Alert archive / Florida / Flash Flood Warnings in 2021

Flash Flood Warning 12, NWS Mobile, AL

April 10, 2021Okaloosa County, Florida

NWS Mobile, AL issued this flash flood warning at Apr 10, 2021, 7:39 AM CDT for Okaloosa County, Florida. It was in force for 5 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: Apr 10, 2021, 7:39 AM CDT (12:39 UTC)
Expired: Apr 10, 2021, 12:51 PM CDT
In force: 5 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Okaloosa County, FL

The radar

The Eglin Afb radar (KEVX), 76 km from the middle of the area, began a volume at 12:39 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
Apr 10, 8:50 AM CDT	FLASH FLOOD	1 Nw Wright, FL	FLOODING AT GREEN ACRES BLVD AND GREEN ACRES RD IN THE FT WALTON AREA. REPORT VIA SOCIAL MEDIA.

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, 0.7 hours before the alert went out and 232 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: 13 J/kg
Mixed-layer CIN: -541 J/kg
Mixed-layer LCL: 1046 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 276 m²/s²
0-3 km storm-relative helicity: 231 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

411 
WGUS54 KMOB 101239
FFWMOB
FLC091-101845-
/O.NEW.KMOB.FF.W.0012.210410T1239Z-210410T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
739 AM CDT Sat Apr 10 2021

The National Weather Service in Mobile has issued a

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

* Until 145 PM CDT Saturday.

* At 739 AM CDT, 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...Radar.

  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...
  Wright, Fort Walton Beach, Crestview, Niceville, Destin, Eglin 
  AFB, Valparaiso, Mary Esther, Lake Lorraine, Ocean City, Baker, 
  Shalimar, Laurel Hill, Cinco Bayou, Milligan, Galliver, Silver 
  Springs, Killingsworth Crossroads, Auburn and Holt.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3039 8682 3041 8682 3041 8680 3098 8678
      3098 8639 3036 8639 3037 8683 3039 8680

FLASH FLOOD...RADAR INDICATED

$$

1 follow-up statement

190 
WGUS74 KMOB 101751
FFSMOB

Flash Flood Statement
National Weather Service Mobile AL
1251 PM CDT Sat Apr 10 2021

FLC091-101801-
/O.CAN.KMOB.FF.W.0012.000000T0000Z-210410T1845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Okaloosa FL-
1251 PM CDT Sat Apr 10 2021

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

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

LAT...LON 3039 8682 3041 8682 3041 8680 3098 8678
      3098 8639 3036 8639 3037 8683 3039 8680

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 2:50 AM CDT	Severe Thunderstorm Warning	MOB	Escambia	55 min
Apr 10, 2:59 AM CDT	Severe Thunderstorm Warning	MOB	Escambia	61 min
Apr 10, 3:46 AM CDT	Special Weather Statement	MOB	Escambia, Santa Rosa	44 min
Apr 10, 3:53 AM CDT	Severe Thunderstorm Warning	MOB	Escambia, Santa Rosa	67 min
Apr 10, 4:07 AM CDT	Areal Flood Advisory	MOB	Escambia	3 hr
Apr 10, 4:30 AM CDT	Special Weather Statement	MOB	Okaloosa	45 min
Apr 10, 4:53 AM CDT	Severe Thunderstorm Warning	MOB	Escambia, Okaloosa, Santa Rosa	52 min
Apr 10, 5:10 AM CDT	Areal Flood Advisory	MOB	Escambia, Santa Rosa	3 hr
Apr 10, 5:40 AM CDT	Flash Flood Warning	MOB	Escambia, Santa Rosa	6 hr
Apr 10, 5:44 AM CDT	Severe Thunderstorm Warning	MOB	Escambia, Okaloosa, Santa Rosa	61 min
Apr 10, 5:57 AM CDT	Tornado Warning	MOB	Okaloosa	33 min
Apr 10, 6:18 AM CDT	Tornado Warning	MOB	Okaloosa	12 min
Apr 10, 6:20 AM CDT	Severe Thunderstorm Warning	MOB	Escambia	40 min
Apr 10, 6:52 AM CDT	Severe Thunderstorm Warning	MOB	Escambia, Okaloosa, Santa Rosa	53 min
Apr 10, 7:35 AM CDT	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	41 min
Apr 10, 9:38 AM CDT	River Flood Warning	MOB	Okaloosa	11 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; radar from the NEXRAD Level II archive.