018                   POWESHIEK          IA   911 CALL CENTER

            GRAVEL ROAD WASHED OUT ALONG 120TH ST
            BETWEEN 310TH AND 320TH.

1043 PM     FLASH FLOOD      1 NNE GRANGER           41.78N 93.81W
09/01/2018                   POLK               IA   PUBLIC

            SOCIAL MEDIA REPORT STATES THAT HIGHWAY 17
            NORTHBOUND IS UNDERWATER AND CLOSED
            APPROXIMATELY 1 MILE NORTH OF GRANGER.

1055 PM     HEAVY RAIN       1 SE LAMBS GROVE        41.69N 93.07W
09/01/2018  M4.25 INCH       JASPER             IA   TRAINED SPOTTER

            SINCE 7PM.

1101 PM     HAIL             2 S AMES                41.99N 93.62W
09/01/2018  E0.88 INCH       STORY              IA   PUBLIC

            VIA SOCIAL MEDIA.

1147 PM     FLASH FLOOD      2 SE GRANGER            41.75N 93.80W
09/01/2018                   POLK               IA   DEPT OF HIGHWAYS

            THE IOWA DOT REPORTS THAT HIGHWAY 141
            BETWEEN GRIMES AND GRANGER WAS ESSENTIALLY A
            SHEET OF WATER WITH SPEEDS OF ONLY 10 MPH
            POSSIBLE.

1158 PM     HEAVY RAIN       1 N MONTEZUMA           41.60N 92.53W
09/01/2018  M6.48 INCH       POWESHIEK          IA   TRAINED SPOTTER

            RAINFALL REPORTED WAS FOR A 24 HOUR PERIOD.

&&