Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 147, NWS Miami, FL

September 6, 2012Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Sep 6, 2012, 3:32 PM EDT for Palm Beach County, Florida. It was in force for 43 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: Sep 6, 2012, 3:32 PM EDT (19:32 UTC)
Expired: Sep 6, 2012, 4:15 PM EDT
In force: 43 min
Issued by: NWS Miami, FL
Area: Storm-based polygon

County Palm Beach County, FL

The radar

The Miami radar (KAMX), 95 km from the middle of the area, began a volume at 19:34 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 12:00Z, 7.5 hours before the alert went out and 76 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: 2065 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 806 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 9 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.

267 
WUUS52 KMFL 061932
SVRMFL
FLC099-062015-
/O.NEW.KMFL.SV.W.0147.120906T1932Z-120906T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
332 PM EDT THU SEP 6 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN PALM BEACH COUNTY IN SOUTH FLORIDA.

* UNTIL 415 PM EDT

* AT 330 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  HOLEY LAND WILDLIFE MANAGEMENT AREA...AND MOVING NORTHEAST AT 15
  MPH.

* THE STORM WILL AFFECT...
  OKEELANTA...
  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.

&&

LAT...LON 2633 8055 2633 8074 2658 8085 2671 8055
      2641 8035
TIME...MOT...LOC 1933Z 232DEG 14KT 2643 8068

$$

AK

1 follow-up statement

138 
WWUS52 KMFL 061948
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
348 PM EDT THU SEP 6 2012

FLC099-062015-
/O.CON.KMFL.SV.W.0147.000000T0000Z-120906T2015Z/
PALM BEACH FL-
348 PM EDT THU SEP 6 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR CENTRAL PALM BEACH COUNTY...

AT 343 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS
IN EXCESS OF 70 MPH. THIS STORM WAS LOCATED NEAR HOLEY LAND WILDLIFE 
MANAGEMENT AREA AND U.S. ROUTE 27...MOVING NORTHEAST AT 15 MPH.

SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WINDS IN EXCESS OF 70
MPH...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAINFALL. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. THIS STORM HAS THE POTENTIAL TO CAUSE SERIOUS
INJURY AND SIGNIFICANT DAMAGE TO PROPERTY.

LAT...LON 2640 8039 2634 8056 2633 8065 2634 8073
      2659 8081 2671 8055 2641 8035
TIME...MOT...LOC 1947Z 232DEG 14KT 2646 8063

$$

AK

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 6, 12:53 PM EDT	Special Weather Statement	MFL	Broward	52 min
Sep 6, 2:46 PM EDT	Areal Flood Advisory	MFL	Palm Beach	119 min
Sep 6, 2:58 PM EDT	Special Marine Warning	MFL		92 min
Sep 6, 3:20 PM EDT	Special Weather Statement	MFL	Palm Beach	25 min
Sep 6, 3:40 PM EDT	Special Weather Statement	MFL	Broward	35 min
Sep 6, 4:01 PM EDT	Severe Thunderstorm Warning	MFL	Palm Beach	25 min
Sep 6, 4:10 PM EDT	Special Weather Statement	MFL	Broward	50 min
Sep 6, 4:36 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Palm Beach	24 min
Sep 6, 4:52 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Palm Beach	38 min
Sep 6, 5:33 PM EDT	Special Marine Warning	MFL		36 min
Sep 6, 5:42 PM EDT	Areal Flood Advisory	MFL	Collier	2 hr
Sep 6, 5:47 PM EDT	Areal Flood Advisory	MFL	Glades, Hendry	118 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.