NW steering flow brought a short wave trough over SE GA in the late afternoon and early evening which triggered strong to severe storms over an unstable and moist airmass.
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.
NW steering flow brought a short wave trough over SE GA in the late afternoon and early evening which triggered strong to severe storms over an unstable and moist airmass.
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 Aug 10, 4:17 PM EST, 3 minutes earlier.
Area Forecast Discussion
National Weather Service Jacksonville FL
517 PM EDT Sat Aug 10 2019
...FEW STRONG STORMS POSSIBLE THIS EVENING FOR INLAND SOUTHEAST
GEORGIA...
...OPPRESSIVE HEAT AND HUMIDITY CONTINUES THROUGH MIDWEEK...
.Currently...
Late afternoon surface analysis depicts weak high pressure (1018
millibars) centered over the southeast Gulf of Mexico and
extending its axis northwestward towards the central Gulf coast
states. Meanwhile, a backdoor cold front is situated over the
Carolinas, with a weak trough in place to the south of this
boundary over inland southeast Georgia. Aloft...massive ridging
remains centered along the Red River Valley of northern Texas,
while a potent shortwave trough progressing through the St.
Lawrence Valley is amplifying troughing that was already in place
over New England and the Mid-Atlantic states. Widely scattered
convection has been developing along the Atlantic sea breeze and
St. Johns River breeze south of downtown Jacksonville thus far,
with convective coverage recently increasing near the Altamaha
River across inland southeast Georgia as weak shortwave energy
embedded in the prevailing north-northwesterly flow over central
and western Georgia approaches. GOES-East derived Total
Precipitable Water imagery indicates that PWAT values ranging
from 2 to 2.2 inches throughout our regions, with morning
soundings revealing rather mild temperatures aloft and a layer of
dry air between 800-650 millibars (6,500 to 12,000 feet) that is
creating downdraft CAPE values around 1,000 j/kg across our area.
Temperatures have reached 100 degrees at a few of our inland
southeast Georgia locales, with mid to upper 90s elsewhere outside
of thunderstorm activity. Dewpoints ranging from 75-80 across
coastal southeast Georgia, northeast and north central Florida are
combining with the near record heat to result in heat index
values between 105-112 degrees, while dewpoints over inland
southeast Georgia are resulting in slightly lower heat index
values, but still at Heat Advisory criteria (108 degrees) at some
locations.
.Near Term (Late Afternoon through Sunday)...
Late developing convection that is mainly concentrated east of
U.S. Highway 301 thus far will keep heat index values at or above
advisory criteria (108 degrees) for at least another hour, so we
have extended the Heat Advisory through 6 PM. Otherwise, we
expect convective coverage to continue to increase across inland
southeast Georgia through early evening as the aforementioned weak
shortwave approaches from the north-northwest and interacts with
outflow boundaries that will be pushing northward from ongoing
scattered sea/river breeze generated convection over northeast and
north central Florida. Dry air in the low to mid levels will
continue to enhance the potential for isolated wet microbursts
within any stronger activity that develops, which would likely be
along the U.S. Highway 301 and the I-95 corridors in southeast
Georgia and along the St. Johns River basin in northeast Florida,
with downburst winds of 40-50 mph possible along with locally
heavy downpours. Activity will diminish towards midnight over
coastal southeast Georgia, and debris cloudiness will slowly wane
late tonight. Lows will only fall to the mid and upper 70s, except
around 80 at coastal locations. Heat index values will likely
remain in the upper 80s to near 90 at coastal locations overnight.
Ridging aloft over Texas will expand eastward through the lower
Mississippi Valley on Sunday, keeping north-northwesterly steering
flow in place locally as a weak surface pressure pattern otherwise
prevails. Weak surface ridging settling over the Mid-Atlantic
states may push the backdoor cold front over the Carolinas towards
the Savannah River Valley by late afternoon, and weak shortwave
energy within the north-northwest flow aloft should also traverse
inland southeast Georgia by the late afternoon and early evening
hours. These forcing mechanisms will combine with slow moving
mesoscale boundaries such as the Gulf and Atlantic sea breezes and
the St. Johns River breeze to produce a higher coverage of mostly
diurnal convection on Sunday, with numerous storms expected for
areas along and north of the I-10 corridor. Temperatures aloft
will remain mild, with merging outflow boundaries and convective
cells pulsing to strong levels before collapsing, with downburst
winds of 40-50 mph and locally heavy downpours remaining the
primary threats with any stronger activity that develops.
Oppressively hot and humid conditions will prevail before
convective coverage increases during the mid to late afternoon
hours, with highs soaring to the mid and upper 90s and heat index
values maxing out in the 106-111 degree range.
.Short Term (Sunday Night through Tuesday Night)...
Ridging aloft over the southeastern states will gradually flatten
early in the week as the remnant frontal boundary to our north
stalls near the Altamaha/Ocmulgee River basins in southeast
Georgia. Deeper moisture will gradually sink southward to a
position over northeast and north central Florida, with PWATs
falling back to below 2 inches for most of southeast Georgia by
Monday afternoon, where surface pressures will also continue to
gradually fall. Outflow boundaries from numerous afternoon
thunderstorms over northeast and north central Florida will
gradually propagate into inland southeast Georgia by the early
evening hours on Monday and Tuesday, triggering at least widely
scattered thunderstorms.
Later developing convection will allow highs to keep soaring into
the mid and upper 90s for most of inland southeast Georgia, while
gradually deepening low and mid level southwesterly flow will
activate the Gulf coast sea breeze over the Suwannee Valley and
inland north central Florida by early afternoon, keeping highs in
the low to mid 90s elsewhere. Heat index values should again be
near Advisory criteria (108 degrees) on Monday afternoon and may
then fall a few degrees by Tuesday afternoon. Locally heavy
rainfall and briefly gusty winds will continue to be the primary
threats with any stronger convection that develops early in the
week as mid-level temperatures remain mild and PWATs remain above
2 inches for locations south and east of Waycross. Deeper
southwesterly flow may begin to bring convection that will be
firing along the Florida Big Bend/Nature coasts during the morning
hours inland into the Suwannee Valley by the late morning hours
beginning on Tuesday. Convection will otherwise be diurnal in
nature, with lows again only falling to the mid 70s inland and
around 80 at coastal locations.
.Long Term (Wednesday through Friday Night)...
Troughing over the southeastern states will sharpen late this week
as ridging aloft amplifies over the Desert Southwest and also over
the southwestern Atlantic. Persistent southwesterly flow will
advect even deeper tropical moisture levels into our region,
resulting in widespread shower and thunderstorm development each
day, with activity likely developing during the early to mid
morning hours over the Suwannee Valley and inland portions of
north central Florida and then overspreading the rest of our area
as activity moves quickly northeastward. Heavy rainfall may become
a concern by late this week as daily convection potentially trains
over saturated locations. Hot and humid weather may prevail into
Wednesday before convective initiation occurs earlier in the day
later this week, which will cool highs back into the 80s to near
90 by Thursday and Friday. Humid southwesterly flow will keep lows
in the 70s inland to around 80 at coastal locations.
&&
.Aviation...
Scattered showers and storms will develop by mid-afternoon and
have VCTS in forecast after 19z til 02z-03z. TEMPO groups may be
needed by late afternoon/evening as storm coverage increases. West
winds will become se at SSI...SGJ and CRG by 20z as the east coast
seabreeze forms and moves inland.
&&
.Marine...
A loose pressure pattern will prevail over our waters as a weak
frontal boundary remains situated just north of the Georgia
waters and weak ridging remains centered over the Gulf of Mexico
through Monday. Atlantic ridging will then build westward early
next week and will extend its axis across south Florida as
troughing gradually sharpens over the southeastern states, with
thunderstorm chances over our waters increasing beginning on
Sunday afternoon and evening. Southwesterly winds will prevail,
with the Atlantic sea breeze developing over the near shore waters
each afternoon, followed by southerly evening wind surges. Seas
of 2-3 feet will prevail near shore, with the evening wind surges
resulting in seas building to 3-5 feet offshore. Our local
pressure gradient will begin to tighten by midweek as a trough
settles over the Interstate 10 corridor, resulting in
southwesterly winds approaching Caution levels each evening
offshore outside of thunderstorm activity, which should become
widespread by mid to late week.
Rip Currents: A small long period east southeasterly ocean swell
will keep a low-end moderate risk in place at the northeast
Florida beaches through Monday.
&&
.Climate...
Record high temperatures for 8/10 tied thus far this afternoon:
Jacksonville: 99 (ties prior record from 1987)
St. Simons Island: 99 (ties prior from 2006)
Record warm minimum temperatures in jeopardy for 8/10:
Alma, GA: 78 (prior record 77 in 1989)
St. Simons Island: 81 (ties prior record from 2010)
Record high daily dewpoints tied thus far for 8/10
Jacksonville: 79 (ties prior record from 1998)
Gainesville: 79 (ties prior record from 1991)
&&
.PRELIMINARY POINT TEMPS/POPS...
AMG 76 96 76 95 / 40 50 50 50
SSI 82 95 82 91 / 20 50 40 50
JAX 78 96 77 95 / 20 60 50 60
SGJ 79 95 79 93 / 20 50 50 50
GNV 77 95 76 93 / 20 40 20 70
OCF 76 93 76 93 / 10 40 10 60
&&
.JAX WATCHES/WARNINGS/ADVISORIES...
FL...Heat Advisory until 6 PM EDT this evening for Baker-Bradford-
Central Marion-Clay-Coastal Duval-Coastal Flagler-Coastal
Nassau-Coastal St. Johns-Eastern Alachua-Eastern Marion-
Gilchrist-Hamilton-Inland Duval-Inland Flagler-Inland
Nassau-Inland St. Johns-Northern Columbia-Putnam-Southern
Columbia-Suwannee-Union-Western Alachua-Western Marion.
GA...Heat Advisory until 6 PM EDT this evening for Brantley-Clinch-
Coastal Camden-Coastal Glynn-Echols-Inland Camden-Inland
Glynn-Northeastern Charlton-Northern Ware-Pierce-Southern
Ware-Wayne-Western Charlton.
AM...None.
&&
Nelson/Zibura/BrickerSpecial Weather Statement
National Weather Service Jacksonville FL
417 PM EDT Sat Aug 10 2019
FLZ033-038-133-138-102100-
Coastal Flagler FL-Coastal St. Johns FL-Inland Flagler FL-
Inland St. Johns FL-
417 PM EDT Sat Aug 10 2019
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN FLAGLER AND
SOUTHEASTERN ST. JOHNS COUNTIES UNTIL 500 PM EDT...
* At 416 PM EDT, Doppler radar was tracking a strong thunderstorm
near Marineland, or near Palm Coast, moving southeast at 15 mph.
* Winds in excess of 45 mph and minor flooding due to heavy rainfall
is possible with this storm.
* Locations impacted include...
Palm Coast, Flagler Beach, Bunnell, Marineland, Crescent Beach,
Beverly Beach and Espanola.
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.
Heavy rainfall is also 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 2943 8111 2944 8112 2940 8128 2972 8138
2975 8123 2946 8111 2946 8112 2944 8111
TIME...MOT...LOC 2016Z 335DEG 14KT 2964 8128
CORLESSSpecial Weather Statement
National Weather Service Jacksonville FL
420 PM EDT Sat Aug 10 2019
FLZ037-038-102100-
Putnam FL-Inland Flagler FL-
420 PM EDT Sat Aug 10 2019
...SIGNIFICANT WEATHER ADVISORY FOR WESTERN FLAGLER AND NORTHEASTERN
PUTNAM COUNTIES UNTIL 500 PM EDT...
* At 419 PM EDT, Doppler radar was tracking a strong thunderstorm
over East Palatka, moving southeast at 10 mph.
* Winds in excess of 45 mph and minor flooding due to heavy rainfall
is possible with this storm.
* Locations impacted include...
Palatka, East Palatka, Orange Mills and San Mateo.
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.
Heavy rainfall is also 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 2954 8163 2969 8170 2973 8158 2965 8152
2962 8152 2962 8150 2959 8148
TIME...MOT...LOC 2019Z 332DEG 9KT 2967 8161
CORLESSSpecial Weather Statement
National Weather Service Jacksonville FL
457 PM EDT Sat Aug 10 2019
GAZ133-135-136-102145-
Appling GA-Jeff Davis GA-Wayne GA-
457 PM EDT Sat Aug 10 2019
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN WAYNE...APPLING AND
EASTERN JEFF DAVIS COUNTIES UNTIL 545 PM EDT...
* At 457 PM EDT, Doppler radar was tracking a strong thunderstorm
near Plant Hatch, moving east at 15 mph.
* Winds in excess of 45 mph possible with this storm.
* Locations impacted include...
Baxley, Hazlehurst, Graham, Surrency, Plant Hatch and Pine Grove.
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.
Heavy rainfall is also 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 3195 8249 3196 8248 3196 8242 3195 8239
3196 8238 3194 8238 3194 8231 3195 8231
3193 8230 3190 8219 3190 8214 3191 8213
3189 8214 3189 8211 3186 8212 3182 8202
3171 8192 3170 8258 3178 8268 3196 8256
TIME...MOT...LOC 2057Z 271DEG 15KT 3185 8230
CORLESSSpecial Weather Statement
National Weather Service Jacksonville FL
502 PM EDT Sat Aug 10 2019
FLZ037-140-102145-
Putnam FL-Eastern Marion FL-
502 PM EDT Sat Aug 10 2019
...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN MARION AND SOUTH
CENTRAL PUTNAM COUNTIES UNTIL 545 PM EDT...
* At 502 PM EDT, Doppler radar was tracking a strong thunderstorm
near Salt Springs, moving north at 15 mph.
* Winds in excess of 45 mph and minor flooding due to heavy rainfall
is possible with this storm.
* Locations impacted include...
Salt Springs, Fruitland, Lake Delancy, Welaka and Georgetown.
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.
Heavy rainfall is also 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 2943 8189 2949 8163 2934 8160 2932 8168
2930 8167 2930 8166 2928 8164 2922 8164
2919 8181
TIME...MOT...LOC 2102Z 163DEG 12KT 2930 8172
CORLESSThe Jacksonville radar (KJAX), 37 km away, was scanning. The volume nearest the first event began at 21:18 UTC.
3 thunderstorm wind. Local standard time, as filed.
A tree was blown down along Laurel Island Parkway near the intersection of March Harbour Parkway. The time of damage was based on radar. The cost of damage was estimated.
Large tree branches were blown down near State Road 40. The time of damage was based on radar. The cost of damage was estimated.
A tree was blown down along State Road 110. The time of damage was based on radar.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Georgia in 2019Every state in 2019This day in weather historyWarnings in Georgia, August 2019
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: 843274, 843275, 843276.