Alert archive / Florida / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 68, NWS Miami, FL
NWS Miami, FL issued this severe thunderstorm warning at Aug 21, 2001, 2:30 PM EDT for Miami-Dade County, Florida. It was in force for 60 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 21, 2001, 2:30 PM EDT (18:30 UTC)
- Expired
- Aug 21, 2001, 3:30 PM EDT
- In force
- 60 min
- Issued by
- NWS Miami, FL
- Area
- Whole counties
County Miami-Dade County, FL
The radar
The Miami radar (KAMX), 9 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 21, 2:34 PM EDT | Hail 0.75 | Miami, FL | Dime-size hail was reported in Kendale Lakes. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Miami, FL (KMFL), launched 12:00Z, 6.5 hours before the alert went out and 31 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
- 1624 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 1006 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Miami, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 21, 10:00 AM EDT, 4 hours 30 minutes earlier.
Area forecast discussion, Aug 21, 10:00 AM EDT, 4 hours 30 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MIAMI FL 1000 AM EDT TUE AUG 21 2001 AS OF THIS MOMENT...NO CHANGES IN THE PREVIOUS FORECAST PACKAGE. HOWEVER..I DO BELIEVE WE COULD SEE ISOLATED HEAVY PRECIP IN SOME AREAS THIS AFTERNOON AS 12Z SOUNDING CAME IN WITH A HIGHER PW (1.90) AND STILL MEAN STEERING FLOW IS VERY LIGHT. THIS WILL ALLOW ANY THUNDERSTORM THAT DEVELOP TO REMAIN NEARLY STATIONARY OR DRIFT VERY SLOWLY. .MIA...NONE. GARCIA
In the hours before
Special weather statement, Aug 21, 9:30 AM EDT, 5 hours before
FLZ063-066>075-202000- SOUTH FLORIDA HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE MIAMI FL 930 AM EDT TUE AUG 21 2001 ...SCATTERED THUNDERSTORMS THIS AFTERNOON... ...SLIGHT CHANCE OF WATERSPOUTS ATLANTIC COASTAL WATERS... SCATTERED THUNDERSTORMS WILL DEVELOP ALONG THE EAST AND WEST COAST SEA BREEZES THIS AFTERNOON. DAYTIME HEATING AND ABUNDANT TROPICAL MOISTURE WILL COMBINE TO PRODUCE SCATTERED THUNDERSTORMS OVER INTERIOR SECTIONS OF SOUTH FLORIDA. ON THE WEST COAST...THE THUNDERSTORM ACTIVITY WILL MOVE SLOWLY TOWARD THE INTERIOR OF SOUTH FLORIDA. ON THE EAST COAST...THE THUNDERSTORMS WILL MOVE TOWARD THE EAST COAST METROPOLITAN AREAS AND ALONG THE SEA BREEZE. THE PRIMARY HAZARDS FROM THESE THUNDERSTORMS WILL BE FREQUENT CLOUD TO GROUND LIGHTNING STRIKES...LOCALLY HEAVY RAINFALL ALONG WITH GUSTY WINDS. HOWEVER...SOME OF THE THUNDERSTORMS COULD APPROACH SEVERE LIMITS WITH GUSTS UP TO 40 MPH. SPOTTER ACTIVATION IS REQUESTED FOR THIS AFTERNOON. A LIGHT EAST TO SOUTHEAST LOW TO MID LEVEL WIND FLOW WILL RESULT IN A SLIGHT CHANCE OF WATERSPOUTS OVER THE ATLANTIC COASTAL WATERS TODAY. FOR ADDITIONAL INFORMATION VISIT THE NATIONAL WEATHER SERVICE IN MIAMI WEBSITE AT HTTP://WWW.SRH.NOAA.GOV/MIA. GARCIA
The office that day
Everything else NWS Miami, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 1:20 PM EDT | Tornado Warning | MFL | Miami-Dade | 25 min |
| Aug 21, 1:44 PM EDT | Severe Thunderstorm Warning | MFL | Miami-Dade | 46 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2001Every severe thunderstorm warning in 2001
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.