Alert archive / Florida / Tornado Watches in 2016

Tornado Watch 76

April 1, 201627 counties in Florida; 15 counties in Georgia

The Storm Prediction Center issued this tornado watch at Apr 1, 2016, 9:02 PM EDT for 27 counties in Florida; 15 counties in Georgia. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
Apr 1, 2016, 9:02 PM EDT (01:02 UTC)
Expired
Apr 2, 2016, 6:00 AM EDT
In force
9 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
60 kt
All 42 counties

Alachua County, FL, Baker County, FL, Bay County, FL, Bradford County, FL, Calhoun County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Franklin County, FL, Gadsden County, FL, Gilchrist County, FL, Gulf County, FL, Hamilton County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Nassau County, FL, Saint Johns County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL, Washington County, FL, Brantley County, GA, Brooks County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Decatur County, GA, Echols County, GA, Glynn County, GA, Grady County, GA, Lanier County, GA, Lowndes County, GA, Pierce County, GA, Seminole County, GA, Thomas County, GA, Ware County, GA

The radar

The Tallahassee radar (KTLH), 20 km from the middle of the area, began a volume at 01:05 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
30%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
10%
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
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 1, 10:14 PM EDTSevere Thunderstorm WarningTAEBay46 min
Apr 1, 10:48 PM EDTSevere Thunderstorm WarningTAEFranklin, Gulf35 min
Apr 2, 2:23 AM EDTSevere Thunderstorm WarningJAXSuwannee52 min
Apr 2, 3:25 AM EDTSevere Thunderstorm WarningJAXColumbia, Hamilton, Suwannee35 min
Apr 2, 3:42 AM EDTTornado WarningJAXHamilton, Suwannee33 min
Apr 2, 3:57 AM EDTSevere Thunderstorm WarningJAXColumbia, Hamilton, Suwannee63 min
Apr 2, 4:54 AM EDTSevere Thunderstorm WarningTAEDixie, Taylor36 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 00:00Z, 1.0 hours before the alert went out and 233 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 00:00Z on 2016-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1190 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 00:00Z on 2016-04-02The 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
1190 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
1066 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
108 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
0.8
Supercell composite
3.5

Open this sounding in Storm Lab

The text

As transmitted.

940 
WWUS20 KWNS 020059
SEL6  
SPC WW 020059
FLZ000-GAZ000-CWZ000-020800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 76
NWS STORM PREDICTION CENTER NORMAN OK
900 PM EDT FRI APR 1 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  NORTHERN FLORIDA
  SOUTHERN GEORGIA
  COASTAL WATERS

* EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 900 PM
  UNTIL 400 AM EDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE TORNADOES POSSIBLE
  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
  ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE

SUMMARY...ONE OR TWO LINES OF THUNDERSTORMS EXPECTED TO MOVE
GENERALLY EAST-NORTHEAST ACROSS WATCH AREA THROUGH EARLY SATURDAY. 
A FEW EMBEDDED STORMS WILL BE CAPABLE OF DAMAGING WIND...MARGINALLY
SEVERE HAIL...AND POSSIBLY A COUPLE TORNADOES.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTHWEST OF PANAMA
CITY FLORIDA TO 30 MILES SOUTHEAST OF BRUNSWICK GEORGIA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU6).

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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 75...

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.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 1, 11:39 PM EDTMesoscale DiscussionSPCBaker, Bradford, Columbia, Franklin, Hamilton, Jefferson and 7 more66 min
Apr 2, 2:19 AM EDTMesoscale DiscussionSPCDixie, Gilchrist, Lafayette, Taylor56 min
Apr 2, 4:18 AM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 15 more117 min
Apr 2, 6:00 AM EDTSevere Thunderstorm WatchSPCAlachua, Bradford, Citrus, Clay, Flagler, Gilchrist and 12 more7 hr
Apr 2, 8:42 AM EDTMesoscale DiscussionSPCHernando, Pasco, Pinellas93 min
Apr 2, 12:01 PM EDTMesoscale DiscussionSPCHernando, Lake, Orange, Pasco, Seminole, Sumter and 1 more59 min

Nearby

Tornado Watches in Florida, 2016Tornado Watches in Georgia, 2016Every tornado watch in 2016

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.