Alert archive / Florida / Tornado Warnings in 2017

Tornado Warning 17, NWS Tampa Bay, FL

November 23, 2017Pasco County, Florida

NWS Tampa Bay, FL issued this tornado warning at Nov 23, 2017, 12:45 PM EST for Pasco County, Florida. It was in force for 13 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: Nov 23, 2017, 12:45 PM EST (17:45 UTC)
Expired: Nov 23, 2017, 12:58 PM EST
In force: 13 min
Issued by: NWS Tampa Bay, FL
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Pasco County, FL

The radar

The Tampa radar (KTBW), 72 km from the middle of the area, began a volume at 17:49 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 nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 5.8 hours before the alert went out and 72 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: 552 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 749 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 198 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.5

Open this sounding in Storm Lab

The text

As transmitted.

056 
WFUS52 KTBW 231745
TORTBW
FLC101-231815-
/O.NEW.KTBW.TO.W.0017.171123T1745Z-171123T1815Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Tampa Bay Area Ruskin FL
1245 PM EST THU NOV 23 2017

The National Weather Service in Ruskin has issued a

* Tornado Warning for...
  West central Pasco County in west central Florida...

* Until 115 PM EST
    
* At 1245 PM EST, a thunderstorm capable of producing a tornado was 
  located over Jasmine Estates, or over New Port Richey, moving 
  northeast at 20 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Jasmine Estates around 1255 PM EST. 
  Hudson around 100 PM EST. 

Other locations impacted by this tornadic thunderstorm include
Bayonet Point, Moon Lake and Shady Hills.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to an interior room on the lowest floor of a
sturdy building. Avoid windows. If you are outdoors, in a mobile
home, or in a vehicle, move to the closest substantial shelter and
protect yourself from flying debris.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Ruskin.

&&

LAT...LON 2825 8273 2827 8276 2841 8265 2832 8255
TIME...MOT...LOC 1745Z 229DEG 18KT 2829 8271 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

TBW

1 follow-up statement

872 
WWUS52 KTBW 231758
SVSTBW

Severe Weather Statement
National Weather Service Tampa Bay Area Ruskin FL
1258 PM EST THU NOV 23 2017

FLC101-231807-
/O.CAN.KTBW.TO.W.0017.000000T0000Z-171123T1815Z/
Pasco FL-
1258 PM EST THU NOV 23 2017

...THE TORNADO WARNING FOR WEST CENTRAL PASCO COUNTY IS CANCELLED...
                
The storm which prompted the warning has weakened, and no longer 
appears capable of producing a tornado. Therefore the warning has 
been cancelled.  However gusty winds are still possible with this 
thunderstorm.

LAT...LON 2825 8273 2827 8276 2841 8265 2832 8255
TIME...MOT...LOC 1755Z 229DEG 18KT 2833 8266 

$$

TBW

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 22, 8:44 PM EST	Special Weather Statement	TBW	Pinellas	31 min
Nov 23, 5:40 AM EST	Special Marine Warning	TBW		50 min
Nov 23, 6:22 AM EST	Special Weather Statement	TBW	Sumter	23 min
Nov 23, 6:31 AM EST	Special Marine Warning	TBW		44 min
Nov 23, 7:02 AM EST	Special Weather Statement	TBW	Lee	43 min
Nov 23, 7:04 AM EST	Special Marine Warning	TBW		56 min
Nov 23, 7:58 AM EST	Special Marine Warning	TBW		62 min
Nov 23, 8:54 AM EST	Special Marine Warning	TBW		66 min
Nov 23, 9:24 AM EST	Special Marine Warning	TBW		66 min
Nov 23, 10:02 AM EST	Special Marine Warning	TBW		58 min
Nov 23, 11:06 AM EST	Areal Flood Advisory	TBW	Citrus, Levy, Sumter	114 min
Nov 23, 12:20 PM EST	Special Weather Statement	TBW	DeSoto	25 min
Nov 23, 12:26 PM EST	Special Weather Statement	TBW	Pasco	34 min

Nearby

Tornado Warnings in Florida, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.