Alert archive / Idaho / Special Weather Statements in 2017
Special Weather Statement, NWS Missoula, MT
NWS Missoula, MT issued this special weather statement at May 6, 2017, 7:47 PM MDT for Lemhi County, Idaho. It was in force for 43 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
- May 6, 2017, 7:47 PM MDT (01:47 UTC)
- Expired
- May 6, 2017, 8:30 PM MDT
- In force
- 43 min
- Issued by
- NWS Missoula, MT
County Lemhi County, ID
The radar
The Missoula radar (KMSX), 202 km from the middle of the area, began a volume at 01:47 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
Great_falls, MT (KTFX), launched 00:00Z, 1.8 hours before the alert went out and 359 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.
- Mixed-layer CAPE
- 442 J/kg
- Mixed-layer CIN
- -81 J/kg
- Mixed-layer LCL
- 2097 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
The text
As transmitted.
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</html>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 May 6, 2:42 PM MDT, 5 hours 5 minutes earlier.
Area forecast discussion, May 6, 2:42 PM MDT, 5 hours 5 minutes before
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</html>In the hours before
Local storm report, May 6, 2:24 PM MDT, 5 hours 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
224 PM MDT SAT MAY 6 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0155 PM TSTM WND GST 13 ENE SULA 45.93N 113.74W
05/06/2017 M66 MPH RAVALLI MT MESONET
RAWS SENSOR REPORTED 66 MPH GUST AS STORM
MOVED THROUGH. SENSOR REPORTS HOURLY, WITH
THE HOUR CONTAINING THIS REPORT BEING 1:09PM
- 2:09PM MDT. ESTIMATED TIME OF GUST IS
1:55PM MDT BASED ON STORM LOCATION.
&&
LVSpecial weather statement, May 6, 2:31 PM MDT, 5 hours 16 minutes before
Special Weather Statement
National Weather Service Missoula MT
231 PM MDT SAT MAY 6 2017
MTZ007-062115-
Butte/Blackfoot Region MT-
231 PM MDT SAT MAY 6 2017
...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL DEER LODGE...SILVER BOW
AND SOUTHERN POWELL COUNTIES UNTIL 315 PM MDT...
At 230 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 13 miles northeast of WISDOM to 7 miles
northeast of TWIN BRIDGES. Movement was northeast at 35 mph.
Half inch hail and winds in excess of 40 mph will be possible with
these storms.
Locations impacted include...
Butte, Anaconda, Silver Bow, Walkerville, Warm Springs, Galen,
Gregson Hot Springs, Divide, Nissler, Crackerville, Fishtrap, DEWEY,
Opportunity, Ramsay, Janney, Newcomb and Melrose.
LAT...LON 4576 11250 4568 11255 4563 11269 4575 11276
4581 11300 4588 11310 4588 11321 4582 11328
4581 11334 4576 11337 4580 11343 4628 11277
4623 11259 4618 11257 4618 11251 4613 11252
4610 11247 4589 11240 4585 11243 4575 11219
TIME...MOT...LOC 2030Z 219DEG 31KT 4580 11333 4556 11213Local storm report, May 6, 2:57 PM MDT, 4 hours 50 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
257 PM MDT SAT MAY 6 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0242 PM HAIL 1 W GEORGETOWN 46.20N 113.26W
05/06/2017 E1.25 INCH DEER LODGE MT TRAINED SPOTTER
TRAINED SPOTTERS ESTIMATED QUARTER AND HALF
DOLLAR SIZED HAIL STONES. THEY WERE WORRIED
ABOUT VEHICLE DAMAGE. DID NOT GO OUTSIDE YET
TO CHECK VEHICLES.
&&
LVLocal storm report, May 6, 4:11 PM MDT, 3 hours 36 minutes before
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</html>Special weather statement, May 6, 6:35 PM MDT, 1 hour 12 minutes before
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</html>Special weather statement, May 6, 7:47 PM MDT, 0 minutes before
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</html>The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 8:45 PM MDT | Special Weather Statement | MSO | Deer Lodge, Silver Bow | 75 min |
| May 6, 6:35 PM MDT | Special Weather Statement | MSO | Lemhi | 55 min |
| May 7, 4:02 AM MDT | River Flood Warning | MSO | Lemhi | 72 hr |
Nearby
Special Weather Statements in Idaho, 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.