Alert archive / Florida / Severe Thunderstorm Warnings in 2016
Severe Thunderstorm Warning 171, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Sep 13, 2016, 10:15 PM EDT for Duval County, Nassau County, Florida. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 13, 2016, 10:15 PM EDT (02:15 UTC)
- Expired
- Sep 13, 2016, 11:00 PM EDT
- In force
- 45 min
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Duval County, FL, Nassau County, FL
The radar
The Jacksonville radar (KJAX), 1 km from the middle of the area, began a volume at 02:16 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Jacksonville, FL (KJAX), launched 00:00Z, 2.3 hours before the alert went out and 3 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 603 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 584 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -61 m²/s²
- 0-3 km storm-relative helicity
- -39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Sep 13, 9:07 PM EDT, 1 hour 8 minutes earlier.
Area forecast discussion, Sep 13, 9:07 PM EDT, 1 hour 8 minutes before
Area Forecast Discussion
National Weather Service Jacksonville FL
907 PM EDT TUE SEP 13 2016
...Strong winds and heavy rainfall will continue to impact the
coast from Jacksonville to Brunswick tonight...
.UPDATE...
Tropical disturbance/low continues to track northward through
coastal NE FL with latest position just W of St Augustine.
Sustained winds of 25 to 35 mph with gusts to 40 to 45 mph still
possible along the coast and will keep wind advisory in place.
Rain bands on the NE side of this system continue to slowly move
up the coast and are the focus of heavy rainfall and gusty winds
and have placed Flood Watch across portions of coastal SE GA due
to the heavy rainfall they have already received ahead of this
band, while more localized temporary flooding expected across the
JAX metro area the next few hours. Much further inland, not
expecting much in the way of impacts with just a few isolated
showers and abundant cloud cover. Weak rotation noted in rain
bands as they move northward along the coast and an isolated
tornado cannot be ruled out overnight. With Tropical Low expected
to be over coastal SE GA Wed Morning expect conditions to continue
there before improving by the afternoon, while NE FL will see
improving conditions late tonight then enough moisture to keep at
least a chance of showers and storms through the afternoon.
&&
.AVIATION...
Strong winds and IFR/MVFR cigs/vsbys will impact the coastal TAFs
tonight with lower impacts at KGNV, although low cigs will be
possible there towards morning.
&&
.MARINE...
Gale Warnings will continue with sustained winds generally in the
25 to 35 knot range with gusts to 45 knots on the east side of the
tropical low as it moves northward. Seas 6 to 8 feet still
expected to build to 7 to 10 feet. Diminishing trends expected on
Wed as low pulls slowly away from the region.
High Surf/Rip Currents: breaker reports up to 6 ft and rising as
of sunset and will keep high surf advisory in place along with the
high risk of rip currents.
&&
.HYDROLOGY...
Additional 3 to 6 inch rainfall amounts will mainly be along the
coast from jacksonville northward to brunswick and with previous
heavy rainfall earlier today across portions of coastal SE GA have
posted flood watch through Wed afternoon.
&&
.PRELIMINARY POINT TEMPS/POPS...
AMG 73 83 72 87 / 70 80 50 70
SSI 77 82 75 85 / 80 80 60 70
JAX 74 86 74 88 / 80 70 40 70
SGJ 76 84 76 86 / 80 60 50 70
GNV 74 88 74 88 / 60 60 30 70
OCF 74 88 73 88 / 40 60 30 70
&&
.JAX Watches/Warnings/Advisories...
FL...High Rip Current Risk through Wednesday evening for Coastal
Duval-Coastal Nassau-Flagler-St. Johns.
Wind Advisory until 10 AM EDT Wednesday for Coastal Duval-
Coastal Nassau-Flagler-St. Johns.
High Surf Advisory until 10 AM EDT Wednesday for Coastal Duval-
Coastal Nassau-Flagler-St. Johns.
GA...Flood Watch through Wednesday afternoon for Brantley-Coastal
Camden-Coastal Glynn-Inland Camden-Inland Glynn-Wayne.
High Rip Current Risk through Wednesday evening for Coastal
Camden-Coastal Glynn.
Wind Advisory until 10 AM EDT Wednesday for Coastal Camden-
Coastal Glynn.
High Surf Advisory until 10 AM EDT Wednesday for Coastal Camden-
Coastal Glynn.
AM...Gale Warning until 5 AM EDT Wednesday for Coastal waters from
Altamaha Sound to Fernandina Beach FL out 20 NM-Coastal
waters from Fernandina Beach to St. Augustine FL out 20 NM-
Coastal waters from St. Augustine to Flagler Beach FL out
20 NM-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.
&&
Hess/Enyedi/Guillet/SandrikHazardous weather outlook, Sep 13, 7:45 PM EDT, 2 hours 30 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE JACKSONVILLE FL 745 PM EDT TUE SEP 13 2016 AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125- GAZ132>136-149>154-162>166-141130- COASTAL WATERS FROM ALTAMAHA SOUND TO FERNANDINA BEACH FL OUT 20 NM- COASTAL WATERS FROM FERNANDINA BEACH TO ST. AUGUSTINE FL OUT 20 NM- COASTAL WATERS FROM ST. AUGUSTINE TO FLAGLER BEACH FL OUT 20 NM- 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- HAMILTON-SUWANNEE-COLUMBIA-BAKER-INLAND NASSAU-INLAND DUVAL-UNION- BRADFORD-CLAY-ST. JOHNS-GILCHRIST-ALACHUA-PUTNAM-FLAGLER-MARION- COASTAL NASSAU-COASTAL DUVAL-COFFEE-JEFF DAVIS-BACON-APPLING- WAYNE-ATKINSON-WARE-PIERCE-BRANTLEY-INLAND GLYNN-COASTAL GLYNN- ECHOLS-CLINCH-CHARLTON-INLAND CAMDEN-COASTAL CAMDEN- 745 PM EDT TUE SEP 13 2016 ...LOCALLY HEAVY RAIN ESPECIALLY NEAR THE COAST... ...FLOOD WATCH IN EFFECT FOR COASTAL SOUTHEAST GEORGIA... ...HIGH RISK OF RIP CURRENTS AND HIGH SURF ADVISORY... ...WIND ADVISORY ALONG COASTAL AREAS TONIGHT... ...GALE WARNING IN EFFECT FOR THE COASTAL WATERS... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST FLORIDA... SOUTHEAST GEORGIA AND THE ADJACENT COASTAL WATERS. .DAY ONE...TONIGHT... A TROPICAL LOW WILL TRACK ACROSS THE NORTH FLORIDA PENINSULA THROUGH TONIGHT AND BE ACROSS THE SOUTHEAST GEORGIA TONIGHT. RAIN BANDS WILL ROTATE TO THE WEST AND NORTHWEST THE REGION THROUGH TONIGHT. A FEW STRONG STORMS ARE POSSIBLE WITH THESE BANDS WHICH MAY ALSO PRODUCE BRIEF WATER SPOUTS AND TORNADOES. INTENSE RAINFALL RATES ARE EXPECTED INTO TONIGHT WITH RAINFALL AMOUNTS OF 3 TO 6 INCHES POSSIBLE ALONG THE COAST WITH LESSER AMOUNTS INLAND. HEAVY RAIN IN A SHORT PERIOD OF TIME MAY LEAD TO TEMPORARY FLOODING OF URBAN AREAS AS WELL AS LOW LYING AND POOR DRAINAGE AREAS. FLOOD WATCH IS IN EFFECT FOR COASTAL SOUTHEAST GEORGIA. ALONG THE IMMEDIATE COASTAL AREAS...WINDY CONDITIONS ARE EXPECTED. SUSTAINED WINDS AROUND 25 TO 35 MPH WITH GUSTS AROUND 45 MPH ARE EXPECTED. LOCALLY HIGHER GUSTS POSSIBLE IN SOME OF THE HEAVIER RAIN BANDS. THE RISK FOR RIP CURRENTS WILL BE HIGH INTO WEDNESDAY DUE TO THE STRONG ONSHORE FLOW AND BUILDING SEAS WITH BREAKERS BECOMING UP TO 5 TO 8 FEET. A GALE WARNING IS IN EFFECT FOR THE COASTAL WATERS THROUGH WEDNESDAY MORNING. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY... NUMEROUS TO WIDESPREAD SHOWERS WITH SCATTERED STORMS ARE EXPECTED ON WEDNESDAY WITH LOCALLY HEAVIER AMOUNTS OF OVER 2 INCHES POSSIBLE. SCATTERED TO NUMEROUS SHOWERS AND STORMS ARE EXPECTED EACH AFTERNOON AND EVENING FOR THE REMAINDER OF THE PERIOD WITH LOCALLY HEAVY RAIN AND FREQUENT LIGHTNING POSSIBLE IN THE STRONGER STORMS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED. HOWEVER, INDIVIDUAL SPOTTERS ARE ENCOURAGED TO REPORT HIGH WIND AND FLOODING TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE. FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE IN JACKSONVILLE WEBSITE ON THE INTERNET AT WEATHER.GOV/JAX.
In the hours before
Local storm report, Sep 13, 9:56 PM EDT, 19 minutes before
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</html>The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 8:07 PM EDT | Special Weather Statement | JAX | Duval | 38 min |
| Sep 13, 8:21 PM EDT | Special Weather Statement | JAX | Nassau | 54 min |
| Sep 13, 8:36 PM EDT | Special Weather Statement | JAX | Duval | 54 min |
| Sep 13, 8:43 PM EDT | Areal Flood Advisory | JAX | Duval, Saint Johns | 3 hr |
| Sep 13, 9:23 PM EDT | Special Weather Statement | JAX | Duval | 67 min |
| Sep 13, 9:29 PM EDT | Areal Flood Warning | JAX | Duval, Saint Johns | 3 hr |
| Sep 13, 9:29 PM EDT | Severe Thunderstorm Warning | JAX | Duval | 46 min |
| Sep 13, 10:05 PM EDT | Special Weather Statement | JAX | Duval | 55 min |
| Sep 13, 10:34 PM EDT | Small Craft Advisory | JAX | 10 hr | |
| Sep 13, 10:34 PM EDT | Tropical Storm Warning | JAX | Duval, Nassau | 12 hr |
| Sep 14, 2:50 AM EDT | Special Marine Warning | JAX | 55 min | |
| Sep 14, 4:04 AM EDT | Special Marine Warning | JAX | 56 min | |
| Sep 14, 5:01 AM EDT | Special Marine Warning | JAX | 29 min | |
| Sep 14, 6:54 AM EDT | Rip Current Statement | JAX | Duval, Flagler, Nassau | 11 hr |
| Sep 14, 8:31 AM EDT | Small Craft Advisory | JAX | 10 hr | |
| Sep 14, 12:26 PM EDT | Special Weather Statement | JAX | Marion | 49 min |
| Sep 14, 1:07 PM EDT | Special Weather Statement | JAX | Saint Johns | 38 min |
| Sep 13, 8:18 PM EDT | Areal Flood Warning | JAX | Glynn | 3 hr |
| Sep 13, 8:27 PM EDT | Special Weather Statement | JAX | Brantley, Glynn | 63 min |
| Sep 13, 9:08 PM EDT | Areal Flood Warning | JAX | Glynn | 2 hr |
| Sep 14, 1:59 AM EDT | Areal Flood Advisory | JAX | Camden, Glynn | 2 hr |
| Sep 14, 4:08 AM EDT | Areal Flood Advisory | JAX | Glynn | 97 min |
| Sep 14, 5:09 AM EDT | Areal Flood Warning | JAX | Glynn | 96 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2016Every severe thunderstorm warning in 2016
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.