Alert archive / Montana / Special Weather Statements in 2017

Special Weather Statement, NWS Great Falls, MT

July 10, 2017Glacier County, Montana

NWS Great Falls, MT issued this special weather statement at Jul 10, 2017, 9:34 PM MDT for Glacier County, Montana. It was in force for 41 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
Jul 10, 2017, 9:34 PM MDT (03:34 UTC)
Expired
Jul 10, 2017, 10:15 PM MDT
In force
41 min
Issued by
NWS Great Falls, MT

County Glacier County, MT

The radar

The Great Falls radar (KTFX), 175 km from the middle of the area, began a volume at 03:35 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

Great_falls, MT (KTFX), launched 00:00Z, 3.6 hours before the alert went out and 205 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, Great_falls, MT at 00:00Z on 2017-07-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 71 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, Great_falls, MT at 00:00Z on 2017-07-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -48 square meters per square second.19395878Sfc1 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
71 J/kg
Mixed-layer CIN
-86 J/kg
Mixed-layer LCL
2953 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
-48 m²/s²
0-3 km storm-relative helicity
15 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

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 Great Falls, MT wrote its last area forecast discussion before this special weather statement went out at Jul 10, 8:53 PM MDT, 41 minutes earlier.

Area forecast discussion, Jul 10, 8:53 PM MDT, 41 minutes before
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In the hours before

Special weather statement, Jul 10, 8:01 PM MDT, 1 hour 33 minutes before
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Special weather statement, Jul 10, 8:23 PM MDT, 1 hour 11 minutes before
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Local storm report, Jul 10, 8:27 PM MDT, 1 hour 7 minutes before
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Local storm report, Jul 10, 8:46 PM MDT, 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
846 PM MDT MON JUL 10 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0329 PM     HAIL             12 NNW SILVER STAR      45.84N 112.41W
07/10/2017  M1.25 INCH       JEFFERSON          MT   PUBLIC

            RESIDENT ON Z BAR T ROAD RFEPORTED HAIL SMALLER THAN
            GOLF BALLS BUT LARGER THAN QUARTERS. DAMAGES INCLUDED
            TREE BRANCHES DOWN AND DENTS OVER THE SURFACE OF CAMPER.
            WIND WAS NOT OVERLY STRONG.

&&

MLS
Special weather statement, Jul 10, 9:09 PM MDT, 25 minutes before
Special Weather Statement
National Weather Service Great Falls MT
909 PM MDT MON JUL 10 2017

MTZ044-045-110400-
Liberty MT-Toole MT-
909 PM MDT MON JUL 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN LIBERTY AND NORTHEASTERN
TOOLE COUNTIES UNTIL 1000 PM MDT...

At 909 PM MDT, Doppler radar was tracking a strong thunderstorm 19
miles east of Sunburst, or 33 miles northeast of Shelby, moving east
at 30 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Whitlash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4877 11089 4881 11181 4900 11181 4900 11088
TIME...MOT...LOC 0309Z 267DEG 25KT 4893 11149

MLS
Special weather statement, Jul 10, 9:34 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Great Falls MT
934 PM MDT MON JUL 10 2017

MTZ009-010-044-110415-
Northern Rocky Mountain Front MT-Eastern Glacier MT-Toole MT-
934 PM MDT MON JUL 10 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN GLACIER AND
NORTHWESTERN TOOLE COUNTIES UNTIL 1015 PM MDT...

At 934 PM MDT, Doppler radar was tracking a strong thunderstorm 22
miles northwest of Cut Bank, moving east at 25 mph.

Dime size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Sunburst, Sweet Grass and Santa Rita.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4900 11179 4876 11179 4871 11314 4900 11323
TIME...MOT...LOC 0334Z 265DEG 21KT 4893 11252

MLS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 10, 6:13 PM MDTSpecial Weather StatementTFXGallatin32 min
Jul 10, 6:44 PM MDTSevere Thunderstorm WarningTFXLewis and Clark31 min
Jul 10, 7:05 PM MDTSpecial Weather StatementTFXLewis and Clark40 min
Jul 10, 7:11 PM MDTSpecial Weather StatementTFXGallatin34 min
Jul 10, 7:24 PM MDTSpecial Weather StatementTFXSilver Bow36 min
Jul 10, 7:52 PM MDTSpecial Weather StatementTFXLewis and Clark38 min
Jul 10, 8:01 PM MDTSpecial Weather StatementTFXJefferson44 min
Jul 10, 8:23 PM MDTSpecial Weather StatementTFXChouteau52 min
Jul 10, 9:09 PM MDTSpecial Weather StatementTFXToole51 min
Jul 10, 10:52 PM MDTSpecial Weather StatementTFXToole38 min
Jul 10, 11:23 PM MDTSpecial Weather StatementTFXToole67 min
Jul 10, 11:55 PM MDTSpecial Weather StatementTFXHill50 min
Jul 11, 12:13 AM MDTSevere Thunderstorm WarningTFXBlaine, Hill47 min
Jul 11, 1:00 AM MDTSevere Thunderstorm WarningTFXBlaine45 min
Jul 11, 2:21 PM MDTSpecial Weather StatementTFXBlaine39 min
Jul 11, 2:50 PM MDTSpecial Weather StatementTFXBlaine40 min
Jul 11, 5:13 PM MDTSpecial Weather StatementTFX32 min
Jul 11, 5:15 PM MDTSpecial Weather StatementTFXBlaine30 min

Nearby

Special Weather Statements in Montana, 2017Every special weather statement in 2017

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.