Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 22, NWS Melbourne, FL

June 22, 2021Seminole County, Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 22, 2021, 4:09 PM EDT for Seminole County, Volusia County, Florida. It was in force for 17 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: Jun 22, 2021, 4:09 PM EDT (20:09 UTC)
Expired: Jun 22, 2021, 4:26 PM EDT
In force: 17 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Seminole County, FL, Volusia County, FL

The radar

The Melbourne radar (KMLB), 98 km from the middle of the area, began a volume at 20:12 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
Jun 22, 4:18 PM EDT	TSTM WND GST 48	Sanford Airport, FL	MEASURED WIND GUST OUT OF THE NORTHWEST 41 KNOTS/48 MPH.

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, 8.2 hours before the alert went out and 81 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: 1334 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 808 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 109 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

846 
WUUS52 KMLB 222009
SVRMLB
FLC117-127-222045-
/O.NEW.KMLB.SV.W.0022.210622T2009Z-210622T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
409 PM EDT Tue Jun 22 2021

The National Weather Service in Melbourne has issued a

* Severe Thunderstorm Warning for...
  North central Seminole County in east central Florida...
  South central Volusia County in east central Florida...

* Until 445 PM EDT.

* At 408 PM EDT, a severe thunderstorm was located over Sanford,
  moving northeast at 15 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Deltona, Sanford, Orange City, DeBary and Osteen. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Monroe, get away from the water and move indoors 
or inside a vehicle. Remember, lightning can strike out to 15 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now!  Do not 
be caught on the water in a thunderstorm.

&&

LAT...LON 2875 8124 2884 8136 2901 8116 2885 8108
TIME...MOT...LOC 2008Z 242DEG 15KT 2882 8125 

HAIL...0.88IN
WIND...60MPH
 
$$

Sedlock

1 follow-up statement

425 
WWUS52 KMLB 222026
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
426 PM EDT Tue Jun 22 2021

FLC117-127-222036-
/O.CAN.KMLB.SV.W.0022.000000T0000Z-210622T2045Z/
Seminole FL-Volusia FL-
426 PM EDT Tue Jun 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL SEMINOLE AND
SOUTH CENTRAL VOLUSIA COUNTIES IS CANCELLED...
                
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 has been cancelled.  However small hail and 
gusty winds are still possible with this thunderstorm and others 
nearby.

LAT...LON 2875 8124 2884 8136 2901 8116 2885 8108
TIME...MOT...LOC 2025Z 242DEG 15KT 2886 8117 

$$

Sedlock

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 3:23 PM EDT	Special Weather Statement	MLB	Orange	52 min
Jun 22, 3:41 PM EDT	Special Weather Statement	MLB	Lake	49 min
Jun 22, 3:56 PM EDT	Special Weather Statement	MLB	Lake	34 min
Jun 22, 4:01 PM EDT	Special Marine Warning	MLB		3 hr
Jun 22, 4:04 PM EDT	Special Weather Statement	MLB	Orange, Seminole	41 min
Jun 22, 4:33 PM EDT	Special Weather Statement	MLB	Seminole	42 min
Jun 22, 4:45 PM EDT	Special Marine Warning	MLB		3 hr
Jun 22, 5:03 PM EDT	Special Weather Statement	MLB	Osceola	42 min
Jun 22, 5:11 PM EDT	Special Weather Statement	MLB	Lake	49 min
Jun 22, 5:32 PM EDT	Special Marine Warning	MLB		3 hr
Jun 22, 5:42 PM EDT	Special Weather Statement	MLB	Indian River	48 min
Jun 22, 6:10 PM EDT	Special Weather Statement	MLB	Orange	35 min
Jun 22, 6:36 PM EDT	Special Weather Statement	MLB	Brevard	9 min
Jun 22, 6:54 PM EDT	Special Weather Statement	MLB	Okeechobee	51 min
Jun 22, 7:06 PM EDT	Special Weather Statement	MLB	Osceola	39 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.