Post by SKYSUMMIT on Sept 11, 2012 14:09:26 GMT -6
PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE, LA 240 PM CDT TUE SEP 11 2012
...NWS RIVER FLOOD SURVEYS FOR HURRICANE ISAAC - WOLF RIVER...
.OVERVIEW... VERY HEAVY RAINFALL FROM SLOW-MOVING HURRICANE ISAAC CAUSED SUBSTANTIAL FLOODING IMPACTS ACROSS THE MISSISSIPPI AND LOUISIANA GULF COAST REGION. THE NATIONAL WEATHER SERVICE CREATED TEAMS TO SURVEY THE FLOOD DAMAGE AND ESTIMATE FLOOD SEVERITY IN THE IMPACTED AREAS. HYDROLOGISTS FROM THE LOWER MISSISSIPPI RIVER FORECAST CENTER, WFO NEW ORLEANS/BATON ROUGE, WFO JACKSON, AND WFO BIRMINGHAM CONTRIBUTED TO THESE SURVEYS.
A BAND OF HEAVY RAINFALL FOLLOWED THE ENTIRE WOLF RIVER WATERSHED FROM THE GULF COAST TO NEAR POPLARVILLE, MS. ESTIMATED RAINFALL AMOUNTS OF 15 TO 20 INCHES WERE WIDESPREAD ACROSS THE WATERSHED. AT THE SAME TIME, A SWATH OF RAINFALL TOTALS MEASURING GREATER THAN 20 INCHES FOLLOWED THE GENERAL COURSE OF THE RIVER. FLOOD DAMAGE CONSISTENT WITH FLOODING OF MAJOR SEVERITY WAS SURVEYED ALONG THE WOLF RIVER.
.WOLF RIVER AT MS26 EAST OF POPLARVILLE FLOOD CATEGORY: MAJOR FLOODING, *NEW RECORD STAGE* RIVER GAUGE: USGS CREST ONLY PERIOD OF RECORD: 1952-1971, 1998-PRESENT CREST: 34.5 FT SOMETIME BEFORE 12:05 PM CDT 08/30/2012 SUMMARY: WIDESPREAD BENT AND SNAPPED TREES/BRUSH IN THE FLOODPLAIN. WATER APPEARED TO HAVE KNOCKED OVER FENCING AND A LARGE METAL GATE.
.WOLF RIVER AT SILVER RUN RD EAST OF POPLARVILLE FLOOD CATEGORY: MAJOR FLOODING RIVER GAUGE: N/A CREST: POSSIBLY HIGHEST SINCE AT LEAST 1934 SUMMARY: WIDESPREAD BENT AND SNAPPED TREES/BRUSH IN THE FLOODPLAIN, UP TO ELEVATION ABOUT 1 FT HIGHER THAN DECK OF BRIDGE. EVIDENCE OF SCOURING AT BRIDGE APPROACH GUARDRAILS. ANECDOTAL EVIDENCE FROM INDIVIDUAL RESIDING IN THE AREA SUGGESTS THAT FLOOD ELEVATION MAY HAVE BEEN HIGHER THAN ANY PREVIOUS FLOOD SINCE 1934.
.WOLF RIVER AT MCNEILL-MCHENRY RD NEAR SILVER RUN FLOOD CATEGORY: MAJOR FLOODING RIVER GAUGE: N/A CREST: N/A SUMMARY: WIDESPREAD BENT AND SNAPPED TREES/BRUSH IN THE FLOODPLAIN, UP TO ELEVATION ABOUT 1 FT HIGHER THAN APPROACHES TO BRIDGE. BRIDGE WAS ARCH DESIGN THAT DID NOT OVERTOP. LARGE BRANCHES AND OTHER TREE DEBRIS WAS NOTED ON TOP OF BRIDGE SUPPORT PILINGS. FLOODING WAS ALSO SURVEYED ALONG GO GO RD JUST UPSTREAM OF SILVER RUN. WATER ELEVATION IN SMALL DEVELOPED AREA ALONG THE RIVER APPEARED TO REACH 8 T0 10 FT ABOVE GROUND LEVEL IN PLACES. SOME LARGE FLOOD DEBRIS APPEARED TO HAVE BEEN MOVED ABOUT 100 YDS UNTIL CAUGHT BY THICK TREES/BRUSH.
.CRANE CREEK AT CRANE CREEK RD NORTHEAST OF NECAISE FLOOD CATEGORY: MAJOR FLASH FLOODING RIVER GAUGE: N/A CREST: N/A WIDESPREAD BENT TREES/BRUSH IN THE FLOODPLAIN AND MUD MARKS SUGGESTED FLASH FLOODING REACHING ELEVATIONS OF 1 TO 3 FT OVER BRIDGE DECK.
.WOLF RIVER AT US53 NORTHWEST OF LYMAN FLOOD CATEGORY: MODERATE FLOODING RIVER GAUGE: N/A CREST: N/A WIDESPREAD BENT TREES/BRUSH IN THE FLOODPLAIN SUGGESTED FLOODING COVERING THE FLOODPLAIN REACHING ELEVATION 1 TO 3 FT OVER BRIDGE DECK.
.WOLF RIVER AT CABLE BRIDGE RD WEST OF LYMAN FLOOD CATEGORY: MAJOR FLOODING, *NEW RECORD STAGE* RIVER GAUGE: USGS AUTOMATED GAUGE PERIOD OF RECORD: 1971-PRESENT CREST: 31.4 FT ABOUT 3:00PM CDT 08/31/2012 SUMMARY: WIDESPREAD BENT AND SNAPPED TREES/BRUSH IN THE FLOODPLAIN. WATER APPEARED TO HAVE REACHED ELEVATION WITHIN 1 TO 3 FT OF BRIDGE DECK. FLOODING WAS ALSO SURVEYED NEAR I-10 JUST DOWNSTREAM. INFORMATION FROM HARRISON COUNTY EM OFFICE AND EVIDENCE FROM SURVEY SUGGESTS WATER REACHED ELEVATION OF SHOULDER OF BRIDGE APPROACHES, BUT DID NOT REACH ROAD OR BRIDGE DECK.
.WOLF RIVER AT BELLS FERRY RD NORTHWEST OF LONG BEACH FLOOD CATEGORY: MAJOR FLOODING, *NEW RECORD STAGE* RIVER GAUGE: COUNTY STAFF GAUGE PERIOD OF RECORD: 1981-PRESENT CREST: 16.0FT ABOUT 12:00PM CDT 09/01/2012 SUMMARY: WIDESPREAD BENT BRUSH AND TREES WITH MUD MARKS. WATER COVERED BELLS FERRY RD FOR ABOUT 0.8 MI, TO ESTIMATED DEPTH OF 3 TO 4 FT IN MOST PLACES. NUMEROUS PROPERTIES WERE AFFECTED IN THE TUCKER RD AND MAGNOLIA DR AREAS, WITH STRUCTURES RECEIVING WATER DAMAGE. CREST STAGE WAS ESTIMATED BY NWS HYDROLOGISTS BY SURVEYING HIGH WATER MARKS TO THE STAFF GAUGE AND BY ACCUMULATING ANECDOTAL INFORMATION FROM NUMEROUS RESIDENTS IN THE AREA.
NOTE: SOME INFORMATION IN THIS STATEMENT REMAINS PRELIMINARY AND IS SUBJECT TO REVIEW/UPDATE BY THE NATIONAL WEATHER SERVICE AND THE US GEOLOGICAL SURVEY.
PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE, LA 240 PM CDT TUE SEP 11 2012
...NWS RIVER FLOOD SURVEYS FOR HURRICANE ISAAC - WOLF RIVER...
.OVERVIEW... VERY HEAVY RAINFALL FROM SLOW-MOVING HURRICANE ISAAC CAUSED SUBSTANTIAL FLOODING IMPACTS ACROSS THE MISSISSIPPI AND LOUISIANA GULF COAST REGION. THE NATIONAL WEATHER SERVICE CREATED TEAMS TO SURVEY THE FLOOD DAMAGE AND ESTIMATE FLOOD SEVERITY IN THE IMPACTED AREAS. HYDROLOGISTS FROM THE LOWER MISSISSIPPI RIVER FORECAST CENTER, WFO NEW ORLEANS/BATON ROUGE, WFO JACKSON, AND WFO BIRMINGHAM CONTRIBUTED TO THESE SURVEYS.
A BAND OF HEAVY RAINFALL FOLLOWED THE ENTIRE WOLF RIVER WATERSHED FROM THE GULF COAST TO NEAR POPLARVILLE, MS. ESTIMATED RAINFALL AMOUNTS OF 15 TO 20 INCHES WERE WIDESPREAD ACROSS THE WATERSHED. AT THE SAME TIME, A SWATH OF RAINFALL TOTALS MEASURING GREATER THAN 20 INCHES FOLLOWED THE GENERAL COURSE OF THE RIVER. FLOOD DAMAGE CONSISTENT WITH FLOODING OF MAJOR SEVERITY WAS SURVEYED ALONG THE WOLF RIVER.
.WOLF RIVER AT MS26 EAST OF POPLARVILLE FLOOD CATEGORY: MAJOR FLOODING, *NEW RECORD STAGE* RIVER GAUGE: USGS CREST ONLY PERIOD OF RECORD: 1952-1971, 1998-PRESENT CREST: 34.5 FT SOMETIME BEFORE 12:05 PM CDT 08/30/2012 SUMMARY: WIDESPREAD BENT AND SNAPPED TREES/BRUSH IN THE FLOODPLAIN. WATER APPEARED TO HAVE KNOCKED OVER FENCING AND A LARGE METAL GATE.
.WOLF RIVER AT SILVER RUN RD EAST OF POPLARVILLE FLOOD CATEGORY: MAJOR FLOODING RIVER GAUGE: N/A CREST: POSSIBLY HIGHEST SINCE AT LEAST 1934 SUMMARY: WIDESPREAD BENT AND SNAPPED TREES/BRUSH IN THE FLOODPLAIN, UP TO ELEVATION ABOUT 1 FT HIGHER THAN DECK OF BRIDGE. EVIDENCE OF SCOURING AT BRIDGE APPROACH GUARDRAILS. ANECDOTAL EVIDENCE FROM INDIVIDUAL RESIDING IN THE AREA SUGGESTS THAT FLOOD ELEVATION MAY HAVE BEEN HIGHER THAN ANY PREVIOUS FLOOD SINCE 1934.
.WOLF RIVER AT MCNEILL-MCHENRY RD NEAR SILVER RUN FLOOD CATEGORY: MAJOR FLOODING RIVER GAUGE: N/A CREST: N/A SUMMARY: WIDESPREAD BENT AND SNAPPED TREES/BRUSH IN THE FLOODPLAIN, UP TO ELEVATION ABOUT 1 FT HIGHER THAN APPROACHES TO BRIDGE. BRIDGE WAS ARCH DESIGN THAT DID NOT OVERTOP. LARGE BRANCHES AND OTHER TREE DEBRIS WAS NOTED ON TOP OF BRIDGE SUPPORT PILINGS. FLOODING WAS ALSO SURVEYED ALONG GO GO RD JUST UPSTREAM OF SILVER RUN. WATER ELEVATION IN SMALL DEVELOPED AREA ALONG THE RIVER APPEARED TO REACH 8 T0 10 FT ABOVE GROUND LEVEL IN PLACES. SOME LARGE FLOOD DEBRIS APPEARED TO HAVE BEEN MOVED ABOUT 100 YDS UNTIL CAUGHT BY THICK TREES/BRUSH.
.CRANE CREEK AT CRANE CREEK RD NORTHEAST OF NECAISE FLOOD CATEGORY: MAJOR FLASH FLOODING RIVER GAUGE: N/A CREST: N/A WIDESPREAD BENT TREES/BRUSH IN THE FLOODPLAIN AND MUD MARKS SUGGESTED FLASH FLOODING REACHING ELEVATIONS OF 1 TO 3 FT OVER BRIDGE DECK.
.WOLF RIVER AT US53 NORTHWEST OF LYMAN FLOOD CATEGORY: MODERATE FLOODING RIVER GAUGE: N/A CREST: N/A WIDESPREAD BENT TREES/BRUSH IN THE FLOODPLAIN SUGGESTED FLOODING COVERING THE FLOODPLAIN REACHING ELEVATION 1 TO 3 FT OVER BRIDGE DECK.
.WOLF RIVER AT CABLE BRIDGE RD WEST OF LYMAN FLOOD CATEGORY: MAJOR FLOODING, *NEW RECORD STAGE* RIVER GAUGE: USGS AUTOMATED GAUGE PERIOD OF RECORD: 1971-PRESENT CREST: 31.4 FT ABOUT 3:00PM CDT 08/31/2012 SUMMARY: WIDESPREAD BENT AND SNAPPED TREES/BRUSH IN THE FLOODPLAIN. WATER APPEARED TO HAVE REACHED ELEVATION WITHIN 1 TO 3 FT OF BRIDGE DECK. FLOODING WAS ALSO SURVEYED NEAR I-10 JUST DOWNSTREAM. INFORMATION FROM HARRISON COUNTY EM OFFICE AND EVIDENCE FROM SURVEY SUGGESTS WATER REACHED ELEVATION OF SHOULDER OF BRIDGE APPROACHES, BUT DID NOT REACH ROAD OR BRIDGE DECK.
.WOLF RIVER AT BELLS FERRY RD NORTHWEST OF LONG BEACH FLOOD CATEGORY: MAJOR FLOODING, *NEW RECORD STAGE* RIVER GAUGE: COUNTY STAFF GAUGE PERIOD OF RECORD: 1981-PRESENT CREST: 16.0FT ABOUT 12:00PM CDT 09/01/2012 SUMMARY: WIDESPREAD BENT BRUSH AND TREES WITH MUD MARKS. WATER COVERED BELLS FERRY RD FOR ABOUT 0.8 MI, TO ESTIMATED DEPTH OF 3 TO 4 FT IN MOST PLACES. NUMEROUS PROPERTIES WERE AFFECTED IN THE TUCKER RD AND MAGNOLIA DR AREAS, WITH STRUCTURES RECEIVING WATER DAMAGE. CREST STAGE WAS ESTIMATED BY NWS HYDROLOGISTS BY SURVEYING HIGH WATER MARKS TO THE STAFF GAUGE AND BY ACCUMULATING ANECDOTAL INFORMATION FROM NUMEROUS RESIDENTS IN THE AREA.
NOTE: SOME INFORMATION IN THIS STATEMENT REMAINS PRELIMINARY AND IS SUBJECT TO REVIEW/UPDATE BY THE NATIONAL WEATHER SERVICE AND THE US GEOLOGICAL SURVEY.
