Alert archive / Florida / Flash Flood Warnings in 2017

Flash Flood Warning 16, NWS Jacksonville, FL

September 11, 20174 counties in Florida; Camden County, Georgia

NWS Jacksonville, FL issued this flash flood warning at Sep 11, 2017, 5:34 AM EDT for 4 counties in Florida; Camden County, Georgia. It was in force for 3 hr. 3 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 11, 2017, 5:34 AM EDT (09:34 UTC)
Expired: Sep 11, 2017, 8:30 AM EDT
In force: 3 hr
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Flood severity: None

Counties Clay County, FL, Duval County, FL, Nassau County, FL, Saint Johns County, FL, Camden County, GA

The radar

The Jacksonville radar (KJAX), 35 km from the middle of the area, began a volume at 09:34 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
Sep 11, 7:15 AM EDT	FLASH FLOOD	3 Sw Durbin, FL	EAST BOUND LANES OF SR 210 CLOSED AT THE I-95 INTERCHANGE DUE TO FLOOD WATERS OVER THE ROAD.
Sep 11, 7:52 AM EDT	FLASH FLOOD	1 Nne Normandy, FL	MULTIPLE CARS STALLED IN FLOOD WATERS ON LANE AVE JUST NORTH OF I-10.
Sep 11, 8:00 AM EDT	FLASH FLOOD	1 S Jacksonville Inter, FL	WATER FLOWING OVER LEM TURNER ROAD.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 3 storm reports to this flash flood warning; the first came 101 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 9.6 hours before the alert went out and 36 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: 270 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 514 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 282 m²/s²
0-3 km storm-relative helicity: 319 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.9

Open this sounding in Storm Lab

The text

As transmitted.

431 
WGUS52 KJAX 110934
FFWJAX
FLC019-031-089-109-GAC039-111230-
/O.NEW.KJAX.FF.W.0016.170911T0934Z-170911T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jacksonville FL
534 AM EDT MON SEP 11 2017

The National Weather Service in Jacksonville has issued a

* Flash Flood Warning for...
  Northeastern Nassau County in northeastern Florida...
  Central St. Johns County in northeastern Florida...
  Northeastern Clay County in northeastern Florida...
  Duval County in northeastern Florida...
  South central Camden County in southeastern Georgia...

* Until 830 AM EDT

* At 533 AM EDT, Doppler radar indicated heavy rain across the 
  warned area. 8 to 15 inches of rain has fallen. Flash flooding is 
  already occurring.

* Some locations that will experience flooding include...
  Jacksonville, St. Marys, Saint Augustine, Fernandina Beach, Orange
  Park, Green Cove Springs, Jacksonville International Arpt, Unf,
  Mandarin and Fruit Cove.

Additional rainfall amounts of 2 to 4 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

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.

&&

LAT...LON 2988 8175 3077 8180 3075 8142 3025 8135
      3010 8129 2988 8125

$$

HESS

1 follow-up statement

746 
WGUS72 KJAX 111226
FFSJAX

Flash Flood Statement
National Weather Service Jacksonville FL
826 AM EDT MON SEP 11 2017

FLC019-031-089-109-GAC039-111235-
/O.EXP.KJAX.FF.W.0016.000000T0000Z-170911T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Nassau FL-St. Johns FL-Clay FL-Duval FL-Camden GA-
826 AM EDT MON SEP 11 2017

...THE FLASH FLOOD WARNING FOR NORTHEASTERN NASSAU...CENTRAL ST.
JOHNS...NORTHEASTERN CLAY...DUVAL AND SOUTH CENTRAL CAMDEN COUNTIES
WILL EXPIRE AT 830 AM EDT...

The heavy rain has mainly ended, but current flooding will be slow 
to recede. A separate Flood Warning has been issued for continued 
flooding.

LAT...LON 2988 8175 3077 8180 3075 8142 3025 8135
      3010 8129 2988 8125

$$

ARB

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before this flash flood warning went out at Sep 11, 3:57 AM EDT, 1 hour 37 minutes earlier.

Area forecast discussion, Sep 11, 3:57 AM EDT, 1 hour 37 minutes before

Area Forecast Discussion
National Weather Service Jacksonville FL
357 AM EDT Mon Sep 11 2017

...HURRICANE WARNING CONTINUES THIS MORNING...

.SHORT TERM...Today and tonight...Hurricane Irma at 07z was
centered over west central Fl just north of Tampa and moving to
the NNW. Rainbands over the area will continue the threat of
flooding rainfall and damaging winds...with isolated tornadoes
and a storm surge at the coast. As Irma moves faster to the nw
today conditions will slowly improve from south to north this
afternoon and evening. Strong winds early this morning will
decrease but still remain strong and gusty through the afternoon
as ne winds veer around to the south.

Tuesday through Wednesday...Irma will be well to the nw of the
area on Tuesday with drier air and lighter winds expected for ne
Fl/se Ga. With ample sun and sw winds temperatures will be at or a
few degrees above average Tue and Wed. A deep sw flow will
increase moisture across the area on Wednesday with scattered
afternoon/evening showers and storms expected.

.LONG TERM...Thursday through Sunday...A moist sw flow will
prevail this period. Expect scattered diurnal storms each day with
a few strong storms possbile on Thursday due to moderate speed
shear in the vertical wind profile. Winds and shear will decrease
after Thursday. Temperatures will be a little above average
through the period. Extended range models show Hurricane Jose in
the Atlantic meandering and doing a loop while staying east of
the se U.S coast.

&&

.AVIATION...IFR/LIFR conditions will continue this morning as
rainbands from Hurricane Irma affect ne Fl/se Ga TAF sites.
Improving conditions expected to spread from south to north this
afternoon. Strong ne winds will veer to the south by early
afternoon with gusts to near 40 knots continuing through the
afternoon hours along with MVFR cigs.

&&

.MARINE...Hurricane warning continues for the waters as Irma
continues to produce extremely hazardous conditions. Effects from
Irma will start to subside late today but seas will be slower to
fall and stay elevated due to swells. Northeast winds this morning
will become southerly by this afternoon. Winds and seas look
relatively benign Wednesday through Friday with the possibility
that the track of Hurricane Jose may affect the waters with at
least swells by the end of the week.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  79  66  83  67 / 100  30  10  10
SSI  84  74  86  73 / 100  30  10  10
JAX  84  71  87  71 / 100  20  10  10
SGJ  87  72  87  72 /  90  20  10  10
GNV  83  70  87  70 /  90  30  20  10
OCF  82  72  87  71 /  90  30  20  10

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...Flash Flood Watch through this evening for Alachua-Baker-
     Bradford-Clay-Coastal Duval-Coastal Nassau-Columbia-Flagler-
     Gilchrist-Hamilton-Inland Duval-Inland Nassau-Marion-Putnam-
     St. Johns-Suwannee-Union.

     Hurricane Warning for Alachua-Baker-Bradford-Clay-Coastal Duval-
     Coastal Nassau-Columbia-Flagler-Gilchrist-Hamilton-Inland
     Duval-Inland Nassau-Marion-Putnam-St. Johns-Suwannee-Union.

GA...Flash Flood Watch through this evening for Appling-Atkinson-
     Bacon-Brantley-Charlton-Clinch-Coastal Camden-Coastal Glynn-
     Coffee-Echols-Inland Camden-Inland Glynn-Jeff Davis-Pierce-
     Ware-Wayne.

     Tropical Storm Warning for Appling-Bacon-Brantley-Charlton-
     Coastal Camden-Coastal Glynn-Coffee-Inland Camden-Inland
     Glynn-Jeff Davis-Pierce-Ware-Wayne.

     Hurricane Watch for Coastal Camden-Coastal Glynn-Inland Camden-
     Inland Glynn.

     Hurricane Warning for Atkinson-Clinch-Echols.

AM...Hurricane Warning for Coastal waters from Altamaha Sound to
     Fernandina Beach FL out 20 NM-Coastal waters from
     Fernandina Beach to St. Augustine FL out 20 NM-Coastal
     waters from St. Augustine to Flagler Beach FL out 20 NM-
     Waters from Altamaha Sound GA to Fernandina Beach FL from
     20 to 60 NM-Waters from Fernandina Beach to St. Augustine
     FL from 20 to 60 NM-Waters from St. Augustine to Flagler
     Beach FL from 20 to 60 NM.

&&

Zibura/Kennedy/Shashy

Hazardous weather outlook, Sep 10, 6:09 AM EDT, 23 hours 25 minutes before

Hazardous Weather Outlook
National Weather Service Jacksonville FL
609 AM EDT Sun Sep 10 2017

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125-
GAZ132>136-149>154-162>166-101800-
Coastal waters from Altamaha Sound to Fernandina Beach FL out
20 NM-
Coastal waters from Fernandina Beach to St. Augustine FL out
20 NM-
Coastal waters from St. Augustine to Flagler Beach FL out 20 NM-
Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to
60 NM-
Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM-
Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM-
Hamilton-Suwannee-Columbia-Baker-Inland Nassau-Inland Duval-Union-
Bradford-Clay-St. Johns-Gilchrist-Alachua-Putnam-Flagler-Marion-
Coastal Nassau-Coastal Duval-Coffee-Jeff Davis-Bacon-Appling-
Wayne-Atkinson-Ware-Pierce-Brantley-Inland Glynn-Coastal Glynn-
Echols-Clinch-Charlton-Inland Camden-Coastal Camden-
609 AM EDT Sun Sep 10 2017

This Hazardous Weather Outlook is for Northeast Florida,
Southeast Georgia and the Adjacent Coastal Waters.

Please refer to the Hurricane Local Statement for information
regarding the approach of major Hurricane Irma.

For additional information, visit the National Weather Service in
Jacksonville website on the internet at weather.gov/jax.

In the hours before

Local storm report, Sep 11, 3:45 AM EDT, 1 hour 49 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
345 AM EDT MON SEP 11 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0341 AM     HURRICANE        JACKSONVILLE INTL ARPT  30.48N 81.71W
09/11/2017                   DUVAL              FL   ASOS

            SUSTAINED 51KT/59MPH WITH PEAK GUST TO 75KT/86MPH

&&

AK

Local storm report, Sep 11, 3:50 AM EDT, 1 hour 44 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
350 AM EDT MON SEP 11 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0338 AM     HURRICANE        1 WNW MAYPORT           30.39N 81.42W
09/11/2017                   Duval              FL   ASOS

            MAYPORT SUSTAINED WIND 59KT/68MPH WITH PEAK GUST
            76KT/87MPH

&&

AK

Local storm report, Sep 11, 4:26 AM EDT, 1 hour 8 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
426 AM EDT MON SEP 11 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0200 AM     HIGH SUST WINDS  5 NNW TALBOT ISLAND     30.54N 81.44W
09/11/2017  M106 MPH         Nassau             FL   BROADCAST MEDIA

            DAVIS WEATHER STATION ON DUNES ROW AT SOUTH END OF AMELIA
            ISLAND AT 60 FEET OF ELEVATION REPORTED WIND GUST OF 106
            MPH BETWEEN 1 AND 230 AM.

&&

AK

Local storm report, Sep 11, 4:43 AM EDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
443 AM EDT MON SEP 11 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0342 AM     HURRICANE        1 SW JACKSONVILLE INTL  30.47N 81.72W
09/11/2017                   Duval              FL   NWS EMPLOYEE

            MULTIPLE TREES DOWN AT NWS OFFICE. TREE BLOCKING ROADWAY
            OUT OF OFFICE. TREE FELL ON NATIONAL WEATHER SERVICE SIGN
            DAMAGING IT.

&&

AK

Local storm report, Sep 11, 5:03 AM EDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
503 AM EDT MON SEP 11 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0400 AM     STORM SURGE      4 SSE MARINELAND        29.61N 81.19W
09/11/2017  U0.00 FT         FLAGLER            FL   EMERGENCY MNGR

            REPORTS OF STORM SURGE IN MARINELAND ACRES JUST SOUTH OF
            WASHINGTON OAKS STATE PARK. PUBLIC REPORTS OF SURGE
            SIMILAR TO HURRICANE MATTHEW.

&&

ASHASHY

Local storm report, Sep 11, 5:16 AM EDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
National Weather Service Jacksonville FL
516 AM EDT MON SEP 11 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0430 AM     HURRICANE        4 S ARLINGTON           30.28N 81.60W
09/11/2017                   Duval              FL   BROADCAST MEDIA

            ROOF BLOWN OFF HOME IN SANS SOUCI NEIGHBORHOOD FROM
            STRONG WINDS.

&&

AK

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 10, 8:06 PM EDT	Areal Flood Warning	JAX	Duval, Nassau, Saint Johns	3 hr
Sep 10, 8:09 PM EDT	Areal Flood Warning	JAX	Clay, Duval, Flagler, Putnam, Saint Johns	3 hr
Sep 10, 8:10 PM EDT	Tornado Warning	JAX	Flagler, Saint Johns	35 min
Sep 10, 8:38 PM EDT	Areal Flood Warning	JAX	Alachua, Baker, Bradford, Clay, Duval, Putnam and 2 more	3 hr
Sep 10, 8:44 PM EDT	Areal Flood Warning	JAX	Duval, Nassau	3 hr
Sep 10, 10:23 PM EDT	Flash Flood Warning	JAX	Duval, Nassau	3 hr
Sep 10, 10:56 PM EDT	Areal Flood Warning	JAX	Clay, Duval, Nassau, Saint Johns	6 hr
Sep 11, 12:26 AM EDT	Areal Flood Warning	JAX	Alachua, Bradford, Clay, Flagler, Marion, Putnam and 1 more	3 hr
Sep 11, 12:38 AM EDT	Areal Flood Warning	JAX	Nassau	6 hr
Sep 11, 12:49 AM EDT	Flash Flood Warning	JAX	Flagler, Marion, Putnam, Saint Johns	5 hr
Sep 11, 1:35 AM EDT	Flash Flood Warning	JAX	Clay, Flagler, Putnam, Saint Johns	3 hr
Sep 11, 2:02 AM EDT	Tornado Warning	JAX	Nassau	28 min
Sep 11, 2:10 AM EDT	Flash Flood Warning	JAX	Clay, Saint Johns	3 hr
Sep 11, 2:31 AM EDT	Flash Flood Warning	JAX	Clay, Duval, Nassau, Saint Johns	3 hr
Sep 11, 2:34 AM EDT	Tornado Warning	JAX	Nassau	6 min
Sep 11, 2:41 AM EDT	Flash Flood Warning	JAX	Clay, Duval, Saint Johns	3 hr
Sep 11, 3:36 AM EDT	Tornado Warning	JAX	Duval	24 min
Sep 11, 4:10 AM EDT	Flash Flood Warning	JAX	Duval, Nassau	3 hr
Sep 11, 4:22 AM EDT	Areal Flood Advisory	JAX	Marion	3 hr
Sep 11, 4:38 AM EDT	Areal Flood Advisory	JAX	Alachua, Bradford, Clay, Putnam	3 hr
Sep 11, 5:08 AM EDT	Areal Flood Warning	JAX	Alachua, Baker, Bradford, Columbia, Gilchrist, Union	3 hr
Sep 11, 5:14 AM EDT	Flash Flood Warning	JAX	Nassau	3 hr
Sep 11, 6:15 AM EDT	Flash Flood Warning	JAX	Baker, Bradford, Clay, Columbia, Duval, Union	3 hr
Sep 11, 6:37 AM EDT	Areal Flood Warning	JAX	Columbia, Hamilton, Suwannee	3 hr
Sep 11, 6:45 AM EDT	Flash Flood Warning Emergency	JAX	Duval	6 hr
Sep 11, 8:23 AM EDT	Areal Flood Warning	JAX	Clay, Duval, Nassau, Saint Johns	3 hr
Sep 11, 9:06 AM EDT	Areal Flood Warning	JAX	Baker, Bradford, Clay, Columbia, Duval, Union	3 hr
Sep 11, 9:48 AM EDT	River Flood Warning	JAX	Columbia, Gilchrist, Suwannee	18 days
Sep 11, 12:19 PM EDT	Flash Flood Warning Emergency	JAX	Clay, Duval, Putnam, Saint Johns	6 hr
Sep 11, 5:11 PM EDT	Wind Advisory	JAX	Baker, Bradford, Duval, Flagler, Gilchrist, Nassau and 2 more	5 hr
Sep 11, 5:18 PM EDT	Coastal Flood Warning	JAX	Duval, Flagler, Nassau	3 days
Sep 11, 5:18 PM EDT	Rip Current Statement	JAX	Duval, Flagler, Nassau	27 hr
Sep 11, 5:18 PM EDT	High Surf Advisory	JAX	Duval, Flagler, Nassau	10 hr
Sep 11, 5:26 PM EDT	Small Craft Advisory	JAX		28 hr
Sep 10, 10:31 PM EDT	River Flood Warning	JAX	Appling, Tattnall, Toombs, Wayne	24 hr
Sep 11, 5:18 AM EDT	Tornado Warning	JAX	Camden	27 min
Sep 11, 6:41 AM EDT	Areal Flood Warning	JAX	Brantley, Charlton, Clinch, Pierce, Ware, Wayne	3 hr
Sep 11, 8:09 AM EDT	Flash Flood Warning	JAX	Brantley, Camden, Charlton, Glynn	111 min
Sep 11, 9:41 AM EDT	Flash Flood Warning	JAX	Charlton, Ware	2 hr
Sep 11, 9:46 AM EDT	Areal Flood Warning	JAX	Brantley, Charlton, Pierce, Ware, Wayne	3 hr
Sep 11, 9:56 AM EDT	Areal Flood Warning	JAX	Brantley, Camden, Charlton, Glynn	2 hr
Sep 11, 3:07 PM EDT	River Flood Warning	JAX	Brantley	16 days

Nearby

Flash Flood Warnings in Florida, 2017 Flash Flood Warnings in Georgia, 2017 Every flash flood warning 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.