Alert archive / Oregon / Mesoscale Discussions in 2003

Mesoscale Discussion 1148

May 30, 2003Del Norte County, Siskiyou County, California; 4 counties in Oregon

The Storm Prediction Center issued this mesoscale discussion at May 30, 2003, 3:42 AM PDT for Del Norte County, Siskiyou County, California; 4 counties in Oregon. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: May 30, 2003, 3:42 AM PDT (10:42 UTC)
Expired: May 30, 2003, 4:45 AM PDT
In force: 63 min
Issued by: the Storm Prediction Center

Counties Del Norte County, CA, Siskiyou County, CA, Coos County, OR, Curry County, OR, Jackson County, OR, Josephine County, OR

The nearest sounding before it

Medford/Jackson, OR (KMFR), launched 00:00Z, 10.7 hours before the alert went out and 52 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: 555 J/kg
Mixed-layer CIN: -226 J/kg
Mixed-layer LCL: 2347 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 29, 5:30 PM PDT	Severe Thunderstorm Watch	SPC	Humboldt, Lassen, Modoc, Shasta, Siskiyou, Tehama and 1 more	6 hr
May 29, 9:07 PM PDT	Mesoscale Discussion	SPC	Lassen, Modoc, Shasta, Siskiyou, Tehama, Trinity	53 min

Nearby

Mesoscale Discussions in Oregon, 2003 Mesoscale Discussions in California, 2003 Every mesoscale discussion in 2003

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.