Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 35, NWS Melbourne, FL

May 13, 2011Seminole County, Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 13, 2011, 7:53 PM EDT for Seminole County, Volusia County, Florida. It was in force for 37 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: May 13, 2011, 7:53 PM EDT (23:53 UTC)
Expired: May 13, 2011, 8:30 PM EDT
In force: 37 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Seminole County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 81 km from the middle of the area, began a volume at 23:54 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
May 13, 7:58 PM EDT	HAIL 0.88	2 Nw Chuluota, FL	NICKEL SIZE HAIL OCCURRED FOR 15 MINUTES.

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

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 11.9 hours before the alert went out and 62 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: 53 J/kg
Mixed-layer CIN: -288 J/kg
Mixed-layer LCL: 1251 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 129 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.

957 
WUUS52 KMLB 132353
SVRMLB
FLC117-127-140030-
/O.NEW.KMLB.SV.W.0035.110513T2353Z-110514T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
753 PM EDT FRI MAY 13 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

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

* UNTIL 830 PM EDT.

* AT 750 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 GENEVA...AND MOVING EAST AT
  20 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  LAKE HARNEY.

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 2879 8095 2878 8097 2876 8097 2867 8102
      2861 8120 2874 8124 2885 8109
TIME...MOT...LOC 2353Z 262DEG 15KT 2874 8107

$$



BRAGAW

2 follow-up statements

126 
WWUS52 KMLB 140000
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
800 PM EDT FRI MAY 13 2011

FLC117-127-140030-
/O.CON.KMLB.SV.W.0035.000000T0000Z-110514T0030Z/
SEMINOLE-VOLUSIA-
800 PM EDT FRI MAY 13 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR SOUTH CENTRAL VOLUSIA AND EASTERN SEMINOLE COUNTIES...

AT 754 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 LAKE HARNEY...OR NEAR
GENEVA...MOVING EAST AT 15 MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTY.

LAT...LON 2879 8095 2878 8097 2876 8097 2867 8102
      2861 8120 2874 8124 2885 8109
TIME...MOT...LOC 0000Z 262DEG 15KT 2874 8104

$$



BRAGAW

845 
WWUS52 KMLB 140026
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
826 PM EDT FRI MAY 13 2011

FLC117-127-140037-
/O.EXP.KMLB.SV.W.0035.000000T0000Z-110514T0030Z/
SEMINOLE-VOLUSIA-
826 PM EDT FRI MAY 13 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL VOLUSIA AND
EASTERN SEMINOLE COUNTIES WILL EXPIRE AT 830 PM EDT...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND EXITED 
THE WARNING AREA...THUS THE WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 2879 8095 2878 8097 2876 8097 2867 8102
      2861 8120 2874 8124 2885 8109
TIME...MOT...LOC 0027Z 262DEG 15KT 2876 8091

$$



BRAGAW

The office that day

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

Issued	Product	Office	Counties	Lasted
May 13, 6:04 PM EDT	Severe Thunderstorm Warning	MLB	Lake, Orange	28 min
May 13, 6:35 PM EDT	Special Weather Statement	MLB	Volusia	40 min
May 13, 6:53 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Osceola	52 min
May 13, 7:32 PM EDT	Severe Thunderstorm Warning	MLB	Brevard, Seminole, Volusia	43 min
May 13, 7:45 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Seminole	45 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.