Alert archive / Florida / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 57, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at Aug 12, 2021, 4:43 PM EDT for Broward County, Miami-Dade County, Florida. It was in force for 32 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
- Aug 12, 2021, 4:43 PM EDT (20:43 UTC)
- Expired
- Aug 12, 2021, 5:15 PM EDT
- In force
- 32 min
- Issued by
- NWS Miami, FL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Broward County, FL, Miami-Dade County, FL
The radar
The Miami radar (KAMX), 42 km from the middle of the area, began a volume at 20:43 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 |
|---|---|---|---|
| Aug 12, 4:59 PM EDT | MARINE TSTM WIND 40 | 1 S North Miami Beach, FL | WEATHER FLOW STATION XNMI REPORTED A WIND GUSTS OF 40 MPH FROM A THUNDERSTORM. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Miami, FL (KMFL), launched 12:00Z, 8.7 hours before the alert went out and 17 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
- 1357 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 1074 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- -4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
241
WUUS52 KMFL 122043
SVRMFL
FLC011-086-122115-
/O.NEW.KMFL.SV.W.0057.210812T2043Z-210812T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
443 PM EDT Thu Aug 12 2021
The National Weather Service in Miami has issued a
* Severe Thunderstorm Warning for...
Northern Miami-Dade County in southeastern Florida...
Southern Broward County in southeastern Florida...
* Until 515 PM EDT.
* At 442 PM EDT, severe thunderstorms were located along a line
extending from 12 miles east of Port Everglades to near Surfside,
moving southwest at 25 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Miami, Hialeah, Pembroke Pines, Hollywood and Miramar.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 2579 8005 2574 8039 2595 8031 2609 8011
2610 8004
TIME...MOT...LOC 2042Z 066DEG 23KT 2604 7994 2587 8008
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
BAXTER1 follow-up statement
790
WWUS52 KMFL 122105
SVSMFL
Severe Weather Statement
National Weather Service Miami FL
505 PM EDT Thu Aug 12 2021
FLC011-086-122115-
/O.EXP.KMFL.SV.W.0057.000000T0000Z-210812T2115Z/
Miami-Dade FL-Broward FL-
505 PM EDT Thu Aug 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN MIAMI-DADE AND
SOUTHERN BROWARD COUNTIES WILL EXPIRE AT 515 PM EDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However gusty
winds and heavy rain are still possible with these thunderstorms.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Miami. You can also share your report with NWS Miami on
Facebook and Twitter.
LAT...LON 2579 8005 2574 8039 2595 8031 2609 8011
2610 8004
TIME...MOT...LOC 2105Z 066DEG 23KT 2598 8008 2581 8022
$$
BAXTERThe office that day
Everything else NWS Miami, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 2:48 PM EDT | Special Marine Warning | MFL | 42 min | |
| Aug 12, 3:23 PM EDT | Special Marine Warning | MFL | 35 min | |
| Aug 12, 4:19 PM EDT | Special Marine Warning | MFL | 41 min | |
| Aug 12, 4:27 PM EDT | Special Weather Statement | MFL | Miami-Dade | 63 min |
| Aug 12, 4:42 PM EDT | Special Marine Warning | MFL | 63 min | |
| Aug 12, 4:56 PM EDT | Tropical Storm Watch | MFL | Collier, Miami-Dade, Monroe | 30 hr |
| Aug 12, 7:02 PM EDT | Special Marine Warning | MFL | 43 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.