Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 161, NWS Miami, FL

December 11, 20124 counties in Florida

NWS Miami, FL issued this severe thunderstorm warning at Dec 11, 2012, 1:47 AM EST for 4 counties in Florida. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Dec 11, 2012, 1:47 AM EST (06:47 UTC)
Expired: Dec 11, 2012, 2:15 AM EST
In force: 28 min
Issued by: NWS Miami, FL
Area: Storm-based polygon

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

The radar

The Miami radar (KAMX), 49 km from the middle of the area, began a volume at 06:47 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

Miami, FL (KMFL), launched 00:00Z, 6.8 hours before the alert went out and 52 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: 2247 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 560 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

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

384 
WUUS52 KMFL 110647
SVRMFL
FLC011-021-086-087-110715-
/O.NEW.KMFL.SV.W.0161.121211T0647Z-121211T0715Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
147 AM EST TUE DEC 11 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHWESTERN BROWARD COUNTY IN SOUTH FLORIDA.
  NORTHWESTERN MIAMI-DADE COUNTY IN SOUTH FLORIDA.
  SOUTHEASTERN COLLIER COUNTY IN SOUTH FLORIDA.
  NORTHEASTERN MAINLAND MONROE COUNTY IN SOUTH FLORIDA.

* UNTIL 215 AM EST

* AT 147 AM EST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 3 MILES SOUTHEAST OF
  DADE-COLLIER TRAINING AIRPORT...AND MOVING EAST AT 25 MPH.

* THE STORM WILL AFFECT...
  FORTYMILE BEND...
  AND SURROUNDING COMMUNITIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 58 MPH AND
OR LARGE HAIL. FREQUENT TO EXCESSIVE LIGHTNING AND HEAVY RAINFALL IS
ALSO POSSIBLE. IF THE STORM APPROACHES YOUR LOCATION, SEEK SHELTER IN
AN ENCLOSED BUILDING ON THE LOWEST FLOOR AND STAY AWAY FROM WINDOWS.

SEVERE THUNDERSTORMS CAN ALSO PRODUCE TORNADOES WITH LITTLE OR NO
ADVANCE WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN AN INTERIOR
ROOM IN THE LOWEST FLOOR OF YOUR HOUSE OR BUSINESS IF A TORNADO IS
SPOTTED.

&&

LAT...LON 2599 8070 2576 8070 2571 8095 2588 8100
TIME...MOT...LOC 0647Z 255DEG 22KT 2582 8087

$$

CWC

1 follow-up statement

418 
WWUS52 KMFL 110710
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
210 AM EST TUE DEC 11 2012

FLC011-021-086-087-110720-
/O.EXP.KMFL.SV.W.0161.000000T0000Z-121211T0715Z/
MAINLAND MONROE FL-BROWARD FL-COLLIER FL-MIAMI-DADE FL-
210 AM EST TUE DEC 11 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MIAMI-DADE...
SOUTHEASTERN COLLIER...EXTREME SOUTHWESTERN BROWARD AND NORTHEASTERN
MAINLAND MONROE COUNTIES WILL EXPIRE AT 215 AM EST...

NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE THUNDERSTORM HAS
MOVED OUT OF THE WARNED AREA. THUS THE THUNDERSTORM WARNING WILL
EXPIRE AT 215 AM EST.

LAT...LON 2599 8070 2576 8070 2571 8095 2588 8100
TIME...MOT...LOC 0710Z 255DEG 22KT 2586 8072

$$

CWC

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 10, 11:40 PM EST	Areal Flood Advisory	MFL	Collier	2 hr
Dec 10, 11:45 PM EST	Special Marine Warning	MFL		60 min
Dec 11, 12:02 AM EST	Special Weather Statement	MFL	Collier	43 min
Dec 11, 12:34 AM EST	Special Weather Statement	MFL	Collier	41 min
Dec 11, 1:12 AM EST	Special Weather Statement	MFL	Monroe	48 min
Dec 11, 1:31 AM EST	Severe Thunderstorm Warning	MFL	Broward, Collier, Miami-Dade, Monroe	29 min
Dec 11, 1:59 AM EST	Special Weather Statement	MFL	Broward	31 min
Dec 11, 2:09 AM EST	Special Weather Statement	MFL	Miami-Dade	51 min
Dec 11, 3:12 AM EST	Special Weather Statement	MFL	Broward	48 min
Dec 11, 3:47 AM EST	Special Marine Warning	MFL		58 min
Dec 11, 4:52 AM EST	Areal Flood Advisory	MFL	Collier	113 min
Dec 11, 6:29 AM EST	Special Weather Statement	MFL	Hendry	46 min
Dec 11, 8:53 AM EST	Areal Flood Advisory	MFL	Collier	112 min
Dec 11, 9:13 AM EST	Special Marine Warning	MFL		32 min
Dec 11, 9:15 AM EST	Special Weather Statement	MFL	Collier	45 min
Dec 11, 9:40 AM EST	Special Marine Warning	MFL		95 min
Dec 11, 10:06 AM EST	Special Weather Statement	MFL	Collier	39 min
Dec 11, 6:08 PM EST	Areal Flood Advisory	MFL	Palm Beach	112 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012 Every severe thunderstorm warning in 2012

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.