Alert archive / Florida / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 12, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at Apr 25, 2021, 8:39 AM EDT for Lake County, Seminole County, Volusia County, Florida. It was in force for 36 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
- Apr 25, 2021, 8:39 AM EDT (12:39 UTC)
- Expired
- Apr 25, 2021, 9:15 AM EDT
- In force
- 36 min
- Issued by
- NWS Melbourne, FL
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Lake County, FL, Seminole County, FL, Volusia County, FL
The radar
The Melbourne radar (KMLB), 114 km from the middle of the area, began a volume at 12:41 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, 0.7 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.
- Mixed-layer CAPE
- 1032 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 717 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 177 m²/s²
- 0-3 km storm-relative helicity
- 171 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 5.3
The text
As transmitted.
227
WUUS52 KMLB 251239
SVRMLB
FLC069-117-127-251315-
/O.NEW.KMLB.SV.W.0012.210425T1239Z-210425T1315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
839 AM EDT Sun Apr 25 2021
The National Weather Service in Melbourne has issued a
* Severe Thunderstorm Warning for...
Northwestern Seminole County in east central Florida...
East central Lake County in east central Florida...
Central Volusia County in east central Florida...
* Until 915 AM EDT.
* At 838 AM EDT, a severe thunderstorm was located near Paisley,
moving east at 30 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Deltona, Sanford, Lake Mary, Orange City and Cassia.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 2898 8158 2896 8119 2875 8136 2877 8142
2878 8142 2878 8145 2886 8165
TIME...MOT...LOC 1238Z 282DEG 27KT 2891 8156
TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
$$
Combs2 follow-up statements
541
WWUS52 KMLB 251254
SVSMLB
Severe Weather Statement
National Weather Service Melbourne FL
854 AM EDT Sun Apr 25 2021
FLC069-117-127-251315-
/O.CON.KMLB.SV.W.0012.000000T0000Z-210425T1315Z/
Seminole FL-Lake FL-Volusia FL-
854 AM EDT Sun Apr 25 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 AM EDT
FOR NORTHWESTERN SEMINOLE...EAST CENTRAL LAKE AND CENTRAL VOLUSIA
COUNTIES...
At 854 AM EDT, a severe thunderstorm was located over Cassia, moving
east at 30 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Deltona, Sanford, Lake Mary, Orange City and Cassia.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 2896 8119 2875 8136 2877 8139 2878 8142
2878 8145 2885 8163 2898 8154
TIME...MOT...LOC 1254Z 282DEG 27KT 2888 8142
TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
$$
Combs006
WWUS52 KMLB 251307
SVSMLB
Severe Weather Statement
National Weather Service Melbourne FL
907 AM EDT Sun Apr 25 2021
FLC069-117-127-251316-
/O.EXP.KMLB.SV.W.0012.000000T0000Z-210425T1315Z/
Seminole FL-Lake FL-Volusia FL-
907 AM EDT Sun Apr 25 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN SEMINOLE...EAST
CENTRAL LAKE AND CENTRAL VOLUSIA COUNTIES WILL EXPIRE AT 915 AM
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 gusty
winds, frequent lightning, and heavy rain are still possible with
this thunderstorm.
LAT...LON 2896 8119 2875 8136 2877 8139 2878 8142
2878 8145 2885 8163 2898 8154
TIME...MOT...LOC 1306Z 283DEG 19KT 2887 8139
$$
CombsThe office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 6:52 AM EDT | Special Marine Warning | MLB | 53 min | |
| Apr 25, 6:56 AM EDT | Special Weather Statement | MLB | Flagler | 34 min |
| Apr 25, 7:31 AM EDT | Special Weather Statement | MLB | Lake | 59 min |
| Apr 25, 8:30 AM EDT | Special Weather Statement | MLB | Lake | 30 min |
| Apr 25, 9:28 AM EDT | Special Weather Statement | MLB | Seminole | 32 min |
| Apr 25, 9:44 AM EDT | Severe Thunderstorm Warning | MLB | Brevard, Seminole, Volusia | 46 min |
| Apr 25, 10:04 AM EDT | Special Marine Warning | MLB | 56 min | |
| Apr 25, 12:13 PM EDT | Special Weather Statement | MLB | Brevard | 32 min |
| Apr 25, 12:54 PM EDT | Special Weather Statement | MLB | Brevard | 36 min |
| Apr 25, 12:57 PM EDT | Special Marine Warning | MLB | 63 min | |
| Apr 25, 4:33 PM EDT | Special Marine Warning | MLB | 57 min | |
| Apr 25, 7:22 PM EDT | Special Marine Warning | MLB | 53 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.