A weak low pressure system drifted slowly NE along the GA/SC coastline away from the SE GA/NE FL area, with a moist/tropical airmass in its wake. Westerly flow combined|with diurnal heating produced numerous showers and scattered thunderstorms with the main impact heavy rainfall from slow moving storms.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS JAX wrote it up.
A weak low pressure system drifted slowly NE along the GA/SC coastline away from the SE GA/NE FL area, with a moist/tropical airmass in its wake. Westerly flow combined|with diurnal heating produced numerous showers and scattered thunderstorms with the main impact heavy rainfall from slow moving storms.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Jacksonville, FL wrote its last area forecast discussion before the first event at Jul 27, 12:11 PM EST, 2 hours 27 minutes earlier.
Area Forecast Discussion National Weather Service Jacksonville FL 111 PM EDT Tue Jul 27 2021 .AVIATION... [Through 18Z Wednesday] Next few hours will be active at NE FL TAF sites with TEMPO groups at all five locations in the 18-22Z time frame, while it will take a bit later to reach the SSI TAF site with additional storms in the 20-24Z time frame. Expect a period of IFR CIGS/VSBYS possible at all these TAF sites through 00z, then a rebound towards VFR with VCSH after sunset as the moist/tropical atmosphere rains itself out during the overnight hours. && .PREV DISCUSSION [847 AM EDT]... .NEAR TERM [Through Tonight]... Pre-dawn hours... A weak surface low was located over Glynn County Georgia this morning and will make a very slow drift toward northward across southeast Georgia this morning. Surface based convergence is indicated along the Georgia coast and coastal plains of Georgia where the best rainfall and instability resides with embedded convection continues particularly near the the mouth of the Altamaha River Basin. Across the Suwannee Valley some isolated convection is occurring with showers extending into Alachua County. During the remaining pre-dawn hours isolated to scattered showers will continue across Southeast Georgia and Northeast Florida with a prevailing southwesterly flow with abundant tropical moisture with precipitable water values in the 2.1 to 2.4 inch range. Today... Elevated rain chances with a remnant and wake trough axis across SE GA and near the I-10 corridor of NE FL brining the potential for locally heavy, potentially flooding rainfall. The Excessive Rainfall Outlook from WPC still has SE GA to a Slight Risk for today. The low will continue to drift toward Savannah, potentially towards the South Carolina coast, but remaining in a weakened state. At the same time, subtropical ridge from the Atlantic will extend west across the south-central Florida peninsula and into the eastern Gulf. With the ridge axis to the south, a southwest flow regime will prevail across the region. This pattern will support scattered showers and storms over the Gulf waters and along west coast of Florida during the early morning hours, with the convection then shifting east over the Suwannee Valley and interior southeast Georgia by late morning and increasing in areal coverage east of highway 301 toward the coast each afternoon and early evening along the sea breeze boundaries where the highest rain chances (Pops 50- 70%) will reside. Locally heavy rain and localized minor flooding in addition to localized strong gusts and frequent lightning. Southwest flow will aid in very warm temperatures reaching the low to mid 90s, with much higher moisture leading to head indices of 101 to 106 degrees. Tonight... With the loss of daytime heating, showers and thunderstorms will gradually subside to scattered in areal coverage this evening with numerous showers and storms mainly confined to the coastal areas during the early to mid evening. During the pre-dawn hours early start to activity along the Big Bend is expected, with some showers spilling into the north central Florida and Suwannee Valley near daybreak. Overnight lows in the mid 70s. .SHORT TERM [Wednesday Through Thursday]... A shortwave trough over the US east coast will move into the western Atlantic waters on Wednesday with SW flow aloft. At the surface, high pressure ridging will extend from the western Atlantic into south FL, keeping west to southwest low level flow over the area with high PWAT levels well over 2.0 inches remaining over the area. The SW low level flow will also allow the Gulf coast seabreeze to progress inland and collide with a weaker Atlantic seabreeze. The shortwave energy aloft, diurnal heating and seabreeze collisions will lead to numerous showers and thunderstorm coverage across NE FL and SE GA. Mid level 500 mb temperatures will be near climatology around -6 to -7 Celsius which should only support a strong wind gust potential in cell mergers and locally heavy rainfall due to slow storm motions. Thursday, the shortwave trough will exit east of the region and mid level ridging will move in from the NW. Drier air will move in from the north around surface high pressure centered over the mid south. Higher PWATS around 2.0 inches will linger over NE FL areas leading to numerous showers and storm coverage while drier air with PWATs closer to 1.5 inches should limit storm coverage across SE GA with isolated to scattered coverage expected. High temperatures will be in the upper 80s over inland NE FL areas along the I-75 corridor due to the inward progressing Gulf seabreeze on Wednesday to around 90 degrees along the first coast and near seasonal highs in the low 90s on Thursday. Lows Thursday morning will be in the low to mid 70s inland and the upper 70s at the coast. .LONG TERM [Friday Through Tuesday]... A mid level ridge will be NW of the region over the southern plains while mid to upper level troughing will be over the northeast US. Surface high pressure will be over the central Gulf of Mexico and keep light southwest winds over the area. Drier air aloft will limit convection Friday and Saturday with scattered storm coverage. The mid to upper level trough will deepen from Sunday into early next week as a shortwave rounds the base of the east coast trough and pushes a cold front southward towards the region. This will allow moisture to increase over the area while shortwave energy aloft and diurnal heating enhance storm coverage into early next week. Temperatures will become hotter late this week with mid 90s across the area Friday into the weekend, then cooling to slightly below seasonal values early next week in the upper 80s to around 90. Heat index values will increase to near advisory levels Friday into the weekend in the 106-110 range. .MARINE... Today nearshore waters will have waves of 2 to 3 feet and offshore waters 3 to 4 feet. The rest of the week the local waters will have mainly weak winds. Seas 2 feet nearshore, and up to 3 feet offshore. Prevailing winds today will be southerly in the wake of the low moving up the Georgia coast into South Carolina. Wednesday through the end of the week, prevailing winds will be offshore and west-southwesterly. Over the nearshore waters, the east coast seabreeze will be mainly pinned over the local waters. A couple afternoons the sea breeze main move near the coast with winds briefly shifting to the SE/S behind it at 10-15 knots. The highest coverage of showers/storms will occur late in the day with the west coast sea breeze will be the most dominate. Cloud-to- ground lightning strikes and a few wind gusts to 35 knots will be the main threats to mariners. Rip Currents: Moderate risk through today. Low risk the rest of the week. .HYDROLOGY... An area of low pressure north of the Altamaha River Basin will continue to move northward over the coastal Plains of Georgia toward South Carolina late in the day. Very weak steering flow today will allow storms to move very slow this afternoon. Rainfall rates of 1-3 inches per hour are possible this afternoon This will lead to locally heavy rainfall, with ponding on roads and localized flooding possible. Rivers levels continue to fall with minor flooding ongoing along the lower portions of the Santa Fe River. && .PRELIMINARY POINT TEMPS/POPS... AMG 73 90 72 95 74 / 80 80 20 30 10 SSI 76 88 75 90 79 / 50 70 40 30 10 JAX 74 91 73 93 75 / 60 70 40 50 10 SGJ 74 90 74 90 75 / 40 60 40 50 10 GNV 74 91 73 91 74 / 50 80 30 70 10 OCF 74 90 74 91 74 / 40 70 30 70 10 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...None. GA...None. AM...None. &&
Special Weather Statement National Weather Service Jacksonville FL 227 PM EDT Tue Jul 27 2021 FLZ136-137-237-271915- Eastern Alachua FL-Eastern Putnam FL-Western Putnam FL- 227 PM EDT Tue Jul 27 2021 ...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL ALACHUA AND NORTHWESTERN PUTNAM COUNTIES UNTIL 315 PM EDT... * At 227 PM EDT, National Weather Service meteorologists were tracking a strong thunderstorm near Melrose Landing, or near Interlachen, moving east at 15 mph. * Winds in excess of 45 mph and minor flooding due to heavy rainfall is possible with this storm. * Locations impacted include... Palatka, Interlachen, Hawthorne, Melrose Landing, Bardin, Hollister, Florahome, Johnson, Carraway and Mannville. PRECAUTIONARY/PREPAREDNESS ACTIONS... These winds can down small tree limbs and branches, and blow around unsecured small objects. Seek shelter in a safe building until the storm passes. To report severe weather, contact your nearest law enforcement agency. You can also share your report with NWS Jacksonville on Facebook and Twitter. && LAT...LON 2952 8172 2952 8214 2973 8200 2974 8161 TIME...MOT...LOC 1827Z 266DEG 12KT 2961 8199 ZIBURA
Special Weather Statement
National Weather Service Jacksonville FL
233 PM EDT Tue Jul 27 2021
GAZ132-149-271915-
Atkinson GA-Coffee GA-
233 PM EDT Tue Jul 27 2021
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN COFFEE AND
NORTHWESTERN ATKINSON COUNTIES UNTIL 315 PM EDT...
* At 232 PM EDT, National Weather Service meteorologists were
tracking a strong thunderstorm near Willacoochee, moving southeast
at 10 mph.
* Winds in excess of 40 mph and minor flooding due to heavy rainfall
is possible with this storm.
* Locations impacted include...
Willacoochee.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Jacksonville on
Facebook and Twitter.
&&
LAT...LON 3149 8293 3130 8286 3129 8305 3130 8305
3131 8306 3133 8306 3135 8308 3135 8309
3147 8313
TIME...MOT...LOC 1832Z 333DEG 8KT 3140 8303
ZIBURASpecial Weather Statement National Weather Service Jacksonville FL 237 PM EDT Tue Jul 27 2021 FLZ133-271915- Coastal St. Johns FL- 237 PM EDT Tue Jul 27 2021 ...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL ST. JOHNS COUNTY UNTIL 315 PM EDT... * At 236 PM EDT, National Weather Service meteorologists were tracking a strong thunderstorm near South Ponte Vedra, or near Saint Augustine, moving southeast at 10 mph. * Minor flooding due to heavy rainfall is possible with this storm. * Locations impacted include... Saint Augustine, Vilano Beach, South Ponte Vedra and Guana River State Park. PRECAUTIONARY/PREPAREDNESS ACTIONS... Winds can down small tree limbs and branches, and blow around unsecured small objects. Seek shelter in a safe building until the storm passes. Torrential rainfall is occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. To report severe weather, contact your nearest law enforcement agency. You can also share your report with NWS Jacksonville on Facebook and Twitter. && LAT...LON 2988 8139 3007 8142 3008 8131 2989 8128 TIME...MOT...LOC 1836Z 333DEG 8KT 2997 8137 ZIBURA
Special Weather Statement National Weather Service Jacksonville FL 253 PM EDT Tue Jul 27 2021 GAZ132-149-271930- Atkinson GA-Coffee GA- 253 PM EDT Tue Jul 27 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN COFFEE AND NORTHEASTERN ATKINSON COUNTIES UNTIL 330 PM EDT... * At 252 PM EDT, National Weather Service meteorologists were tracking a strong thunderstorm 8 miles northeast of Pearson, moving south at 15 mph. * Minor flooding due to heavy rainfall is possible with this storm. * This storm will remain over mainly rural areas of southeastern Coffee and northeastern Atkinson Counties. PRECAUTIONARY/PREPAREDNESS ACTIONS... Winds can down small tree limbs and branches, and blow around unsecured small objects. Seek shelter in a safe building until the storm passes. Torrential rainfall is occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. To report severe weather, contact your nearest law enforcement agency. You can also share your report with NWS Jacksonville on Facebook and Twitter. && LAT...LON 3136 8267 3137 8285 3148 8285 3148 8267 TIME...MOT...LOC 1852Z 012DEG 13KT 3140 8278 ZIBURA
Special Weather Statement National Weather Service Jacksonville FL 311 PM EDT Tue Jul 27 2021 FLZ033-133-272000- Coastal St. Johns FL-Inland St. Johns FL- 311 PM EDT Tue Jul 27 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN ST. JOHNS COUNTY UNTIL 400 PM EDT... * At 310 PM EDT, National Weather Service meteorologists were tracking a strong thunderstorm over Saint Augustine South, or near Saint Augustine, moving south at 10 mph. * Winds in excess of 45 mph and minor flooding due to heavy rainfall is possible with this storm. * Locations impacted include... Saint Augustine, Saint Augustine Beach, Crescent Beach, Saint Augustine Shores, Butler Beach, Saint Augustine South, Anastasia, Dupont Center and Elkton. PRECAUTIONARY/PREPAREDNESS ACTIONS... These winds can down small tree limbs and branches, and blow around unsecured small objects. Seek shelter in a safe building until the storm passes. Torrential rainfall is occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. To report severe weather, contact your nearest law enforcement agency. You can also share your report with NWS Jacksonville on Facebook and Twitter. && LAT...LON 2987 8146 2989 8128 2968 8122 2964 8145 TIME...MOT...LOC 1910Z 345DEG 9KT 2985 8134 ZIBURA
Special Weather Statement
National Weather Service Jacksonville FL
316 PM EDT Tue Jul 27 2021
GAZ149-271945-
Atkinson GA-
316 PM EDT Tue Jul 27 2021
...SIGNIFICANT WEATHER ADVISORY FOR EASTERN ATKINSON COUNTY UNTIL 345
PM EDT...
* At 316 PM EDT, National Weather Service meteorologists were
tracking a strong thunderstorm over Pearson, moving south at 15
mph.
* Winds in excess of 45 mph and minor flooding due to heavy rainfall
is possible with this storm.
* Locations impacted include...
Pearson and Axson.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These winds can down small tree limbs and branches, and blow around
unsecured small objects. Seek shelter in a safe building until the
storm passes.
Torrential rainfall is occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
To report severe weather, contact your nearest law enforcement
agency. You can also share your report with NWS Jacksonville on
Facebook and Twitter.
&&
LAT...LON 3137 8287 3136 8270 3118 8270 3118 8275
3119 8290
TIME...MOT...LOC 1916Z 354DEG 13KT 3132 8282
ZIBURAThe national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
The road was flooded along Cordova Street about 2 ft deep near the Mojo Restaurant.
The southbound lanes of U.S. Highway 1 were flooded near the intersection of US Highway 1 and Venetian Blvd near a construction zone.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2021Every state in 2021This day in weather historyWarnings in Florida, July 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 965704, 965705.