Alert archive / Florida / Mesoscale Discussions in 2020

Mesoscale Discussion 71

January 31, 2020Miami-Dade County, Monroe County, Florida

The Storm Prediction Center issued this mesoscale discussion at Jan 31, 2020, 10:37 PM EST for Miami-Dade County, Monroe County, Florida. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
Jan 31, 2020, 10:37 PM EST (03:37 UTC)
Expired
Feb 1, 2020, 12:00 AM EST
In force
83 min
Issued by
the Storm Prediction Center

Counties Miami-Dade County, FL, Monroe County, FL

The radar

The Miami radar (KAMX), 86 km from the middle of the area, began a volume at 03:36 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

Key West, FL (KEYW), launched 00:00Z, 3.6 hours before the alert went out and 90 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, Key West, FL at 00:00Z on 2020-02-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1226 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, Key West, FL at 00:00Z on 2020-02-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 116 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
1226 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
915 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
116 m²/s²
0-3 km storm-relative helicity
152 m²/s²
Significant tornado parameter
0.8
Supercell composite
4.8

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
Jan 31, 7:13 PM ESTMesoscale DiscussionSPCMiami-Dade62 min
Jan 31, 8:01 PM ESTSevere Thunderstorm WatchSPCBroward, Collier, Miami-Dade, Monroe6 hr

Nearby

Mesoscale Discussions in Florida, 2020Every mesoscale discussion in 2020

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.