Alert archive / Florida / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 15, NWS Melbourne, FL

May 20, 1986Seminole County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 20, 1986, 3:46 PM EDT for Seminole County, Florida. It was in force for 59 min.

The area

The counties it named.

The facts

Issued: May 20, 1986, 3:46 PM EDT (19:46 UTC)
Expired: May 20, 1986, 4:45 PM EDT
In force: 59 min
Issued by: NWS Melbourne, FL
Area: Whole counties

County Seminole County, FL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 7.8 hours before the alert went out and 77 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: 453 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1030 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, May 20, 12:35 PM EDT, 3 hours 11 minutes before

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Special weather statement, May 20, 1:39 PM EDT, 2 hours 7 minutes before

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Special weather statement, May 20, 2:40 PM EDT, 1 hour 6 minutes before

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Special weather statement, May 20, 2:43 PM EDT, 1 hour 3 minutes before

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Special weather statement, May 20, 2:56 PM EDT, 50 minutes before

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Special weather statement, May 20, 3:40 PM EDT, 6 minutes before

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The office that day

Everything else NWS Melbourne, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 20, 3:38 PM EDT	Tornado Warning	MLB	Orange	52 min

Nearby

Severe Thunderstorm Warnings in Florida, 1986 Every severe thunderstorm warning in 1986

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.