Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 5, NWS Melbourne, FL

March 30, 2021Lake County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Mar 30, 2021, 7:58 PM EDT for Lake County, Florida. It was in force for 32 min. 2 reports 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: Mar 30, 2021, 7:58 PM EDT (23:58 UTC)
Expired: Mar 30, 2021, 8:30 PM EDT
In force: 32 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Lake County, FL

The radar

The Tampa radar (KTBW), 124 km from the middle of the area, began a volume at 00:00 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
Mar 30, 8:07 PM EDT	HAIL 1	5 Sw Lake Harris, FL	DIME TO QUARTER SIZE HAIL REPORTED BY TRAINED STORM SPOTTER.
Mar 30, 8:10 PM EDT	TSTM WND DMG	5 Sw Lake Harris, FL	NUMEROUS 1-INCH AND LARGER TREE BRANCHES DOWNED THROUGHOUT THE PLANATATION AT LEESBURG COMMUNITY. DELAYED REPORT FROM TRAINED SPOTTER.

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

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 12.0 hours before the alert went out and 124 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: 1096 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 780 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

As transmitted.

244 
WUUS52 KMLB 302358
SVRMLB
FLC069-310030-
/O.NEW.KMLB.SV.W.0005.210330T2358Z-210331T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
758 PM EDT Tue Mar 30 2021

The National Weather Service in Melbourne has issued a

* Severe Thunderstorm Warning for...
  West central Lake County in east central Florida...

* Until 830 PM EDT.

* At 758 PM EDT, a severe thunderstorm was located near Lake Harris,
  moving east at 5 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Howey-In-the-hills, Lake Harris, Hawthorne, Yalaha and Okahumpka. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2868 8195 2879 8195 2881 8179 2866 8178
TIME...MOT...LOC 2358Z 273DEG 5KT 2874 8187 

HAIL...1.00IN
WIND...60MPH
 
$$

Combs

2 follow-up statements

276 
WWUS52 KMLB 310013
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
813 PM EDT Tue Mar 30 2021

FLC069-310030-
/O.CON.KMLB.SV.W.0005.000000T0000Z-210331T0030Z/
Lake FL-
813 PM EDT Tue Mar 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR WEST CENTRAL LAKE COUNTY...

At 812 PM EDT, a severe thunderstorm was located over Lake Harris, 
moving east at 5 mph. Quarter size hail has been reported with this 
storm.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Trained weather spotters.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Howey-In-the-hills, Lake Harris, Hawthorne, Yalaha and Okahumpka. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2881 8179 2866 8178 2868 8192 2879 8192
TIME...MOT...LOC 0012Z 273DEG 5KT 2874 8185 

HAIL...1.50IN
WIND...60MPH
 
$$

Combs

382 
WWUS52 KMLB 310029
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
829 PM EDT Tue Mar 30 2021

FLC069-310037-
/O.EXP.KMLB.SV.W.0005.000000T0000Z-210331T0030Z/
Lake FL-
829 PM EDT Tue Mar 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL LAKE COUNTY WILL
EXPIRE AT 830 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.

LAT...LON 2881 8179 2866 8178 2868 8192 2879 8192
TIME...MOT...LOC 0027Z 273DEG 5KT 2874 8183 

$$

Combs

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 30, 7:54 PM EDT	Special Weather Statement	MLB	Lake	36 min

Nearby

Severe Thunderstorm Warnings in Florida, 2021 Every severe thunderstorm warning in 2021

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.