Alert archive / Florida / Tornado Warnings in 2015

Tornado Warning 1, NWS Miami, FL

April 20, 2015Miami-Dade County, Florida

NWS Miami, FL issued this tornado warning at Apr 20, 2015, 1:33 PM EDT for Miami-Dade County, Florida. It was in force for 27 min. 2 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
Apr 20, 2015, 1:33 PM EDT (17:33 UTC)
Expired
Apr 20, 2015, 2:00 PM EDT
In force
27 min
Issued by
NWS Miami, FL
Area
Storm-based polygon

County Miami-Dade County, FL

The radar

The Miami radar (KAMX), 40 km from the middle of the area, began a volume at 17:34 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 20, 1:33 PM EDTFUNNEL CLOUDMiami Springs, FLFUNNEL SIGHTED TO THE NORTHEAST OF SWEETWATER. POSITION ESTIMATED BY RADAR.
Apr 20, 1:40 PM EDTHAIL 1Miami Springs, FLTIME ESTIMATED VIA RADAR.

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 20, 1:03 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 5.6 hours before the alert went out and 15 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, Miami, FL at 12:00Z on 2015-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2085 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, Miami, FL at 12:00Z on 2015-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.193958Sfc1 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
2085 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
784 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
82 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.3

Open this sounding in Storm Lab

The text

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

790 
WFUS52 KMFL 201733
TORMFL
FLC086-201800-
/O.NEW.KMFL.TO.W.0001.150420T1733Z-150420T1800Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MIAMI FL
133 PM EDT MON APR 20 2015

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN MIAMI-DADE COUNTY IN SOUTHEASTERN FLORIDA...

* UNTIL 200 PM EDT
    
* AT 133 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED
  OVER OPA-LOCKA...OR OVER HIALEAH...AND MOVING NORTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MIAMI...HIALEAH...MIAMI BEACH...SURFSIDE AND MIAMI GARDENS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO A SHELTER OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE IN A MOBILE
HOME OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND
PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 2590 8012 2585 8012 2585 8018 2583 8018
      2579 8029 2588 8038 2597 8025 2597 8013
      2596 8012 2593 8012 2593 8013 2590 8013
      2591 8014 2589 8013
TIME...MOT...LOC 1733Z 239DEG 15KT 2589 8027 

$$

SI
2 follow-up statements
025 
WWUS52 KMFL 201748
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
148 PM EDT MON APR 20 2015

FLC086-201800-
/O.CON.KMFL.TO.W.0001.000000T0000Z-150420T1800Z/
MIAMI-DADE FL-
148 PM EDT MON APR 20 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 200 PM EDT FOR
NORTHEASTERN MIAMI-DADE COUNTY...
    
AT 148 PM EDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD. A
TORNADO MAY DEVELOP AT ANY TIME. THIS DANGEROUS STORM WAS LOCATED
OVER PINEWOOD...OR NEAR MIAMI GARDENS...MOVING NORTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
MIAMI...HIALEAH...MIAMI BEACH...SURFSIDE AND MIAMI GARDENS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE IN A MOBILE
HOME OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND
PROTECT YOURSELF FROM FLYING DEBRIS.

IF A TORNADO OR OTHER SEVERE WEATHER IS SPOTTED...REPORT IT TO THE
NATIONAL WEATHER SERVICE OR YOUR NEAREST LAW ENFORECEMENT AGENCY WHO
WILL RELAY YOUR REPORT. THIS ACT MAY SAVE THE LIVES OF OTHERS IN THE
PATH OF DANGEROUS WEATHER.

&&

LAT...LON 2581 8027 2586 8029 2591 8029 2597 8019
      2597 8013 2596 8012 2593 8012 2593 8013
      2590 8013 2591 8014 2589 8013 2590 8012
      2585 8012 2585 8018 2583 8018 2581 8023
TIME...MOT...LOC 1748Z 243DEG 15KT 2589 8022 

$$

SI
877 
WWUS52 KMFL 201800
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
200 PM EDT MON APR 20 2015

FLC086-201810-
/O.EXP.KMFL.TO.W.0001.000000T0000Z-150420T1800Z/
MIAMI-DADE FL-
200 PM EDT MON APR 20 2015

...THE TORNADO WARNING FOR NORTHEASTERN MIAMI-DADE COUNTY HAS
EXPIRED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER APPEARS TO BE CAPABLE OF PRODUCING A TORNADO.
THEREFORE THE WARNING HAS BEEN ALLOWED TO EXPIRE.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
MIAMI.

LAT...LON 2581 8027 2586 8029 2591 8029 2597 8019
      2597 8013 2596 8012 2593 8012 2593 8013
      2590 8013 2591 8014 2589 8013 2590 8012
      2585 8012 2585 8018 2583 8018 2581 8023
TIME...MOT...LOC 1759Z 239DEG 15KT 2589 8022 

$$

SI

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 1:08 PM EDTSpecial Weather StatementMFLBroward22 min
Apr 20, 1:30 PM EDTSpecial Weather StatementMFLBroward45 min
Apr 20, 2:01 PM EDTSpecial Marine WarningMFL29 min
Apr 20, 2:05 PM EDTSpecial Weather StatementMFLGlades25 min
Apr 20, 2:15 PM EDTSpecial Weather StatementMFLPalm Beach45 min
Apr 20, 2:54 PM EDTSpecial Weather StatementMFLPalm Beach36 min
Apr 20, 3:11 PM EDTSpecial Weather StatementMFLPalm Beach49 min
Apr 20, 3:15 PM EDTSpecial Marine WarningMFL60 min
Apr 20, 3:59 PM EDTSpecial Weather StatementMFLMartin31 min
Apr 20, 4:13 PM EDTSpecial Weather StatementMFLPalm Beach47 min
Apr 20, 4:16 PM EDTSpecial Marine WarningMFL59 min
Apr 20, 4:53 PM EDTSpecial Weather StatementMFLPalm Beach22 min
Apr 20, 5:10 PM EDTSpecial Marine WarningMFL65 min
Apr 20, 5:19 PM EDTSpecial Weather StatementMFLBroward41 min
Apr 20, 5:49 PM EDTSpecial Marine WarningMFL26 min
Apr 20, 6:22 PM EDTSpecial Marine WarningMFL23 min

Nearby

Tornado Warnings in Florida, 2015Every tornado warning in 2015Tornadoes in 2015

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.