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Mississippi and Atchafalaya River Flood Briefing May 9, 2011. National Weather Service Lower Mississippi River Forecast Center and Weather Forecast Office New Orleans/Baton Rouge and Jackson, MS. Rainfall Next 5 Days.

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Mississippi and atchafalaya river flood briefing may 9 2011

Mississippi and Atchafalaya River Flood BriefingMay 9, 2011

National Weather Service

Lower Mississippi River Forecast Center

and

Weather Forecast OfficeNew Orleans/Baton Rouge and Jackson, MS


Rainfall next 5 days
Rainfall Next 5 Days

Pattern Brings Light to ModerateRainto Ohio and Mississippi River Basins


May 11

May 12

May 13

Extended Forecast

May 14

May 15


Mississippi River Crests

With and Without Morganza Operation

* Levee Heights provided by U.S. Army Corps of Engineers


Atchafalaya River Crests

With and Without Morganza Operation

* Levee Heights provided by U.S. Army Corps of Engineers


Mississippi river forecast
Mississippi River Forecast

Assumes NO Morganza Operation

Crest Height at 57.5’

May 19th

Crest Height at 64.0’

May 21st

Crest Height at 65.5’

May 22nd

Crest Height at 47.5’

May 22nd

Crest Height at 36.0’

May 22nd

Crest Height at 28.0’

May 23rd

Crest Height at 19.5’

May 23rd


Mississippi river forecast1
Mississippi River Forecast

Assumes Morganza Operation

Crest Height at 57’

May 20th

Crest Height at 62.5’

May 22rd

Crest Height at 63.5’

to 64.5’ May 23rd

Crest Height at 45.5’

to 46.5’ May 23rd

Crest Height at 35.0’

May 23rd

Crest Height at 25.0’

May 24th

Crest Height at 17.0’

May 24th


Atchafalaya river basin
Atchafalaya River Basin

Assumes No Morganza Operation

Crest Height at 50.0’

May 23rd

Crest Height at 40.0’

May 23rd

Crest Height at 35.0’

May 24th

Crest Height at 25.0’

May 24th

Crest Height at 14.0’

May 25th

Crest Height at 14.5’

May 25th

Crest Height at 9.5’

May 25th


Atchafalaya river basin1
Atchafalaya River Basin

Assumes Morganza Operation

Crest Height at 50.0’

May 23rd

Crest Height at 40.0’

May 23rd

Crest Height at 35.0’

May 24th

Crest Height at 27.0’

May 24th

Crest Height at 21.5’

May 25th

Crest Height at 19.0’

May 25th

Crest Height at 12-13’

May 25th


Morgan city impacts forecast crest no morganza 9 5 ft forecast crest morganza 12 to 13 ft

DATE CREST

05/28/1973 10.53 RECORD

06/27/1957 8.46

04/05/1997 8.06

04/18/1975 7.95

06/06/1983 7.32

MORGAN CITY IMPACTSFORECAST CREST (NO Morganza)– 9.5 FTFORECAST CREST (Morganza) – 12 to 13 FT


Morgan city forecast crest 9 5 ft

4 ft – Water will move up the bank and across access roads below the city dock. Vessel Traffic safety rules will be strictly enforced by the US Coast Guard. Minor

5 ft – Floodwall gates will be closed to protect against higher stages. Vessel traffic will be affected by stronger river current and vessel traffic safety rules will be strictly enforced by the U. S. Coast guard. Minor

6 ft – The city dock will be under water. Water will cover the lower end of Belleview Front street in Berwick. Vessel traffic will be affected by stronger river current and vessel traffic safety rules will be strictly enforced by the U. S. Coast guard. Minor

7 ft – Buildings at the foot of Ann street on the river side of the flood wall will flood as water overtops the Rio Oil Company dock. Buildings on the river side of the Berwick floodwall will flood. River traffic restrictions will be strictly enforced. Moderate

9 ft – structures on the river side of protection walls in Morgan City and Berwick will be under water. River traffic restrictions will be strictly enforced. Moderate

MORGAN CITYFORECAST CREST – 9.5 FT


Morgan city forecast crest 12 13 ft

THERE IS A MAJOR FLOOD THREAT.

BACK WATER FLOODING OF 5 TO 6 FEET AT BAYOU BOUEF WILL CAUSE DAMAGE EAST OF MORGAN CITY TO THE COMMUNITY OF AMELIA.

STRUCTURES ON THE RIVER SIDE OF PROTECTION WALLS IN MORGAN CITY AND BERWICK WILL BE UNDER WATER. RIVER TRAFFIC RESTRICTIONS WILL BE STRICTLY ENFORCED.

MORGAN CITYFORECAST CREST – 12 - 13 FT


Records on Mississippi River

Red River Landing

Baton Rouge

47.28 ft on 05/15/1927

45.18 ft on 05/16/1922

45.18 ft on 04/29/1945

Current forecast crest 47.5 ft

  • 62.30 ft on 03/25/1997

  • 60.94 ft on 05/14/1927

  • 60.96 ft on 04/25/2008

    Current forecast crest 65.5 ft

Donaldsonville

Reserve

36.01 ft on 05/15/1927

34.75 ft on 05/16/1922

34.11 ft on 04/29/1945

Current forecast crest 36.0 ft

26.00 ft on 06/11/1929

25.90 ft on 04/28/1945

25.60 ft on 03/05/1932

Current forecast crest 28.0 ft

New Orleans

21.27 ft on 04/25/1922

21.02 ft on 05/11/1912

21.00 ft on 04/25/1927

Current forecast crest 19.5 ft


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