Alert archive / Florida / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 54
The Storm Prediction Center issued this severe thunderstorm watch at Apr 8, 2004, 10:45 AM EDT for 17 counties in Florida. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 8, 2004, 10:45 AM EDT (14:45 UTC)
- Expired
- Apr 8, 2004, 5:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
Counties Alachua County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Flagler County, FL, Gilchrist County, FL, Hernando County, FL, Lafayette County, FL, Lake County, FL, Levy County, FL, Marion County, FL, Orange County, FL, Putnam County, FL, Saint Johns County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL
The radar
The Jacksonville radar (KJAX), 123 km from the middle of the area, began a volume at 14:47 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.
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 10:45 AM EDT | Severe Thunderstorm Warning | JAX | Clay | 45 min |
| Apr 8, 11:00 AM EDT | Severe Thunderstorm Warning | JAX | Marion | 60 min |
| Apr 8, 11:07 AM EDT | Severe Thunderstorm Warning | JAX | Saint Johns | 38 min |
| Apr 8, 12:51 PM EDT | Severe Thunderstorm Warning | MLB | Volusia | 39 min |
| Apr 8, 1:21 PM EDT | Severe Thunderstorm Warning | JAX | Duval, Saint Johns | 39 min |
| Apr 8, 1:41 PM EDT | Severe Thunderstorm Warning | MLB | Volusia | 44 min |
| Apr 8, 1:46 PM EDT | Severe Thunderstorm Warning | MLB | Seminole | 44 min |
| Apr 8, 2:37 PM EDT | Severe Thunderstorm Warning | MLB | Orange | 53 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Jacksonville, FL (KJAX), launched 12:00Z, 2.8 hours before the alert went out and 124 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
- 406 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 468 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 117 m²/s²
- 0-3 km storm-relative helicity
- 216 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 9:50 AM EDT | Mesoscale Discussion | SPC | Calhoun, Gadsden, Holmes, Jackson, Jefferson, Leon and 5 more | 85 min |
| Apr 8, 10:10 AM EDT | Severe Thunderstorm Watch | SPC | Escambia, Gadsden, Hamilton, Holmes, Jackson, Leon and 5 more | 7 hr |
| Apr 8, 10:16 AM EDT | Mesoscale Discussion | SPC | Alachua, Bradford, Citrus, Clay, Duval, Flagler and 13 more | 119 min |
| Apr 8, 12:42 PM EDT | Mesoscale Discussion | SPC | Alachua, Bradford, Citrus, Clay, Flagler, Gilchrist and 11 more | 2 hr |
| Apr 8, 1:11 PM EDT | Mesoscale Discussion | SPC | Escambia, Gadsden, Hamilton, Holmes, Jackson, Leon and 5 more | 2 hr |
| Apr 8, 3:35 PM EDT | Mesoscale Discussion | SPC | Brevard, Hardee, Highlands, Hillsborough, Indian River, Okeechobee and 6 more | 55 min |
| Apr 8, 3:40 PM EDT | Mesoscale Discussion | SPC | Nassau | 65 min |
Nearby
Severe Thunderstorm Watches in Florida, 2004Every severe thunderstorm watch in 2004
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.