Alert archive / Florida / Tornado Watches in 2010

Tornado Watch 104

April 25, 201018 counties in Florida

The Storm Prediction Center issued this tornado watch at Apr 25, 2010, 12:18 PM EDT for 18 counties in Florida. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Apr 25, 2010, 12:18 PM EDT (16:18 UTC)
Expired
Apr 25, 2010, 8:00 PM EDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
65 kt

Counties Alachua County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Dixie County, FL, Flagler County, FL, Gilchrist County, FL, Hernando County, FL, Lake County, FL, Levy County, FL, Marion County, FL, Orange County, FL, Pasco County, FL, Putnam County, FL, Saint Johns County, FL, Seminole County, FL, Sumter County, FL, Volusia County, FL

The radar

The Jacksonville radar (KJAX), 152 km from the middle of the area, began a volume at 16:19 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
40%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 25, 12:40 PM EDTSevere Thunderstorm WarningTBWLevy50 min
Apr 25, 1:24 PM EDTSevere Thunderstorm WarningTBWLevy51 min
Apr 25, 1:49 PM EDTSevere Thunderstorm WarningJAXAlachua, Marion41 min
Apr 25, 1:57 PM EDTSevere Thunderstorm WarningJAXMarion36 min
Apr 25, 2:22 PM EDTTornado WarningJAXMarion, Putnam38 min
Apr 25, 2:52 PM EDTSevere Thunderstorm WarningJAXFlagler, Putnam, Saint Johns38 min
Apr 25, 4:27 PM EDTSevere Thunderstorm WarningJAXAlachua, Baker, Bradford, Columbia, Union25 min
Apr 25, 4:50 PM EDTSevere Thunderstorm WarningJAXBaker, Bradford, Clay, Duval, Nassau, Saint Johns and 1 more25 min
Apr 25, 5:34 PM EDTSevere Thunderstorm WarningTBWLevy26 min
Apr 25, 5:52 PM EDTSevere Thunderstorm WarningJAXSaint Johns23 min
Apr 25, 6:00 PM EDTSevere Thunderstorm WarningJAXFlagler, Putnam, Saint Johns45 min
Apr 25, 6:01 PM EDTSevere Thunderstorm WarningTBWHernando, Pasco44 min
Apr 25, 6:17 PM EDTSevere Thunderstorm WarningJAXBaker, Bradford, Clay, Duval, Nassau, Saint Johns43 min
Apr 25, 6:22 PM EDTSevere Thunderstorm WarningTBWHillsborough, Pasco, Pinellas23 min
Apr 25, 7:26 PM EDTSevere Thunderstorm WarningMLBBrevard, Orange, Seminole, Volusia49 min
Apr 25, 7:38 PM EDTSevere Thunderstorm WarningMLBLake, Orange, Osceola, Seminole52 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, 4.3 hours before the alert went out and 154 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 2010-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 334 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 2010-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 311 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
334 J/kg
Mixed-layer CIN
-211 J/kg
Mixed-layer LCL
776 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
311 m²/s²
0-3 km storm-relative helicity
337 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 24, 8:19 PM EDTMesoscale DiscussionSPCBay, Calhoun, Escambia, Franklin, Gulf, Holmes and 6 more56 min
Apr 24, 10:58 PM EDTMesoscale DiscussionSPCBay, Calhoun, Escambia, Gadsden, Gulf, Holmes and 9 more32 min
Apr 24, 11:46 PM EDTTornado WatchSPCBay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 4 more7 hr
Apr 25, 4:01 AM EDTMesoscale DiscussionSPCCalhoun, Gadsden, Jackson, Liberty, Washington89 min
Apr 25, 6:38 AM EDTMesoscale DiscussionSPCCalhoun, Gadsden, Leon, Liberty67 min
Apr 25, 12:00 PM EDTMesoscale DiscussionSPCAlachua, Bradford, Citrus, Dixie, Flagler, Gilchrist and 11 more60 min
Apr 25, 2:25 PM EDTMesoscale DiscussionSPCFlagler, Marion, Putnam, Volusia65 min
Apr 25, 4:17 PM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 11 more58 min
Apr 25, 6:25 PM EDTMesoscale DiscussionSPCBrevard, Hardee, Hillsborough, Lake, Manatee, Orange and 8 more65 min
Apr 25, 6:56 PM EDTSevere Thunderstorm WatchSPCBrevard, Charlotte, DeSoto, Hardee, Hernando, Highlands and 15 more5 hr

Nearby

Tornado Watches in Florida, 2010Every tornado watch in 2010

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.