Alert archive / Iowa / River Flood Warnings in 2009

River Flood Warning 99, NWS Des Moines, IA

October 29, 2009Mahaska County, Marion County, Iowa

NWS Des Moines, IA issued this river flood warning at Oct 29, 2009, 11:56 PM CDT for Mahaska County, Marion County, Iowa. It was in force for 31 hr.

The area

The counties it named.

The facts

Issued: Oct 29, 2009, 11:56 PM CDT (04:56 UTC)
Expired: Oct 31, 2009, 7:17 AM CDT
In force: 31 hr
Issued by: NWS Des Moines, IA
Flood severity: Minor

Counties Mahaska County, IA, Marion County, IA

The radar

The Des Moines radar (KDMX), 84 km from the middle of the area, began a volume at 04:55 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 Cedar Creek near Bussey (BSSI4).

Action stage: 16 ft
Minor stage: 25 ft
Moderate stage: 30 ft
Major stage: 32 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 05489000, 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 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 river flood warning went out at Oct 29, 8:55 PM CDT, 3 hours 1 minute earlier.

Area forecast discussion, Oct 29, 8:55 PM CDT, 3 hours 1 minute before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
855 PM CDT THU OCT 29 2009

.UPDATE...
DRY SLOT HAS MADE SIGNIFICANT PROGRESS INTO IA THIS EVENING AND HAS
ENDED HEAVY RAIN THREAT OVER ALL BUT N CENTRAL AND E CENTRAL
COUNTIES.  HAVE AMENDED FORECAST TO DRAMATICALLY REDUCE POPS
OVERNIGHT CENTRAL AND WESTERN SECTIONS...AND LOWERED FROM
CATEGORICAL TO SCATTERED WORDING EAST BY 04Z WHEN EXTRAPOLATION
EXITS RAIN SHIELD FROM FORECAST AREA.  MADE SIMILAR CHANGES TO FLASH
FLOOD WATCH...CANCELING WHERE APPROPRIATE AND ENDING BY MIDNIGHT
ELSEWHERE.  THIS MAY STILL BE A TAD TOO LATE...BUT HEADING IN THE
RIGHT DIRECTION.  MAY CANCEL EARLY ONCE RAIN CLEARS AREA.  ALSO MADE
SOME MINOR TEMP/DEWPOINT CHANGES TO KEEP THEM STEADY UNTIL FROPA.

&&

.SHORT TERM...TONIGHT
RAIN AND THUNDERSTORMS CONTINUE TO OUR SW AND MOISTURE CHANNEL
INHIBITED FOR THE NEXT 12 TO 18 HOURS AS 50 TO 60KT H850 FLOW
CONTINUES FROM THE SW. WATER VAPOR IMAGERY SHOWS THE MAIN SYSTEM
JUST ROUNDING THE BEND ACROSS EASTERN OK. SFC LOW APPEARS TO BE
REORGANIZING OVER NORTHEAST OK. HT FALLS FROM 12Z AT H850 THROUGH
H500 SHOWED LITTLE EASTWARD TRANSLATION OF THE UPPER LEVEL
FEATURES...THUS THE MOISTURE CHANNEL WILL REMAIN IN PLACE FOR THE
NEXT 12 HOURS. QPF BEGINNING TO EXPAND AGAIN WITH THE NEXT
WAVE...WITH GOOD FORCING AND HIGH PWATS AND THE LOW FFG OVER THE
SOUTH AND EAST...ANY ADDITIONAL 1 TO 3 INCH RAINFALLS WILL POSE
PROBLEMS. RAIN SHOULD TAPER OFF AFT 06Z TNT AS DRY SLOT ENTERS THE
PICTURE WITH SOME RESIDUAL DRIZZLE BEFORE THE DRY SLOT TAKES OVER
THE AREA AFT 09Z. MINS WILL NOT DROP MUCH WITH STRONG SE
WINDS...RAIN...AND OVERCAST. SOME COOLER TEMPS WILL BE MOVING INTO
THE WEST TOWARD MORNING...THOUGH STILL MILD.

.LONG TERM...FRIDAY THROUGH THURSDAY
PRIMARY PRECIPITATION WILL BE DONE BY 12Z FRIDAY MORNING THROUGH THE
UPPER LEVEL TROUGH WILL STILL BE WEST OF THE AREA. STRONG SFC COLD
ADVECTION WILL BE PASSING THROUGH CNTRL IOWA FRIDAY MORNING AND
ACTUALLY LIFTING EAST/NORTHEAST THROUGH THE REMAINDER OF THE AREA
12-15Z AS COLD AIR WRAPS AROUND THE SYSTEM. THE RESULT WILL BE
FALLING TEMPERATURES IN THE MORNING WITH SOME REBOUND IN THE
AFTERNOON HOWEVER HIGH TEMPERATURES WILL LIKELY BE AROUND 12Z MOST
LOCATIONS. MOISTURE WILL BE QUITE LIMITED MUCH OF THE DAY THROUGH A
FEW SHOWERS WILL BE POSSIBLE OVER THE NORTH LATE FRIDAY INTO FRIDAY
EVENING AS THE WAVE TRANSLATES EAST ACROSS THE STATE.

COOL AND DRY CONDITIONS ARE EXPECTED ON SATURDAY WITH A BREEZY
NORTHWEST WIND. LOW LEVEL WARM ADVECTION COMMENCES SATURDAY NIGHT
AND WILL RESULT IN A WARMER DAY ON SUNDAY. WENT CONSERVATIVE ON
TEMPERATURES FOR SUNDAY AT THIS TIME THOUGH IF SUFFICIENT SUN IS
AVAILABLE...SOUTHWEST WINDS COULD EASILY PUSH HIGHS INTO THE 60S
OVER MUCH OF THE CENTRAL AND SOUTH. A SYSTEM MOVING THROUGH THE
NORTHWEST FLOW WILL AFFECT NORTHERN IOWA LATE IN THE DAY BRINGING AN
INCREASE IN CLOUD COVER AND POSSIBLY SOME LIGHT RAIN INTO THE
EVENING. NO SIGNIFICANT WEATHER NEXT WEEK...MONDAY THROUGH THURSDAY.
POTENTIAL FOR ANOTHER SYSTEM TO CLIP THROUGH TUESDAY AND TUESDAY
EVENING WITH ANOTHER POTENTIAL FOR LIGHT RAIN OTHERWISE DRY WITH
SEASONAL TEMPERATURES.

&&

.AVIATION...30/00Z
WIDESPREAD IFR/LIFR CONDITIONS...MAINLY DUE TO CIGS...COVER MUCH OF
IA EARLY THIS EVENING.  SHOWERS COVERED MUCH OF THE STATE AS WELL
WITH EMBEDDED THUNDER SE NEAR KOTM.  THIS PRECIP SHIELD SHOULD
CONTINUE LIFTING N AND E THIS EVENING WITH SHOWERS AND ISOLATED
STORMS DIMINISHING SW-NE THROUGH 07Z.  CIGS SHOULD REMAIN IFR FOR
SEVERAL HOURS EVEN AFTER PRECIP ENDS...FOLLOWED BY INCREASING WINDS
EARLY FRI MORNING.  CIGS SHOULD LIFT BECOMING MVFR/VFR FOR MUCH OF
FRI TOO.

&&

.DMX WATCHES/WARNINGS/ADVISORIES...FLASH FLOOD WATCH N CENTRAL AND E
CENTRAL SECTIONS TIL MIDNIGHT.

&&

SHORT TERM...REV/SMALL
LONG TERM...DONAVON
AVIATION...SMALL

Hazardous weather outlook, Oct 29, 10:02 PM CDT, 1 hour 54 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 29, 8:48 PM CDT	River Flood Warning	DMX	Cerro Gordo, Floyd, Worth	14 hr
Oct 29, 9:02 PM CDT	River Flood Warning	DMX	Lucas, Wayne	46 hr
Oct 29, 9:02 PM CDT	River Flood Warning	DMX	Appanoose, Wayne	23 hr
Oct 30, 1:32 AM CDT	River Flood Warning	DMX	Wapello	15 hr

Nearby

River Flood Warnings in Iowa, 2009 Every river flood warning in 2009

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.