Alert archive / Florida / Mesoscale Discussions in 2011

Mesoscale Discussion 1237

June 15, 2011Broward County, Collier County, Monroe County, Florida

The Storm Prediction Center issued this mesoscale discussion at Jun 15, 2011, 7:30 PM EDT for Broward County, Collier County, Monroe County, Florida. It was in force for 30 min.

The area

The outline as issued.

The facts

Issued
Jun 15, 2011, 7:30 PM EDT (23:30 UTC)
Expired
Jun 15, 2011, 8:00 PM EDT
In force
30 min
Issued by
the Storm Prediction Center

Counties Broward County, FL, Collier County, FL, Monroe County, FL

The radar

The Miami radar (KAMX), 75 km from the middle of the area, began a volume at 23:30 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, 11.5 hours before the alert went out and 78 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-pSkew-T log-p diagram, Miami, FL at 12:00Z on 2011-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2477 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Miami, FL at 12:00Z on 2011-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
2477 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
617 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
11 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

316 
ACUS11 KWNS 152330
SWOMCD
SPC MCD 152330 
FLZ000-160000-

MESOSCALE DISCUSSION 1237
NWS STORM PREDICTION CENTER NORMAN OK
0630 PM CDT WED JUN 15 2011

AREAS AFFECTED...SRN FL

CONCERNING...SEVERE THUNDERSTORM WATCH 479...

VALID 152330Z - 160000Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 479
CONTINUES.

SEVERE THREAT SHOULD CONTINUE TO BE INCREASINGLY LOCALIZED/MARGINAL
BEYOND THE SCHEDULED WW EXPIRATION OF 00Z. A REPLACEMENT WW DOES NOT
APPEAR NECESSARY...BUT MAY BE LOCALLY EXTENDED FOR AN HOUR OR SO
WHERE THE MOST INTENSE ACTIVITY PERSISTS.

W/E-ORIENTED SWD-PROPAGATING SHORT-LINE SEGMENT HAS RECENTLY MERGED
WITH WEAKENING TSTMS OVER S FL. WITH LITTLE SPATIAL EXTENT LEFT
UNDISTURBED BY TSTM ACTIVITY...RESTRENGTHENING OF THIS TSTM LINE
OVER THE S PENINSULA APPEARS UNLIKELY. LOCALIZED WET MICROBURSTS
WILL REMAIN THE PRIMARY THREAT THROUGH ABOUT 01Z.

..GRAMS.. 06/15/2011

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

ATTN...WFO...MFL...

LAT...LON   26298166 26568071 26638029 26138033 25468065 25268088
            25308108 25628158 26068172 26298166

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 15, 1:27 PM EDTMesoscale DiscussionSPCBrevard, Charlotte, Citrus, DeSoto, Glades, Hardee and 19 more2 hr
Jun 15, 1:52 PM EDTSevere Thunderstorm WatchSPCBrevard, Broward, Charlotte, Citrus, Collier, DeSoto and 26 more6 hr
Jun 15, 4:29 PM EDTMesoscale DiscussionSPCBrevard, Broward, Charlotte, Citrus, Collier, DeSoto and 24 more91 min

Nearby

Mesoscale Discussions in Florida, 2011Every 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.