Alert archive / Florida / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 221, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 17, 2017, 3:38 PM EDT for Duval County, Nassau County, Florida. It was in force for 52 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
- Jul 17, 2017, 3:38 PM EDT (19:38 UTC)
- Expired
- Jul 17, 2017, 4:30 PM EDT
- In force
- 52 min
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
- Tornado
- Possible
- 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 19:42 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
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 7.6 hours before the alert went out and 248 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
- 1444 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 757 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 27 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 Jul 17, 3:28 PM EDT, 10 minutes earlier.
Area forecast discussion, Jul 17, 3:28 PM EDT, 10 minutes before
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</html>Hazardous weather outlook, Jul 17, 3:39 AM EDT, 11 hours 59 minutes before
Hazardous Weather Outlook National Weather Service Jacksonville FL 339 AM EDT Mon Jul 17 2017 AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125- GAZ132>136-149>154-162>166-181015- 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- 339 AM EDT Mon Jul 17 2017 This Hazardous Weather Outlook is for Northeast Florida, Southeast Georgia and the Adjacent Coastal Waters. .DAY ONE...Today and Tonight... Scattered to numerous thunderstorms are expected to develop this afternoon and evening. Frequent lighting, heavy rainfall and localized flooding are the primary hazards. A few storms could produce strong wind gusts. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday... Scattered to numerous thunderstorms are expected Tuesday and Wednesday. Storm coverage will decrease and become more scattered across the area Thursday through Sunday. Hot temperatures are expected Thursday through Sunday with highs reaching the mid to upper 90s inland. Afternoon heat indices will be in the 104 to 109 degree range. .SPOTTER INFORMATION STATEMENT... Spotters are asked to self activate this afternoon if warnings are issued. For additional information, visit the National Weather Service in Jacksonville website on the internet at weather.gov/jax.
In the hours before
Special weather statement, Jul 17, 2:57 PM EDT, 41 minutes before
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</html>Local storm report, Jul 17, 3:10 PM EDT, 28 minutes before
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</html>Special weather statement, Jul 17, 3:31 PM EDT, 7 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 |
|---|---|---|---|---|
| Jul 17, 12:26 PM EDT | Special Weather Statement | JAX | Columbia | 34 min |
| Jul 17, 1:13 PM EDT | Special Weather Statement | JAX | Columbia | 32 min |
| Jul 17, 1:39 PM EDT | Special Weather Statement | JAX | Duval | 36 min |
| Jul 17, 1:59 PM EDT | Special Weather Statement | JAX | Saint Johns | 46 min |
| Jul 17, 2:03 PM EDT | Special Weather Statement | JAX | Saint Johns | 42 min |
| Jul 17, 2:05 PM EDT | Special Weather Statement | JAX | Alachua | 40 min |
| Jul 17, 2:18 PM EDT | Severe Thunderstorm Warning | JAX | Alachua, Bradford | 42 min |
| Jul 17, 2:28 PM EDT | Severe Thunderstorm Warning | JAX | Saint Johns | 30 min |
| Jul 17, 2:30 PM EDT | Special Weather Statement | JAX | Marion | 45 min |
| Jul 17, 2:39 PM EDT | Special Weather Statement | JAX | Putnam | 51 min |
| Jul 17, 2:44 PM EDT | Areal Flood Advisory | JAX | Alachua | 91 min |
| Jul 17, 2:46 PM EDT | Special Weather Statement | JAX | Bradford, Clay | 44 min |
| Jul 17, 2:54 PM EDT | Areal Flood Advisory | JAX | Putnam | 96 min |
| Jul 17, 2:57 PM EDT | Special Weather Statement | JAX | Duval | 48 min |
| Jul 17, 2:59 PM EDT | Special Weather Statement | JAX | Saint Johns | 46 min |
| Jul 17, 3:04 PM EDT | Special Weather Statement | JAX | Marion | 41 min |
| Jul 17, 3:18 PM EDT | Severe Thunderstorm Warning | JAX | Flagler, Saint Johns | 27 min |
| Jul 17, 3:24 PM EDT | Severe Thunderstorm Warning | JAX | Clay, Duval | 36 min |
| Jul 17, 3:27 PM EDT | Special Marine Warning | JAX | 63 min | |
| Jul 17, 3:31 PM EDT | Special Weather Statement | JAX | Nassau | 44 min |
| Jul 17, 3:40 PM EDT | Areal Flood Advisory | JAX | Clay, Duval | 95 min |
| Jul 17, 3:45 PM EDT | Severe Thunderstorm Warning | JAX | Flagler | 17 min |
| Jul 17, 3:49 PM EDT | Special Weather Statement | JAX | Putnam | 41 min |
| Jul 17, 3:57 PM EDT | Areal Flood Advisory | JAX | Duval, Nassau | 93 min |
| Jul 17, 4:01 PM EDT | Special Weather Statement | JAX | Nassau | 44 min |
| Jul 17, 4:06 PM EDT | Severe Thunderstorm Warning | JAX | Nassau | 39 min |
| Jul 17, 4:10 PM EDT | Special Weather Statement | JAX | Flagler | 50 min |
| Jul 17, 4:38 PM EDT | Special Weather Statement | JAX | Flagler | 52 min |
| Jul 17, 4:42 PM EDT | Special Marine Warning | JAX | 63 min | |
| Jul 17, 4:51 PM EDT | Severe Thunderstorm Warning | JAX | Flagler | 39 min |
| Jul 17, 1:44 PM EDT | Special Weather Statement | JAX | Atkinson | 46 min |
| Jul 17, 2:11 PM EDT | Special Weather Statement | JAX | Clinch | 49 min |
| Jul 17, 2:44 PM EDT | Special Weather Statement | JAX | Charlton, Ware | 46 min |
| Jul 17, 3:10 PM EDT | Special Weather Statement | JAX | Brantley, Pierce | 50 min |
| Jul 17, 3:54 PM EDT | Special Weather Statement | JAX | Brantley, Wayne | 51 min |
| Jul 17, 4:40 PM EDT | Special Weather Statement | JAX | Glynn | 50 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2017Every severe thunderstorm warning in 2017
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.