Alert archive / Montana / Special Weather Statements in 2013
Special Weather Statement, NWS Missoula, MT
NWS Missoula, MT issued this special weather statement at Jun 18, 2013, 4:39 PM MDT for Missoula County, Montana. It was in force for 66 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
- Jun 18, 2013, 4:39 PM MDT (22:39 UTC)
- Expired
- Jun 18, 2013, 5:45 PM MDT
- In force
- 66 min
- Issued by
- NWS Missoula, MT
County Missoula County, MT
The radar
The Missoula radar (KMSX), 37 km from the middle of the area, began a volume at 22:41 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, 10.7 hours before the alert went out and 169 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1301 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- -177 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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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 Jun 18, 2:15 PM MDT, 2 hours 24 minutes earlier.
Area forecast discussion, Jun 18, 2:15 PM MDT, 2 hours 24 minutes before
Area Forecast Discussion National Weather Service Missoula MT 215 PM MDT Tue Jun 18 2013 .DISCUSSION...An active weather scenario is setting up for the next 24-48 hours as a low pressure system begins to approach and move through western Montana and north central Idaho. Below are listed the main impacts with this system: ***Strong Thunderstorms***: Thunderstorms are already beginning to form this afternoon under good surface heating and lots of energy and moisture aloft, a favorable pattern for strong to severe thunderstorms exists. The storms are expected to come in two main waves. The first wave is expected to form across southwest Montana this afternoon and move northward into west central and northwest Montana (generally east of a line from Hamilton to Missoula to Kalispell) this afternoon and evening. A second wave of thunderstorms will develop tonight over north central Idaho and move into northwest Montana (generally west of a line from Lost Trail Pass to Lowell to Plains to Eureka) overnight. Thunderstorms will have the potential to produce very heavy rain (which could affect flood prone basins and recent burn areas in Idaho county), hail potentially over 1 inch in diameter and strong winds greater than 50 mph. Those with outdoor activities today and tonight should keep an eye to the sky. ***Heavy rain***: As the upper low pressure system moves into the region tonight and Wednesday, a scenario for very heavy rain is developing. The heaviest rain is expected across the Clearwater mountains into the Idaho panhandle and across northwest Montana. 1" to 2" of rain are possible in these areas tonight through Wednesday night. River and stream levels will likely rise although flooding is not anticipated at this time. There could be localized issues with ponding of water on roadways in urban areas. Elsewhere, most all of the region should see a wetting rain however amounts will be lower as you head into southwest Montana and Lemhi County. Another wave of moisture and energy associated with the upper low pressure system will impact northern Idaho and western Montana Wednesday afternoon. This could mean an additional 0.25 to 0.75 inch of rain, with the higher amounts in the higher terrain of northwest Montana. ***High terrain and mountain pass snow***: As the upper low pressure system approaches late Wednesday, much cooler air will rush into northern Idaho and western Montana. Snow levels should be between 6000 to 7000 feet with some slushy snow/road impacts possible over higher mountain passes such as Lost Trail Pass by Thursday morning. However, by the time the cooler air arrives, the heaviest precipitation should shift north into Canada and well east of the Divide. The upper low pressure system will continue to direct surges of moisture and a very cool air mass over the northern Rockies Friday and Saturday. Higher terrain areas should continue to see some additional snow. In the longer term, the very cool and moist low pressure system should exit to the east late Saturday. However, it appears a moist westerly flow may set up over the northern Rockies late Sunday, Monday and Tuesday with additional showers. && .AVIATION...Scattered thunderstorms have already developed across southwest Montana this afternoon. These storms are expected to track northward through the afternoon and early evening and could impact airfields KBTM between 18/2000z and 18/2300z, KMSO between 18/2200z and 19/0100z and KGPI between 18/2300z and 19/0300z. Some thunderstorms could become quite strong with wind gusts over 45 kts, hail and very heavy rain reducing visibility at times. A second wave of thunderstorms is expected for form late this evening and will affect mostly north central Idaho into northwest Montana although at the time this convection should miss the TAF terminals. Late tonight into tomorrow morning, heavy rain will develop across the region producing low ceilings which will obscure the higher terrain and periodically lower visibility. && .MSO WATCHES/WARNINGS/ADVISORIES... MT...None. ID...None. && Follow us on Facebook and Twitter! https://www.facebook.com/US.NationalWeatherService.Missoula.gov https://www.twitter.com/NWSMissoula
In the hours before
Local storm report, Jun 18, 2:57 PM MDT, 1 hour 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
257 PM MDT TUE JUN 18 2013
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0235 PM HAIL 3 SW OVANDO 46.99N 113.18W
06/18/2013 M0.88 INCH POWELL MT COCORAHS
HAIL DURATION 7 MINUTES
&&
IRIS SYSTEMLocal storm report, Jun 18, 2:58 PM MDT, 1 hour 41 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
258 PM MDT TUE JUN 18 2013
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0224 PM HAIL OVANDO 47.02N 113.13W
06/18/2013 M0.25 INCH POWELL MT TRAINED SPOTTER
LIGHTNING AND HEAVY RAIN. HAIL DURATION 3
MINUTES
&&
IRIS SYSTEMLocal storm report, Jun 18, 3:13 PM MDT, 1 hour 26 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
313 PM MDT TUE JUN 18 2013
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0255 PM NON-TSTM WND GST 4 S SALMON 45.12N 113.88W
06/18/2013 M44 MPH LEMHI ID AWOS
RAIN SHOWER PRODUCED STRONG WIND GUST AT THE
SALMON AIRPORT.
&&
IRIS SYSTEMSpecial weather statement, Jun 18, 3:14 PM MDT, 1 hour 25 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
314 PM MDT TUE JUN 18 2013
IDZ009-010-182145-
EASTERN LEMHI COUNTY-WESTERN LEMHI COUNTY-
314 PM MDT TUE JUN 18 2013
...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN LEMHI COUNTY UNTIL 345
PM MDT...
AT 305 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR INDIAN CREEK IN THE MUSTANG BURN...OR 21
MILES NORTHWEST OF SALMON...MOVING NORTH AT 25 MPH.
WIND GUSTS UP TO 50 MPH AND BRIEF HEAVY RAIN ARE EXPECTED WITH THIS
STORM.
LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...MAINLY RURAL AREAS
OF EXTREME NORTHERN LEMHI COUNTY AND MAY IMPACT HIGHWAY 93 BETWEEN
LOST TRAIL PASS AND GIBBONSVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF THREATENING WEATHER APPROACHES YOUR AREA...GO INDOORS AND STAY
AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL
PROTECTED AREA.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT
TUESDAY EVENING FOR NORTHWESTERN MONTANA.
&&
LAT...LON 4540 11426 4555 11424 4553 11420 4565 11402
4568 11403 4571 11399 4569 11396 4570 11393
4566 11390 4537 11401
TIME...MOT...LOC 2112Z 195DEG 22KT 4549 11409Special weather statement, Jun 18, 3:19 PM MDT, 1 hour 20 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA MT 319 PM MDT TUE JUN 18 2013 MTZ004>006-043-182215- BITTERROOT/SAPPHIRE MOUNTAINS-LOWER CLARK FORK REGION-MISSOULA/BITTERROOT VALLEYS-POTOMAC/SEELEY LAKE REGION- 319 PM MDT TUE JUN 18 2013 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN RAVALLI...NORTHWESTERN GRANITE AND SOUTHERN MISSOULA COUNTIES UNTIL 415 PM MDT... AT 318 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM BONNER TO 7 MILES EAST OF STEVENSVILLE...AND MOVING NORTH AT 15 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...MISSOULA... BONNER...FLORENCE...WEST RIVERSIDE BURN AREA...EAST MISSOULA...LOLO AND TURAH. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF THREATENING WEATHER APPROACHES YOUR AREA...GO INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL PROTECTED AREA. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT TUESDAY EVENING FOR NORTHWESTERN MONTANA. && LAT...LON 4696 11376 4655 11361 4644 11396 4685 11422 TIME...MOT...LOC 2119Z 167DEG 15KT 4683 11379 4653 11394
Special weather statement, Jun 18, 4:39 PM MDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
439 PM MDT TUE JUN 18 2013
MTZ004-005-182345-
LOWER CLARK FORK REGION-MISSOULA/BITTERROOT VALLEYS-
439 PM MDT TUE JUN 18 2013
...SIGNIFICANT WEATHER ADVISORY FOR WESTERN MISSOULA AND EASTERN
MINERAL COUNTIES UNTIL 545 PM MDT...
AT 436 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 11 MILES SOUTHEAST OF ALBERTON...OR 18 MILES WEST
OF MISSOULA...MOVING NORTH AT 20 MPH.
WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH
HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING.
LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...ALBERTON...
NINEMILE...HUSON AND CYR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF THREATENING WEATHER APPROACHES YOUR AREA...GO INDOORS AND STAY
AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL
PROTECTED AREA.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT
TUESDAY EVENING FOR NORTHWESTERN MONTANA.
&&
LAT...LON 4691 11455 4705 11466 4711 11426 4685 11429
4681 11443
TIME...MOT...LOC 2240Z 170DEG 16KT 4688 11437The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 6:22 PM MDT | Special Weather Statement | MSO | Silver Bow | 38 min |
| Jun 18, 2:41 PM MDT | Special Weather Statement | MSO | Powell | 34 min |
| Jun 18, 3:14 PM MDT | Special Weather Statement | MSO | 31 min | |
| Jun 18, 3:19 PM MDT | Special Weather Statement | MSO | Missoula | 56 min |
| Jun 18, 3:48 PM MDT | Severe Thunderstorm Warning | MSO | Missoula | 42 min |
| Jun 18, 4:03 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Missoula | 42 min |
| Jun 18, 5:04 PM MDT | Special Weather Statement | MSO | Missoula | 41 min |
| Jun 18, 5:22 PM MDT | Special Weather Statement | MSO | Flathead | 38 min |
| Jun 18, 5:39 PM MDT | Special Weather Statement | MSO | Lake | 51 min |
| Jun 18, 5:57 PM MDT | Special Weather Statement | MSO | Flathead | 48 min |
Nearby
Special Weather Statements in Montana, 2013Every special weather statement in 2013
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.