Alert archive / Florida / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 21, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at May 12, 2011, 2:27 PM EDT for Miami-Dade County, Florida. It was in force for 33 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
- May 12, 2011, 2:27 PM EDT (18:27 UTC)
- Expired
- May 12, 2011, 3:00 PM EDT
- In force
- 33 min
- Issued by
- NWS Miami, FL
- Area
- Storm-based polygon
County Miami-Dade County, FL
The radar
The Miami radar (KAMX), 20 km from the middle of the area, began a volume at 18:30 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
Miami, FL (KMFL), launched 12:00Z, 6.5 hours before the alert went out and 45 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
- 1881 J/kg
- Mixed-layer CIN
- -68 J/kg
- Mixed-layer LCL
- 978 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 8 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.4
The text
As transmitted, in the capitals the NWS used until 2016.
719 WUUS52 KMFL 121827 SVRMFL FLC086-121900- /O.NEW.KMFL.SV.W.0021.110512T1827Z-110512T1900Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MIAMI FL 227 PM EDT THU MAY 12 2011 THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL MIAMI-DADE COUNTY IN SOUTH FLORIDA. * UNTIL 300 PM EDT * AT 226 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS HAVE DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 6 MILES NORTH OF HOMESTEAD GENERAL AIRPORT...AND MOVING SOUTH AT 25 MPH. * THE STORM WILL AFFECT... THE REDLAND... REDLAND... HOMESTEAD GENERAL AIRPORT... FLORIDA CITY... ROYAL PALM RANGER STATION... AND SURROUNDING COMMUNITIES. PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT LIGHTNING IS OCCURRING WITH THIS THUNDERSTORM. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES AND AVOID WATER. MOVE INDOORS OR INSIDE A VEHICLE IF POSSIBLE. AVOID USING THE TELEPHONE UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES. && LAT...LON 2537 8046 2539 8072 2564 8061 2565 8049 TIME...MOT...LOC 1827Z 013DEG 20KT 2558 8058 $$ TINGLER
2 follow-up statements
742 WWUS52 KMFL 121842 SVSMFL SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 242 PM EDT THU MAY 12 2011 FLC086-121900- /O.CON.KMFL.SV.W.0021.000000T0000Z-110512T1900Z/ MIAMI-DADE FL- 242 PM EDT THU MAY 12 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EDT FOR CENTRAL MIAMI-DADE COUNTY... AT 239 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR AND JUST WEST OF HOMESTEAD GENERAL AIRPORT...MOVING SOUTH AT 30 MPH. IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. LAT...LON 2556 8054 2537 8046 2539 8072 2555 8065 TIME...MOT...LOC 1842Z 018DEG 25KT 2547 8062 $$ TINGLER
195 WWUS52 KMFL 121859 SVSMFL SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MIAMI FL 259 PM EDT THU MAY 12 2011 FLC086-121908- /O.EXP.KMFL.SV.W.0021.000000T0000Z-110512T1900Z/ MIAMI-DADE FL- 259 PM EDT THU MAY 12 2011 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MIAMI-DADE COUNTY WILL EXPIRE AT 300 PM EDT... NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE THUNDERSTORM HAS MOVED OUT OF THE WARNED AREA INTO SOUTH SECTIONS OF MIAMI-DADE COUNTY SOUTH OF HIGHWAY 933. THUS THE THUNDERSTORM WARNING WILL EXPIRE AT 300 PM EDT. LAT...LON 2556 8054 2537 8046 2539 8072 2555 8065 TIME...MOT...LOC 1858Z 018DEG 25KT 2536 8066 $$ TINGLER
The office that day
Everything else NWS Miami, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 3:01 AM EDT | Red Flag Warning | MFL | Broward | 17 hr |
| May 12, 10:18 AM EDT | Small Craft Advisory for Hazardous Seas | MFL | 42 hr | |
| May 12, 1:40 PM EDT | Special Weather Statement | MFL | Miami-Dade | 50 min |
| May 12, 2:15 PM EDT | Special Weather Statement | MFL | Miami-Dade | 45 min |
| May 12, 2:46 PM EDT | Special Weather Statement | MFL | Collier | 44 min |
| May 12, 3:02 PM EDT | Special Weather Statement | MFL | Miami-Dade | 58 min |
| May 12, 3:24 PM EDT | Special Weather Statement | MFL | Collier | 66 min |
| May 12, 3:47 PM EDT | Special Weather Statement | MFL | Monroe | 58 min |
| May 12, 3:49 PM EDT | Severe Thunderstorm Warning | MFL | Miami-Dade, Monroe | 28 min |
| May 12, 6:51 PM EDT | Special Weather Statement | MFL | Collier | 24 min |
| May 12, 7:33 PM EDT | Special Weather Statement | MFL | Collier | 27 min |
| May 12, 7:47 PM EDT | Special Marine Warning | MFL | 28 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.