Alert archive / Florida / Severe Thunderstorm Warnings in 2024
Severe Thunderstorm Warning 201, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Sep 18, 2024, 4:11 PM EDT for Saint Johns County, Florida. It was in force for 34 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 18, 2024, 4:11 PM EDT (20:11 UTC)
- Expired
- Sep 18, 2024, 4:45 PM EDT
- In force
- 34 min
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Saint Johns County, FL
The radar
The Jacksonville radar (KJAX), 70 km from the middle of the area, began a volume at 20:12 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
Cape Canaveral, FL (KXMR), launched 12:00Z, 8.2 hours before the alert went out and 183 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
- 1282 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 1019 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 31 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 |
|---|---|---|---|---|
| Sep 18, 1:57 AM EDT | Coastal Flood Advisory | JAX | Clay, Duval, Flagler, Nassau, Putnam | 9 days |
| Sep 18, 1:09 PM EDT | Special Weather Statement | JAX | Columbia | 36 min |
| Sep 18, 1:29 PM EDT | Special Weather Statement | JAX | Union | 31 min |
| Sep 18, 1:41 PM EDT | Special Weather Statement | JAX | Columbia | 34 min |
| Sep 18, 2:46 PM EDT | Special Weather Statement | JAX | Clay | 44 min |
| Sep 18, 3:24 PM EDT | Special Weather Statement | JAX | Saint Johns | 51 min |
| Sep 18, 3:45 PM EDT | Special Weather Statement | JAX | Duval | 30 min |
| Sep 18, 3:54 PM EDT | Special Weather Statement | JAX | Duval | 36 min |
| Sep 18, 3:57 PM EDT | Special Marine Warning | JAX | 63 min | |
| Sep 18, 4:14 PM EDT | Special Weather Statement | JAX | Duval | 31 min |
| Sep 18, 4:26 PM EDT | Special Weather Statement | JAX | Duval | 34 min |
| Sep 18, 4:39 PM EDT | Special Weather Statement | JAX | Flagler | 36 min |
| Sep 18, 4:43 PM EDT | Special Marine Warning | JAX | 62 min | |
| Sep 18, 4:46 PM EDT | Severe Thunderstorm Warning | JAX | Flagler, Saint Johns | 44 min |
| Sep 18, 4:47 PM EDT | Special Marine Warning | JAX | 58 min | |
| Sep 18, 4:55 PM EDT | Special Marine Warning | JAX | 65 min | |
| Sep 18, 4:59 PM EDT | Special Weather Statement | JAX | Nassau | 31 min |
| Sep 18, 5:13 PM EDT | Special Weather Statement | JAX | Flagler | 32 min |
| Sep 18, 5:25 PM EDT | Severe Thunderstorm Warning | JAX | Flagler | 35 min |
| Sep 18, 5:37 PM EDT | Special Marine Warning | JAX | 53 min | |
| Sep 18, 5:50 PM EDT | Special Weather Statement | JAX | Flagler | 25 min |
| Sep 18, 6:30 PM EDT | Special Marine Warning | JAX | 60 min | |
| Sep 18, 9:44 AM EDT | Special Weather Statement | JAX | Ware | 31 min |
| Sep 18, 10:12 AM EDT | Special Weather Statement | JAX | Brantley | 33 min |
| Sep 18, 5:22 PM EDT | Special Weather Statement | JAX | Camden | 23 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2024Every severe thunderstorm warning in 2024
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.