Alert archive / Florida / Flash Flood Warnings in 2011

Flash Flood Warning 16, NWS Mobile, AL

March 9, 2011Santa Rosa County, Florida

NWS Mobile, AL issued this flash flood warning at Mar 9, 2011, 10:17 AM CST for Santa Rosa 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: Mar 9, 2011, 10:17 AM CST (16:17 UTC)
Expired: Mar 9, 2011, 4:15 PM CST
In force: 6 hr
Issued by: NWS Mobile, AL
Area: Storm-based polygon
Flood severity: None

County Santa Rosa County, FL

The radar

The Eglin Afb radar (KEVX), 107 km from the middle of the area, began a volume at 16:16 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.3 hours before the alert went out and 258 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: 1220 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 456 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 499 m²/s²
0-3 km storm-relative helicity: 571 m²/s²
Significant tornado parameter: 4.3
Supercell composite: 19.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

043 
WGUS54 KMOB 091617
FFWMOB
FLC113-092215-
/O.NEW.KMOB.FF.W.0016.110309T1617Z-110309T2215Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1017 AM CST WED MAR 9 2011

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SANTA ROSA COUNTY IN NORTHWEST FLORIDA...
  THIS INCLUDES THE CITIES OF...MILTON...BAGDAD...

* UNTIL 415 PM CST

* AT 1012 AM CST...NATIONAL WEATHER SERVICE RADAR INDICATED VERY
  HEAVY RAIN FROM A LINE OF THUNDERSTORMS MOVING ACROSS SANTA ROSA
  COUNTY.  THESE STORMS HAVE BEEN PRODUCING AS MUCH AS 3 INCHES OF
  RAIN IN A SHORT AMOUNT OF TIME...AND ADDITIONAL RAINFALL AMOUNTS
  OF 2 TO 3 INCHES WILL OCCUR AS STORMS CONTINUE TO MOVE ACROSS THE
  AREA.  THIS WILL QUICKLY RESULT IN FLASH FLOODING.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

TO REPORT FLASH FLOODING TO YOUR NATIONAL WEATHER SERVICE...CALL TOLL
FREE AT 1 8 7 7 6 3 3 6 7 7 2.

LAT...LON 3052 8710 3054 8714 3057 8715 3058 8716
      3100 8712 3100 8678 3053 8679 3051 8703
      3052 8703 3055 8701 3055 8703 3050 8704
      3050 8710

$$

2 follow-up statements

127 
WGUS74 KMOB 092108
FFSMOB

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
308 PM CST WED MAR 9 2011

FLC113-092215-
/O.CON.KMOB.FF.W.0016.000000T0000Z-110309T2215Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SANTA ROSA FL-
308 PM CST WED MAR 9 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM CST FOR SANTA
ROSA COUNTY...

AT 304 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES 
THAT 3 TO 4 INCHES OF RAIN FELL OVER MUCH OF THE AREA WITH AMOUNTS 
AROUND 4 INCHES AFFECTING THE SOUTHERN PORTION OF THE COUNTY.  THE 
FLASH FLOOD WARNING CONTINUES IN EFFECT UNTIL THE HEAVY RAINS 
FINISHING DRAINING OFF.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 3052 8710 3054 8714 3057 8715 3058 8716
      3100 8712 3100 8678 3053 8679 3051 8703
      3052 8703 3055 8701 3055 8703 3050 8704
      3050 8710

$$

434 
WGUS74 KMOB 092215
FFSMOB

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
415 PM CST WED MAR 9 2011

FLC113-092225-
/O.EXP.KMOB.FF.W.0016.000000T0000Z-110309T2215Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SANTA ROSA FL-
415 PM CST WED MAR 9 2011

...THE FLASH FLOOD WARNING HAS EXPIRED FOR SANTA ROSA COUNTY...

AT 413 PM CST...REPORTS FROM EMERGENCY MANAGEMENT AND LOCAL LAW 
ENFORCEMENT INDICATE THAT ANY AREAS THAT FLOODED HAVE SINCE 
SUBSIDED...THUS THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO 
EXPIRE.

LAT...LON 3052 8710 3054 8714 3057 8715 3058 8716
      3100 8712 3100 8678 3053 8679 3051 8703
      3052 8703 3055 8701 3055 8703 3050 8704
      3050 8710

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 9, 9:02 AM CST	Severe Thunderstorm Warning	MOB	Escambia, Santa Rosa	58 min
Mar 9, 9:10 AM CST	Severe Thunderstorm Warning	MOB	Okaloosa, Santa Rosa	65 min
Mar 9, 9:10 AM CST	Tornado Warning	MOB	Escambia	50 min
Mar 9, 9:16 AM CST	Tornado Warning	MOB	Escambia	44 min
Mar 9, 9:25 AM CST	Flash Flood Warning	MOB	Escambia, Santa Rosa	6 hr
Mar 9, 9:26 AM CST	Tornado Warning	MOB	Escambia, Santa Rosa	49 min
Mar 9, 9:40 AM CST	Tornado Warning	MOB	Escambia, Santa Rosa	50 min
Mar 9, 10:09 AM CST	Severe Thunderstorm Warning	MOB	Escambia, Okaloosa, Santa Rosa	66 min
Mar 9, 10:30 AM CST	Tornado Warning	MOB	Okaloosa, Santa Rosa	32 min
Mar 9, 11:03 AM CST	Flash Flood Warning	MOB	Okaloosa	5 hr
Mar 9, 11:10 AM CST	Severe Thunderstorm Warning	MOB	Okaloosa	65 min
Mar 9, 11:14 AM CST	Tornado Warning	MOB	Escambia, Santa Rosa	61 min
Mar 9, 11:41 AM CST	Tornado Warning	MOB	Okaloosa	26 min
Mar 9, 11:48 AM CST	Flash Flood Warning	MOB	Okaloosa, Santa Rosa	4 hr
Mar 9, 12:16 PM CST	Tornado Warning	MOB	Okaloosa, Santa Rosa	26 min

Nearby

Flash Flood Warnings in Florida, 2011 Every flash flood warning in 2011

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.