Onshore flow and a long period ground swell created a moderate risk of rip currents at local beaches.
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The episode as NWS JAX wrote it up.
Onshore flow and a long period ground swell created a moderate risk of rip currents at local beaches.
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 13, 11:05 AM EST, 2 hours 55 minutes earlier.
Area Forecast Discussion National Weather Service Jacksonville FL 1205 PM EDT Sat Apr 13 2019 ...HOT AND HUMID CONDITIONS INLAND THIS AFTERNOON AND AGAIN ON SUNDAY... ...FEW STRONG THUNDERSTORMS POSSIBLE LATE THIS AFTERNOON IN SOUTHEAST GEORGIA... .Update... Late morning surface analysis depicts a stalling frontal boundary over central and northeastern Georgia, extending southwestward across the lower Mississippi Valley through Deep South Texas. Low pressure (999 millibars) was strengthening over the lower Rio Grande Valley. Aloft...an intense shortwave trough was located over west Texas and was moving slowly eastward, and this feature is strengthening west-southwesterly flow aloft over our region as deep-layered ridging nudges east of the Bahamas and extends through the northwestern Caribbean Sea. Increasingly diffluent flow aloft has developed a thin cirrus shield over most of our region, with strengthening southerly low level winds lining up developing cumulus cloud streets over our area as temperatures were quickly rising into the lower 80s as of 16Z. Enough low level convergence exists along the Interstate 95 corridor for shower development just north of the Altamaha River. Otherwise, near record levels of humidity are in place locally (see Climate section below), with values now mixing back to the upper 60s as temperatures soar. Latest short-term, high resolution guidance indicates that widely scattered convection will develop along the U.S. Highway 301 corridor in both southeast Georgia and northeast / north central Florida during the mid to late afternoon hours as the Atlantic sea breeze boundary pushes well inland, where high temperatures this afternoon will approach 90 degrees. A few strong thunderstorm are possible by late afternoon or near sunset along or just south of the Altamaha River in southeast Georgia, generally near U.S. 301 as ML CAPE values approach 1500 j/kg and abundant mid-level dry air above 750 millibars (8000 feet) and steepening lapse rates potentially increase downburst potential. Lapse rates are progged to be less steep over northeast and north central Florida, but models indicate activity possibly persisting well into the evening hours along the St. Johns River basin, with boundary interactions also keeping at least isolated convection possible into the overnight hours for inland portions of southeast Georgia. Otherwise, unseasonably high dewpoints will result in heat index values climbing into the lower 90s for many inland locations, while breezy southeasterly winds keep coastal highs in the lower 80s this afternoon. Southerly surface winds should remain sustained in the 5-10 mph range overnight, negating fog formation and resulting in another night of record warm minimum temperatures, with lows only falling to the upper 60s and lower 70s. && .Aviation... MVFR ceilings persisting at CRG should lift to VFR by 18Z. Widely scattered showers and a few thunderstorms are expected to develop just west of SSI towards 20Z, and we placed VCTS in the latest TAFs as activity will likely remain just inland near the I-95 corridor. This convection could impact the Duval County terminals and GNV after 20Z, and we may place VCTS in the 18Z TAF package to account for this possibility. Otherwise, VFR conditions should prevail through at least 08Z, with MVFR ceilings of 1000-1500 feet possible at the regional terminals thereafter. A few showers may also linger overnight and impact the terminals. Breezy southerly winds sustained at 10-15 knots early this afternoon will shift to southeasterly by 18Z at the coastal terminals and towards 21Z inland. && .Marine... A frontal boundary pushing into central Georgia early this afternoon will stall just to the northwest of the Georgia waters tonight. Meanwhile, strong high pressure centered north of Bermuda will keep breezy southeasterly winds in place, with seas just below Caution levels offshore this afternoon. Meanwhile, low pressure developing over Deep South Texas today will strengthen as it pivots northeastward through the lower Mississippi Valley tonight, which will shift prevailing winds to southerly while our local pressure gradient tightens further, resulting in Caution level winds and seas offshore and winds just below Caution levels near shore. Low pressure will then accelerate northeastward across the Tennessee and Ohio Valleys on Sunday, with Caution level wind speeds developing over the near shore waters. Showers and thunderstorms may impact the waters during the afternoon hours, with another round during the overnight hours as this system's cold front crosses our area. Small Craft Advisory conditions are expected to develop throughout our region by Sunday evening as southwesterly winds strengthen just ahead of the front and seas offshore peak in the 5-7 foot range, with 3-5 foot seas prevailing near shore. Winds will shift to west-northwesterly in the wake of the frontal passage, with Small Craft Advisory speeds prevailing on Monday offshore and Caution level speeds near shore. High pressure will then build into our region from the west on Monday night, allowing winds and seas to diminish below Caution levels. High pressure will then strengthen over the Carolinas on Tuesday, resulting onshore winds. These onshore winds will slowly strengthen by midweek, but speeds and seas should remain below Caution levels. Rip Currents: Brisk southeasterly winds and a long period easterly ocean swell will result in a high-end moderate risk for dangerous rip currents at all area beaches today. A moderate risk is expected on Sunday as southerly winds develop a strong longshore current. && .Climate... An unseasonably humid air mass resulted in record warm minimum temperatures and record-tying daily dewpoint temperatures at several of our designated climate sites overnight and this morning. Low temperatures thus far for April 13th have only fallen to 72 degrees at St. Simons Island, which would smash the prior daily record warm minimum temperature for the date of 69 degrees, set on this date in 1994. Lows only fell to 71 degrees at Gainesville and Jacksonville, which would also establish records for April 13th. Dewpoint temperatures reached 72 degrees this morning at Jacksonville and Gainesville, which tied daily records at both locations that were previously established on this date in 2015. && .PRELIMINARY POINT TEMPS/POPS... AMG 68 86 56 74 / 40 60 20 0 SSI 70 84 60 76 / 10 40 40 0 JAX 70 88 59 80 / 20 50 30 0 SGJ 71 89 61 79 / 10 50 40 10 GNV 70 88 58 78 / 30 40 40 0 OCF 69 89 60 80 / 30 40 40 10 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...None. GA...None. AM...None. && Nelson/23/Corless
The national radar mosaic for the moment the first event began.
1 rip current. Local standard time, as filed.
Three swimmers were rescued from rip currents by Fernandina Beach Ocean Rescue at Peter's Point. One swell was rescued about 300 yards away from the shoreline.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Florida in 2019Every state in 2019This day in weather historyWarnings in Florida, April 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: 813628.