Alert archive / Florida / Mesoscale Discussions in 2019
Mesoscale Discussion 404
The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2019, 1:20 PM EDT for 31 counties in Florida. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Apr 19, 2019, 1:20 PM EDT (17:20 UTC)
- Expired
- Apr 19, 2019, 2:45 PM EDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 31 counties
Brevard County, FL, Charlotte County, FL, Citrus County, FL, Clay County, FL, Collier County, FL, DeSoto County, FL, Flagler County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Lee County, FL, Manatee County, FL, Marion County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Putnam County, FL, Saint Johns County, FL, Saint Lucie County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL
The radar
The Tampa radar (KTBW), 74 km from the middle of the area, began a volume at 17:24 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Tampa Bay, FL (KTBW), launched 12:00Z, 5.3 hours before the alert went out and 74 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
- 1105 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 838 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 253 m²/s²
- 0-3 km storm-relative helicity
- 268 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 10.7
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 9:54 PM EDT | Mesoscale Discussion | SPC | Calhoun, Holmes, Jackson, Walton, Washington | 96 min |
| Apr 19, 12:44 AM EDT | Mesoscale Discussion | SPC | Escambia, Holmes, Okaloosa, Santa Rosa, Walton, Washington | 2 hr |
| Apr 19, 1:33 AM EDT | Tornado Watch | SPC | Bay, Calhoun, Dixie, Escambia, Franklin, Gadsden and 14 more | 9 hr |
| Apr 19, 3:42 AM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 7 more | 2 hr |
| Apr 19, 6:28 AM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 4 more | 2 hr |
| Apr 19, 9:09 AM EDT | Mesoscale Discussion | SPC | Columbia, Dixie, Gadsden, Gilchrist, Hamilton, Jefferson and 6 more | 2 hr |
| Apr 19, 10:13 AM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 21 more | 6 hr |
| Apr 19, 1:36 PM EDT | Severe Thunderstorm Watch | SPC | Brevard, Charlotte, Collier, DeSoto, Glades, Hardee and 16 more | 8 hr |
| Apr 19, 3:40 PM EDT | Mesoscale Discussion | SPC | Brevard, Charlotte, DeSoto, Glades, Hardee, Hendry and 12 more | 95 min |
| Apr 19, 7:11 PM EDT | Mesoscale Discussion | SPC | Broward, Martin, Miami-Dade, Monroe, Palm Beach, Saint Lucie | 94 min |
Nearby
Mesoscale Discussions in Florida, 2019Every mesoscale discussion in 2019
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.