Alert archive / Florida / Mesoscale Discussions in 2011

Mesoscale Discussion 368

April 5, 201113 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2011, 11:02 AM EDT for 13 counties in Florida. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Apr 5, 2011, 11:02 AM EDT (15:02 UTC)
Expired: Apr 5, 2011, 1:00 PM EDT
In force: 118 min
Issued by: the Storm Prediction Center

Counties Broward County, FL, Collier County, FL, Glades County, FL, Hendry County, FL, Highlands County, FL, Indian River County, FL, Lee County, FL, Martin County, FL, Miami-Dade County, FL, Monroe County, FL, Okeechobee County, FL, Palm Beach County, FL, Saint Lucie County, FL

The radar

The Miami radar (KAMX), 92 km from the middle of the area, began a volume at 15:01 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, 3.0 hours before the alert went out and 89 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: 2028 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 645 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 9.0

Open this sounding in Storm Lab

The text

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

570 
ACUS11 KWNS 051502
SWOMCD
SPC MCD 051502 
FLZ000-051700-

MESOSCALE DISCUSSION 0368
NWS STORM PREDICTION CENTER NORMAN OK
1002 AM CDT TUE APR 05 2011

AREAS AFFECTED...SRN FL

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 

VALID 051502Z - 051700Z

A LINE OF THUNDERSTORMS WILL CONTINUE SEWD ACROSS S FL...WITH A FEW
STRONG AND LOCALLY DAMAGING WIND GUSTS POSSIBLE. HOWEVER...AN
ADDITIONAL WW IS NOT EXPECTED TO BE NEEDED.

AN ORGANIZED LINE OF THUNDERSTORMS WELL AHEAD OF THE PRIMARY COLD
FRONT IS CURRENTLY MOVING SEWD ACROSS CNTRL FL. VAD WIND PROFILES
AHEAD OF THE LINE AS WELL AS MODEL GUIDANCE INDICATE A MARGINAL WIND
SHEAR ENVIRONMENT FOR SEVERE...BUT STRONG HEATING WILL CONTINUE TO
INCREASE SBCAPE AND STEEPEN LOW LEVEL LAPSE RATES. A MODIFIED 12Z
MFL SOUNDING INDICATES ON THE ORDER OF 3000 J/KG SBCAPE...WITH
PRECIPITABLE WATER VALUES AROUND 1.50 INCHES. THUS...WHILE MOST OF
THIS ACTIVITY MAY NOT BE SEVERE...POTENTIAL EXISTS FOR ISOLATED
STRONG/DAMAGING DOWNBURSTS.

..JEWELL.. 04/05/2011

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

ATTN...WFO...MFL...MLB...KEY...TBW...

LAT...LON   26628238 28068037 26807982 25518004 25138031 25128117
            25568147 26068192 26628238

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 4, 10:05 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Gadsden, Holmes, Jackson, Leon and 3 more	55 min
Apr 4, 10:28 PM EDT	Tornado Watch	SPC	Bay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 3 more	6 hr
Apr 5, 12:21 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 4 more	84 min
Apr 5, 2:41 AM EDT	Tornado Watch	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 19 more	6 hr
Apr 5, 2:55 AM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bay, Bradford, Calhoun, Clay and 22 more	2 hr
Apr 5, 5:39 AM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 25 more	2 hr
Apr 5, 7:04 AM EDT	Severe Thunderstorm Watch	SPC	Brevard, DeSoto, Hardee, Hernando, Highlands, Hillsborough and 15 more	7 hr
Apr 5, 8:30 AM EDT	Mesoscale Discussion	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 20 more	2 hr

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.