Alert archive / Nebraska / River Flood Warnings in 2011

River Flood Warning 22, NWS Omaha, NE

May 20, 2011Saunders County, Nebraska

NWS Omaha, NE issued this river flood warning at May 20, 2011, 4:11 PM CDT for Saunders County, Nebraska. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: May 20, 2011, 4:11 PM CDT (21:11 UTC)
Expired: May 20, 2011, 10:24 PM CDT
In force: 6 hr
Issued by: NWS Omaha, NE
Flood severity: Major

County Saunders County, NE

The radar

The Omaha radar (KOAX), 25 km from the middle of the area, began a volume at 21:14 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 Wahoo Creek at Ashland (ASNN1).

Action stage: 17 ft
Minor stage: 19 ft
Moderate stage: 20 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 06804700, 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 Omaha, NE wrote its last area forecast discussion before this river flood warning went out at May 20, 3:47 PM CDT, 24 minutes earlier.

Area forecast discussion, May 20, 3:47 PM CDT, 24 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
347 PM CDT FRI MAY 20 2011

.SHORT TERM...TONIGHT THROUGH SUNDAY NIGHT.

SURFACE HEATING CONTRIBUTING TO THUNDERSTORM DEVELOPMENT CNTRL
KS/CNTRL NEB WITHIN AXIS OF DESTABILIZATION AND DEEP LYR MOISTURE
CONVG. NARROW LINE OF ACTIVITY WAS MOVING NNE AND SHOULD BE OVER
CWA WRN PERIPHERY NEXT COUPLE HOURS. OVERALL FCST IN GOOD SHAPE.
EXPECT THUNDER ACTIVITY TO SPREAD EWD THRU THE CWA THIS EVENING.
HAVE BACKED OFF POPS AFTER MIDNIGHT TONIGHT GIVEN DRY SLOT WEDGE
COMING UP FROM THE SOUTH.

IMPULSES ROTATING AROUND UPPER CLOSED LOW SITUATED OVER THE
NRN/CNTRL PLAINS WILL CONTRIBUTE TO DESTABILIZATION SATURDAY AFTN
WITH MAIN INSTABILITY AXIS SETTING UP FROM THE CWA SWD THRU ERN
KS/WRN MO AHEAD OF AN APPROACHING COLD FRONT. DID NOTE THAT NAM A BIT
MORE ROBUST THAN GFS WITH MOISTURE ADVECTION INTO THE REGION. AS OF
NOW THINK THERE IS A DECENT CHANCE FOR SVR STORM DEVELOPMENT OVER
THE SRN CWA WHERE NRN EDGE OF BEST DEEP LYR SHEAR/MUCAPES PHASE.
COLD FRONT SHOULD CLEAR THE CWA QUICKLY SAT NIGHT...BUT LEAVE
SMALL TOKEN POPS IN PLACE ERN AREAS IN CASE OF LINGERING ACTIVITY.
ANOTHER COLDER AIRMASS SWEEPING IN SUNDAY NIGHT ASSOCIATED WITH
VORT MAX CROSSING THE DAKOTAS INTO THE UPPER MIDWEST...AND SEEMS
REASONABLE TO ADD SMALL POPS.

.LONG TERM...MONDAY THROUGH FRIDAY.

MODELS CONTINUE TO ADVERTISE SOMEWHAT COMPLICATED LARGE SCALE FLOW
REGIME IN THE EXTENDED PDS WITH 3 NEARLY STATIONARY UPPER LEVEL LOWS
SITUATED OVER...GULF OF AK/WRN CONUS/HUDSON BAY. HOWEVER FEATURE OF
CONCERN FOR US IS SHORT WAVE TROF EJECTING FROM THE WRN STATES AND
CROSSING THE CNTRL PLAINS. GFS/ECM SFC FEATURES IN POOR AGREEMENT
WITH RESPECT TO ATTENDANT SFC LOW...BUT APPEARS THOUGH HPC
GENERALLY PREFERRING ECM SOLUTION.  POST-FRONTAL POPS TUESDAY THRU
WED NIGHT WILL BE FOCUSED OVER THE SRN CWA. MOIST BNDRY LYR
CONVG ZONE IS PROGGED TO EXTEND ACROSS KS/MO...BUT STOUT 305K
UPGLIDE/MOIST ADV SHOULD BE ENOUGH TO PRODUCE SCATTERED PCPN WITHIN
AXIS OF LOW CONDENSATION PRES DEFICITS. LIFT ENHANCED AS WELL WITH
PASSING IMPULSES/INCREASING DPVA ASSOCIATED WITH APPROACHING UPPER
TROF. DRY THEN THURSDAY AS LOW AMPLITUDE/SFC HIGH BUILD IN BEHIND
EXITING COLD FRONT. HAVE DECIDED TO INCLUDE THUNDER CHANCES
THURSDAY NIGHT/FRI WHEN COMBINATION OF STOUT UPPER DIVERGENCE/VORT
LOBE MOVES ACROSS THE NRN PLAINS. BNDRY LYR-250MB DIFFERENTIAL
DIVERGENCE IS QUITE STRONG....AND ECM QPF VALUES FROM DAKOTAS INTO
ERN NEB/WRN IA REFLECTING THIS. OTHERWISE STILL EXPECTING BELOW
NORM TEMPS THE END OF NEXT WEEK.

DEE

&&

.AVIATION...
TAF SITES KOFK/KOMA/KLNK

18Z TAFS

GENERALLY LOOKING AT A MIX OF MVFR AND IFR CONDITIONS AT ALL THREE
TAF SITES UNTIL AROUND 10Z TO 12Z.  MORE GENERAL RAIN SHOWERS WILL
GIVE WAY TO THREAT OF THUNDERSTORM DEVELOPMENT BETWEEN 21Z AND 00Z
AS THUNDERSTORMS ONCE AGAIN DEVELOP ACROSS PARTS OF CENTRAL KANSAS
AND SOUTH CENTRAL NEBRASKA AND THEN MOVE NORTH NORTHEAST.  EXPECT
IFR CONDITIONS IN VICINITY OF ALL THUNDERSTORMS THAT DEVELOP ALONG
WITH A THREAT OF LARGE HAIL.  AFTER 12Z EXPECT CONDITIONS TO
IMPROVE...AT LEAST TREND TOWARD...VFR THOUGH SOME VICINITY SHOWER
ACTIVITY MAY REDEVELOP SATURDAY AFTERNOON.

MEYER

&&

.OAX WATCHES/WARNINGS/ADVISORIES...

NE...NONE.
IA...NONE.

&&

Hazardous weather outlook, May 20, 11:34 AM CDT, 4 hours 37 minutes before

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In the hours before

Local storm report, May 20, 10:27 AM CDT, 5 hours 44 minutes before

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Local storm report, May 20, 10:28 AM CDT, 5 hours 43 minutes before

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Local storm report, May 20, 10:30 AM CDT, 5 hours 41 minutes before

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Local storm report, May 20, 10:31 AM CDT, 5 hours 40 minutes before

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Local storm report, May 20, 10:32 AM CDT, 5 hours 39 minutes before

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Local storm report, May 20, 10:52 AM CDT, 5 hours 19 minutes before

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The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 19, 7:41 PM CDT	Severe Thunderstorm Warning	OAX	Seward	34 min
May 19, 10:32 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson, Saline	28 min
May 19, 10:59 PM CDT	Severe Thunderstorm Warning	OAX	Saline	31 min
May 20, 10:03 AM CDT	Areal Flood Advisory	OAX	Seward	6 hr
May 20, 10:16 AM CDT	River Flood Warning	OAX	Cass	130 days
May 20, 10:34 AM CDT	River Flood Warning	OAX	Saunders	15 hr
May 20, 10:42 AM CDT	River Flood Warning	OAX	Saline	3 days
May 20, 10:42 AM CDT	River Flood Warning	OAX	Saline	3 hr
May 20, 11:04 AM CDT	Areal Flood Warning	OAX	Saunders	6 hr
May 20, 11:58 AM CDT	River Flood Advisory	OAX	Jefferson	3 hr
May 20, 3:05 PM CDT	River Flood Warning	OAX	Jefferson	12 hr
May 20, 5:01 PM CDT	Areal Flood Warning	OAX	Saunders	4 hr

Nearby

River Flood Warnings in Nebraska, 2011 Every river flood warning in 2011

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.