Alert archive / Montana / Special Weather Statements in 2018

Special Weather Statement, NWS Missoula, MT

March 2, 20186 counties in Montana

NWS Missoula, MT issued this special weather statement at Mar 2, 2018, 3:48 PM MST for 6 counties in Montana. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 2, 2018, 3:48 PM MST (22:48 UTC)
Expired: Mar 2, 2018, 4:45 PM MST
In force: 57 min
Issued by: NWS Missoula, MT

Counties Deer Lodge County, MT, Granite County, MT, Lake County, MT, Missoula County, MT, Powell County, MT, Silver Bow County, MT

The radar

The Missoula radar (KMSX), 105 km from the middle of the area, began a volume at 22:47 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

Spokane, WA (KOTX), launched 12:00Z, 10.8 hours before the alert went out and 301 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: 807 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 240 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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What forecasters said that day

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

NWS Missoula, MT wrote its last area forecast discussion before this special weather statement went out at Mar 2, 2:32 PM MST, 1 hour 16 minutes earlier.

Area forecast discussion, Mar 2, 2:32 PM MST, 1 hour 16 minutes before

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In the hours before

Special weather statement, Mar 2, 1:12 PM MST, 2 hours 36 minutes before

Special Weather Statement
National Weather Service Missoula MT
112 PM MST FRI MAR 2 2018

MTZ001-003>006-043-022100-
Flathead/Mission Valleys MT-Bitterroot/Sapphire Mountains MT-
Missoula/Bitterroot Valleys MT-Lower Clark Fork Region MT-
Kootenai/Cabinet Region MT-Potomac/Seeley Lake Region MT-
112 PM MST FRI MAR 2 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN MISSOULA...
SOUTHWESTERN LAKE...SOUTHEASTERN SANDERS...NORTHWESTERN GRANITE AND
NORTH CENTRAL RAVALLI COUNTIES UNTIL 200 PM MST...

At 112 PM MST, Doppler radar was tracking intense snow showers along
a line extending from Paradise to near Wye to near Woodside. Movement
was northeast at 25 mph.

Winds in excess of 30 mph will be possible with these storms.
Visibility one-half mile or less will be possible.

Locations impacted include...
Missoula, Ravalli, Lolo, Stevensville, St. Ignatius, Florence, Arlee,
Old Agency, Wye, Evaro, Bonner-West Riverside, East Missoula, Dixon,
Frenchtown, Paradise, Moiese, Charlo, Fort Connah, Perma and Quigley.

LAT...LON 4773 11451 4715 11366 4655 11362 4632 11412
      4686 11416 4739 11493
TIME...MOT...LOC 2012Z 228DEG 20KT 4737 11481 4689 11412 4629 11406

Special weather statement, Mar 2, 2:02 PM MST, 1 hour 46 minutes before

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Special weather statement, Mar 2, 2:03 PM MST, 1 hour 45 minutes before

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Special weather statement, Mar 2, 2:47 PM MST, 1 hour 1 minute before

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Special weather statement, Mar 2, 2:48 PM MST, 1 hour before

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Special weather statement, Mar 2, 3:48 PM MST, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 2, 8:08 AM MST	Winter Weather Advisory	MSO	Deer Lodge, Flathead, Granite, Lake, Lincoln, Mineral and 5 more	14 hr
Mar 2, 1:12 PM MST	Special Weather Statement	MSO	Missoula	48 min
Mar 2, 2:02 PM MST	Special Weather Statement	MSO	Missoula	43 min
Mar 2, 2:03 PM MST	Special Weather Statement	MSO	Lake	42 min
Mar 2, 2:47 PM MST	Special Weather Statement	MSO	Lincoln	43 min
Mar 2, 2:48 PM MST	Special Weather Statement	MSO	Powell	42 min
Mar 2, 8:08 AM MST	Winter Storm Warning	MSO	Lemhi	2 hr

Nearby

Special Weather Statements in Montana, 2018 Every special weather statement in 2018

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.