Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 45, NWS Miami, FL

May 20, 2012Glades County, Florida

NWS Miami, FL issued this severe thunderstorm warning at May 20, 2012, 10:42 PM EDT for Glades County, Florida. It was in force for 8 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 20, 2012, 10:42 PM EDT (02:42 UTC)
Expired: May 20, 2012, 10:50 PM EDT
In force: 8 min
Issued by: NWS Miami, FL
Area: Storm-based polygon

County Glades County, FL

The radar

The Melbourne radar (KMLB), 111 km from the middle of the area, began a volume at 02:43 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

Tampa Bay, FL (KTBW), launched 00:00Z, 2.7 hours before the alert went out and 161 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2412 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 60 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.

079 
WUUS52 KMFL 210242
SVRMFL
FLC043-210315-
/O.NEW.KMFL.SV.W.0045.120521T0242Z-120521T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
1042 PM EDT SUN MAY 20 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME NORTHEASTERN GLADES COUNTY IN SOUTH FLORIDA.

* UNTIL 1115 PM EDT

* AT 1037 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
  BUCKHEAD RIDGE...AND MOVING NORTHEAST AT 10 MPH.

* THE STORM WILL AFFECT...
  BUCKHEAD RIDGE...
  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 2717 8090 2717 8088 2715 8087 2714 8087
      2712 8089 2711 8090 2710 8090 2708 8093
      2710 8095 2719 8091
TIME...MOT...LOC 0242Z 209DEG 9KT 2713 8089

$$

AK

1 follow-up statement

028 
WWUS52 KMFL 210250
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
1050 PM EDT SUN MAY 20 2012

FLC043-210300-
/O.CAN.KMFL.SV.W.0045.000000T0000Z-120521T0315Z/
GLADES FL-
1050 PM EDT SUN MAY 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME NORTHEASTERN GLADES
COUNTY IS CANCELLED...

NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE THUNDERSTORM HAS 
WEAKENED. THUS THE THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 2717 8090 2717 8088 2715 8087 2714 8087
      2712 8089 2711 8090 2710 8090 2708 8093
      2710 8095 2719 8091
TIME...MOT...LOC 0250Z 209DEG 9KT 2715 8088

$$

AK

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 8:31 PM EDT	Special Weather Statement	MFL	Miami-Dade	29 min
May 20, 8:34 PM EDT	Special Marine Warning	MFL		56 min
May 20, 8:45 PM EDT	Special Weather Statement	MFL	Glades	30 min
May 20, 9:22 PM EDT	Special Marine Warning	MFL		53 min
May 20, 10:07 PM EDT	Special Weather Statement	MFL	Glades	38 min
May 20, 10:13 PM EDT	Special Marine Warning	MFL		47 min
May 20, 10:23 PM EDT	Special Weather Statement	MFL	Glades	52 min
May 20, 11:48 PM EDT	Special Weather Statement	MFL	Broward	27 min
May 21, 4:44 PM EDT	Special Weather Statement	MFL	Palm Beach	46 min
May 21, 7:18 PM EDT	Special Weather Statement	MFL	Miami-Dade	27 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.