Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 34, NWS Miami, FL

May 18, 2012Broward County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 18, 2012, 3:58 PM EDT for Broward County, Florida. It was in force for 18 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 18, 2012, 3:58 PM EDT (19:58 UTC)
Expired: May 18, 2012, 4:16 PM EDT
In force: 18 min
Issued by: NWS Miami, FL
Area: Storm-based polygon

County Broward County, FL

The radar

The Miami radar (KAMX), 66 km from the middle of the area, began a volume at 19:59 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.

What was reported inside it

Time	Report	Where	Remark
May 18, 3:58 PM EDT	TSTM WND GST 50	Fort Lauderdale, FL	A THUNDERSTORM PRODUCED A WIND GUST OF 50 MPH JUST NORTHWEST OF DOWNTOWN FORT LAUDERDALE.
May 18, 3:58 PM EDT	TSTM WND GST 57	Fort Lauderdale, FL	A THUNDERSTORM PRODUCED A WIND GUST OF 57 MPH JUST WEST OF DOWNTOWN FORT LAUDERDALE.
May 18, 4:07 PM EDT	TSTM WND GST 54	Fort Lauderdale, FL	A THUNDERSTORM PRODUCED A WIND GUST OF 54 MPH AT BROWARD GENERAL HOSPITAL IN FORT LAUDERDALE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 8.0 hours before the alert went out and 40 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: 1355 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 572 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

922 
WUUS52 KMFL 181958
SVRMFL
FLC011-182030-
/O.NEW.KMFL.SV.W.0034.120518T1958Z-120518T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
358 PM EDT FRI MAY 18 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL BROWARD COUNTY IN SOUTH FLORIDA.

* UNTIL 430 PM EDT

* AT 354 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR FORT LAUDERDALE...AND
  MOVING EAST AT 10 MPH.

* THE STORM WILL AFFECT...
  FORT LAUDERDALE...
  PORT EVERGLADES...
  LAUDERDALE BY THE SEA...
  AND SURROUNDING COMMUNITIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE VERY STRONG WINDS IN EXCESS OF 58
MPH...DEADLY LIGHTNING...AND VERY HEAVY RAINFALL. STAY INSIDE AWAY
FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 2617 8009 2615 8010 2613 8009 2602 8011
      2604 8027 2626 8025 2625 8008
TIME...MOT...LOC 1958Z 267DEG 10KT 2613 8014

$$

AK

2 follow-up statements

542 
WWUS52 KMFL 182008
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
408 PM EDT FRI MAY 18 2012

FLC011-182030-
/O.CON.KMFL.SV.W.0034.000000T0000Z-120518T2030Z/
BROWARD FL-
408 PM EDT FRI MAY 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR EAST CENTRAL BROWARD COUNTY...

AT 403 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR PORT 
EVERGLADES...MOVING EAST AT 10 MPH.  

SEVERE THUNDERSTORMS CAN PRODUCE VERY STRONG WINDS IN EXCESS OF 58
MPH...LARGE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAINFALL. STAY
INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 2616 8025 2617 8010 2617 8009 2615 8010
      2613 8009 2602 8011 2604 8027
TIME...MOT...LOC 2007Z 283DEG 9KT 2610 8013

$$

AK

341 
WWUS52 KMFL 182016
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
416 PM EDT FRI MAY 18 2012

FLC011-182026-
/O.CAN.KMFL.SV.W.0034.000000T0000Z-120518T2030Z/
BROWARD FL-
416 PM EDT FRI MAY 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BROWARD COUNTY IS
CANCELLED...

NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE THUNDERSTORM HAS
MOVED OUT OF THE WARNED AREA. THUS THE THUNDERSTORM WARNING HAS BEEN
CANCELLED.

LAT...LON 2616 8025 2617 8010 2617 8009 2615 8010
      2613 8009 2602 8011 2604 8027
TIME...MOT...LOC 2016Z 284DEG 7KT 2612 8009

$$

AK

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 8:02 PM EDT	Special Weather Statement	MFL	Palm Beach	28 min
May 17, 8:52 PM EDT	Special Weather Statement	MFL	Palm Beach	38 min
May 17, 9:14 PM EDT	Special Marine Warning	MFL		61 min
May 17, 9:20 PM EDT	Areal Flood Advisory	MFL	Palm Beach	76 min
May 17, 9:30 PM EDT	Special Weather Statement	MFL	Palm Beach	30 min
May 18, 1:16 PM EDT	Special Weather Statement	MFL	Broward	29 min
May 18, 1:26 PM EDT	Special Weather Statement	MFL	Miami-Dade	49 min
May 18, 1:29 PM EDT	Special Marine Warning	MFL		61 min
May 18, 1:45 PM EDT	Special Marine Warning	MFL		60 min
May 18, 1:46 PM EDT	Special Weather Statement	MFL	Palm Beach	29 min
May 18, 1:49 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Palm Beach	26 min
May 18, 1:52 PM EDT	Severe Thunderstorm Warning	MFL	Miami-Dade	38 min
May 18, 2:07 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Palm Beach	23 min
May 18, 2:08 PM EDT	Severe Thunderstorm Warning	MFL	Miami-Dade	37 min
May 18, 2:18 PM EDT	Special Weather Statement	MFL	Palm Beach	12 min
May 18, 2:25 PM EDT	Special Marine Warning	MFL		95 min
May 18, 2:28 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Miami-Dade	26 min
May 18, 2:36 PM EDT	Special Marine Warning	MFL		54 min
May 18, 2:40 PM EDT	Special Weather Statement	MFL	Miami-Dade	35 min
May 18, 2:44 PM EDT	Special Weather Statement	MFL	Broward	46 min
May 18, 2:53 PM EDT	Special Weather Statement	MFL	Broward	37 min
May 18, 3:23 PM EDT	Areal Flood Advisory	MFL	Broward	112 min
May 18, 3:28 PM EDT	Special Weather Statement	MFL	Broward	32 min
May 18, 3:33 PM EDT	Special Marine Warning	MFL		87 min
May 18, 3:39 PM EDT	Special Weather Statement	MFL	Broward	51 min
May 18, 3:43 PM EDT	Special Weather Statement	MFL	Palm Beach	47 min
May 18, 4:05 PM EDT	Special Weather Statement	MFL	Hendry	40 min
May 18, 4:14 PM EDT	Special Marine Warning	MFL		91 min
May 18, 4:14 PM EDT	Severe Thunderstorm Warning	MFL	Hendry, Palm Beach	46 min
May 18, 4:18 PM EDT	Special Weather Statement	MFL	Broward	42 min
May 18, 4:39 PM EDT	Special Marine Warning	MFL		81 min
May 18, 5:02 PM EDT	Special Weather Statement	MFL	Miami-Dade	28 min
May 18, 5:09 PM EDT	Special Marine Warning	MFL		81 min
May 18, 5:32 PM EDT	Special Weather Statement	MFL	Hendry	28 min
May 18, 5:58 PM EDT	Special Marine Warning	MFL		62 min
May 18, 6:17 PM EDT	Special Marine Warning	MFL		58 min
May 18, 6:31 PM EDT	Special Weather Statement	MFL	Miami-Dade	29 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.