Alert archive / Florida / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 179, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Jul 29, 2018, 4:06 PM EDT for Duval County, Nassau County, Florida. It was in force for 24 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 29, 2018, 4:06 PM EDT (20:06 UTC)
- Expired
- Jul 29, 2018, 4:30 PM EDT
- In force
- 24 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 20:06 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 12:00Z, 8.1 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
- 704 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 888 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 2:52 PM EDT | River Flood Warning | JAX | Baker, Nassau | 5 days |
| Jul 29, 3:29 PM EDT | Areal Flood Advisory | JAX | Nassau | 91 min |
| Jul 29, 3:32 PM EDT | Special Weather Statement | JAX | Nassau | 43 min |
| Jul 29, 4:29 PM EDT | Special Weather Statement | JAX | Duval | 46 min |
| Jul 29, 4:32 PM EDT | Special Weather Statement | JAX | Putnam | 43 min |
| Jul 29, 4:48 PM EDT | Special Weather Statement | JAX | Union | 42 min |
| Jul 29, 5:00 PM EDT | Special Weather Statement | JAX | Clay | 45 min |
| Jul 29, 5:10 PM EDT | Areal Flood Advisory | JAX | Putnam | 65 min |
| Jul 29, 5:21 PM EDT | Special Weather Statement | JAX | Putnam | 24 min |
| Jul 29, 5:33 PM EDT | Special Weather Statement | JAX | Union | 42 min |
| Jul 29, 5:48 PM EDT | Special Weather Statement | JAX | Clay | 27 min |
| Jul 29, 5:57 PM EDT | Areal Flood Advisory | JAX | Clay | 63 min |
| Jul 29, 6:10 PM EDT | Areal Flood Advisory | JAX | Baker, Bradford, Clay, Duval, Union | 65 min |
| Jul 29, 6:50 PM EDT | Areal Flood Advisory | JAX | Clay, Duval, Saint Johns | 55 min |
| Jul 28, 8:23 PM EDT | Areal Flood Advisory | JAX | Bacon, Pierce, Ware | 97 min |
| Jul 28, 9:03 PM EDT | Areal Flood Advisory | JAX | Pierce, Wayne | 87 min |
| Jul 28, 10:06 PM EDT | Areal Flood Advisory | JAX | Wayne | 84 min |
| Jul 29, 1:16 PM EDT | Special Weather Statement | JAX | Glynn | 44 min |
| Jul 29, 1:50 PM EDT | Special Weather Statement | JAX | Camden | 40 min |
| Jul 29, 1:52 PM EDT | Special Weather Statement | JAX | Wayne | 38 min |
| Jul 29, 2:56 PM EDT | Special Weather Statement | JAX | Camden | 19 min |
| Jul 29, 3:39 PM EDT | Areal Flood Advisory | JAX | Ware | 96 min |
| Jul 29, 3:44 PM EDT | Areal Flood Advisory | JAX | Appling, Bacon, Coffee | 91 min |
| Jul 29, 4:12 PM EDT | Special Weather Statement | JAX | Jeff Davis | 48 min |
| Jul 29, 4:29 PM EDT | Areal Flood Advisory | JAX | Appling, Bacon, Jeff Davis | 61 min |
| Jul 29, 5:23 PM EDT | Areal Flood Advisory | JAX | Clinch | 67 min |
| Jul 29, 6:40 PM EDT | Special Weather Statement | JAX | Echols | 50 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2018Every severe thunderstorm warning in 2018
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.