Alert archive / Florida / Mesoscale Discussions in 2012
Mesoscale Discussion 450
The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2012, 10:03 PM EDT for 8 counties in Florida. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Apr 4, 2012, 10:03 PM EDT (02:03 UTC)
- Expired
- Apr 4, 2012, 11:00 PM EDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
Counties Charlotte County, FL, Collier County, FL, DeSoto County, FL, Hillsborough County, FL, Lee County, FL, Manatee County, FL, Monroe County, FL, Sarasota County, FL
The radar
The Miami radar (KAMX), 156 km from the middle of the area, began a volume at 02:03 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 00:00Z, 2.1 hours before the alert went out and 157 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
- 1125 J/kg
- Mixed-layer CIN
- -102 J/kg
- Mixed-layer LCL
- 1159 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
516
ACUS11 KWNS 050204
SWOMCD
SPC MCD 050203
FLZ000-050300-
MESOSCALE DISCUSSION 0450
NWS STORM PREDICTION CENTER NORMAN OK
0903 PM CDT WED APR 04 2012
AREAS AFFECTED...WRN FL COAST...FL KEYS
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 050203Z - 050300Z
A WIND DAMAGE THREAT WILL DEVELOP ALONG THE WEST COAST OF FL THIS
EVENING WITH THE THREAT SPREADING SWD WITH TIME. THE THREAT SHOULD
REMAIN ISOLATED AND WW ISSUANCE IS NOT EXPECTED.
A LINE OF STRONG TO SEVERE THUNDERSTORMS IS ONGOING JUST TO THE WEST
OF TAMPA BAY EXTENDING SOUTHWEST INTO THE GULF OF MEXICO ABOUT 200
STATUTE MILES. THE LINE IS BEING SUPPORTED BY A SHORTWAVE TROUGH
EVIDENT ON WATER VAPOR IMAGERY AND IS LOCATED ALONG THE ERN EDGE OF
AN AXIS OF MODERATE INSTABILITY. SFC DEWPOINTS ALONG THE WEST COAST
OF FL ARE IN THE LOWER 70S F ALONG WITH STEEP LOW-LEVEL LAPSE RATES
EVIDENT ON THE TAMPA BAY 00Z SOUNDING. THIS ENVIRONMENT SHOULD BE
FAVORABLE FOR STRONG TO POTENTIALLY DAMAGING WINDS. THE LINE SHOULD
WEAKEN AFTER MOVING INLAND DUE TO WEAKER INSTABILITY ACROSS THE
PENINSULA. HOWEVER...MODERATE INSTABILITY ALONG THE SW COAST SHOULD
ENABLE THE LINE TO INTENSIFY SWD WITH TIME EVENTUALLY AFFECTING SRN
FL AND THE FL KEYS LATE THIS EVENING.
..BROYLES.. 04/05/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MFL...KEY...TBW...
LAT...LON 24968073 25588095 26328151 27298182 27978205 28108246
27878278 27138267 26108228 25078172 24738126 24968073SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 5, 2:10 AM EDT | Mesoscale Discussion | SPC | Miami-Dade, Monroe | 3 hr |
| Apr 5, 10:14 AM EDT | Severe Thunderstorm Watch | SPC | Escambia, Okaloosa, Santa Rosa | 8 hr |
| Apr 5, 2:12 PM EDT | Mesoscale Discussion | SPC | Calhoun, Gadsden, Holmes, Jackson, Liberty, Okaloosa and 3 more | 93 min |
| Apr 5, 2:58 PM EDT | Severe Thunderstorm Watch | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 6 more | 6 hr |
| Apr 5, 4:49 PM EDT | Mesoscale Discussion | SPC | Calhoun, Escambia, Gadsden, Holmes, Jackson, Leon and 5 more | 86 min |
Nearby
Mesoscale Discussions in Florida, 2012Every mesoscale discussion in 2012
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.