Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 58, NWS Great Falls, MT

July 19, 2001Judith Basin County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 19, 2001, 10:45 PM MDT for Judith Basin County, Montana. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 19, 2001, 10:45 PM MDT (04:45 UTC)
Expired: Jul 19, 2001, 11:30 PM MDT
In force: 45 min
Issued by: NWS Great Falls, MT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Judith Basin County, MT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 4.8 hours before the alert went out and 304 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: 667 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1843 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -52 m²/s²
0-3 km storm-relative helicity: -3 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -2.2

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.

NWS Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 19, 9:00 PM MDT, 1 hour 45 minutes earlier.

Area forecast discussion, Jul 19, 9:00 PM MDT, 1 hour 45 minutes before

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The office that day

Everything else NWS Great Falls, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 20, 5:00 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin	45 min
Jul 20, 5:45 PM MDT	Severe Thunderstorm Warning	TFX	Gallatin	45 min

Nearby

Severe Thunderstorm Warnings in Montana, 2001 Every severe thunderstorm warning in 2001

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.