Alert archive / Florida / Tornado Watches in 2020

Tornado Watch 143

April 23, 202013 counties in Florida; 5 counties in Georgia

The Storm Prediction Center issued this tornado watch at Apr 23, 2020, 6:52 PM EDT for 13 counties in Florida; 5 counties in Georgia. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 23, 2020, 6:52 PM EDT (22:52 UTC)
Expired
Apr 24, 2020, 12:00 AM EDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt

Counties Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Gilchrist County, FL, Hamilton County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Union County, FL, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Ware County, GA

The radar

The Jacksonville radar (KJAX), 58 km from the middle of the area, began a volume at 22:53 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
10%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 23, 7:36 PM EDTSevere Thunderstorm WarningJAXColumbia, Hamilton, Suwannee54 min
Apr 23, 8:26 PM EDTSevere Thunderstorm WarningJAXBaker, Columbia, Hamilton, Suwannee64 min
Apr 23, 8:50 PM EDTTornado WarningJAXAlachua, Columbia, Gilchrist, Suwannee40 min
Apr 23, 8:56 PM EDTTornado WarningJAXColumbia, Suwannee34 min
Apr 23, 9:07 PM EDTTornado WarningJAXGilchrist38 min
Apr 23, 9:23 PM EDTTornado WarningJAXAlachua, Baker, Bradford, Columbia, Union52 min
Apr 23, 9:34 PM EDTTornado WarningJAXAlachua, Bradford, Columbia, Gilchrist41 min
Apr 23, 10:09 PM EDTTornado WarningJAXAlachua, Bradford, Clay, Union36 min
Apr 23, 10:11 PM EDTSevere Thunderstorm WarningJAXBaker, Bradford, Clay, Duval, Nassau, Union22 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, 10.9 hours before the alert went out and 58 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.

Skew-T log-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2020-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2020-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 108 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1362 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
108 m²/s²
0-3 km storm-relative helicity
225 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 23, 3:28 AM EDTMesoscale DiscussionSPCEscambia, Santa Rosa92 min
Apr 23, 5:05 AM EDTTornado WatchSPCBay, Calhoun, Escambia, Holmes, Jackson, Okaloosa and 3 more11 hr
Apr 23, 8:43 AM EDTMesoscale DiscussionSPCBay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 10 more92 min
Apr 23, 10:29 AM EDTMesoscale DiscussionSPCBaker, Columbia, Gadsden, Hamilton, Jackson, Jefferson and 5 more61 min
Apr 23, 10:52 AM EDTTornado WatchSPCFranklin, Gadsden, Gulf, Hamilton, Jefferson, Leon and 4 more6 hr
Apr 23, 1:05 PM EDTMesoscale DiscussionSPCBay, Escambia, Okaloosa, Santa Rosa, Walton, Washington55 min
Apr 23, 3:28 PM EDTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gulf, Jefferson, Leon and 6 more62 min
Apr 23, 3:47 PM EDTTornado WatchSPCBay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 11 more6 hr
Apr 23, 6:09 PM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Calhoun, Clay, Columbia and 17 more96 min
Apr 23, 1:25 PM EDTMesoscale DiscussionSPCAtkinson, Brantley, Clinch, Echols, Lanier, Lowndes and 3 more95 min
Apr 23, 2:22 PM EDTMesoscale DiscussionSPCChatham, Effingham, Screven83 min

Nearby

Tornado Watches in Florida, 2020Tornado Watches in Georgia, 2020Every tornado watch in 2020

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.