Alert archive / Florida / Mesoscale Discussions in 2017

Mesoscale Discussion 1635

September 10, 201713 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Sep 10, 2017, 2:23 AM EDT for 13 counties in Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 10, 2017, 2:23 AM EDT (06:23 UTC)
Expired: Sep 10, 2017, 4:30 AM EDT
In force: 2 hr
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), 9 km from the middle of the area, began a volume at 06:26 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 00:00Z, 6.4 hours before the alert went out and 29 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1179 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -25 m²/s²
0-3 km storm-relative helicity: 32 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.

Issued	Product	Office	Counties	Lasted
Sep 9, 10:26 PM EDT	Mesoscale Discussion	SPC	Broward, Collier, Glades, Hendry, Highlands, Indian River and 7 more	94 min
Sep 9, 11:45 PM EDT	Tornado Watch	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 13 more	12 hr
Sep 10, 6:05 AM EDT	Mesoscale Discussion	SPC	Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 13 more	115 min
Sep 10, 8:32 AM EDT	Mesoscale Discussion	SPC	Broward, Charlotte, Collier, DeSoto, Glades, Hendry and 9 more	118 min
Sep 10, 12:02 PM EDT	Tornado Watch	SPC	Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 36 more	13 hr
Sep 10, 3:01 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 34 more	119 min

Nearby

Mesoscale Discussions in Florida, 2017 Every 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.