Alert archive / Montana / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 13, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Jul 15, 2017, 4:59 PM MDT for Missoula County, Ravalli County, Montana. It was in force for 46 min. 3 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
- Jul 15, 2017, 4:59 PM MDT (22:59 UTC)
- Expired
- Jul 15, 2017, 5:45 PM MDT
- In force
- 46 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Missoula County, MT, Ravalli County, MT
The radar
The Missoula radar (KMSX), 37 km from the middle of the area, began a volume at 23:03 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 |
|---|---|---|---|
| Jul 15, 4:59 PM MDT | TSTM WND DMG | 3 E Florence, MT | A LARGE TREE FELL ONTO A HOUSE AND BROKE THE SKYLIGHT. |
| Jul 15, 4:59 PM MDT | NON-TSTM WND GST 60 | 3 E Florence, MT | WIND GUSTS 50 TO 60 MPH AND HEAVY RAIN. |
| Jul 15, 5:42 PM MDT | TSTM WND GST 60 | 2 Nw Clinton, MT | POWER OUTAGE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 11.0 hours before the alert went out and 221 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
- 2875 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
435
WUUS55 KMSO 152259
SVRMSO
MTC063-081-152345-
/O.NEW.KMSO.SV.W.0013.170715T2259Z-170715T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Missoula MT
459 PM MDT SAT JUL 15 2017
The National Weather Service in Missoula has issued a
* Severe Thunderstorm Warning for...
Southeastern Missoula County in west central Montana...
North central Ravalli County in west central Montana...
* Until 545 PM MDT
* At 458 PM MDT, a severe thunderstorm was located over Florence, or
16 miles south of Missoula, moving northeast at 30 mph.
HAZARD...60 mph wind gusts, heavy rain and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Missoula, Lolo, Bonner-West Riverside, Florence, East Missoula,
Clinton and Turah.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Wind damage with this storm will occur before any rain or lightning.
Do not wait for the sound of thunder before taking cover. SEEK
SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.
&&
LAT...LON 4680 11352 4666 11379 4666 11382 4664 11382
4652 11404 4668 11433 4700 11398
TIME...MOT...LOC 2258Z 224DEG 26KT 4664 11410
HAIL...0.75IN
WIND...60MPH
$$1 follow-up statement
132
WWUS55 KMSO 152339
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
539 PM MDT SAT JUL 15 2017
MTC063-081-152349-
/O.EXP.KMSO.SV.W.0013.000000T0000Z-170715T2345Z/
Missoula MT-Ravalli MT-
539 PM MDT SAT JUL 15 2017
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MISSOULA AND
NORTH CENTRAL RAVALLI COUNTIES WILL EXPIRE AT 545 PM MDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.
LAT...LON 4680 11352 4666 11379 4666 11382 4664 11382
4652 11404 4668 11433 4700 11398
TIME...MOT...LOC 2339Z 224DEG 26KT 4685 11381
$$The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 6:16 PM MDT | Special Weather Statement | MSO | Missoula | 29 min |
| Jul 14, 7:57 PM MDT | Special Weather Statement | MSO | Missoula | 33 min |
| Jul 15, 2:00 PM MDT | Red Flag Warning | MSO | Flathead, Glacier, Granite, Lake, Lewis and Clark, Lincoln and 5 more | 31 hr |
| Jul 15, 2:29 PM MDT | Special Weather Statement | MSO | Deer Lodge | 46 min |
| Jul 15, 2:58 PM MDT | Special Weather Statement | MSO | Ravalli | 62 min |
| Jul 15, 3:35 PM MDT | Special Weather Statement | MSO | Ravalli | 40 min |
| Jul 15, 4:03 PM MDT | Special Weather Statement | MSO | Ravalli | 27 min |
| Jul 15, 4:16 PM MDT | Special Weather Statement | MSO | Ravalli | 59 min |
| Jul 15, 4:27 PM MDT | Severe Thunderstorm Warning | MSO | Missoula, Ravalli | 33 min |
| Jul 15, 5:13 PM MDT | Special Weather Statement | MSO | Deer Lodge | 47 min |
| Jul 15, 5:41 PM MDT | Areal Flood Advisory | MSO | Deer Lodge | 64 min |
| Jul 15, 5:49 PM MDT | Special Weather Statement | MSO | Missoula | 41 min |
| Jul 15, 5:53 PM MDT | Special Weather Statement | MSO | Powell | 52 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2017Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.