Alert archive / Florida / Flash Flood Warnings in 2011

Flash Flood Warning 7, NWS Miami, FL

October 31, 2011Broward County, Florida

NWS Miami, FL issued this flash flood warning at Oct 31, 2011, 2:26 AM EDT for Broward County, Florida. It was in force for 3 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
Oct 31, 2011, 2:26 AM EDT (06:26 UTC)
Expired
Oct 31, 2011, 5:30 AM EDT
In force
3 hr
Issued by
NWS Miami, FL
Area
Storm-based polygon
Flood severity
None

County Broward County, FL

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 6.4 hours before the alert went out and 47 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, Miami, FL at 00:00Z on 2011-10-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 860 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Miami, FL at 00:00Z on 2011-10-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
860 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
505 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
118 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.5

Open this sounding in Storm Lab

The text

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

646 
WGUS52 KMFL 310626
FFWMFL
FLC011-310930-
/O.NEW.KMFL.FF.W.0007.111031T0626Z-111031T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MIAMI FL
226 AM EDT MON OCT 31 2011

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN BROWARD COUNTY IN SOUTHEAST FLORIDA...

* UNTIL 530 AM EDT

* AT 222 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN
  AREA OF TORRENTIAL RAINFALL OCCURRING FROM PLANTATION TO NORTH
  LAUDERDALE TO THE MARGATE AND COCONUT CREEK AREA AND EAST TO 
  POMPANO BEACH. RAINFALL RATES OF 2 TO 4 INCHES PER HOUR...ON ALREADY
  SATURATED GROUND...WILL LEAD TO FLASH FLOODING. SOME ROADS ARE 
  EXPECTED TO BECOME IMPASSABLE. FLOOD WATERS COULD ENTER HOMES OR 
  BUSINESSES.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...CORAL
  SPRINGS...DEERFIELD BEACH...MARGATE...PLANTATION...POMPANO BEACH...
  SUNRISE...TAMARAC...COCONUT CREEK...HILLSBORO BEACH...LAUDERHILL...
  LIGHTHOUSE POINT...NORTH LAUDERDALE AND PARKLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. WITH FLOODED ROADWAYS AND THE NUMEROUS CANALS 
ACROSS SOUTH FLORIDA...IT CAN BE DIFFICULT TO DETERMINE WHERE THE 
ROAD ENDS AND WHERE THE CANAL BEGINS.

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. WHEN ENCOUNTERING FLOODED ROADS MAKE THE 
SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 2626 8007 2621 8008 2620 8009 2621 8019
      2611 8022 2611 8027 2632 8031 2631 8007

$$

GREGORIA
1 follow-up statement
934 
WGUS72 KMFL 310658
FFSMFL

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
258 AM EDT MON OCT 31 2011

FLC011-310930-
/O.CON.KMFL.FF.W.0007.000000T0000Z-111031T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BROWARD FL-
258 AM EDT MON OCT 31 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 AM EDT FOR
NORTHEASTERN BROWARD COUNTY...

AT 253 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE TORRENTIAL RAIN OCCURRING FROM COCONUT CREEK TO POMPANO
BEACH...WITH RAINFALL RATES OF 4 INCHES PER HOUR OBSERVED. THE RAIN
HAS TAPERED OFF FURTHER WEST FROM PLANTATION TO CORAL SPRINGS 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HILLSBORO
BEACH...POMPANO BEACH...PARKLAND...NORTH LAUDERDALE...MARGATE...
LIGHTHOUSE POINT...DEERFIELD BEACH...CORAL SPRINGS AND COCONUT CREEK

SOME ROADS ARE LIKELY IMPASSABLE. FLOOD WATERS COULD ENTER HOMES OR 
BUSINESSES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. WITH FLOODED ROADWAYS AND THE NUMEROUS CANALS 
ACROSS SOUTH FLORIDA...IT CAN BE DIFFICULT TO DETERMINE WHERE THE 
ROAD ENDS AND WHERE THE CANAL BEGINS.

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. WHEN ENCOUNTERING FLOODED ROADS MAKE THE 
SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 2626 8007 2621 8008 2620 8009 2621 8019
      2611 8022 2611 8027 2632 8031 2631 8007

$$

GREGORIA

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 30, 8:02 PM EDTSpecial Marine WarningMFL43 min
Oct 30, 8:13 PM EDTSpecial Weather StatementMFLMiami-Dade47 min
Oct 30, 8:14 PM EDTFlash Flood WarningMFLMiami-Dade3 hr
Oct 30, 8:26 PM EDTTornado WarningMFLMiami-Dade34 min
Oct 30, 8:44 PM EDTSpecial Marine WarningMFL46 min
Oct 30, 8:55 PM EDTTornado WarningMFLMiami-Dade23 min
Oct 30, 9:31 PM EDTSpecial Marine WarningMFL44 min
Oct 30, 10:12 PM EDTAreal Flood AdvisoryMFLBroward2 hr
Oct 30, 10:31 PM EDTFlash Flood WarningMFLMiami-Dade6 hr
Oct 31, 12:07 AM EDTAreal Flood AdvisoryMFLBroward4 hr
Oct 31, 1:27 AM EDTFlash Flood WarningMFLBroward3 hr
Oct 31, 1:47 AM EDTSpecial Marine WarningMFL58 min
Oct 31, 4:21 AM EDTFlash Flood WarningMFLMiami-Dade5 hr
Oct 31, 4:29 AM EDTRip Current StatementMFLBroward, Miami-Dade, Palm Beach4 days
Oct 31, 4:31 AM EDTFlash Flood WarningMFLBroward5 hr
Oct 31, 8:32 AM EDTSpecial Marine WarningMFL28 min
Oct 31, 8:59 AM EDTAreal Flood WarningMFLMiami-Dade3 hr
Oct 31, 9:06 AM EDTAreal Flood WarningMFLBroward3 hr
Oct 31, 12:01 PM EDTFlash Flood WarningMFLMiami-Dade5 hr
Oct 31, 12:16 PM EDTFlash Flood WarningMFLBroward6 hr
Oct 31, 1:35 PM EDTSpecial Weather StatementMFLBroward40 min
Oct 31, 2:08 PM EDTSpecial Weather StatementMFLBroward52 min
Oct 31, 2:54 PM EDTAreal Flood AdvisoryMFLBroward111 min
Oct 31, 4:55 PM EDTFlash Flood WarningMFLMiami-Dade4 hr
Oct 31, 5:50 PM EDTAreal Flood WarningMFLBroward18 hr
Oct 31, 6:48 PM EDTAreal Flood WarningMFLMiami-Dade18 hr

Nearby

Flash Flood Warnings in Florida, 2011Every 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.