National Weather Service United States Department of Commerce

Hurricane Isaias - August 3, 2020

 

Isaias tracked north-northeast off the GA and southern SC coasts on August 3, 2020 as a tropical storm before intensifying to a Category 1 hurricane about 50 miles east of Charleston, SC. The storm made its closest approach to our area when it passed by the mouth of the Santee River ~25 miles offshore. The storm mostly spared the GA Coastal Empire from significant impacts but did cause some minor impacts across portions of the SC Lowcountry from tropical storm force wind gusts, flooding rainfall and minor coastal flooding, especially northeast of Charleston. Once again the area was spared more significant coastal flooding as the center of Isaias remained just offshore and the timing of the highest storm surge didn't line up with the timing of the highest astronomical tides.

STORM TOTAL RAINFALL FROM 1200 UTC AUG 02 UNTIL 1200 UTC AUG 04
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CITY/TOWN                    COUNTY               ID         RAINFALL
LAT LON                                                       (IN)
DEG DECIMAL
---------------------------------------------------------------------
7 NE MCCLELLANVILLE CRN      CHARLESTON          SRES1         7.01
33.15  -79.36

1 ESE MCCLELLANVILLE         CHARLESTON          SC-CR-33      4.51
33.08  -79.46

ISLE OF PALMS                CHARLESTON          SC-CR-166     3.32
32.80  -79.76

6 ENE MOUNT PLEASANT         CHARLESTON          SC-CR-119     2.74
32.85  -79.77

8 NE MOUNT PLEASANT          CHARLESTON          SC-CR-146     2.72
32.90  -79.75

WAMBAW RAWS                  CHARLESTON          WMBS1         2.37
32.97  -79.67

5 SSE CHARLESTON             CHARLESTON          SC-CR-60      2.33
32.72  -79.95

8 NE MOUNT PLEASANT          CHARLESTON          SC-CR-192     2.20
32.89  -79.77

7 NE MOUNT PLEASANT          CHARLESTON          SC-CR-112     2.07
32.90  -79.79

Radar loop of Isaias from 8:54 AM - 8:48 PM on August 3, 2020.
Infrared satellite loop beginning at 10:36 AM and ending at 8:31 PM on August 3, 2020.
POST TROPICAL CYCLONE REPORT...HURRICANE ISAIAS...UPDATED
NATIONAL WEATHER SERVICE CHARLESTON SC
1220 PM EDT TUE SEP 8 2020


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...OR WHEN SIGNIFICANT FLOODING ASSOCIATED WITH ISAIAS
OR ITS REMNANTS WAS AFFECTING THE AREA.

COUNTIES INCLUDED...ALLENDALE...BEAUFORT...BERKELEY...BRYAN...
BULLOCH...CANDLER...CHARLESTON...CHATHAM...COLLETON...DORCHESTER...
EFFINGHAM...EVANS...HAMPTON...JASPER...JENKINS...LIBERTY...LONG...
MCINTOSH...SCREVEN...TATTNALL

AUG 11...UPDATED FOR...SECTIONS A AND E

AUG 28...UPDATED FOR...WEATHERFLOW OBSERVATIONS IN SECTIONS A AND B

SEP 8...UPDATED FOR...SECTION B




A. LOWEST SEA LEVEL PRESSURE/MAXIMUM SUSTAINED WINDS AND PEAK GUSTS
---------------------------------------------------------------------
METAR OBSERVATIONS...
NOTE: ANEMOMETER HEIGHT IS 10 METERS AND WIND AVERAGING IS 2 MINUTES
---------------------------------------------------------------------
LOCATION  ID    MIN    DATE/     MAX      DATE/     PEAK    DATE/
LAT  LON        PRES   TIME      SUST     TIME      GUST    TIME
DEG DECIMAL     (MB)   (UTC)     (KT)     (UTC)     (KT)    (UTC)
---------------------------------------------------------------------
KCHS-CHARLESTON INTL AIRPORT SC
32.90 -80.04  1005.2  03/2256   070/022  03/2040   090/037 03/1941

KJZI-CHARLESTON EXECUTIVE AIRPORT SC
32.70 -80.01  1003.7  03/2235   030/022  03/2055   020/035 03/2155

REMARKS:


NON-METAR OBSERVATIONS...
NOTE: ANEMOMETER HEIGHT IN METERS AND WIND AVERAGING PERIOD IN
MINUTES INDICATED UNDER MAXIMUM SUSTAINED WIND IF KNOWN
---------------------------------------------------------------------
LOCATION  ID    MIN    DATE/     MAX      DATE/     PEAK    DATE/
LAT  LON        PRES   TIME      SUST     TIME      GUST    TIME
DEG DECIMAL     (MB)   (UTC)     (KT)     (UTC)     (KT)    (UTC)
---------------------------------------------------------------------
XFOL-FOLLY BEACH PIER-WX FLOW SC
32.65 -79.94  1001.9  03/2229   065/041  03/2306   036/049 04/0139
                                 11/01

XSUL-SULLIVANS ISLAND-WX FLOW SC
32.77 -79.82  999.4   04/0254   105/027  03/2236   037/038 04/0208
                                 13/01

XIOP-ISLE OF PALMS-WX FLOW SC
32.78 -79.79  1000.4  04/0253   048/031  04/0210   054/039 04/0154
                                 08/01

KCXM-DOWNTOWN CHARLESTON-NWS SC
32.78 -79.93  997.6   03/2240   040/028  03/2110   040/034 03/2110
                                 10/10

XTYB-TYBEE ISLAND NORTH-WX FLOW GA
32.02 -80.84                    067/033  03/1724   073/036 03/1724
                                 10/01

XTYE-TYBEE ISLAND SOUTH-WX FLOW GA
31.99 -80.85                    065/031  03/1727   064/037 03/1713
                                 09/01

XBUF-BEAUFORT-WX FLOW SC
32.34 -80.59                    095/022  03/1759   090/029 03/1759
                                 10/01

XCHA-CHARLESTON/BATTERY POINT-WX FLOW SC
32.76 -79.95                    049/027  04/0146   303/033 04/0340
                                 10/01

REMARKS: GUSTS AT WEATHERFLOW SITES ARE 3 SECOND AVERAGES.


B. MARINE OBSERVATIONS...
NOTE: ANEMOMETER HEIGHT IN METERS AND WIND AVERAGING PERIOD IN
MINUTES INDICATED UNDER MAXIMUM SUSTAINED WIND IF KNOWN
---------------------------------------------------------------------
LOCATION  ID    MIN    DATE/     MAX      DATE/     PEAK    DATE/
LAT  LON        PRES   TIME      SUST     TIME      GUST    TIME
DEG DECIMAL     (MB)   (UTC)     (KT)     (UTC)     (KT)    (UTC)
---------------------------------------------------------------------
FBIS1-NDBC FOLLY ISLAND, SC C-MAN
32.69 -79.89  1003.8  03/2300   030/036  03/2110   040/045 03/2202
                                 10/10

41004-NDBC EDISTO BUOY
32.50 -79.10  988.8   03/2240   ---/058  03/2349   290/068 03/2350
                                 04/01

41008-NDBC GRAYS REEF BUOY
31.40 -80.87  1008.0  03/1650   020/031  03/1658   050/037 03/1300
                                 05/01

41033-CARO COOPS FRIPP NEARSHORE BUOY-FRP2
32.28 -80.41  1006.3  03/2123   060/029  03/1953   020/041 03/2108
                                   03/

41029-CARO COOPS CAPERS NEARSHORE BUOY-CAP2
32.81 -79.63  1000.9  03/2308   060/034  03/2353   040/051 03/2238
                                 03/08

FPKG1-NOS FORT PULASKI, GA
32.04 -80.90  1008.8  03/2054   080/027  03/1336   080/035 03/1330
                                   07/

CHTS1-NOS CHARLESTON, SC
32.78 -79.92  1003.1  03/2236   030/030  03/2100   030/037 03/2100
                                   09/

XSUM-WXFLOW FORT SUMTER, SC
32.75 -79.87  998.7   03/2244   066/034  04/0209   066/043 04/0209
                                 12/01

XSHF-WXFLOW SHUTES FOLLY, SC
32.77 -79.91  1001.3  03/2232   056/033  04/0152   057/039 04/0152
                                 13/01

XCLB-WXFLOW CALIBOGUE SOUND, SC
32.11 -80.84                    019/023  03/2046   063/030 03/1726
                                 06/05

REMARKS:


C. STORM TOTAL RAINFALL FROM 1200 UTC AUG 02 UNTIL 1200 UTC AUG 04
---------------------------------------------------------------------
CITY/TOWN                    COUNTY               ID         RAINFALL
LAT LON                                                       (IN)
DEG DECIMAL
---------------------------------------------------------------------
7 NE MCCLELLANVILLE CRN      CHARLESTON          SRES1         7.01
33.15  -79.36

1 ESE MCCLELLANVILLE         CHARLESTON          SC-CR-33      4.51
33.08  -79.46

ISLE OF PALMS                CHARLESTON          SC-CR-166     3.32
32.80  -79.76

6 ENE MOUNT PLEASANT         CHARLESTON          SC-CR-119     2.74
32.85  -79.77

8 NE MOUNT PLEASANT          CHARLESTON          SC-CR-146     2.72
32.90  -79.75

WAMBAW RAWS                  CHARLESTON          WMBS1         2.37
32.97  -79.67

5 SSE CHARLESTON             CHARLESTON          SC-CR-60      2.33
32.72  -79.95

8 NE MOUNT PLEASANT          CHARLESTON          SC-CR-192     2.20
32.89  -79.77

7 NE MOUNT PLEASANT          CHARLESTON          SC-CR-112     2.07
32.90  -79.79



D. INLAND FLOODING...
---------------------------------------------------------------------
---------------------------------------------------------------------

E. MAXIMUM OBSERVED WATER LEVEL (WL)...
---------------------------------------------------------------------
ID     CITY/TOWN       COUNTY     STATE  WL  DATUM  DATE/   SOURCE
       OR LOCATION                      (FT)        TIME
---------------------------------------------------------------------
CHTS1  CHARLESTON      CHARLESTON   SC  1.72 MHHW   03/0012 NOS
32.7808  -79.9236

FPKG1  FORT PULASKI    CHATHAM      GA  1.72 MHHW   04/0142 NOS
32.0367  -80.9017

REMARKS: THE MAXIMUM OBSERVED WATER LEVEL OF 1.72 FT MHHW AT FPKG1
ALSO OCCURRED AT 04/0148 UTC. THE PEAK SURGE AT CHTS1 WAS 2.07 FT AT
03/1606 UTC, 03/1612 UTC AND 03/1624 UTC. THE PEAK SURGE AT FPKG1
WAS 3.19 FT AT 03/1706 UTC.


F. TORNADOES...
---------------------------------------------------------------------
(DIST)CITY/TOWN              COUNTY           DATE/         EF SCALE
LAT LON (DEG DECIMAL)                         TIME(UTC)    (IF KNOWN)
DESCRIPTION
---------------------------------------------------------------------


G. STORM IMPACTS BY COUNTY...
---------------------------------------------------------------------
COUNTY            DEATHS           INJURIES             EVACUATIONS
DESCRIPTION
---------------------------------------------------------------------
CHARLESTON           0                 0                     0

A COMBINATION OF ELEVATED TIDES AND HEAVY RAIN PRODUCED STREET
FLOODING IN PARTS OF DOWNTOWN CHARLESTON. A FALLING TREE PRODUCED
SIGNIFICANT DAMAGE TO AN APARTMENT COMPLEX IN WEST ASHLEY. ANOTHER
TREE FELL ONTO U.S. HIGHWAY 17 NEAR MCCLELLANVILLE. RIP CURRENTS AND
HIGH SURF UP TO 6 FEET OCCURRED IN KIAWAH BEACHWALKER PARK AND IN
ISLE OF PALMS COUNTY PARK.

$$

LEGEND:
I-INCOMPLETE DATA
E-ESTIMATED