Alert archive / Florida / Mesoscale Discussions in 2011

Mesoscale Discussion 786

May 14, 201114 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at May 14, 2011, 2:31 PM EDT for 14 counties in Florida. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: May 14, 2011, 2:31 PM EDT (18:31 UTC)
Expired: May 14, 2011, 3:30 PM EDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties DeSoto County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Highlands County, FL, Hillsborough County, FL, Lake County, FL, Manatee County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Polk County, FL, Seminole County, FL, Sumter County, FL

The radar

The Tampa radar (KTBW), 97 km from the middle of the area, began a volume at 18:31 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

Tampa Bay, FL (KTBW), launched 12:00Z, 6.5 hours before the alert went out and 97 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 961 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1160 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

178 
ACUS11 KWNS 141831
SWOMCD
SPC MCD 141831 
FLZ000-141930-

MESOSCALE DISCUSSION 0786
NWS STORM PREDICTION CENTER NORMAN OK
0131 PM CDT SAT MAY 14 2011

AREAS AFFECTED...CNTRL FL

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 

VALID 141831Z - 141930Z

STORMS WILL REMAIN CAPABLE OF PRODUCING LOCALLY STRONG WIND GUSTS
AND MARGINALLY SEVERE HAIL THIS AFTERNOON. 

NUMEROUS STORMS ARE DEVELOPING OVER CNTRL FL INCLUDING ALONG WHAT
APPEARS TO BE A SEA BREEZE THAT HAS MOVED INLAND...WHILE OTHER
STORMS HAVE EVOLVED INTO A LINE FROM NRN FL SWD ALONG THE WRN COAST
NEAR TAMPA. STRONG HEATING /TEMPERATURES AROUND 90/ OF THE MOIST
BOUNDARY HAS BOOSTED MLCAPE TO AROUND 2000 J/KG. POTENTIAL EXISTS
FOR NUMEROUS CELL/OUTFLOW BOUNDARY MERGERS AS THE LINE OF STORMS
MOVES INLAND AND INTERACTS WITH ONGOING ACTIVITY/BOUNDARIES ACROSS
CNTRL FL. WHILE VERTICAL SHEAR IS WEAK...BOUNDARY/CELL INTERACTIONS
ALONG WITH THE MODERATELY UNSTABLE ENVIRONMENT WILL PROMOTE SOME OF
THE STORMS BRIEFLY ATTAINING SEVERE LEVELS. STRONG WIND GUSTS MAY
ALSO ACCOMPANY STRONGER CELLS EMBEDDED WITHIN LINE OF STORMS.

..DIAL.. 05/14/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...MFL...MLB...TBW...JAX...

LAT...LON   26268126 27328245 28888229 29028106 27028044 26268126

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 14, 1:54 AM EDT	Mesoscale Discussion	SPC	Escambia, Santa Rosa	96 min
May 14, 6:05 PM EDT	Mesoscale Discussion	SPC	Baker, Columbia, Dixie, Gilchrist, Hamilton, Jefferson and 6 more	55 min

Nearby

Mesoscale Discussions in Florida, 2011 Every mesoscale discussion 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.