Alert archive / Florida / Flash Flood Warnings in 2021

Flash Flood Warning 84, NWS Mobile, AL

September 17, 2021Okaloosa County, Florida

NWS Mobile, AL issued this flash flood warning at Sep 17, 2021, 9:46 AM CDT for Okaloosa County, Florida. It was in force for 4 hr. 1 report 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 17, 2021, 9:46 AM CDT (14:46 UTC)
Expired: Sep 17, 2021, 1:31 PM CDT
In force: 4 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Okaloosa County, FL

What was reported inside it

Time	Report	Where	Remark
Sep 17, 10:15 AM CDT	FLASH FLOOD	1 Se Destin, FL	SOCIAL MEDIA REPORT OF FLASH FLOODING WITH WATER COVERING ROADWAY ON INDIAN OAKS DR. IN DESTIN, FL.

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

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 2.8 hours before the alert went out and 210 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: 849 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 600 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

964 
WGUS54 KMOB 171446
FFWMOB
FLC091-172045-
/O.NEW.KMOB.FF.W.0084.210917T1446Z-210917T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
946 AM CDT Fri Sep 17 2021

The National Weather Service in Mobile has issued a

* Flash Flood Warning for...
  Southeastern Okaloosa County in northwestern Florida...

* Until 345 PM CDT.

* At 946 AM CDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  1 and 2 inches of rain have fallen. The expected rainfall rate is 
  2 to 3 inches in 1 hour. Additional rainfall amounts of 1 to 3 
  inches are possible in the warned area. Flash flooding is ongoing 
  or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Destin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3039 8655 3039 8654 3043 8651 3040 8639
      3038 8639 3037 8639 3038 8656

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL...2-3 INCHES IN 1 HOUR

$$

MM

3 follow-up statements

847 
WGUS74 KMOB 171533
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
1033 AM CDT Fri Sep 17 2021

FLC091-172045-
/O.CON.KMOB.FF.W.0084.000000T0000Z-210917T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Okaloosa FL-
1033 AM CDT Fri Sep 17 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM CDT THIS 
AFTERNOON FOR SOUTHEASTERN OKALOOSA COUNTY...

At 1033 AM CDT, the public reported thunderstorms producing heavy 
rain across the warned area. Between 1 and 2 inches of rain have 
fallen. Additional rainfall amounts up to 1 inch are possible in the 
warned area. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Public reported.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Destin.

Recent public reports of water covering roadway on Indian Oaks Dr. 
in Destin, FL

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3039 8655 3039 8654 3043 8651 3040 8639
      3038 8639 3037 8639 3038 8656

FLASH FLOOD...OBSERVED

$$

MM

590 
WGUS74 KMOB 171656
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
1156 AM CDT Fri Sep 17 2021

FLC091-172045-
/O.CON.KMOB.FF.W.0084.000000T0000Z-210917T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Okaloosa FL-
1156 AM CDT Fri Sep 17 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 PM CDT THIS 
AFTERNOON FOR SOUTHEASTERN OKALOOSA COUNTY...

At 1156 AM CDT, the public reported thunderstorms producing heavy 
rain across the warned area. Between 1 and 2 inches of rain have 
fallen. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Public reported.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Destin.

Public reports of water covering roadway on Indian Oaks Dr. in 
Destin, FL

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3039 8655 3039 8654 3043 8651 3040 8639
      3038 8639 3037 8639 3038 8656

FLASH FLOOD...OBSERVED

$$

MM

412 
WGUS74 KMOB 171831
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
131 PM CDT Fri Sep 17 2021

FLC091-171841-
/O.CAN.KMOB.FF.W.0084.000000T0000Z-210917T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Okaloosa FL-
131 PM CDT Fri Sep 17 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN OKALOOSA 
COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 700 PM CDT Saturday for 
Portions of Alabama. Portions of northwest Florida. Portions of 
southeast Mississippi.

LAT...LON 3039 8655 3039 8654 3043 8651 3040 8639
      3038 8639 3037 8639 3038 8656

$$

MM

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 17, 5:37 AM CDT	Areal Flood Advisory	MOB	Escambia, Santa Rosa	3 hr
Sep 17, 6:59 AM CDT	Areal Flood Advisory	MOB	Escambia, Santa Rosa	3 hr
Sep 17, 8:27 AM CDT	Areal Flood Advisory	MOB	Okaloosa, Santa Rosa	2 hr
Sep 17, 9:33 AM CDT	Areal Flood Advisory	MOB	Okaloosa	2 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.