Alert archive / Florida / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 198, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 16, 2018, 4:45 PM EDT for Gilchrist County, Suwannee County, Florida. It was in force for 21 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
- Aug 16, 2018, 4:45 PM EDT (20:45 UTC)
- Expired
- Aug 16, 2018, 5:06 PM EDT
- In force
- 21 min
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Gilchrist County, FL, Suwannee County, FL
The radar
The Moody AFB radar (KVAX), 104 km from the middle of the area, began a volume at 20:48 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, 8.8 hours before the alert went out and 144 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
- 1729 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 549 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 7 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 Aug 16, 3:12 PM EDT, 1 hour 33 minutes earlier.
Area forecast discussion, Aug 16, 3:12 PM EDT, 1 hour 33 minutes before
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Special weather statement, Aug 16, 3:37 PM EDT, 1 hour 8 minutes before
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</html>Special weather statement, Aug 16, 4:11 PM EDT, 34 minutes before
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</html>Special weather statement, Aug 16, 4:17 PM EDT, 28 minutes before
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</html>Special weather statement, Aug 16, 4:34 PM EDT, 11 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 |
|---|---|---|---|---|
| Aug 15, 8:23 PM EDT | Special Weather Statement | JAX | Flagler | 52 min |
| Aug 16, 2:15 PM EDT | Areal Flood Advisory | JAX | Clay | 90 min |
| Aug 16, 3:37 PM EDT | Special Weather Statement | JAX | Gilchrist | 23 min |
| Aug 16, 4:11 PM EDT | Special Weather Statement | JAX | Alachua | 34 min |
| Aug 16, 4:15 PM EDT | Areal Flood Advisory | JAX | Duval | 90 min |
| Aug 16, 4:28 PM EDT | Areal Flood Advisory | JAX | Columbia, Gilchrist | 2 hr |
| Aug 16, 4:34 PM EDT | Special Weather Statement | JAX | Bradford | 26 min |
| Aug 16, 4:43 PM EDT | Severe Thunderstorm Warning | JAX | Alachua, Putnam | 47 min |
| Aug 16, 5:00 PM EDT | Special Weather Statement | JAX | Bradford | 30 min |
| Aug 16, 5:07 PM EDT | Special Weather Statement | JAX | Suwannee | 38 min |
| Aug 16, 5:18 PM EDT | Areal Flood Advisory | JAX | Alachua | 87 min |
| Aug 16, 5:21 PM EDT | Special Weather Statement | JAX | Bradford, Union | 24 min |
| Aug 16, 5:30 PM EDT | Special Weather Statement | JAX | Nassau | 30 min |
| Aug 16, 5:45 PM EDT | Special Weather Statement | JAX | Bradford, Union | 30 min |
| Aug 16, 5:53 PM EDT | Areal Flood Advisory | JAX | Bradford | 97 min |
| Aug 16, 6:10 PM EDT | Special Weather Statement | JAX | Clay, Putnam | 35 min |
| Aug 16, 6:30 PM EDT | Special Weather Statement | JAX | Baker | 30 min |
| Aug 16, 6:46 PM EDT | Areal Flood Advisory | JAX | Putnam | 89 min |
| Aug 16, 6:49 PM EDT | Special Weather Statement | JAX | Putnam | 26 min |
| Aug 16, 4:17 PM EDT | Special Weather Statement | JAX | Glynn | 28 min |
| Aug 16, 6:35 PM EDT | Special Weather Statement | JAX | Clinch, Echols | 25 min |
| Aug 16, 7:04 PM EDT | Special Weather Statement | JAX | Charlton | 26 min |
| Aug 16, 7:33 PM EDT | Special Weather Statement | JAX | Pierce | 27 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.