Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 17, NWS Miami, FL

May 10, 2012Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 10, 2012, 9:34 PM EDT for Palm Beach County, Florida. It was in force for 26 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: May 10, 2012, 9:34 PM EDT (01:34 UTC)
Expired: May 10, 2012, 10:00 PM EDT
In force: 26 min
Issued by: NWS Miami, FL
Area: Storm-based polygon

County Palm Beach County, FL

The radar

The Melbourne radar (KMLB), 138 km from the middle of the area, began a volume at 01:35 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, 1.6 hours before the alert went out and 120 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: 1569 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 1127 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

163 
WUUS52 KMFL 110134
SVRMFL
FLC099-110200-
/O.NEW.KMFL.SV.W.0017.120511T0134Z-120511T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
934 PM EDT THU MAY 10 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

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

* UNTIL 1000 PM EDT

* AT 933 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED OVER EXTREME NORTH CENTRAL PALM
  BEACH COUNTY...AND MOVING NORTHEAST AT 10 MPH.

* THE STORM WILL AFFECT...
  RURAL NORTHERN PALM BEACH COUNTY
  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 2681 8032 2690 8049 2696 8046 2696 8024
      2696 8021
TIME...MOT...LOC 0134Z 210DEG 9KT 2694 8036

$$

GARCIA

1 follow-up statement

319 
WWUS52 KMFL 110156
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
956 PM EDT THU MAY 10 2012

FLC099-110206-
/O.EXP.KMFL.SV.W.0017.000000T0000Z-120511T0200Z/
PALM BEACH FL-
956 PM EDT THU MAY 10 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL PALM BEACH
COUNTY WILL EXPIRE AT 1000 PM EDT...

NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE THUNDERSTORM HAS
MOVED OUT OF THE WARNED AREA. THUS THE THUNDERSTORM WARNING WILL
EXPIRE AT 1000 PM EDT.

LAT...LON 2681 8032 2690 8049 2696 8046 2696 8024
      2696 8021
TIME...MOT...LOC 0156Z 210DEG 9KT 2699 8033

$$

GARCIA

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 8:53 PM EDT	Special Weather Statement	MFL	Palm Beach	52 min
May 10, 9:20 PM EDT	Special Weather Statement	MFL	Martin	40 min
May 10, 9:40 PM EDT	Special Weather Statement	MFL	Broward	50 min
May 11, 12:49 PM EDT	Special Marine Warning	MFL		26 min
May 11, 3:25 PM EDT	Special Marine Warning	MFL		50 min
May 11, 4:43 PM EDT	Special Weather Statement	MFL	Broward	32 min
May 11, 6:42 PM EDT	Areal Flood Advisory	MFL	Collier	2 hr

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.