Alert archive / Florida / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 21, NWS Tampa Bay, FL

April 25, 2010Levy County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Apr 25, 2010, 12:40 PM EDT for Levy County, Florida. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 25, 2010, 12:40 PM EDT (16:40 UTC)
Expired: Apr 25, 2010, 1:30 PM EDT
In force: 50 min
Issued by: NWS Tampa Bay, FL
Area: Storm-based polygon

County Levy County, FL

The radar

The Jacksonville radar (KJAX), 159 km from the middle of the area, began a volume at 16:43 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 25, 12:18 PM EDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 4.7 hours before the alert went out and 161 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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

The text

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

762 
WUUS52 KTBW 251640
SVRTBW
FLC075-251730-
/O.NEW.KTBW.SV.W.0021.100425T1640Z-100425T1730Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
1240 PM EDT SUN APR 25 2010

THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN LEVY COUNTY IN FLORIDA.

* UNTIL 130 PM EDT

* AT 1235 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 18
  MILES SOUTHWEST OF CHIEFLAND...OR 17 MILES NORTH OF CEDAR KEY...AND
  MOVING EAST AT 55 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CHIEFLAND.
  BRONSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT SUNDAY EVENING FOR
NORTHWESTERN FLORIDA. IF A TORNADO IS SPOTTED...ACT  QUICKLY AND 
MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...SUCH AS A BASEMENT 
OR SMALL INTERIOR ROOM. THIS STORM HAS THE POTENTIAL TO CAUSE 
SERIOUS INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

&&

LAT...LON 2960 8279 2957 8275 2956 8266 2955 8264
      2955 8256 2948 8254 2948 8240 2945 8240
      2918 8306 2922 8309 2924 8307 2926 8309
      2929 8316 2936 8307 2941 8303 2960 8293
TIME...MOT...LOC 1639Z 253DEG 49KT 2939 8308

$$

1 follow-up statement

935 
WWUS52 KTBW 251703
SVSTBW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
103 PM EDT SUN APR 25 2010

FLC075-251730-
/O.CON.KTBW.SV.W.0021.000000T0000Z-100425T1730Z/
LEVY FL-
103 PM EDT SUN APR 25 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM EDT
FOR NORTHERN LEVY COUNTY...

AT 100 PM EDT...DOPPLER RADAR CONTINUED TO INDICATE A GROUP OF 
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND 
DAMAGING WINDS IN EXCESS OF 60 MPH.  THE STRONGEST STORM WAS LOCATED 
NEAR OTTER CREEK...OR 8 MILES SOUTH OF CHIEFLAND...MOVING EAST AT 45 
MPH. ADDITIONAL STORMS ARE LOCATED OVER EXTREME WESTERN PORTIONS OF 
THE COUNTY AS WELL AS FURTHER OFFSHORE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM EDT SUNDAY EVENING FOR
NORTHWESTERN FLORIDA.

&&

LAT...LON 2960 8279 2957 8275 2956 8266 2955 8264
      2955 8256 2948 8254 2948 8240 2945 8240
      2918 8306 2922 8309 2924 8307 2926 8309
      2929 8316 2936 8307 2941 8303 2960 8293
TIME...MOT...LOC 1702Z 253DEG 49KT 2938 8281

$$

The office that day

Everything else NWS Tampa Bay, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 25, 11:32 AM EDT	Special Weather Statement	TBW	Gilchrist	28 min
Apr 25, 11:59 AM EDT	Severe Thunderstorm Warning	TBW	Levy	46 min
Apr 25, 1:04 PM EDT	Special Marine Warning	TBW		41 min
Apr 25, 1:10 PM EDT	Special Marine Warning	TBW		35 min
Apr 25, 1:24 PM EDT	Severe Thunderstorm Warning	TBW	Levy	51 min
Apr 25, 1:53 PM EDT	Special Marine Warning	TBW		97 min
Apr 25, 5:14 PM EDT	Special Marine Warning	TBW		31 min
Apr 25, 5:20 PM EDT	Special Marine Warning	TBW		85 min
Apr 25, 5:34 PM EDT	Severe Thunderstorm Warning	TBW	Levy	26 min
Apr 25, 6:01 PM EDT	Severe Thunderstorm Warning	TBW	Hernando, Pasco	44 min
Apr 25, 6:22 PM EDT	Severe Thunderstorm Warning	TBW	Hillsborough, Pasco, Pinellas	23 min
Apr 25, 6:48 PM EDT	Special Marine Warning	TBW		87 min
Apr 25, 7:07 PM EDT	Special Weather Statement	TBW	Hillsborough, Pinellas	53 min

Nearby

Severe Thunderstorm Warnings in Florida, 2010 Every severe thunderstorm warning 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.