Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 98, NWS Melbourne, FL

July 23, 2011Indian River County, Okeechobee County, Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 23, 2011, 2:42 PM EDT for Indian River County, Okeechobee County, Osceola County, Florida. It was in force for 23 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: Jul 23, 2011, 2:42 PM EDT (18:42 UTC)
Expired: Jul 23, 2011, 3:05 PM EDT
In force: 23 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Indian River County, FL, Okeechobee County, FL, Osceola County, FL

The radar

The Melbourne radar (KMLB), 59 km from the middle of the area, began a volume at 18:42 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, 6.7 hours before the alert went out and 100 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: 972 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 997 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 10 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.

608 
WUUS52 KMLB 231842
SVRMLB
FLC061-093-097-231945-
/O.NEW.KMLB.SV.W.0098.110723T1842Z-110723T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
242 PM EDT SAT JUL 23 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN INDIAN RIVER COUNTY IN FLORIDA
  NORTH CENTRAL OKEECHOBEE COUNTY IN FLORIDA
  SOUTHEASTERN OSCEOLA COUNTY IN FLORIDA

* UNTIL 345 PM EDT.

* AT 237 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  YEEHAW JUNCTION...AND MOVING NORTHWEST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED       
  TO...LAKE MARIAN...KENANSVILLE...THE FLORIDA TURNPIKE BETWEEN MILE 
  MARKER 170 AND 210...STATE ROUTE 60 AND US 441. 

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 2770 8116 2771 8115 2772 8117 2779 8120
      2798 8101 2759 8069 2748 8077
TIME...MOT...LOC 1841Z 129DEG 5KT 2774 8094

$$


MOSES

1 follow-up statement

540 
WWUS52 KMLB 231905
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
305 PM EDT SAT JUL 23 2011

FLC061-093-097-231915-
/O.CAN.KMLB.SV.W.0098.000000T0000Z-110723T1945Z/
OSCEOLA-INDIAN RIVER-OKEECHOBEE-
305 PM EDT SAT JUL 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL OKEECHOBEE...
WESTERN INDIAN RIVER AND SOUTHEASTERN OSCEOLA COUNTIES IS
CANCELLED...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO
LONGER CAPABLE OF PRODUCING LARGE HAIL OR DAMAGING WINDS. AS A
RESULT...THE WARNING HAS BEEN CANCELLED. HOWEVER...HEAVY RAIN AND
DANGEROUS LIGHTNING STRIKES WILL CONTINUE TO BE POSSIBLE.

LAT...LON 2770 8116 2771 8115 2772 8117 2779 8120
      2798 8101 2759 8069 2748 8077
TIME...MOT...LOC 1905Z 324DEG 10KT 2775 8096

$$


MOSES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 2:36 PM EDT	Special Weather Statement	MLB	Osceola	54 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.