Alert archive / Florida / Flash Flood Warnings in 2012

Flash Flood Warning 4, NWS Jacksonville, FL

June 7, 2012Duval County, Saint Johns County, Florida

NWS Jacksonville, FL issued this flash flood warning at Jun 7, 2012, 5:14 PM EDT for Duval County, Saint Johns County, Florida. It was in force for 3 hr. 5 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: Jun 7, 2012, 5:14 PM EDT (21:14 UTC)
Expired: Jun 7, 2012, 8:15 PM EDT
In force: 3 hr
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Flood severity: None

Counties Duval County, FL, Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 27 km from the middle of the area, began a volume at 21:16 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

Time	Report	Where	Remark
Jun 7, 6:01 PM EDT	FLOOD	Arlington, FL	DEBUTANTE ROAD FLOODED BY AT LEAST A FOOT AND A HALF OF WATER. SEVERAL CARS WERE STRANDED IN THE FLOOD WATERS. A SPOTTER ON DEBUTANTE HAS MEASURED 14 INCHES OF RAIN IN THE LAST 24 HOURS.
Jun 7, 6:01 PM EDT	HEAVY RAIN 14	Arlington, FL	A SPOTTER ON DEBUTANTE ROAD RECORDED 14 INCHES OF RAIN SINCE LATE LAST EVENING.
Jun 7, 6:26 PM EDT	FLOOD	5 Ese Arlington, FL	PUBLIC REPORTED 1 TO 2 FEET OF STANDING WATER ON INDIES DRIVE.
Jun 7, 7:42 PM EDT	HEAVY RAIN 0	2 Ne Unf, FL	AN OBSERVER FOR TV-30 WTEV-WAWS REPORTED 9.5 INCHES OF RAINFALL NEAR KERNAN BLVD AND BEACH BLVD.
Jun 7, 7:42 PM EDT	HEAVY RAIN 9.5	2 Ne Unf, FL	AN OBSERVER FOR TV-30 WTEV-WAWS REPORTED 9.5 INCHES OF RAINFALL NEAR KERNAN BLVD AND BEACH BLVD.

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

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 9.2 hours before the alert went out and 28 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: 748 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 485 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

498 
WGUS52 KJAX 072114
FFWJAX
FLC031-109-080015-
/O.NEW.KJAX.FF.W.0004.120607T2114Z-120608T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
514 PM EDT THU JUN 7 2012

THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME NORTHERN ST. JOHNS COUNTY IN NORTHEAST FLORIDA
  EASTERN DUVAL COUNTY IN NORTHEAST FLORIDA

* UNTIL 815 PM EDT

* AT 512 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAINFALL...WITH HOURLY RAINFALL RATES IN EXCESS OF 3    
  INCHES PER HOUR FROM SLOW MOVING SHOWERS AND THUNDERSTORMS         
  OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO            
  MAYPORT...FORT CAROLINE...DOWNTOWN JACKSONVILLE...JACKSONVILLE     
  BEACH...AND ARLINGTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 2 TO 4 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY
EMERGENCY MANAGEMENT...OR YOU CAN ALSO CALL THE NATIONAL WEATHER
SERVICE IN JACKSONVILLE DIRECTLY AT 800-499-1594 TO REPORT FLOODING.

&&

LAT...LON 3020 8169 3045 8169 3045 8140 3041 8140
      3040 8139 3023 8137 3021 8137

$$

NELSON

1 follow-up statement

206 
WGUS72 KJAX 080012
FFSJAX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
812 PM EDT THU JUN 7 2012

FLC031-109-080016-
/O.EXP.KJAX.FF.W.0004.000000T0000Z-120608T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ST. JOHNS FL-DUVAL FL-
812 PM EDT THU JUN 7 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 815 PM EDT FOR CENTRAL
DUVAL AND EXTREME NORTHERN ST. JOHNS COUNTIES...

HEAVY RAINFALL HAS ENDED OVER DUVAL AND NORTHERN ST. JOHNS COUNTIES. 
HOWEVER...SIGNIFICANT AMOUNTS OF RUNOFF AND STANDING WATER FROM THE 
COPIOUS AMOUNTS OF RAIN THAT FELL THIS AFTERNOON AND EARLIER THIS 
EVENING WILL CREATE LOCALLY TREACHEROUS DRIVING CONDITIONS TONIGHT. 
ALTHOUGH THE THREAT FOR FLASH FLOODING HAS ENDED...AN URBAN AND 
SMALL STREAM FLOOD ADVISORY REMAINS IN EFFECT FOR SOUTHERN DUVAL AND 
NORTHERN ST. JOHNS COUNTIES UNTIL 1030 PM EDT.   

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY
EMERGENCY MANAGEMENT...OR YOU CAN ALSO CALL THE NATIONAL WEATHER
SERVICE IN JACKSONVILLE DIRECTLY AT 800-499-1594 TO REPORT FLOODING.

LAT...LON 3020 8169 3045 8169 3045 8140 3041 8140
      3040 8139 3023 8137 3021 8137

$$

NELSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 6, 8:03 PM EDT	Special Marine Warning	JAX		117 min
Jun 6, 8:56 PM EDT	Special Marine Warning	JAX		64 min
Jun 6, 9:51 PM EDT	Areal Flood Advisory	JAX	Duval	3 hr
Jun 6, 10:14 PM EDT	Special Weather Statement	JAX	Duval	61 min
Jun 6, 10:16 PM EDT	Special Weather Statement	JAX	Baker	59 min
Jun 6, 11:12 PM EDT	Areal Flood Advisory	JAX	Duval	3 hr
Jun 7, 1:59 PM EDT	Special Weather Statement	JAX	Saint Johns	46 min
Jun 7, 2:56 PM EDT	Areal Flood Advisory	JAX	Saint Johns	2 hr
Jun 7, 4:40 PM EDT	Areal Flood Advisory	JAX	Bradford, Clay, Duval, Saint Johns	6 hr
Jun 7, 4:57 PM EDT	Areal Flood Warning	JAX	Columbia, Hamilton, Suwannee	5 hr

Nearby

Flash Flood Warnings in Florida, 2012 Every flash flood warning in 2012

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.