Alert archive / Georgia / Tornado Watches in 2015

Tornado Watch 110

April 25, 201517 counties in Florida; 38 counties in Georgia

The Storm Prediction Center issued this tornado watch at Apr 25, 2015, 9:08 AM EDT for 17 counties in Florida; 38 counties in Georgia. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Apr 25, 2015, 9:08 AM EDT (13:08 UTC)
Expired
Apr 25, 2015, 4:00 PM EDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 55 counties

Baker County, FL, Calhoun County, FL, Columbia County, FL, Duval County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Nassau County, FL, Suwannee County, FL, Taylor County, FL, Wakulla County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Calhoun County, GA, Charlton County, GA, Clay County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Echols County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Pierce County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Ware County, GA, Wayne County, GA, Worth County, GA

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
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 25, 9:20 AM EDTSevere Thunderstorm WarningTAECalhoun, Gadsden, Jackson, Liberty55 min
Apr 25, 11:22 AM EDTTornado WarningTAELeon10 min
Apr 25, 12:24 PM EDTTornado WarningTAEMadison38 min
Apr 25, 12:30 PM EDTTornado WarningTAEMadison30 min
Apr 25, 12:34 PM EDTTornado WarningJAXHamilton, Suwannee26 min
Apr 25, 1:00 PM EDTTornado WarningJAXColumbia, Hamilton, Suwannee30 min
Apr 25, 1:29 PM EDTTornado WarningJAXBaker, Columbia31 min
Apr 25, 1:57 PM EDTTornado WarningJAXBaker33 min
Apr 25, 2:28 PM EDTSevere Thunderstorm WarningJAXBaker, Clay, Duval, Saint Johns47 min
Apr 25, 3:06 PM EDTTornado WarningJAXClay, Duval, Saint Johns24 min
Apr 25, 3:52 PM EDTSevere Thunderstorm WarningTAELowndes23 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 1.1 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.

Skew-T log-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 12:00Z on 2015-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 215 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, Tallahassee Rgnl, FL at 12:00Z on 2015-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 304 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
215 J/kg
Mixed-layer CIN
-111 J/kg
Mixed-layer LCL
704 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
304 m²/s²
0-3 km storm-relative helicity
365 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

998 
WWUS20 KWNS 251304
SEL0  
SPC WW 251304
FLZ000-GAZ000-CWZ000-252000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 110
NWS STORM PREDICTION CENTER NORMAN OK
905 AM EDT SAT APR 25 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

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

* EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 905 AM UNTIL
  400 PM EDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE TORNADOES POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

SUMMARY...THE RISK FOR SEVERE THUNDERSTORMS...WITH DAMAGING WINDS
AND A COUPLE OF TORNADOES POSSIBLE...IS EXPECTED TO STEADILY
INCREASE THROUGH THE MORNING ACROSS PORTIONS OF NORTHERN FLORIDA AND
SOUTH GEORGIA.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 10 MILES WEST SOUTHWEST OF
MARIANNA FLORIDA TO 15 MILES NORTH NORTHEAST OF JACKSONVILLE
FLORIDA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 107...WW 108...WW 109...

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 27040.


...GUYER

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 25, 1:50 AM EDTTornado WatchSPCDallas, Fayette, Greene, Hale, Lamar, Marengo and 4 more6 hr
Apr 25, 3:07 AM EDTMesoscale DiscussionSPCChoctaw, Greene, Pickens, Sumter, Tuscaloosa83 min
Apr 25, 5:12 AM EDTMesoscale DiscussionSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Dallas and 9 more63 min
Apr 25, 6:00 AM EDTTornado WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Clarke and 18 more7 hr
Apr 25, 8:41 AM EDTMesoscale DiscussionSPCCoffee, Covington, Dale, Geneva, Henry, Houston94 min
Apr 25, 10:35 AM EDTMesoscale DiscussionSPCBaldwin, Mobile, Washington115 min
Apr 25, 2:36 PM EDTSevere Thunderstorm WatchSPCBaldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 5 more4 hr
Apr 25, 2:50 PM EDTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 4 more85 min
Apr 25, 3:10 PM EDTMesoscale DiscussionSPCAutauga, Bibb, Bullock, Calhoun, Chambers, Chilton and 19 more95 min
Apr 25, 4:07 PM EDTSevere Thunderstorm WatchSPCBarbour, Coffee, Dale, Geneva, Henry, Houston and 1 more7 hr
Apr 25, 5:38 PM EDTSevere Thunderstorm WatchSPCBullock, Chambers, Clay, Lee, Macon, Randolph and 2 more5 hr
Apr 25, 12:20 PM EDTMesoscale DiscussionSPCColumbia, Gadsden, Hamilton, Jefferson, Lafayette, Leon and 5 more85 min
Apr 25, 3:30 PM EDTMesoscale DiscussionSPCBaker, Columbia, Duval, Gadsden, Hamilton, Jefferson and 5 more60 min
Apr 25, 7:19 PM EDTMesoscale DiscussionSPCCalhoun, Franklin, Gadsden, Gulf, Hamilton, Jackson and 6 more56 min
Apr 25, 6:07 PM EDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Effingham and 7 more53 min
Apr 25, 6:28 PM EDTSevere Thunderstorm WatchSPCBryan, Bulloch, Burke, Candler, Chatham, Effingham and 7 more4 hr

Nearby

Tornado Watches in Georgia, 2015Tornado Watches in Florida, 2015Every tornado watch in 2015

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.