Alert archive / Florida / Mesoscale Discussions in 2017

Mesoscale Discussion 1632

September 9, 20179 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Sep 9, 2017, 4:12 PM EDT for 9 counties in Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Sep 9, 2017, 4:12 PM EDT (20:12 UTC)
Expired
Sep 9, 2017, 6:15 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Broward County, FL, Charlotte County, FL, Collier County, FL, Glades County, FL, Hendry County, FL, Lee County, FL, Miami-Dade County, FL, Monroe County, FL, Palm Beach County, FL

The radar

The Key West radar (KBYX), 94 km from the middle of the area, began a volume at 20:14 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, 8.2 hours before the alert went out and 115 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 2017-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1745 joules per kilogram.LCLEL10008507005003002001001 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 2017-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 182 square meters per square second.193958Sfc1 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
1745 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
926 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
182 m²/s²
0-3 km storm-relative helicity
212 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
Sep 9, 8:48 AM EDTMesoscale DiscussionSPCBroward, Martin, Miami-Dade, Palm Beach3 hr
Sep 9, 12:09 PM EDTTornado WatchSPCBroward, Charlotte, Collier, Glades, Hendry, Lee and 3 more12 hr
Sep 9, 7:25 PM EDTMesoscale DiscussionSPCBrevard, Indian River, Martin, Okeechobee, Osceola, Saint Lucie65 min

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.