Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 8, NWS Miami, FL

April 22, 2012Glades County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Apr 22, 2012, 2:57 AM EDT for Glades County, Florida. It was in force for 33 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, 2:57 AM EDT (06:57 UTC)
Expired
Apr 22, 2012, 3:30 AM EDT
In force
33 min
Issued by
NWS Miami, FL
Area
Storm-based polygon

County Glades County, FL

The radar

The Melbourne radar (KMLB), 119 km from the middle of the area, began a volume at 07:01 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

TimeReportWhereRemark
Apr 22, 3:09 AM EDTTSTM WND GST 489 Nnw Brighton Seminole, FLA MESONET SITE IN NORTHEASTERN GLADES COUNTY REPORTED A SOUTHWEST WIND GUST OF 42 KTS...OR 48 MPH...AT 309 AM EDT. THIS GUST WAS ASSOCIATED WITH AN EXTENSIVE LINE OF STRONG THUNDERSTORMS PUSHING EAST ACROSS SOUTH FLORIDA.

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.

IssuedProductOfficeLasted
Apr 21, 11:08 PM EDTTornado WatchSPC7 hr

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 00:00Z, 7.0 hours before the alert went out and 153 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-pSkew-T log-p diagram, Tampa Bay, FL at 00:00Z on 2012-04-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 12 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 00:00Z on 2012-04-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 228 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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.

937 
WUUS52 KMFL 220657
SVRMFL
FLC043-220730-
/O.NEW.KMFL.SV.W.0008.120422T0657Z-120422T0730Z/

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

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

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

* UNTIL 330 AM EDT

* AT 255 AM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED 
  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 11 MILES NORTH OF BRIGHTON   
  SEMINOLE INDIAN TO 4 MILES EAST OF BRIGHTON SEMINOLE INDIAN TO 7   
  MILES SOUTHEAST OF BRIGHTON SEMINOLE INDIAN...AND MOVING NORTHEAST   
  AT 35 TO 40 MPH.

* THE LINE OF STORMS WILL AFFECT...
  BUCKHEAD RIDGE...
  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.

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 2715 8087 2713 8087 2708 8093 2708 8094
      2704 8092 2703 8096 2705 8098 2700 8103
      2698 8107 2694 8107 2704 8113 2712 8123
      2713 8117 2718 8117 2722 8112 2722 8095
TIME...MOT...LOC 0657Z 246DEG 34KT 2724 8110 2711 8099
          2701 8097

$$

BAXTER
1 follow-up statement
793 
WWUS52 KMFL 220724
SVSMFL

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

FLC043-220734-
/O.EXP.KMFL.SV.W.0008.000000T0000Z-120422T0730Z/
GLADES FL-
324 AM EDT SUN APR 22 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GLADES COUNTY
WILL EXPIRE AT 330 AM EDT...

NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE THUNDERSTORMS HAVE
MOVED OUT OF THE WARNED AREA. THUS THE THUNDERSTORM WARNING WILL
EXPIRE AT 330 AM EDT.

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

LAT...LON 2715 8087 2713 8087 2708 8093 2708 8094
      2704 8092 2703 8096 2705 8098 2700 8103
      2698 8107 2694 8107 2704 8113 2712 8123
      2713 8117 2718 8117 2722 8112 2722 8095
TIME...MOT...LOC 0724Z 246DEG 34KT 2734 8084 2721 8073
          2711 8071

$$

BAXTER

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 22, 12:16 AM EDTSpecial Weather StatementMFLBroward74 min
Apr 22, 1:22 AM EDTSpecial Marine WarningMFL53 min
Apr 22, 1:47 AM EDTSpecial Weather StatementMFLCollier, Glades, Hendry58 min
Apr 22, 1:58 AM EDTSevere Thunderstorm WarningMFLGlades32 min
Apr 22, 2:12 AM EDTSpecial Marine WarningMFL63 min
Apr 22, 2:18 AM EDTSevere Thunderstorm WarningMFLGlades42 min
Apr 22, 2:26 AM EDTSpecial Marine WarningMFL64 min
Apr 22, 2:46 AM EDTSpecial Weather StatementMFLCollier, Glades, Hendry59 min
Apr 22, 3:13 AM EDTSpecial Marine WarningMFL62 min
Apr 22, 3:22 AM EDTSpecial Marine WarningMFL38 min
Apr 22, 3:43 AM EDTSpecial Weather StatementMFLHendry62 min
Apr 22, 4:35 AM EDTSpecial Weather StatementMFLBroward, Miami-Dade, Palm Beach55 min
Apr 22, 4:49 AM EDTWind AdvisoryMFLBroward, Collier, Miami-Dade, Monroe12 hr
Apr 22, 5:02 AM EDTSpecial Marine WarningMFL106 min
Apr 22, 5:26 AM EDTSpecial Weather StatementMFLMiami-Dade49 min
Apr 22, 12:00 PM EDTSpecial Marine WarningMFL60 min
Apr 22, 12:41 PM EDTSevere Thunderstorm WarningMFLBroward, Miami-Dade35 min
Apr 22, 12:52 PM EDTSpecial Marine WarningMFL83 min
Apr 22, 1:36 PM EDTSpecial Marine WarningMFL54 min
Apr 22, 1:46 PM EDTSpecial Marine WarningMFL44 min
Apr 22, 2:12 PM EDTSpecial Marine WarningMFL63 min
Apr 22, 3:47 PM EDTSpecial Marine WarningMFL31 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012Every 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.