Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 46, NWS Melbourne, FL

May 27, 2011Lake County, Orange County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 27, 2011, 7:06 PM EDT for Lake County, Orange County, Florida. It was in force for 39 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: May 27, 2011, 7:06 PM EDT (23:06 UTC)
Expired: May 27, 2011, 7:45 PM EDT
In force: 39 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

Counties Lake County, FL, Orange County, FL

The radar

The Melbourne radar (KMLB), 111 km from the middle of the area, began a volume at 23:09 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, 11.1 hours before the alert went out and 107 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: 309 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1248 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 30 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.

206 
WUUS52 KMLB 272306
SVRMLB
FLC069-095-272345-
/O.NEW.KMLB.SV.W.0046.110527T2306Z-110527T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
706 PM EDT FRI MAY 27 2011

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL LAKE COUNTY IN FLORIDA
  NORTHWESTERN ORANGE COUNTY IN FLORIDA

* UNTIL 745 PM EDT.

* AT 704 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
  HOWEY IN THE HILLS...AND MOVING EAST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
  TAVARES...FERNDALE...LAKE APOPKA...MOUNT DORA...ZELLWOOD...WEKIWA
  SPRINGS STATE PARK...MOUNT PLYMOUTH AND APOPKA

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 2888 8147 2871 8144 2870 8145 2864 8145
      2864 8142 2860 8184 2878 8187
TIME...MOT...LOC 2306Z 260DEG 12KT 2871 8175

$$
BOWEN

1 follow-up statement

865 
WWUS52 KMLB 272344
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
744 PM EDT FRI MAY 27 2011

FLC069-095-272352-
/O.EXP.KMLB.SV.W.0046.000000T0000Z-110527T2345Z/
ORANGE-LAKE-
744 PM EDT FRI MAY 27 2011

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL LAKE AND NORTHWESTERN
ORANGE COUNTIES WILL EXPIRE AT 745 PM EDT...

THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED...THUS THE 
WARNING HAS BEEN ALLOWED TO EXPIRE. HEAVY RAIN AND GUSTY WINDS UP TO 
ABOUT 40 MPH WILL STILL BE LIKELY.

LAT...LON 2888 8147 2871 8144 2870 8145 2864 8145
      2864 8142 2860 8184 2878 8187
TIME...MOT...LOC 2342Z 260DEG 12KT 2873 8161

$$
BOWEN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 9:49 PM EDT	Areal Flood Advisory	MLB	Lake	56 min
May 27, 1:36 PM EDT	Special Weather Statement	MLB	Indian River	39 min
May 27, 3:04 PM EDT	Special Weather Statement	MLB	Okeechobee	41 min
May 27, 4:04 PM EDT	Special Weather Statement	MLB	Seminole	41 min
May 27, 5:29 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Osceola	40 min
May 27, 6:06 PM EDT	Severe Thunderstorm Warning	MLB	Lake	39 min
May 27, 6:43 PM EDT	Severe Thunderstorm Warning	MLB	Lake	47 min
May 27, 7:30 PM EDT	Areal Flood Advisory	MLB	Lake, Orange	2 hr

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.