Alert archive / Florida / Mesoscale Discussions in 2006

Mesoscale Discussion 1908

August 29, 2006Broward County, Miami-Dade County, Monroe County, Florida

The Storm Prediction Center issued this mesoscale discussion at Aug 29, 2006, 2:18 PM EDT for Broward County, Miami-Dade County, Monroe County, Florida. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Aug 29, 2006, 2:18 PM EDT (18:18 UTC)
Expired: Aug 29, 2006, 3:45 PM EDT
In force: 87 min
Issued by: the Storm Prediction Center

Counties Broward County, FL, Miami-Dade County, FL, Monroe County, FL

The radar

The Miami radar (KAMX), 38 km from the middle of the area, began a volume at 18:22 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 758Aug 29, 4:45 PM EDT

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 6.3 hours before the alert went out and 64 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: 985 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 921 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
ACUS11 KWNS 291819
SWOMCD
SPC MCD 291818 
FLZ000-291945-

MESOSCALE DISCUSSION 1908
NWS STORM PREDICTION CENTER NORMAN OK
0118 PM CDT TUE AUG 29 2006

AREAS AFFECTED...FL KEYS AND SRN FL PENINSULA

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 

VALID 291818Z - 291945Z

AN ISOLATED TORNADO THREAT WILL LIKELY DEVELOP OVER THE NEXT 2 TO 4
HOURS ACROSS SRN FL AND THE FL KEYS. A TORNADO WATCH MAY BECOME
NECESSARY LATER THIS AFTERNOON.

TROPICAL STORM ERNESTO IS CURRENTLY LOCATED ABOUT 125 STATUTE MILES
EAST SOUTHEAST OF THE KEY WEST FL WITH THE CENTER MOVING NORTHWEST
ATTM ...REF HURRICANE CENTER ADVISORY 20. THE CENTER WILL APPROACH
THE SRN FL COAST WHERE MODERATE DESTABILIZATION HAS OCCURRED WITH
MLCAPE VALUES IN THE 1000 TO 1500 J/KG RANGE. IN ADDITION...A 35-40
KT LOW-LEVEL JET IS LOCATED EAST AND NORTHEAST OF THE TROPICAL STORM
CENTER. AS THE LOW-LEVEL JET MOVES TOWARD SRN FL LATE THIS
AFTERNOON...LOW-LEVEL SHEAR PROFILES WILL INCREASE AND MAY BECOME
FAVORABLE FOR AN ISOLATED TORNADO THREAT. THE GREATEST TORNADO
THREAT SHOULD EXIST ACROSS THE ERN FL KEYS AND ACROSS THE ERN COAST
OF SRN FL AS THE STRONGER BANDS CLOSER TO AND NORTHEAST OF THE
CENTER OF TROPICAL STORM ERNESTO MOVE INLAND.

..BROYLES.. 08/29/2006

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...MFL...KEY...

24658003 24538138 25258205 25668189 26238105 26387980
25447906

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 29, 4:44 PM EDT	Tornado Watch	SPC	Broward, Collier, Glades, Hendry, Martin, Miami-Dade and 4 more	9 hr

Nearby

Mesoscale Discussions in Florida, 2006 Every mesoscale discussion in 2006

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.