Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 70, NWS Melbourne, FL

June 17, 2011Seminole County, Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 17, 2011, 6:02 PM EDT for Seminole County, Volusia County, Florida. It was in force for 58 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: Jun 17, 2011, 6:02 PM EDT (22:02 UTC)
Expired: Jun 17, 2011, 7:00 PM EDT
In force: 58 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Seminole County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 99 km from the middle of the area, began a volume at 22:05 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 10.0 hours before the alert went out and 82 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: 587 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1402 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 5 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.

403 
WUUS52 KMLB 172202
SVRMLB
FLC117-127-172300-
/O.NEW.KMLB.SV.W.0070.110617T2202Z-110617T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
602 PM EDT FRI JUN 17 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL SEMINOLE COUNTY IN FLORIDA
  SOUTH CENTRAL VOLUSIA COUNTY IN FLORIDA

* UNTIL 700 PM EDT.

* AT 601 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR LAKE JESSUP...AND MOVING
  NORTH AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO... 
  SANFORD...LAKE MONROE...OSTEEN...ORANGE CITY...DELTONA...AND 
  DE BARY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 58 MILES AN
HOUR AND OR LARGE DESTRUCTIVE HAIL. FREQUENT TO EXCESSIVE LIGHTNING
AND VERY HEAVY RAIN WILL ALSO BE POSSIBLE. IF THE STORM APPROACHES
YOU...SEEK SHELTER IN AN ENCLOSED BUILDING ON THE LOWEST FLOOR. KEEP
AWAY FROM WINDOWS.

&&

LAT...LON 2897 8103 2862 8110 2862 8130 2890 8135
      2895 8134 2898 8135
TIME...MOT...LOC 2202Z 183DEG 6KT 2875 8120

$$


KELLY

1 follow-up statement

254 
WWUS52 KMLB 172226
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
626 PM EDT FRI JUN 17 2011

FLC117-127-172300-
/O.CON.KMLB.SV.W.0070.000000T0000Z-110617T2300Z/
SEMINOLE-VOLUSIA-
626 PM EDT FRI JUN 17 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT 
FOR SOUTH CENTRAL VOLUSIA AND SEMINOLE COUNTIES...

AT 624 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
DETECT A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR OSTEEN...MOVING NORTH 
AT 20 MPH. OTHER STRONG STORMS WERE DEVELOPING IN WESTERN SEMINOLE 
COUNTY NEAR LAKE MARY AND WILL MOVE TOWARD THE NORTH TO NORTHEAST.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO DE 
BARY...DELTONA...ORANGE CITY...LAKE ASHBY AND CASSADAGA.

LAT...LON 2897 8103 2862 8110 2862 8130 2890 8135
      2895 8134 2898 8135
TIME...MOT...LOC 2225Z 183DEG 17KT 2886 8118

$$


KELLY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 2:55 PM EDT	Special Weather Statement	MLB	Martin, Saint Lucie	50 min
Jun 17, 3:41 PM EDT	Special Weather Statement	MLB	Martin, Saint Lucie	49 min
Jun 17, 3:47 PM EDT	Special Weather Statement	MLB	Okeechobee	58 min
Jun 17, 4:06 PM EDT	Severe Thunderstorm Warning	MLB	Osceola	39 min
Jun 17, 4:14 PM EDT	Severe Thunderstorm Warning	MLB	Martin	31 min
Jun 17, 4:45 PM EDT	Severe Thunderstorm Warning	MLB	Osceola	44 min
Jun 17, 5:15 PM EDT	Special Weather Statement	MLB	Orange	60 min
Jun 17, 5:49 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Osceola	56 min
Jun 17, 6:11 PM EDT	Special Weather Statement	MLB	Lake	49 min
Jun 17, 6:36 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Volusia	54 min
Jun 17, 6:48 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Orange	57 min
Jun 17, 7:02 PM EDT	Special Marine Warning	MLB		118 min
Jun 17, 7:17 PM EDT	Severe Thunderstorm Warning	MLB	Volusia	42 min
Jun 17, 7:32 PM EDT	Special Weather Statement	MLB	Volusia	43 min
Jun 17, 7:41 PM EDT	Areal Flood Advisory	MLB	Lake, Volusia	2 hr
Jun 17, 7:41 PM EDT	Special Weather Statement	MLB	Lake	49 min

Nearby

Severe Thunderstorm Warnings in Florida, 2011 Every severe thunderstorm warning in 2011

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.