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Hurricane Hanna, September 6, 2008


Event Overview –

Hurricane Hanna was the deadliest storm of the 2008 Atlantic hurricane season. The storm was the eighth tropical cyclone and fourth hurricane of the 2008 Atlantic hurricane season. It formed east-northeast of the northern Leeward Islands on August 28. The cyclone struck Myrtle Beach, South Carolina, before moving up the Eastern Seaboard to become an extratropical cyclone as it moved by New England into the Canadian Maritimes early on September 7 (Figure 1). At least 537 deaths were reported (the final death toll will likely never be known), mostly due to flooding in the northern part of Haiti, making it the deadliest tropical cyclone in the Atlantic basin in 2008. Hanna also caused $160 million in damages to the United States.

Figure 1. Track of Hurricane Hanna, August 28 through September 7, 2008

Figure 2. Hurricane Hanna off the Georgia coast, then later as a Tropical Storm off the Virginia Coast (photo courtesy NASA).

 

 


Evolution and Impacts –

On August 28, while to the east-northeast of the northern Leeward Islands, a tropical low formed into Tropical Depression Eight. Later that day, it attained tropical storm status, and was named Hanna. At the time, the low-level center of circulation was partially exposed on the western edge of the convection, indicating westerly wind shear. Tracking westward primarily under the steering current of a large ridge to the north, the convective pattern began to redevelop late on August 28. On September 1, as Hanna drifted to the south-southwest, convection increased and the storm began to intensify. Later that day around 1:30 pm EDT, an Air Force Reconnaissance Aircraft found winds within Hanna supportive of hurricane strength, and the National Hurricane Center upgraded Hanna to a hurricane. Early on September 2, strong wind shear in association with Hurricane Gustav began to affect Hanna and the storm was downgraded to a tropical storm on September 3. Early on September 6, 2008, Hanna made landfall near the South Carolina-North Carolina border. The system became an extratropical cyclone as it moved into Canada early on September 7 and raced across the North Atlantic.

In Eastern North Carolina, storm surge was estimated at 2 to 3 feet with minor beach erosion in Onslow and Carteret counties and along the Outer Banks. A surge of 4.5 feet along the Pamlico River at Washington resulted in some flooding of low lying areas in Washington and Belhaven. Storm surge estimated at 2 to 4 feet occurred along the Neuse River in Craven County.

The inland counties of Pitt, Jones, Washington, Craven, Duplin and Beaufort all reported minor wind damage with trees and power lines down, some shingles blown off homes, and $10,000 worth of damage was reported to two accessory buildings in Washington County. There were sporadic power outages throughout eastern North Carolina.

Heavy rainfall (Figure 3) during the morning of September 6 across the southwestern portion of Hyde County produced flooding in the Sladesville area resulting in Sladesville Credle Road becoming impassible.

While no deaths or injuries were reported in North Carolina, 7 deaths were reported along the east coast of the United States, mainly rip current related drownings, due to Hanna.

 Figure 3. Rainfall totals along the track of Hanna (September 4-7, 2008).

 

POST TROPICAL CYCLONE REPORT...HURRICANE HANNA

NATIONAL WEATHER SERVICE NEWPORT/MOREHEAD CITY NC

410 PM EDT THU SEP 11 2008

 

 

NOTE: THE DATA SHOWN HERE ARE PRELIMINARY....AND SUBJECT TO UPDATES

AND CORRECTIONS AS APPROPRIATE.

 

THIS REPORT INCLUDES EVENTS OCCURRING WHEN WATCHES AND/OR WARNINGS

WERE IN EFFECT FOR HANNA.

 

COUNTIES INCLUDED...CARTERET...ONSLOW...DARE...CRAVEN...DUPLIN...

JONES...MARTIN...GREENE...LENOIR...PAMLICO...HYDE...BEAUFORT...

PITT...WASHINGTON...TYRRELL

 

 

 

 

 

 

A. LOWEST SEA LEVEL PRESSURE/MAXIMUM SUSTAINED WINDS AND PEAK GUSTS

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METAR OBSERVATIONS...

NOTE: ANEMOMETER HEIGHT IS 10 METERS AND WIND AVERAGING IS 2 MINUTES

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LOCATION  ID    MIN    DATE/     MAX      DATE/     PEAK    DATE/

LAT  LON        PRES   TIME      SUST     TIME      GUST    TIME

DEG DECIMAL     (MB)   (UTC)     (KT)     (UTC)     (KT)    (UTC)

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KMRH-BEAUFORT AIRPORT NC                                           

34.72 76.65     998.9 06/1027   220/036  06/1406   220/048 06/1348 

 

KEWN-NEW BERN NC                                                   

35.09 77.05     995.5 06/1111   180/031  06/1122   180/049 06/1118 

 

KHSE-FRISCO AIRPORT NC                                             

35.22 75.62    1001.9 06/1204   170/037  06/1144   160/047 06/1056 

 

KPGV-GREENEVILLE AIRPORT NC                                        

35.63 77.40                   I 130/018  06/1043 I 130/027 06/1043 I

 

KOAJ- JACKSONVILLE AIRPORT NC                                       

34.83 77.62     993.5 06/1043   170/037  06/1002                   I

 

REMARKS:

 

NON-METAR OBSERVATIONS...

NOTE: ANEMOMETER HEIGHT IN METERS AND WIND AVERAGING PERIOD IN

MINUTES INDICATED UNDER MAXIMUM SUSTAINED WIND IF KNOWN

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LOCATION  ID    MIN    DATE/     MAX      DATE/     PEAK    DATE/

LAT  LON        PRES   TIME      SUST     TIME      GUST    TIME

DEG DECIMAL     (MB)   (UTC)     (KT)     (UTC)     (KT)    (UTC)

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B. MARINE OBSERVATIONS...

NOTE: ANEMOMETER HEIGHT IN METERS AND WIND AVERAGING PERIOD IN

MINUTES INDICATED UNDER MAXIMUM SUSTAINED WIND IF KNOWN

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LOCATION  ID    MIN    DATE/     MAX      DATE/     PEAK    DATE/

LAT  LON        PRES   TIME      SUST     TIME      GUST    TIME

DEG DECIMAL     (MB)   (UTC)     (KT)     (UTC)     (KT)    (UTC)

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41035 - ONSLOW BAY, NC                                             

34.47   77.28   996.8 06/0920   140/035  06/0720   190/056 06/1020 

                                  

 

41036 - ONSLOW BAY , NC                                             

34.21   76.95   999.5 06/0850   140/037  06/0750   140/047 06/0750 

                                  

 

CLKN7 - CAPE LOOKOUT , NC                                          

34.62   76.53  1002.0 06/0900   MMM/039  06/0900   MMM/046 06/1250 

                                  

 

41025 - DIAMOND SHOALS , NC                                        

35.00   75.40  1004.8 06/1050   150/035  06/1050   190/049 06/1250 

                                  

 

DUCN7 - DUCK PIER , NC                                             

36.18   75.75  1001.6 06/1212   140/038                            

                                  

 

REMARKS:

 

 

 

C. STORM TOTAL RAINFALL FROM 1200 UTC SEP 05 UNTIL 1800 UTC SEP 07

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CITY/TOWN                    COUNTY               ID         RAINFALL

LAT LON                                                       (IN)  

DEG DECIMAL

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BEAUFORT                     CARTERET            MRH           1.08 

34.72  -76.65

 

FRISCO                       OUTER BANKS DARE    HSE           1.04 

35.23  -75.61

 

CHERRY POINT MCAS            CRAVEN              NKT           1.30 

34.92  -76.88

 

JACKSONVILLE                 ONSLOW              OAJ           1.32 

34.76  -77.40

 

NEW BERN                     CRAVEN              EWN           0.81 

35.11  -77.08

 

NEWPORT                      CARTERET            MHX           1.11 

34.78  -76.86

 

KINSTON                      LENOIR              KNNN7         1.60 

35.27  -77.59

 

WILLIAMSTON                  MARTIN              WLLN7         2.00 

35.85  -77.06

 

REMARKS:

 

 

D. INLAND FLOODING...

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HYDE...HEAVY RAINFALL DURING THE MORNING OF SEPTEMBER 6TH ACROSS THE

SOUTHWEST PART OF HYDE COUNTY PRODUCED FLOODING IN THE SLADESVILLE

AREA RESULTING IN THE SLADESVILLE CREDLE ROAD BECOMING IMPASSABLE.  

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E. MAXIMUM STORM SURGE AND STORM TIDE...

OFFICIAL TIDE GAUGES NOTED WITH LEADING G

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COUNTY           CITY/TOWN        SURGE   TIDE   DATE/   BEACH      

                 OR LOCATION      (FT)    (FT)   TIME    EROSION    

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CARTERET       G BEAUFORT          2.00   3.20  06/0800    MINOR  

 

DARE           G OREGON INLET      2.40   3.40  06/1900    MINOR  

 

BEAUFORT         WASHINGTON        4.50   4.50  06/1200  UNKNOWN  

 

 

REMARKS:

 

 

F. TORNADOES...

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(DIST)CITY/TOWN              COUNTY           DATE/         EF SCALE

LAT LON (DEG DECIMAL                          TIME(UTC)    (IF KNOWN)

DESCRIPTION                                                         

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G. STORM IMPACTS BY COUNTY...

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COUNTY            DEATHS           INJURIES             EVACUATIONS 

DESCRIPTION

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CARTERET                                                         

 

STORM ESTIMATED AT 2 TO 3 FEET WITH MINOR BEACH EROSION. MINIMAL

DAMAGE ESTIMATED WITH SPORADIC POWER OUTAGES. SOME TREES AND POWER

LINES DOWN.

 

ONSLOW                                                            

 

STORM SURGE ESTIMATED AT 2 TO 3 FEET WITH MINOR BEACH EROSION.

SPORADIC POWER OUTAGES WITH A FEW TREES AND POWER LINES DOWN.

DAMAGES ESTIMATED AT $20,000.

 

DUPLIN                                                           

 

A FEW TREES WERE DOWN ACROSS THE COUNTY.

 

HYDE                                                             

 

SPORADIC POWER OUTAGES REPORTED ACROSS THE COUNTY. STORM SURGE WAS

ESTIMATED AT 1 TO 2 FEET WITH MINOR BEACH EROSION.

 

DARE                                                              

 

SOUND SIDE SURGE OF 2 FEET RESULTED IN OVERWASH OF HIGHWAY 12 NEAR

RODANTHE. DAMAGES WERE MINIMAL.

 

BEAUFORT                                                         

 

STORM SURGE OF 4.5 FEET ALONG THE PAMLICO RIVER AT WASHINGTON

RESULTED IN SOME FLOODING OF LOW LYING AREAS IN WASHINGTON AND

BELHAVEN. SPORADIC POWER OUTAGES WERE REPORTED WITH SOME TREES AND

POWERLINES DOWN. DAMAGES WERE MINIMAL.

 

WASHINGTON                                                       

 

MINOR DAMAGE TO TWO ACCESSORY BUILDINGS WITH DAMAGES ESTIMATED AT

$10,000. A FEW TREES AND POWERLINES WERE DOWN WITH SPORADIC POWER

OUTAGES.

 

JONES                                                            

 

A FEW TREES AND POWERLINES DOWN WITH SPORADIC POWER OUTAGES AND

SHINGLES BLOWN OFF SOME HOMES. DAMAGES WERE MINMAL.

 

PITT                                                             

 

A FEW TREES AND POWERLINES DOWN WITH SPORADIC POWER OUTAGES. ONE

TREE FELL ON A PICKUP TRUCK WITH DAMAGES ESTIMATED AT $5,000.

 

CRAVEN                                                           

 

STORM SURGE ESTIMATED AT 2 TO 4 FEET ALONG THE NEUSE RIVER. A FEW

TREES AND POWERLINES WERE DOWN WITH SPORADIC POWER OUTAGES.

 

$$

 

Sources –

National Hurricane Center

NASA

Wikipedia

 

 

Damage Pictures from Eastern North Carolina
Photos courtesy of: The Associated Press

Click to Enlarge

 


Case Study Team:
Chris Collins