Alert archive / Florida / Flash Flood Warnings in 2021

Flash Flood Warning 1, NWS Jacksonville, FL

March 30, 2021Bradford County, Florida

NWS Jacksonville, FL issued this flash flood warning at Mar 30, 2021, 8:51 AM EDT for Bradford County, Florida. It was in force for 76 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: Mar 30, 2021, 8:51 AM EDT (12:51 UTC)
Expired: Mar 30, 2021, 10:07 AM EDT
In force: 76 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Flood severity: None

County Bradford County, FL

The radar

The Jacksonville radar (KJAX), 77 km from the middle of the area, began a volume at 12:54 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

Jacksonville, FL (KJAX), launched 12:00Z, 0.9 hours before the alert went out and 78 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: 360 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 943 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

As transmitted.

889 
WGUS52 KJAX 301251
FFWJAX
FLC007-301500-
/O.NEW.KJAX.FF.W.0001.210330T1251Z-210330T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Jacksonville FL
851 AM EDT Tue Mar 30 2021

The National Weather Service in Jacksonville has issued a

* Flash Flood Warning for...
  Northeastern Bradford County in northern Florida...

* Until 1100 AM EDT.

* At 851 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 3 and 5 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Starke, Sampson and New River.

Additional rainfall amounts of 1 to 2 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.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, country roads, farmland, and other low lying 
spots.

&&

LAT...LON 2985 8227 2984 8227 2986 8231 2991 8233
      2996 8228 3000 8222 3005 8214 3003 8205
      3002 8205 3000 8205 2998 8205 2992 8205
      2989 8214 2985 8226

FLASH FLOOD...RADAR INDICATED

$$

HESS

1 follow-up statement

151 
WGUS72 KJAX 301407
FFSJAX

Flash Flood Statement
National Weather Service Jacksonville FL
1007 AM EDT Tue Mar 30 2021

FLC007-301417-
/O.CAN.KJAX.FF.W.0001.000000T0000Z-210330T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bradford FL-
1007 AM EDT Tue Mar 30 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHEASTERN BRADFORD 
COUNTY...

The heavy rain has ended. Flash flooding is no longer expected to 
pose a threat. Please heed any road closures and never drive into 
flooded roadways.

LAT...LON 2985 8227 2984 8227 2986 8231 2991 8233
      2996 8228 3000 8222 3005 8214 3003 8205
      3002 8205 3000 8205 2998 8205 2992 8205
      2989 8214 2985 8226

$$

JAX

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 30, 2:07 AM EDT	Special Weather Statement	JAX	Gilchrist	38 min
Mar 30, 5:08 AM EDT	Special Weather Statement	JAX	Bradford	37 min
Mar 30, 5:28 AM EDT	Special Weather Statement	JAX	Bradford, Clay, Union	47 min
Mar 30, 5:57 AM EDT	Special Weather Statement	JAX	Bradford, Clay	48 min
Mar 30, 6:37 AM EDT	Special Weather Statement	JAX	Bradford, Clay	53 min
Mar 30, 6:43 AM EDT	Special Weather Statement	JAX	Gilchrist	47 min
Mar 30, 7:33 AM EDT	Special Weather Statement	JAX	Bradford, Gilchrist, Union	57 min
Mar 30, 8:02 AM EDT	Areal Flood Warning	JAX	Bradford	3 hr
Mar 30, 10:52 AM EDT	Special Weather Statement	JAX	Suwannee	38 min
Mar 30, 5:27 PM EDT	Special Weather Statement	JAX	Gilchrist	48 min
Mar 30, 5:53 PM EDT	Special Weather Statement	JAX	Marion	52 min
Mar 30, 6:00 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Marion	45 min
Mar 30, 6:16 PM EDT	Areal Flood Warning	JAX	Marion	119 min
Mar 30, 6:39 PM EDT	Special Weather Statement	JAX	Marion	51 min
Mar 30, 6:45 PM EDT	Severe Thunderstorm Warning	JAX	Marion	16 min
Mar 30, 6:52 PM EDT	Special Weather Statement	JAX	Alachua	38 min
Mar 30, 7:01 PM EDT	Areal Flood Warning	JAX	Alachua	89 min
Mar 30, 7:27 PM EDT	Areal Flood Warning	JAX	Alachua	93 min
Mar 30, 7:29 PM EDT	Special Weather Statement	JAX	Alachua	46 min

Nearby

Flash Flood Warnings in Florida, 2021 Every flash flood warning in 2021

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.