083
WTNT32 KNHC 210534
TCPAT2
BULLETIN
TROPICAL STORM BERTHA INTERMEDIATE ADVISORY NUMBER 7A
NWS NATIONAL HURRICANE CENTER MIAMI FL AL022026
100 AM CDT TUE JUL 21 2026
...AIRCRAFT AND SATELLITE WIND DATA INDICATE THAT BERTHA IS
STRONGER...
SUMMARY OF 100 AM CDT...0600 UTC...INFORMATION
----------------------------------------------
LOCATION...28.4N 86.1W
ABOUT 125 MI...205 KM S OF PANAMA CITY FLORIDA
ABOUT 200 MI...320 KM SE OF MOBILE ALABAMA
MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H
PRESENT MOVEMENT...NW OR 320 DEGREES AT 2 MPH...4 KM/H
MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
NONE.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A TROPICAL STORM WARNING IS IN EFFECT FOR...
* ALABAMA/FLORIDA BORDER TO THE JEFFERSON/PLAQUEMINES PARISH BORDER
IN LOUISIANA
A STORM SURGE WATCH IS IN EFFECT FOR...
* ALABAMA/FLORIDA BORDER TO THE MOUTH OF THE MISSISSIPPI RIVER
A TROPICAL STORM WATCH IS IN EFFECT FOR...
* BAY/GULF COUNTY LINE IN FLORIDA WESTWARD TO THE FLORIDA/ALABAMA
BORDER
* WEST OF THE JEFFERSON/PLAQUEMINES PARISH BORDER TO MORGAN CITY,
LOUISIANA
* METROPOLITAN NEW ORLEANS, LAKE PONTCHARTRAIN, AND LAKE MAUREPAS
A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE
EXPECTED SOMEWHERE WITHIN THE WARNING AREA WITHIN 36 HOURS.
A STORM SURGE WATCH MEANS THERE IS A POSSIBILITY OF LIFE-
THREATENING INUNDATION, FROM RISING WATER MOVING INLAND FROM THE
COASTLINE, IN THE INDICATED LOCATIONS DURING THE NEXT 48 HOURS.
FOR A DEPICTION OF AREAS AT RISK, PLEASE SEE THE NATIONAL WEATHER
SERVICE STORM SURGE WATCH/WARNING GRAPHIC, AVAILABLE AT
HURRICANES.GOV.
A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE
POSSIBLE WITHIN THE WATCH AREA, IN THIS CASE IN THE NEXT 24 TO 48
HOURS.
ADDITIONAL WATCHES OR WARNINGS MAY BE REQUIRED LATER TODAY.
FOR STORM INFORMATION SPECIFIC TO YOUR AREA, INCLUDING POSSIBLE
INLAND WATCHES AND WARNINGS, PLEASE MONITOR PRODUCTS ISSUED BY YOUR
LOCAL NATIONAL WEATHER SERVICE FORECAST OFFICE.
DISCUSSION AND OUTLOOK
----------------------
AT 100 AM CDT (0600 UTC), THE CENTER OF TROPICAL STORM BERTHA WAS
LOCATED BY AIR FORCE RECONNAISSANCE AIRCRAFT NEAR LATITUDE 28.4
NORTH, LONGITUDE 86.1 WEST. BERTHA IS MOVING TOWARD THE NORTHWEST
NEAR 2 MPH (4 KM/H). A SLOW NORTHWESTWARD TO WEST-NORTHWESTWARD
MOTION IS EXPECTED TODAY FOLLOWED BY A TURN WESTWARD BY THE
MIDDLE PART OF THIS WEEK. ON THE FORECAST TRACK, BERTHA WILL MOVE
NEAR OR ALONG THE NORTHERN GULF COAST DURING THE NEXT SEVERAL DAYS.
AIRCRAFT AND SATELLITE-WIND DATA INDICATE THAT MAXIMUM SUSTAINED
WINDS HAVE INCREASED TO NEAR 50 MPH (85 KM/H) WITH HIGHER GUSTS.
SOME ADDITIONAL INTENSIFICATION IS POSSIBLE OVER THE NEXT DAY OR
SO.
TROPICAL-STORM-FORCE WINDS EXTEND OUTWARD UP TO 70 MILES (110 KM)
FROM THE CENTER.
THE MINIMUM CENTRAL PRESSURE ESTIMATED FROM AIR FORCE RESERVE
RECONNAISSANCE AIRCRAFT OBSERVATIONS IS 998 MB (29.47 INCHES).
HAZARDS AFFECTING LAND
----------------------
KEY MESSAGES FOR TROPICAL STORM BERTHA CAN BE FOUND IN THE TROPICAL
CYCLONE DISCUSSION UNDER AWIPS HEADER MIATCDAT2 AND WMO HEADER
WTNT42 KNHC.
WIND: TROPICAL STORM CONDITIONS ARE EXPECTED WITHIN THE WARNING
AREA ALONG THE NORTHERN GULF COAST BY LATE TODAY INTO WEDNESDAY.
TROPICAL STORM CONDITIONS ARE POSSIBLE IN THE WATCH AREA IN THE
FLORIDA PANHANDLE LATER TODAY. TROPICAL STORM CONDITIONS ARE
POSSIBLE WITHIN THE WATCH AREA IN LOUISIANA BY LATE TONIGHT INTO
WEDNESDAY.
STORM SURGE: THE COMBINATION OF STORM SURGE AND THE TIDE WILL
CAUSE NORMALLY DRY AREAS NEAR THE IMMEDIATE COAST TO BE FLOODED BY
RISING WATERS MOVING INLAND FROM THE SHORELINE. THE WATER COULD
REACH THE FOLLOWING HEIGHTS ABOVE GROUND SOMEWHERE IN THE INDICATED
AREAS IF THE PEAK SURGE OCCURS AT THE TIME OF HIGH TIDE...
MOUTH OF THE MISSISSIPPI RIVER, LA TO AL/FL BORDER...2-4 FT
INDIAN PASS, FL TO CHASSAHOWITZKA, FL...1-3 FT
MORGAN CITY, LA TO MOUTH OF THE MISSISSIPPI RIVER, LA...1-3 FT
LAKE PONTCHARTRAIN...1-3 FT
THE DEEPEST WATER WILL OCCUR ALONG THE IMMEDIATE COAST.
SURGE-RELATED FLOODING DEPENDS ON THE RELATIVE TIMING OF THE SURGE
AND THE TIDAL CYCLE, AND CAN VARY GREATLY OVER SHORT DISTANCES. FOR
INFORMATION SPECIFIC TO YOUR AREA, PLEASE SEE PRODUCTS ISSUED BY
YOUR LOCAL NATIONAL WEATHER SERVICE FORECAST OFFICE.
FOR A COMPLETE DEPICTION OF AREAS AT RISK OF STORM SURGE
INUNDATION, PLEASE SEE THE NATIONAL WEATHER SERVICE PEAK
STORM SURGE GRAPHIC, AVAILABLE AT
HURRICANES.GOV/GRAPHICS_AT2.SHTML?PEAKSURGE.
RAINFALL: BERTHA IS EXPECTED TO PRODUCE RAINFALL AMOUNTS OF 2 TO 4
INCHES WITH ISOLATED HIGHER TOTALS AROUND 8 INCHES THROUGH THURSDAY
ALONG THE GULF COAST AND ADJACENT INLAND LOCATIONS FROM WESTERN
FLORIDA INTO SOUTHERN LOUISIANA, INCLUDING SOUTHERN PORTIONS OF
ALABAMA AND MISSISSIPPI. THIS RAINFALL MAY PRODUCE AREAS OF FLASH
FLOODING, ESPECIALLY IN URBAN AREAS.
FOR A COMPLETE DEPICTION OF FORECAST RAINFALL ASSOCIATED WITH
BERTHA, PLEASE SEE THE NATIONAL WEATHER SERVICE STORM TOTAL RAINFALL
GRAPHIC AVAILABLE AT HURRICANES.GOV/GRAPHICS_AT2.SHTML?RAINQPF AND
THE FLASH FLOOD RISK GRAPHIC AT
HURRICANES.GOV/GRAPHICS_AT2.SHTML?ERO.
SURF: SWELLS GENERATED BY BERTHA ARE AFFECTING PORTIONS OF THE
GULF COAST OF FLORIDA AND ARE LIKELY TO SPREAD WESTWARD DURING
THE WEEK. THESE SWELLS ARE LIKELY TO CAUSE LIFE-THREATENING SURF
AND RIP CURRENT CONDITIONS. PLEASE CONSULT PRODUCTS FROM YOUR
LOCAL WEATHER OFFICE.
A DEPICTION OF RIP CURRENT RISK FOR THE UNITED STATES CAN BE FOUND
AT: HURRICANES.GOV/GRAPHICS_AT2.SHTML?RIPCURRENTS
NEXT ADVISORY
-------------
NEXT COMPLETE ADVISORY AT 400 AM CDT.
FORECASTER PAPIN
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