Alert archive / Florida / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 2, NWS Miami, FL

February 28, 2015Palm Beach County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Feb 28, 2015, 2:08 PM EST for Palm Beach County, Florida. It was in force for 22 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: Feb 28, 2015, 2:08 PM EST (19:08 UTC)
Expired: Feb 28, 2015, 2:30 PM EST
In force: 22 min
Issued by: NWS Miami, FL
Area: Storm-based polygon

County Palm Beach County, FL

The radar

The Miami radar (KAMX), 138 km from the middle of the area, began a volume at 19:10 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

Miami, FL (KMFL), launched 12:00Z, 7.1 hours before the alert went out and 113 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: 1007 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 584 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

559 
WUUS52 KMFL 281908
SVRMFL
FLC099-281930-
/O.NEW.KMFL.SV.W.0002.150228T1908Z-150228T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIAMI FL
208 PM EST SAT FEB 28 2015

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN PALM BEACH COUNTY IN SOUTHEASTERN FLORIDA...

* UNTIL 230 PM EST

* AT 207 PM EST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM
  WAS LOCATED OVER NORTH COUNTY AIRPORT...OR WEST OF PALM BEACH
  GARDENS...AND MOVING SOUTHWEST AT 15 MPH. PENNY SIZE HAIL MAY ALSO
  ACCOMPANY THE DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...
  WEST PALM BEACH GARDENS...THE ACREAGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
ALTHOUGH A TORNADO IS NOT IMMEDIATELY LIKELY...IF ONE IS SPOTTED...
ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

&&

LAT...LON 2688 8019 2687 8010 2675 8010 2677 8025
TIME...MOT...LOC 1907Z 025DEG 15KT 2683 8018 

$$

PS

1 follow-up statement

446 
WWUS52 KMFL 281930
SVSMFL

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIAMI FL
230 PM EST SAT FEB 28 2015

FLC099-281939-
/O.EXP.KMFL.SV.W.0002.000000T0000Z-150228T1930Z/
PALM BEACH FL-
230 PM EST SAT FEB 28 2015

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PALM BEACH COUNTY
WILL EXPIRE AT 230 PM EST...
                
HOWEVER, STRONG WINDS ARE STILL POSSIBLE WITH THIS STORM AS WELL AS FLOOD PRODUCING RAINS. THEREFORE,
THE WARNING HAS BEEN REPLACED WITH AN ADVISORY FOR MUCH OF METRO PALM BEACH COUNTY.

LAT...LON 2688 8019 2687 8010 2675 8010 2677 8025
TIME...MOT...LOC 1928Z 025DEG 15KT 2683 8018 

$$

PS

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 4:57 AM EST	Small Craft Advisory	MFL		41 hr
Feb 28, 9:41 AM EST	Special Weather Statement	MFL	Broward	34 min
Feb 28, 10:44 AM EST	Special Weather Statement	MFL	Broward	61 min
Feb 28, 11:34 AM EST	Areal Flood Advisory	MFL	Broward, Miami-Dade	116 min
Feb 28, 12:37 PM EST	Special Weather Statement	MFL	Martin	38 min
Feb 28, 12:51 PM EST	Special Weather Statement	MFL	Martin	39 min
Feb 28, 1:19 PM EST	Areal Flood Advisory	MFL	Broward, Miami-Dade	116 min
Feb 28, 1:31 PM EST	Areal Flood Advisory	MFL	Palm Beach	3 hr
Feb 28, 1:33 PM EST	Special Weather Statement	MFL	Martin	42 min
Feb 28, 2:28 PM EST	Special Weather Statement	MFL	Palm Beach	32 min
Feb 28, 3:05 PM EST	Areal Flood Advisory	MFL	Palm Beach	3 hr
Feb 28, 3:17 PM EST	Areal Flood Advisory	MFL	Broward, Miami-Dade	3 hr
Feb 28, 3:25 PM EST	Special Weather Statement	MFL	Palm Beach	50 min
Feb 28, 3:50 PM EST	Special Weather Statement	MFL	Palm Beach	40 min
Feb 28, 4:36 PM EST	Special Weather Statement	MFL	Broward	24 min
Feb 28, 5:05 PM EST	Special Weather Statement	MFL	Broward	40 min
Feb 28, 5:30 PM EST	Areal Flood Advisory	MFL	Broward, Palm Beach	2 hr
Feb 28, 6:40 PM EST	Areal Flood Advisory	MFL	Broward	65 min

Nearby

Severe Thunderstorm Warnings in Florida, 2015 Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.