Alert archive / Florida / Mesoscale Discussions in 2017

Mesoscale Discussion 186

February 15, 201713 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Feb 15, 2017, 4:35 PM EST for 13 counties in Florida. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
Feb 15, 2017, 4:35 PM EST (21:35 UTC)
Expired
Feb 15, 2017, 6:30 PM EST
In force
115 min
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Brevard County, FL, DeSoto County, FL, Glades County, FL, Hardee County, FL, Highlands County, FL, Indian River County, FL, Martin County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Polk County, FL, Saint Lucie County, FL, Seminole County, FL

The radar

The Melbourne radar (KMLB), 94 km from the middle of the area, began a volume at 21:39 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 9.6 hours before the alert went out and 132 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, Cape Canaveral, FL at 12:00Z on 2017-02-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Cape Canaveral, FL at 12:00Z on 2017-02-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 112 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
932 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
112 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 15, 11:23 AM ESTMesoscale DiscussionSPCBaker, Bradford, Columbia, Duval, Hamilton, Jefferson and 6 more3 hr
Feb 15, 1:50 PM ESTMesoscale DiscussionSPCAlachua, Citrus, Flagler, Hernando, Hillsborough, Lake and 8 more2 hr

Nearby

Mesoscale Discussions in Florida, 2017Every mesoscale discussion in 2017

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.