Alert archive / Florida / Flash Flood Warnings in 2018

Flash Flood Warning 9, NWS Mobile, AL

May 28, 2018Okaloosa County, Florida

NWS Mobile, AL issued this flash flood warning at May 28, 2018, 2:51 PM CDT for Okaloosa County, Florida. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 28, 2018, 2:51 PM CDT (19:51 UTC)
Expired
May 28, 2018, 8:45 PM CDT
In force
6 hr
Issued by
NWS Mobile, AL
Area
Storm-based polygon
Flood severity
None

County Okaloosa County, FL

The radar

The Eglin Afb radar (KEVX), 65 km from the middle of the area, began a volume at 19:52 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 7.9 hours before the alert went out and 220 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-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 12:00Z on 2018-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 843 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 12:00Z on 2018-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 194 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
843 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
510 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
194 m²/s²
0-3 km storm-relative helicity
199 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.4

Open this sounding in Storm Lab

The text

As transmitted.

652 
WGUS54 KMOB 281951
FFWMOB
FLC091-290145-
/O.NEW.KMOB.FF.W.0009.180528T1951Z-180529T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mobile AL
251 PM CDT MON MAY 28 2018

The National Weather Service in Mobile has issued a

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

* Until 845 PM CDT.

* At 245 PM CDT, Doppler radar indicated a band of very heavy rain 
  associated with Subtropical Storm Alberto moving into eastern 
  Okaloosa County. Radar estimates rainfall amounts around 2 inches 
  per hour in this band. Flash flooding is expected to begin shortly 
  as this band rotates slowly westward across the county.

* Some locations that will experience flooding include...
  Wright, Fort Walton Beach, Crestview, Niceville, Destin, Eglin AFB,
  Valparaiso, Mary Esther, Ocean City, Lake Lorraine, Baker, Shalimar
  and Cinco Bayou.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3037 8680 3083 8678 3080 8640 3040 8639
      3035 8640

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 8:08 PM CDTRiver Flood WarningMOBEscambia38 hr
May 28, 10:05 AM CDTWind AdvisoryMOBEscambia8 hr
May 28, 10:11 AM CDTCoastal Flood AdvisoryMOBOkaloosa, Santa Rosa9 hr
May 28, 5:02 PM CDTFlash Flood WarningMOBOkaloosa6 hr

Nearby

Flash Flood Warnings in Florida, 2018Every flash flood warning in 2018

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.