Alert archive / Montana / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 3, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at May 6, 2017, 2:42 PM MDT for Deer Lodge County, Granite County, Montana. It was in force for 33 min. 1 report 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
- May 6, 2017, 2:42 PM MDT (20:42 UTC)
- Expired
- May 6, 2017, 3:15 PM MDT
- In force
- 33 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
Counties Deer Lodge County, MT, Granite County, MT
The radar
The Missoula radar (KMSX), 110 km from the middle of the area, began a volume at 20:44 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 |
|---|---|---|---|
| May 6, 2:42 PM MDT | HAIL 1.25 | 1 W Georgetown, MT | TRAINED SPOTTERS ESTIMATED QUARTER AND HALF DOLLAR SIZED HAIL STONES. THEY WERE WORRIED ABOUT VEHICLE DAMAGE. DID NOT GO OUTSIDE YET TO CHECK VEHICLES. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 8.7 hours before the alert went out and 232 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
- 1696 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -30 m²/s²
- 0-3 km storm-relative helicity
- 166 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
436
WUUS55 KMSO 062042
SVRMSO
MTC023-039-062115-
/O.NEW.KMSO.SV.W.0003.170506T2042Z-170506T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Missoula MT
242 PM MDT SAT MAY 6 2017
The National Weather Service in Missoula has issued a
* Severe Thunderstorm Warning for...
North central Deer Lodge County in west central Montana...
Southeastern Granite County in west central Montana...
* Until 315 PM MDT
* At 241 PM MDT, Doppler radar indicated a severe thunderstorm
capable of producing quarter size hail and damaging winds in excess
of 60 mph. This storm was located 8 miles south of Philipsburg, or
16 miles west of Anaconda, and moving northeast at 40 mph.
* Locations impacted include...
Philipsburg, Porters Corner, Princeton and Georgetown.
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.
In addition to large hail and damaging winds, continuous cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Lightning is one of nature's leading killers. Remember,
if you can hear thunder, you are close enough to be struck by
lightning.
&&
LAT...LON 4609 11325 4628 11345 4647 11310 4641 11303
4627 11303 4627 11287 4622 11282
TIME...MOT...LOC 2041Z 235DEG 33KT 4621 11327
$$2 follow-up statements
449
WWUS55 KMSO 062104
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
304 PM MDT SAT MAY 6 2017
MTC023-039-062115-
/O.CON.KMSO.SV.W.0003.000000T0000Z-170506T2115Z/
Deer Lodge MT-Granite MT-
304 PM MDT SAT MAY 6 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM MDT
FOR NORTH CENTRAL DEER LODGE AND EAST CENTRAL GRANITE COUNTIES...
At 303 PM MDT, trained weather spotters reported a severe
thunderstorm producing half dollar size hail and damaging winds in
excess of 50 mph. This storm was located 12 miles north of West
Valley, or 14 miles north of Anaconda, moving northeast at 40 mph.
Locations impacted include...
Philipsburg and Princeton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
In addition to large hail and damaging winds, continuous cloud to
ground lightning is occurring with this storm. Move indoors
immediately. Lightning is one of nature's leading killers. Remember,
if you can hear thunder, you are close enough to be struck by
lightning.
&&
LAT...LON 4618 11316 4636 11331 4647 11310 4641 11303
4627 11303 4627 11287 4626 11286 4622 11297
TIME...MOT...LOC 2103Z 235DEG 33KT 4633 11302
$$413
WWUS55 KMSO 062113
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
313 PM MDT SAT MAY 6 2017
MTC023-039-062122-
/O.EXP.KMSO.SV.W.0003.000000T0000Z-170506T2115Z/
Deer Lodge MT-Granite MT-
313 PM MDT SAT MAY 6 2017
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL DEER LODGE AND
EAST CENTRAL GRANITE COUNTIES WILL EXPIRE AT 315 PM MDT...
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire. However, small
hail, gusty winds, and heavy rain are still possible with this
thunderstorm.
LAT...LON 4618 11316 4636 11331 4647 11310 4641 11303
4627 11303 4627 11287 4626 11286 4622 11297
TIME...MOT...LOC 2112Z 235DEG 33KT 4637 11293
$$The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 5, 6:34 PM MDT | Special Weather Statement | MSO | Deer Lodge | 71 min |
| May 5, 6:57 PM MDT | Special Weather Statement | MSO | Missoula | 48 min |
| May 5, 7:39 PM MDT | Special Weather Statement | MSO | Sanders | 51 min |
| May 5, 7:52 PM MDT | Special Weather Statement | MSO | Lincoln | 68 min |
| May 6, 12:11 PM MDT | Special Weather Statement | MSO | 49 min | |
| May 6, 12:55 PM MDT | Special Weather Statement | MSO | Ravalli | 50 min |
| May 6, 1:26 PM MDT | Severe Thunderstorm Warning | MSO | Ravalli | 34 min |
| May 6, 2:07 PM MDT | Special Weather Statement | MSO | Deer Lodge | 23 min |
| May 6, 2:22 PM MDT | Severe Thunderstorm Warning | MSO | Deer Lodge, Granite | 23 min |
| May 6, 2:31 PM MDT | Special Weather Statement | MSO | Silver Bow | 44 min |
| May 6, 3:16 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 29 min |
| May 6, 3:41 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 34 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.