A nearly stationary front was across NE Florida, with waves of upper level moving across the front. A severe thunderstorm developed just south of the front during the early morning hours across St.
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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 nearly stationary front was across NE Florida, with waves of upper level moving across the front. A severe thunderstorm developed just south of the front during the early morning hours across St. Johns county and produced large hail as it track toward the Atlantic coast. Localized heavy rainfall was also reported.
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 Apr 7, 9:53 PM EST, 2 hours 8 minutes earlier.
Area Forecast Discussion
National Weather Service Jacksonville FL
1053 PM EDT Sat Apr 7 2018
...BREEZY AND MUCH COOLER ALONG THE NORTHEAST FLORIDA COAST AND
SOUTHEAST GEORGIA ON SUNDAY...
.UPDATE...
Late evening surface analysis depicts a cold front moving
southeastward across inland southeast Georgia and the Florida Big
Bend region. Low pressure (1004 millibars) was organizing along
the Carolina coast and was poised to accelerate northeastward
while strengthening overnight. Aloft...a potent shortwave trough
was pivoting eastward across the Tennessee Valley, while a
powerful jet streak of 150 knots around 250 millibars (35,000
feet) was diving south-southeastward from the Mid-Mississippi
Valley into the southeastern states, which was sharpening a trough
that is digging over the eastern third of the nation. Light
showers along the cold front over the Florida Big Bend were
waning, with post-frontal stratus and a few showers diving into
interior southeast Georgia. Cold air advection is lagging the cold
frontal passage slightly, so temperatures and dewpoints at 02Z
were generally in the 60s area-wide.
A few light showers will be possible overnight, roughly from
Interstate 10 northward, along and in the wake of the cold front,
which will move offshore and through north central Florida during
the predawn hours. Otherwise, low stratus will overspread our
region during the predawn and early morning hours on Sunday. Cold
air advection in the wake of the frontal boundary will drop lows
to the upper 40s and lower 50s for southeast Georgia, with mid 50s
expected along the Interstate 10 corridor and the lower 60s for
north central Florida.
The cold front will stall over central Florida on Sunday as
cold surface ridging builds southeastward from the Great Lakes
states early in the day to the Carolina coast by the evening
hours. Low level winds will quickly veer to northeasterly by the
late morning hours over our region, and these winds may keep lower
stratus clouds locked in along coastal locations and inland north
central Florida through at least the early afternoon hours. Skies
should become partly cloudy over the northern Suwannee Valley and
inland southeast Georgia by the late morning hours. Clouds will be
on the increase from south to north by late afternoon and evening
as isentropic lift develops over our region, with the frontal
boundary beginning to lift northward as a warm front by the
evening hours, with isolated to widely scattered mainly light
showers possible over north central Florida towards sunset. Breezy
onshore winds along the northeast Florida coast and throughout
southeast Georgia will keep highs on Sunday in the mid 60s, with
highs reaching the low to mid 70s for north central Florida and
the Suwannee Valley.
&&
.AVIATION...
MVFR ceilings will redevelop overnight at the regional terminals
as low stratus increases along and in the wake of the cold front.
A few light showers may accompany the front overnight at SSI and
at the Duval County terminals. IFR ceilings are possible at the
regional terminals after 08Z, and ceilings around or just under
1000 feet may persist through 14Z/15Z on Sunday. Ceilings will
likely remain at MVFR levels after 15Z at the regional terminals
as surface winds become northeasterly and increase to near 15
knots at the coastal terminals.
&&
.MARINE...
A strong cold front will push across our coastal waters after
midnight. Small Craft Advisory conditions will continue over the
offshore waters overnight as southwest winds of 20-25 knots shift
to northwesterly behind the cold front after midnight. Winds are
expected to remain at Caution levels in the near shore waters on
overnight. High pressure in the wake of this front will dive east
southeastward from the Great Lakes region early on Sunday to near
the Mid-Atlantic coast by early Monday. Winds will become
northeasterly by the late morning hours on Sunday, with Caution
level wind speeds expected offshore and just under Caution levels
near shore. The front that moves across the waters on Saturday
night will then return northward as a warm front on Monday, with
low pressure developing along the front over the coastal Carolina
region on Tuesday. Onshore winds will fall below Caution levels on
Sunday evening. Low pressure will then accelerate northeastward,
with another cold front crossing our waters towards midweek.
Rip Currents: Moderate risk possible by Sunday afternoon as breezy
onshore winds develop.
&&
.PRELIMINARY POINT TEMPS/POPS...
AMG 49 65 51 67 / 40 10 50 20
SSI 52 60 55 71 / 60 10 40 30
JAX 55 65 56 78 / 50 10 30 30
SGJ 60 65 60 80 / 50 20 40 40
GNV 59 73 58 80 / 20 20 40 60
OCF 63 74 60 82 / 40 30 30 60
&&
.JAX WATCHES/WARNINGS/ADVISORIES...
FL...None.
GA...None.
AM...Small Craft Advisory until 4 AM EDT Sunday for Waters from
Altamaha Sound GA to Fernandina Beach FL from 20 to 60 NM-
Waters from Fernandina Beach to St. Augustine FL from 20 to
60 NM-Waters from St. Augustine to Flagler Beach FL from 20
to 60 NM.
&&
Nelson/Elsenheimer/McGinnisPRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
712 PM EDT SAT APR 7 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0250 PM LIGHTNING WHITE SPRINGS 30.33N 82.76W
04/07/2018 HAMILTON FL EMERGENCY MNGR
*** 1 FATAL, 4 INJ *** HAMILTON COUNTY EMERGENCY
MANAGEMENT REPORTS ONE FATALITY...UNCONFIRMED BY THE
STATE MEDICAL EXAMINER...AND FOUR ADDITIONAL INJURIES
RESULTING FROM A LIGHTNING STRIKE AT A MUD BOG EVENT NEAR
WHITE SPRINGS.
&&
NELSONPRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
716 PM EDT SAT APR 7 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0657 PM TSTM WND DMG 4 WNW PALM COAST 29.59N 81.28W
04/07/2018 Flagler FL EMERGENCY MNGR
TREE DOWN AT MATANZAS AND US 1. A FEW OTHER TREES DOWN IN
PALM COAST
&&
CELSENThe Jacksonville radar (KJAX), 110 km away, was scanning. The volume nearest the first event began at 05:01 UTC.
4 hail, 3 heavy rain. Local standard time, as filed.
A spotter along Birchwood Place measured 10.75 inches of rainfall between Sunday April 8th and Tuesday afternoon April 10th.
The public measured 6.75 inches of rainfall in the past 20 hours.
Hail 3 inches in diameter was reported 1.5 miles south of Pacetti Road and State Road 16.
Large 3 inch hail was reported in the Trunberry neighborhood near the edge of Woods Road.
Numerous reports of ping-pong ball sized hail were reported in World Golf Village, Murabella, Pacetti Bay Middle School and Sumara Lakes.
Large hail was reported in the Murabella subdivision.
There was a washout on County Road 95 about a half mile south of County Road 2006. There was some street flooding reported nearby on County Road 2007.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2018Every state in 2018This day in weather historyWarnings in Florida, April 2018
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: 749665, 749663, 749651, 749652, 749653, 749656, 749672.