Alert archive / Montana / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 12, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 10, 2015, 6:23 PM MDT for Missoula County, Montana. It was in force for 52 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 10, 2015, 6:23 PM MDT (00:23 UTC)
- Expired
- Aug 10, 2015, 7:15 PM MDT
- In force
- 52 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
County Missoula County, MT
The radar
The Missoula radar (KMSX), 16 km from the middle of the area, began a volume at 00:25 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 10, 6:39 PM MDT | TSTM WND GST 73 | 6 Nw Missoula, MT | |
| Aug 10, 6:49 PM MDT | TSTM WND DMG | 2 W Missoula, MT | 5 MEDIUM TREES DOWN. ABOUT 8 TO 12 INCHES IN DIAMETER. THIS IS A CORRECTION - THE EARLIER LSR WAS 1 HOUR OFF. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched 3 storm reports to this severe thunderstorm warning; the first came 16 minutes after it went out.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Spokane, WA (KOTX), launched 00:00Z, 0.4 hours before the alert went out and 204 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
- 650 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 2888 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
633 WUUS55 KMSO 110023 SVRMSO MTC063-110115- /O.NEW.KMSO.SV.W.0012.150811T0023Z-150811T0115Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MISSOULA MT 623 PM MDT MON AUG 10 2015 THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTH CENTRAL MISSOULA COUNTY IN WEST CENTRAL MONTANA... * UNTIL 715 PM MDT * AT 622 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR LOLO...OR NEAR MISSOULA...AND MOVING NORTH AT 25 MPH. THIS STORM HAS A HISTORY OF DAMAGING WINDS...CAPABLE OF DOWNING POWER LINES AND TREES. * LOCATIONS IMPACTED INCLUDE... MISSOULA...LOLO...FRENCHTOWN...EVARO...WYE...EAST MISSOULA... BONNER-WEST RIVERSIDE AND TURAH. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL... DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 4677 11383 4678 11415 4708 11427 4707 11378 TIME...MOT...LOC 0022Z 179DEG 21KT 4680 11402 $$
2 follow-up statements
946 WWUS55 KMSO 110056 SVSMSO SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA MT 656 PM MDT MON AUG 10 2015 MTC063-110115- /O.CON.KMSO.SV.W.0012.000000T0000Z-150811T0115Z/ MISSOULA MT- 656 PM MDT MON AUG 10 2015 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM MDT FOR SOUTH CENTRAL MISSOULA COUNTY... AT 655 PM MDT...EMERGENCY MANAGEMENT REPORTED A SEVERE THUNDERSTORM PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR EVARO...OR 8 MILES NORTH OF MISSOULA...MOVING NORTH AT 25 MPH. LOCATIONS IMPACTED INCLUDE... MISSOULA...LOLO...FRENCHTOWN...EVARO...WYE...EAST MISSOULA... BONNER-WEST RIVERSIDE AND TURAH. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS STORM HAS A HISTORY OF PRODUCING WIND DAMAGE. THIS IS A VERY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. && LAT...LON 4677 11383 4678 11415 4708 11427 4707 11378 TIME...MOT...LOC 0055Z 179DEG 21KT 4700 11403 $$
967
WWUS55 KMSO 110106
SVSMSO
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
ISSUED BY NATIONAL WEATHER SERVICE GREAT FALLS MT
706 PM MDT MON AUG 10 2015
MTC063-110116-
/O.EXP.KMSO.SV.W.0012.000000T0000Z-150811T0115Z/
MISSOULA MT-
706 PM MDT MON AUG 10 2015
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MISSOULA COUNTY
WILL EXPIRE AT 715 PM MDT...
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.
THIS THUNDERSTORM PRODUCE A WIND GUST TO 74 MPH AT THE MISSOULA
AIRPORT AT 633 PM.
LAT...LON 4677 11383 4678 11415 4708 11427 4707 11378
TIME...MOT...LOC 0058Z 179DEG 21KT 4700 11403
$$
BRUSDAWhat 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 Missoula, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 10, 2:28 PM MDT, 3 hours 55 minutes earlier.
Area forecast discussion, Aug 10, 2:28 PM MDT, 3 hours 55 minutes before
Area Forecast Discussion
National Weather Service Missoula MT
228 PM MDT MON AUG 10 2015
.DISCUSSION...Showers and thunderstorms have already begun to
develop this afternoon across the Bitterroot Mountains of western
Montana, and the Clearwater Mountains in central Idaho. These
storms are currently moving fairly fast, and with little
lightning. Further development is expected this afternoon
throughout western Montana and central Idaho. The thunderstorms
will also gain strength and will be producing frequent lightning
and be able to produce gusty and erratic winds up to 50 mph. Even
if you are not directly under one of the cells, you can still
expect gusty outflow winds approaching 40 to 50 mph, especially in
the Bitterroot and Missoula Valleys. Thunderstorms will gradually
decrease this evening and overnight.
Due to the dry conditions and the expected lightning and gusty
winds, a red flag warning has been issued due to the potential for
increased fire danger.
The rest of the week looks quite HOT. Temperatures will be rising
tomorrow and Wednesday into the upper 90s in western Montana and
into the low 100s in the lower valleys of central Idaho. A couple
instances where the highs could be held down is in cloud cover
and isolated afternoon thunderstorms. If your location is impacted
by any of the above, you potentially couldn't reach those highs.
Thunderstorms will be hit and miss.
Thunderstorms will once again develop by late morning on
Thursday, encompassing central Idaho first and then spreading into
western Montana through the evening hours. Storms could produce
gusty winds, as well as abundant lightning. Given the outdoor
activities taking place this week into this weekend, those
intending to be outdoors should have a plan in the case that gusty
winds or lightning end up impacting outdoor events. With increased
moisture content available in the atmosphere, occasional bursts
of heavy rain are also a concern, so please plan accordingly.
The threat for inclement weather continues on Friday with the
passage of a cold front, which will help to cool temperatures off
a bit, but in return, cause a very windy day across the Northern
Rockies. Southwest Montana, west central Montana, and locations
hugging the Continental Divide will see the strongest winds occur,
though most everywhere will experience a rather windy day. This
could cause further concerns for the wildfire community, so will
be keeping a close eye on this.
With a cooler-than-average weekend ahead, conditions will stay
relatively unsettled but with gradual improvement as the weekend
passes. By next week, forecast models diverge on many details and
the pattern remains unclear at this time.
&&
.AVIATION....Scattered showers and thunderstorms are expected to
impact air terminals KMSO, KGPI, and KSMN this afternoon.
Development has already started, and could impact KMSO and KSMN by
10/2200Z. KGPI could some activity by 11/0000Z this evening. These
thunderstorms will be capable of producing gusty and erratic
winds, along with frequent lightning. Activity is expected to
diminish by 11/0300Z tonight for all terminals.
&&
.MSO WATCHES/WARNINGS/ADVISORIES...
MT...RED FLAG WARNING until 9 PM MDT this evening Bitterroot.
RED FLAG WARNING until 11 PM MDT this evening East Lolo...
Flathead/Glacier Park...Kootenai...Salish and Kootenai
Reservation...West Lolo.
ID...RED FLAG WARNING until 8 PM PDT this evening Clearwater/Nez
perce...Palouse/Hells Canyon.
&&In the hours before
Special weather statement, Aug 10, 5:44 PM MDT, 39 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA MT 544 PM MDT MON AUG 10 2015 MTZ001-110045- KOOTENAI/CABINET REGION MT- 544 PM MDT MON AUG 10 2015 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL LINCOLN COUNTY UNTIL 645 PM MDT... AT 544 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 9 MILES SOUTHEAST OF LIBBY...MOVING NORTH AT 15 MPH. WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... LIBBY AND KOOTENAI FALLS. PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. && LAT...LON 4824 11515 4820 11554 4855 11596 4883 11515 TIME...MOT...LOC 2344Z 172DEG 14KT 4829 11543
Special weather statement, Aug 10, 5:53 PM MDT, 30 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA MT 553 PM MDT MON AUG 10 2015 MTZ005>007-043-110045- MISSOULA/BITTERROOT VALLEYS MT-POTOMAC/SEELEY LAKE REGION MT- BUTTE/BLACKFOOT REGION MT-BITTERROOT/SAPPHIRE MOUNTAINS MT- 553 PM MDT MON AUG 10 2015 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN POWELL... SOUTHEASTERN MISSOULA...NORTHERN GRANITE AND NORTH CENTRAL RAVALLI COUNTIES UNTIL 645 PM MDT... AT 552 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 20 MILES EAST OF STEVENSVILLE...OR 26 MILES NORTHEAST OF HAMILTON... MOVING NORTHEAST AT 25 MPH. WINDS IN EXCESS OF 40 MPH WILL BE LIKELY WITH THIS STORM. WINDS IN EXCESS OF 50+ MPH COULD OCCUR IF THIS LINE OF STORMS STRENGTHENS FURTHER IN TIME. BE AWARE THAT DAMAGING WINDS COULD OCCUR. LOCATIONS IMPACTED INCLUDE... MISSOULA...LOLO...BONNER-WEST RIVERSIDE...FLORENCE...EAST MISSOULA... TWIN CREEKS...GARNET...CLINTON...POTOMAC...QUIGLEY...TURAH... BEARMOUTH AND NIMROD. THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. LAT...LON 4646 11337 4655 11410 4699 11408 4683 11305 TIME...MOT...LOC 2352Z 205DEG 22KT 4645 11368
Special weather statement, Aug 10, 6:06 PM MDT, 17 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA MT 506 PM PDT MON AUG 10 2015 IDZ006>008-110045- OROFINO/GRANGEVILLE REGION ID-SOUTHERN CLEARWATER MOUNTAINS ID- LOWER HELLS CANYON/SALMON RIVER REGION ID- 506 PM PDT MON AUG 10 2015 ...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL IDAHO COUNTY UNTIL 545 PM PDT... AT 506 PM PDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR GRANGEVILLE...MOVING NORTH AT 30 MPH. WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... GRANGEVILLE...CLEARWATER...COTTONWOOD...STITES...FENN AND HARPSTER. LAT...LON 4573 11609 4579 11636 4615 11633 4609 11578 TIME...MOT...LOC 0006Z 190DEG 25KT 4586 11617
Special weather statement, Aug 10, 6:10 PM MDT, 13 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA MT 510 PM PDT MON AUG 10 2015 IDZ006-007-110100- OROFINO/GRANGEVILLE REGION ID-SOUTHERN CLEARWATER MOUNTAINS ID- 510 PM PDT MON AUG 10 2015 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL IDAHO COUNTY UNTIL 600 PM PDT... AT 509 PM PDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 11 MILES SOUTH OF LOWELL...OR 22 MILES EAST OF GRANGEVILLE...MOVING NORTHEAST AT 30 MPH. WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM. FREQUENT LIGHTNING HAS BEEN REPORTED WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... LOWELL AND NEWSOME. ALSO STATE CAMPGROUNDS WILD GOOSE...JOHNSON BAR AND OHARA BAR. LAT...LON 4579 11559 4592 11586 4626 11566 4615 11516 TIME...MOT...LOC 0009Z 209DEG 26KT 4598 11565
Local storm report, Aug 10, 6:21 PM MDT, 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
621 PM MDT MON AUG 10 2015
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0608 PM NON-TSTM WND GST 6 E DARBY 46.03N 114.06W
08/10/2015 M60 MPH RAVALLI MT MESONET
MESONET STATION DEER MOUNTAIN RAWS /DEEM8/
&&
NWS MISSOULA MT
IRIS SYSTEMLocal storm report, Aug 10, 6:23 PM MDT, 0 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
623 PM MDT MON AUG 10 2015
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0622 PM TSTM WND GST 4 SE LOLO 46.72N 114.01W
08/10/2015 M49 MPH MISSOULA MT MESONET
4740 FT.
&&
DTNThe office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 6:04 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Ravalli | 26 min |
| Aug 10, 6:40 PM MDT | Severe Thunderstorm Warning | MSO | Mineral, Missoula, Sanders | 50 min |
| Aug 10, 6:44 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Powell | 61 min |
| Aug 10, 7:18 PM MDT | Severe Thunderstorm Warning | MSO | Lake, Missoula | 42 min |
| Aug 10, 7:56 PM MDT | Special Weather Statement | MSO | Flathead | 49 min |
| Aug 10, 8:13 PM MDT | Special Weather Statement | MSO | Flathead | 47 min |
| Aug 10, 8:50 PM MDT | Special Weather Statement | MSO | Sanders | 55 min |
| Aug 11, 11:26 AM MDT | Red Flag Warning | MSO | Granite, Lewis and Clark, Missoula, Powell, Ravalli | 11 hr |
| Aug 11, 3:21 PM MDT | Special Weather Statement | MSO | Powell | 24 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2015Every severe thunderstorm warning in 2015
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.