Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 97, NWS Melbourne, FL

July 22, 2011Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 22, 2011, 3:27 PM EDT for 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 22, 2011, 3:27 PM EDT (19:27 UTC)
Expired: Jul 22, 2011, 3:50 PM EDT
In force: 23 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Osceola County, FL

The radar

The Melbourne radar (KMLB), 89 km from the middle of the area, began a volume at 19:27 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

Tampa Bay, FL (KTBW), launched 12:00Z, 7.5 hours before the alert went out and 103 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: 1919 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 854 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -38 m²/s²
0-3 km storm-relative helicity: -25 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.

054 
WUUS52 KMLB 221927
SVRMLB
FLC097-222015-
/O.NEW.KMLB.SV.W.0097.110722T1927Z-110722T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
327 PM EDT FRI JUL 22 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN OSCEOLA COUNTY IN FLORIDA

* UNTIL 415 PM EDT.

* AT 322 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
  INTERCESSION CITY...AND MOVING NORTHWEST AT 5 MPH.

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

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 2835 8160 2835 8148 2818 8139 2813 8150
      2814 8152 2814 8153 2820 8153 2826 8156
      2826 8166 2834 8166
TIME...MOT...LOC 1927Z 135DEG 6KT 2822 8154

$$


WEITLICH

1 follow-up statement

829 
WWUS52 KMLB 221950
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
350 PM EDT FRI JUL 22 2011

FLC097-221959-
/O.CAN.KMLB.SV.W.0097.000000T0000Z-110722T2015Z/
OSCEOLA-
350 PM EDT FRI JUL 22 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN OSCEOLA COUNTY 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 2835 8160 2835 8148 2818 8139 2813 8150
      2814 8152 2814 8153 2820 8153 2826 8156
      2826 8166 2834 8166
TIME...MOT...LOC 1949Z 135DEG 6KT 2825 8157

$$


WEITLICH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 2:34 PM EDT	Special Weather Statement	MLB	Lake	41 min
Jul 22, 3:11 PM EDT	Special Weather Statement	MLB	Seminole	49 min
Jul 22, 3:21 PM EDT	Special Weather Statement	MLB	Orange	39 min
Jul 22, 4:03 PM EDT	Special Weather Statement	MLB	Volusia	42 min
Jul 22, 4:26 PM EDT	Special Weather Statement	MLB	Okeechobee	49 min
Jul 22, 4:35 PM EDT	Special Weather Statement	MLB	Lake, Orange, Osceola, Seminole	55 min
Jul 22, 4:49 PM EDT	Areal Flood Advisory	MLB	Lake, Volusia	86 min
Jul 22, 5:07 PM EDT	Areal Flood Advisory	MLB	Orange, Osceola	83 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.