Alert archive / Florida / Tornado Watches in 2007
Tornado Watch 148
The Storm Prediction Center issued this tornado watch at Apr 15, 2007, 9:45 AM EDT for 24 counties in Florida. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2007, 9:45 AM EDT (13:45 UTC)
- Expired
- Apr 15, 2007, 5:00 PM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 24 counties
Brevard County, FL, Broward County, FL, Charlotte County, FL, Collier County, FL, DeSoto County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Highlands County, FL, Indian River County, FL, Lake County, FL, Lee County, FL, Martin County, FL, Miami-Dade County, FL, Monroe County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Palm Beach County, FL, Polk County, FL, Saint Lucie County, FL, Sarasota County, FL, Seminole County, FL, Volusia County, FL
The radar
The Tampa radar (KTBW), 88 km from the middle of the area, began a volume at 13:46 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
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 10:45 AM EDT | Severe Thunderstorm Warning | TBW | Polk | 45 min |
| Apr 15, 1:10 PM EDT | Severe Thunderstorm Warning | MLB | Brevard | 35 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
Tampa Bay, FL (KTBW), launched 12:00Z, 1.8 hours before the alert went out and 88 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.
- Mixed-layer CAPE
- 1470 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 579 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 331 m²/s²
- 0-3 km storm-relative helicity
- 310 m²/s²
- Significant tornado parameter
- 2.9
- Supercell composite
- 12.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 151344
SEL8
SPC WW 151344
FLZ000-CWZ000-152100-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 148
NWS STORM PREDICTION CENTER NORMAN OK
945 AM EDT SUN APR 15 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL AND SOUTHERN FLORIDA
COASTAL WATERS
EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 945 AM UNTIL 500
PM EDT.
TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHWEST OF
ORLANDO FLORIDA TO 50 MILES SOUTHWEST OF MIAMI FLORIDA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU8).
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 146...WW 147...
DISCUSSION...LINE OF STRONG/SEVERE THUNDERSTORMS WILL CONTINUE
TRACKING EASTWARD ACROSS THE PENINSULA TODAY. MORNING SOUNDINGS AND
MODEL GUIDANCE INDICATE A CONTINUED RISK OF EMBEDDED SUPERCELLS AND
BOWS WITHIN THE LINE...POSING A RISK OF DAMAGING WINDS AND ISOLATED
TORNADOES. PARTS OF SOUTH FL WILL SEE CONSIDERABLE HEATING
TODAY...WHICH MAY OFFSET WEAKER LARGE SCALE FORCING AND MAINTAIN
THREAT THIS AFTERNOON.
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 26035.
...HARTSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 14, 8:09 PM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 12 more | 2 hr |
| Apr 14, 11:45 PM EDT | Tornado Watch | SPC | Calhoun, Franklin, Gadsden, Gulf, Jackson, Jefferson and 4 more | 6 hr |
| Apr 15, 2:27 AM EDT | Mesoscale Discussion | SPC | Alachua, Citrus, Dixie, Franklin, Gilchrist, Hernando and 4 more | 2 hr |
| Apr 15, 9:31 AM EDT | Mesoscale Discussion | SPC | Brevard, Broward, Charlotte, Collier, DeSoto, Flagler and 22 more | 59 min |
| Apr 15, 1:03 PM EDT | Mesoscale Discussion | SPC | Broward, Collier, Glades, Hendry, Highlands, Indian River and 7 more | 117 min |
| Apr 15, 3:42 PM EDT | Mesoscale Discussion | SPC | Broward, Miami-Dade, Monroe, Palm Beach | 93 min |
Nearby
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.