Alert archive / Florida / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 96, NWS Melbourne, FL
NWS Melbourne, FL issued this severe thunderstorm warning at Jul 21, 2011, 7:52 PM EDT for Lake County, Florida. It was in force for 22 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 21, 2011, 7:52 PM EDT (23:52 UTC)
- Expired
- Jul 21, 2011, 8:14 PM EDT
- In force
- 22 min
- Issued by
- NWS Melbourne, FL
- Area
- Storm-based polygon
County Lake County, FL
The radar
The Melbourne radar (KMLB), 135 km from the middle of the area, began a volume at 23:54 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, 11.9 hours before the alert went out and 120 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
- 382 J/kg
- Mixed-layer CIN
- -81 J/kg
- Mixed-layer LCL
- 1083 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 0 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
657
WUUS52 KMLB 212352
SVRMLB
FLC069-220030-
/O.NEW.KMLB.SV.W.0096.110721T2352Z-110722T0030Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
752 PM EDT THU JUL 21 2011
THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHEASTERN LAKE COUNTY IN FLORIDA
* UNTIL 830 PM EDT.
* AT 752 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 58 MPH. THIS STORM WAS LOCATED 10 MILES
WEST OF CASSIA...AND MOVING NORTH AT 5 MPH.
* OTHER LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...
PAISLEY
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 2916 8152 2910 8150 2909 8149 2910 8146
2909 8146 2906 8146 2904 8143 2883 8146
2883 8163 2905 8166 2905 8164 2920 8165
TIME...MOT...LOC 2352Z 162DEG 3KT 2889 8156
$$1 follow-up statement
032
WWUS52 KMLB 220014
SVSMLB
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
814 PM EDT THU JUL 21 2011
FLC069-220024-
/O.CAN.KMLB.SV.W.0096.000000T0000Z-110722T0030Z/
LAKE-
814 PM EDT THU JUL 21 2011
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LAKE COUNTY IS
CANCELLED...
THE SEVERE STORM THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO
LONGER CAPABLE OF PRODUCING LARGE HAIL OR DAMAGING WINDS. AS A
RESULT...THE WARNING HAS BEEN CANCELLED. HOWEVER...HEAVY RAIN AND
DANGEROUS LIGHTNING STRIKES WILL CONTINUE TO BE POSSIBLE ACROSS
NORTHEAST LAKE COUNTY.
LAT...LON 2916 8152 2910 8150 2909 8149 2910 8146
2909 8146 2906 8146 2904 8143 2883 8146
2883 8163 2905 8166 2905 8164 2920 8165
TIME...MOT...LOC 0014Z 162DEG 3KT 2891 8157
$$
15The office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 3:21 PM EDT | Special Weather Statement | MLB | Indian River | 39 min |
| Jul 21, 7:24 PM EDT | Severe Thunderstorm Warning | MLB | Orange, Seminole | 41 min |
| Jul 21, 7:35 PM EDT | Special Weather Statement | MLB | Lake | 40 min |
| Jul 21, 7:36 PM EDT | Areal Flood Advisory | MLB | Lake, Orange, Seminole | 84 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2011Every 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.