Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 7, NWS Miami, FL

April 22, 2012Glades County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Apr 22, 2012, 2:18 AM EDT for Glades County, Florida. It was in force for 42 min. 1 report 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: Apr 22, 2012, 2:18 AM EDT (06:18 UTC)
Expired: Apr 22, 2012, 3:00 AM EDT
In force: 42 min
Issued by: NWS Miami, FL
Area: Storm-based polygon

County Glades County, FL

The radar

The Melbourne radar (KMLB), 136 km from the middle of the area, began a volume at 06:21 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
Apr 22, 2:50 AM EDT	TSTM WND DMG	Lakeport, FL	THE GLADES COUNTY SHERIFFS OFFICE REPORTED A POSSIBLE TORNADO IN THE LAKEPORT AREA...WITH A RADAR ESTIMATED TIME OF 250 AM EDT.EXTERIOR DAMAGE TO A BUILDING WAS REPORTED...IN ADDITION TO DOWNED POWER LINES AND TREES. THIS IS A PRELIMINARY LOCAL STORM REPORT...

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 21, 11:08 PM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 00:00Z, 6.3 hours before the alert went out and 139 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: 12 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 622 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 228 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

269 
WUUS52 KMFL 220618
SVRMFL
FLC043-220700-
/O.NEW.KMFL.SV.W.0007.120422T0618Z-120422T0700Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
218 AM EDT SUN APR 22 2012

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

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

* UNTIL 300 AM EDT

* AT 212 AM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES
  NORTHEAST OF MUSE...AND MOVING NORTHEAST AT 35 MPH.

* THE STORM WILL AFFECT...
  PALMDALE...
  LAKEPORT...
  BRIGHTON SEMINOLE INDIAN...
  AND SURROUNDING COMMUNITIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 58 MPH AND
OR LARGE DESTRUCTIVE 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.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA UNTIL 700 AM 
EDT SUNDAY MORNING. SEVERE THUNDERSTORMS CAN 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.

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT. THEY WILL RELAY YOUR REPORT TO 
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN MIAMI.

&&

LAT...LON 2703 8099 2698 8108 2695 8107 2692 8110
      2683 8118 2680 8141 2680 8157 2701 8157
      2704 8153 2704 8128 2712 8127 2713 8117
      2721 8117 2722 8116
TIME...MOT...LOC 0617Z 230DEG 31KT 2694 8141

$$

BAXTER

1 follow-up statement

612 
WWUS52 KMFL 220637
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
237 AM EDT SUN APR 22 2012

FLC043-220700-
/O.CON.KMFL.SV.W.0007.000000T0000Z-120422T0700Z/
GLADES FL-
237 AM EDT SUN APR 22 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 AM EDT
FOR CENTRAL GLADES COUNTY...

AT 236 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING LARGE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM 7 MILES NORTHWEST OF LAKEPORT TO
LAKEPORT TO 9 MILES SOUTHEAST OF PALMDALE...MOVING EAST AT 35 MPH.

THE SEVERE THUNDERSTORMS WILL BE NEAR...
LAKEPORT...
BRIGHTON SEMINOLE INDIAN...
  AND SURROUNDING COMMUNITIES.

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.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT. THEY WILL RELAY YOUR REPORT TO 
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN MIAMI.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 AM EDT SUNDAY MORNING FOR
SOUTHERN FLORIDA.

LAT...LON 2703 8099 2698 8108 2695 8107 2692 8110
      2682 8124 2681 8132 2681 8148 2692 8142
      2702 8143 2704 8142 2704 8128 2712 8127
      2713 8117 2721 8117 2722 8116
TIME...MOT...LOC 0637Z 250DEG 29KT 2705 8121 2695 8115
          2683 8123

$$

BAXTER

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 12:16 AM EDT	Special Weather Statement	MFL	Broward	74 min
Apr 22, 1:22 AM EDT	Special Marine Warning	MFL		53 min
Apr 22, 1:47 AM EDT	Special Weather Statement	MFL	Collier, Glades, Hendry	58 min
Apr 22, 1:58 AM EDT	Severe Thunderstorm Warning	MFL	Glades	32 min
Apr 22, 2:12 AM EDT	Special Marine Warning	MFL		63 min
Apr 22, 2:26 AM EDT	Special Marine Warning	MFL		64 min
Apr 22, 2:46 AM EDT	Special Weather Statement	MFL	Collier, Glades, Hendry	59 min
Apr 22, 2:57 AM EDT	Severe Thunderstorm Warning	MFL	Glades	33 min
Apr 22, 3:13 AM EDT	Special Marine Warning	MFL		62 min
Apr 22, 3:22 AM EDT	Special Marine Warning	MFL		38 min
Apr 22, 3:43 AM EDT	Special Weather Statement	MFL	Hendry	62 min
Apr 22, 4:35 AM EDT	Special Weather Statement	MFL	Broward, Miami-Dade, Palm Beach	55 min
Apr 22, 4:49 AM EDT	Wind Advisory	MFL	Broward, Collier, Miami-Dade, Monroe	12 hr
Apr 22, 5:02 AM EDT	Special Marine Warning	MFL		106 min
Apr 22, 5:26 AM EDT	Special Weather Statement	MFL	Miami-Dade	49 min
Apr 22, 12:00 PM EDT	Special Marine Warning	MFL		60 min
Apr 22, 12:41 PM EDT	Severe Thunderstorm Warning	MFL	Broward, Miami-Dade	35 min
Apr 22, 12:52 PM EDT	Special Marine Warning	MFL		83 min
Apr 22, 1:36 PM EDT	Special Marine Warning	MFL		54 min
Apr 22, 1:46 PM EDT	Special Marine Warning	MFL		44 min
Apr 22, 2:12 PM EDT	Special Marine Warning	MFL		63 min
Apr 22, 3:47 PM EDT	Special Marine Warning	MFL		31 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.