Alert archive / Florida / Tornado Warnings in 2017

Tornado Warning 79, NWS Jacksonville, FL

September 10, 2017Saint Johns County, Florida

NWS Jacksonville, FL issued this tornado warning at Sep 10, 2017, 7:42 PM EDT for Saint Johns County, Florida. It was in force for 33 min. 4 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Sep 10, 2017, 7:42 PM EDT (23:42 UTC)
Expired
Sep 10, 2017, 8:15 PM EDT
In force
33 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

County Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 66 km from the middle of the area, began a volume at 23:42 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 was reported inside it

TimeReportWhereRemark
Sep 10, 7:50 PM EDTTORNADO1 N Vilano Beach, FLTHIS TORNADO TOUCHED DOWN ON VILLANO BEACH NEAR 4TH AND 5TH STREET CAUSING MINOR TREE DAMAGE AS IT MOVED WEST. AFTER CROSSING THE INTER-COASTAL WATERWAY THE TORNADO INTENSIFIED TO EF-1 WITH 85-100MPH WINDS AND SNAPPED/UPROOTED MULTIPLE TREES AND CAUSED MINOR R
Sep 10, 7:52 PM EDTTORNADO4 N St. Augustine, FLMEDIA PASSED ON REPORT BY PUBLIC OF POSSIBLE TORNADO AT VILANO BEACH AT 4TH STREET.
Sep 10, 7:53 PM EDTTORNADO4 Nnw St. Augustine, FLMULTIPLE TREES AND POWER LINES DOWN. ROOF DAMAGE ON 5TH AVENUE NEAR VILLANO BEACH.
Sep 10, 8:00 PM EDTTSTM WND DMG2 Wnw Vilano Beach, FLPUBLIC REPORT OF WIND DAMAGE. TORNADO REPORT EAST OF THIS LOCATION SO POTENTIALLY MORE TORNADO DAMAGE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

IssuedProductOfficeLasted
Sep 10, 12:02 PM EDTTornado WatchSPC13 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 11.7 hours before the alert went out and 67 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 2017-09-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 396 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 2017-09-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 226 square meters per square second.193958Sfc1 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
396 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
476 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
226 m²/s²
0-3 km storm-relative helicity
297 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.9

Open this sounding in Storm Lab

The text

As transmitted.

256 
WFUS52 KJAX 102342
TORJAX
FLC109-110015-
/O.NEW.KJAX.TO.W.0079.170910T2342Z-170911T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Jacksonville FL
742 PM EDT SUN SEP 10 2017

The National Weather Service in Jacksonville has issued a

* Tornado Warning for...
  Central St. Johns County in northeastern Florida...

* Until 815 PM EDT
    
* At 741 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Vilano Beach, or 8 miles northeast of Saint
  Augustine, moving west at 40 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...
  Vilano Beach around 750 PM EDT. 
  Saint Augustine and South Ponte Vedra around 755 PM EDT. 
  World Golf Village around 805 PM EDT. 

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.

&&

LAT...LON 2990 8145 3002 8148 3004 8133 2991 8129
TIME...MOT...LOC 2341Z 084DEG 33KT 2998 8120 

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

$$

ZIBURA
3 follow-up statements
821 
WWUS52 KJAX 102353
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
753 PM EDT SUN SEP 10 2017

FLC109-110015-
/O.CON.KJAX.TO.W.0079.000000T0000Z-170911T0015Z/
St. Johns FL-
753 PM EDT SUN SEP 10 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM EDT FOR CENTRAL
ST. JOHNS COUNTY...
    
At 752 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Vilano Beach, or near Saint Augustine, moving west
at 45 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...
  World Golf Village around 805 PM EDT. 

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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 2990 8145 3000 8148 3003 8133 2991 8129
TIME...MOT...LOC 2352Z 081DEG 37KT 2995 8132 

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

$$

SHASHY
645 
WWUS52 KJAX 110002
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
802 PM EDT SUN SEP 10 2017

FLC109-110015-
/O.CON.KJAX.TO.W.0079.000000T0000Z-170911T0015Z/
St. Johns FL-
802 PM EDT SUN SEP 10 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM EDT FOR CENTRAL
ST. JOHNS COUNTY...
    
At 802 PM EDT, a severe thunderstorm capable of producing a tornado
was located near World Golf Village, or 7 miles northwest of Saint
Augustine, moving west at 40 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...
  World Golf Village around 805 PM EDT. 

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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 2990 8145 3000 8148 2998 8136 2991 8133
TIME...MOT...LOC 0002Z 084DEG 33KT 2994 8143 

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

$$

SHASHY
750 
WWUS52 KJAX 110007
SVSJAX

Severe Weather Statement
National Weather Service Jacksonville FL
807 PM EDT SUN SEP 10 2017

FLC109-110017-
/O.EXP.KJAX.TO.W.0079.000000T0000Z-170911T0015Z/
St. Johns FL-
807 PM EDT SUN SEP 10 2017

...THE TORNADO WARNING FOR CENTRAL ST. JOHNS COUNTY WILL EXPIRE AT
815 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning will be allowed to expire.

A tornado watch remains in effect until midnight EDT for northeastern
Florida.

LAT...LON 2990 8145 3000 8148 2998 8136 2991 8133
TIME...MOT...LOC 0007Z 084DEG 33KT 2994 8146 

$$

SHASHY

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 9, 9:25 PM EDTRiver Flood WarningJAXClay5 days
Sep 9, 9:27 PM EDTRiver Flood WarningJAXBaker, Nassau16 days
Sep 9, 9:39 PM EDTRiver Flood WarningJAXAlachua, Columbia, Gilchrist32 days
Sep 9, 9:42 PM EDTRiver Flood WarningJAXClay5 days
Sep 10, 5:10 AM EDTSpecial Marine WarningJAX65 min
Sep 10, 6:18 AM EDTAreal Flood WarningJAXBaker, Bradford, Clay, Duval, Saint Johns6 hr
Sep 10, 8:14 AM EDTAreal Flood WarningJAXClay, Putnam3 hr
Sep 10, 9:11 AM EDTAreal Flood WarningJAXAlachua, Bradford, Clay, Columbia, Gilchrist, Union3 hr
Sep 10, 9:59 AM EDTRiver Flood WarningJAXColumbia, Hamilton, Suwannee3 days
Sep 10, 9:59 AM EDTRiver Flood WarningJAXHamilton, Suwannee5 days
Sep 10, 10:12 AM EDTAreal Flood WarningJAXAlachua, Flagler, Marion, Putnam3 hr
Sep 10, 11:57 AM EDTAreal Flood WarningJAXAlachua, Bradford, Clay, Flagler, Putnam, Saint Johns3 hr
Sep 10, 12:05 PM EDTSpecial Marine WarningJAX25 min
Sep 10, 12:09 PM EDTAreal Flood WarningJAXClay, Duval, Nassau, Saint Johns3 hr
Sep 10, 12:19 PM EDTTornado WarningJAXFlagler, Saint Johns22 min
Sep 10, 1:11 PM EDTAreal Flood WarningJAXNassau3 hr
Sep 10, 1:28 PM EDTTornado WarningJAXFlagler32 min
Sep 10, 3:09 PM EDTAreal Flood WarningJAXFlagler, Putnam3 hr
Sep 10, 4:11 PM EDTAreal Flood WarningJAXNassau3 hr
Sep 10, 4:39 PM EDTAreal Flood WarningJAXClay, Duval, Saint Johns3 hr
Sep 10, 4:39 PM EDTTornado WarningJAXSaint Johns24 min
Sep 10, 4:58 PM EDTAreal Flood WarningJAXDuval, Nassau, Saint Johns3 hr
Sep 10, 5:21 PM EDTAreal Flood WarningJAXClay, Flagler, Putnam, Saint Johns3 hr
Sep 10, 5:43 PM EDTAreal Flood WarningJAXDuval, Nassau3 hr
Sep 10, 5:48 PM EDTAreal Flood WarningJAXFlagler, Putnam3 hr
Sep 10, 7:36 PM EDTTornado WarningJAXFlagler24 min
Sep 10, 7:59 PM EDTAreal Flood WarningJAXNassau3 hr

Nearby

Tornado Warnings in Florida, 2017Every tornado warning in 2017Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.