Alert archive / Florida / Tornado Watches in 2019

Tornado Watch 87

April 19, 201927 counties in Florida; 14 counties in Georgia

The Storm Prediction Center issued this tornado watch at Apr 19, 2019, 10:13 AM EDT for 27 counties in Florida; 14 counties in Georgia. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 19, 2019, 10:13 AM EDT (14:13 UTC)
Expired
Apr 19, 2019, 4:00 PM EDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 41 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, DeSoto County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Hardee County, FL, Hernando County, FL, Hillsborough County, FL, Levy County, FL, Manatee County, FL, Marion County, FL, Nassau County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Putnam County, FL, Saint Johns County, FL, Sarasota County, FL, Sumter County, FL, Suwannee County, FL, Union County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Coffee County, GA, Echols County, GA, Glynn County, GA, Jeff Davis County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA

The radar

The Jacksonville radar (KJAX), 84 km from the middle of the area, began a volume at 14:15 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
10%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 19, 10:15 AM EDTSevere Thunderstorm WarningJAXColumbia, Hamilton45 min
Apr 19, 10:19 AM EDTSevere Thunderstorm WarningJAXColumbia, Gilchrist, Hamilton, Suwannee41 min
Apr 19, 10:35 AM EDTSevere Thunderstorm WarningJAXAppling, Bacon, Charlton, Clinch, Jeff Davis, Pierce and 1 more55 min
Apr 19, 10:36 AM EDTSevere Thunderstorm WarningTBWLevy39 min
Apr 19, 10:45 AM EDTSevere Thunderstorm WarningJAXAtkinson, Coffee16 min
Apr 19, 10:51 AM EDTTornado WarningJAXAppling, Jeff Davis24 min
Apr 19, 10:56 AM EDTTornado WarningJAXBaker, Columbia19 min
Apr 19, 11:00 AM EDTSevere Thunderstorm WarningJAXAlachua, Baker, Bradford, Columbia, Gilchrist, Union60 min
Apr 19, 11:12 AM EDTSevere Thunderstorm WarningJAXAppling, Brantley, Charlton, Pierce, Ware, Wayne48 min
Apr 19, 11:22 AM EDTSevere Thunderstorm WarningTBWLevy38 min
Apr 19, 11:33 AM EDTSevere Thunderstorm WarningJAXClay, Duval, Nassau, Saint Johns57 min
Apr 19, 11:42 AM EDTSevere Thunderstorm WarningTBWCitrus, Levy33 min
Apr 19, 11:49 AM EDTTornado WarningJAXNassau26 min
Apr 19, 11:54 AM EDTSevere Thunderstorm WarningJAXAlachua, Clay, Marion, Putnam66 min
Apr 19, 12:01 PM EDTSevere Thunderstorm WarningJAXBrantley, Charlton, Wayne29 min
Apr 19, 12:10 PM EDTTornado WarningJAXCamden, Glynn29 min
Apr 19, 12:12 PM EDTSevere Thunderstorm WarningTBWCitrus, Hernando, Pasco, Sumter33 min
Apr 19, 12:26 PM EDTSevere Thunderstorm WarningJAXClay, Duval, Nassau, Saint Johns49 min
Apr 19, 12:31 PM EDTSevere Thunderstorm WarningTBWHernando, Hillsborough, Pasco, Pinellas44 min
Apr 19, 12:45 PM EDTSevere Thunderstorm WarningJAXClay, Marion, Putnam, Saint Johns45 min
Apr 19, 12:50 PM EDTSevere Thunderstorm WarningTBWCitrus, Hernando, Sumter40 min
Apr 19, 1:18 PM EDTSevere Thunderstorm WarningTBWCitrus, Hernando, Hillsborough, Manatee, Pasco, Pinellas and 1 more72 min
Apr 19, 1:25 PM EDTSevere Thunderstorm WarningJAXFlagler, Marion, Putnam, Saint Johns65 min
Apr 19, 2:13 PM EDTSevere Thunderstorm WarningTBWHardee, Hillsborough, Manatee, Polk, Sarasota77 min
Apr 19, 2:27 PM EDTSevere Thunderstorm WarningJAXFlagler33 min
Apr 19, 3:29 PM EDTSevere Thunderstorm WarningTBWCharlotte, DeSoto, Hardee, Highlands, Manatee, Polk and 1 more61 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, 2.2 hours before the alert went out and 86 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 2019-04-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 822 joules per kilogram.LCLLFCEL10008507005003002001001 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 2019-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 303 square meters per square second.19395878Sfc1 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
822 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
632 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
303 m²/s²
0-3 km storm-relative helicity
279 m²/s²
Significant tornado parameter
1.3
Supercell composite
7.3

Open this sounding in Storm Lab

The text

As transmitted.

395 
WWUS20 KWNS 191411
SEL7  
SPC WW 191411
FLZ000-GAZ000-CWZ000-192000-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 87
NWS Storm Prediction Center Norman OK
1015 AM EDT Fri Apr 19 2019

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Parts of northern and west central Florida Peninsula
  Southeastern Georgia
  Coastal Waters

* Effective this Friday morning and afternoon from 1015 AM until
  400 PM EDT.

* Primary threats include...
  A couple tornadoes possible
  Scattered damaging wind gusts to 70 mph likely
  Isolated large hail events to 1 inch in diameter possible

SUMMARY...A broken squall line will likely persist into the
afternoon while moving eastward.  Bowing segments and embedded
supercells will pose a threat for a couple of tornadoes and damaging
gusts, along with isolated large hail.

The tornado watch area is approximately along and 50 statute miles
east and west of a line from 40 miles north northeast of Waycross GA
to 30 miles southwest of Sarasota FL. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU7).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.

&&

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1 inch. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 25040.

...Thompson

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 18, 9:54 PM EDTMesoscale DiscussionSPCCalhoun, Holmes, Jackson, Walton, Washington96 min
Apr 19, 12:44 AM EDTMesoscale DiscussionSPCEscambia, Holmes, Okaloosa, Santa Rosa, Walton, Washington2 hr
Apr 19, 1:33 AM EDTTornado WatchSPCBay, Calhoun, Dixie, Escambia, Franklin, Gadsden and 14 more9 hr
Apr 19, 3:42 AM EDTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 7 more2 hr
Apr 19, 6:28 AM EDTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 4 more2 hr
Apr 19, 9:09 AM EDTMesoscale DiscussionSPCColumbia, Dixie, Gadsden, Gilchrist, Hamilton, Jefferson and 6 more2 hr
Apr 19, 1:20 PM EDTMesoscale DiscussionSPCBrevard, Charlotte, Citrus, Clay, Collier, DeSoto and 25 more85 min
Apr 19, 1:36 PM EDTSevere Thunderstorm WatchSPCBrevard, Charlotte, Collier, DeSoto, Glades, Hardee and 16 more8 hr
Apr 19, 3:40 PM EDTMesoscale DiscussionSPCBrevard, Charlotte, DeSoto, Glades, Hardee, Hendry and 12 more95 min
Apr 19, 7:11 PM EDTMesoscale DiscussionSPCBroward, Martin, Miami-Dade, Monroe, Palm Beach, Saint Lucie94 min
Apr 18, 8:22 PM EDTSevere Thunderstorm WatchSPCBartow, Butts, Carroll, Chattahoochee, Chattooga, Cherokee and 34 more7 hr
Apr 18, 10:29 PM EDTMesoscale DiscussionSPCBartow, Carroll, Chattahoochee, Cobb, Coweta, Douglas and 10 more91 min
Apr 19, 10:06 AM EDTMesoscale DiscussionSPCBaldwin, Bibb, Bleckley, Columbia, Elbert, Glascock and 21 more84 min
Apr 19, 10:31 AM EDTTornado WatchSPCElbert, Hart9 hr
Apr 19, 10:44 AM EDTTornado WatchSPCBaldwin, Bryan, Bulloch, Burke, Candler, Chatham and 29 more5 hr
Apr 19, 1:19 PM EDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 22 more86 min

Nearby

Tornado Watches in Florida, 2019Tornado Watches in Georgia, 2019Every tornado watch 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.