Alert archive / Montana / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 18, NWS Glasgow, MT
NWS Glasgow, MT issued this severe thunderstorm warning at Jul 11, 2017, 5:03 PM MDT for Phillips County, Valley County, Montana. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 11, 2017, 5:03 PM MDT (23:03 UTC)
- Expired
- Jul 11, 2017, 6:00 PM MDT
- In force
- 57 min
- Issued by
- NWS Glasgow, MT
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Phillips County, MT, Valley County, MT
The radar
The Glasgow radar (KGGW), 51 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.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 11.1 hours before the alert went out and 264 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
- 1086 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- -64 m²/s²
- 0-3 km storm-relative helicity
- 13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What 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 Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 11, 2:59 PM MDT, 2 hours 4 minutes earlier.
Area forecast discussion, Jul 11, 2:59 PM MDT, 2 hours 4 minutes before
Area Forecast Discussion National Weather Service Glasgow MT 259 PM MDT Tue Jul 11 2017 .SHORT TERM...for northeast Montana...tonight through Thu... Upper level low pressure system over southern Saskatchewan will continue to aid isolated to scattered showers and thunderstorms into the evening hours, diminishing after midnight. Wednesday: High pressure ridge begins to rebuild over the region with warming MAX temps and decreasing Min RH values. Thursday: High pressure strengthens over the region with Max temps back into the mid 90s to lower 100s and RH values falling back into the teens. tc .LONG TERM...Thu night through Tue... Going forecast was just blended with the 12z guidance sans the ECMWF. Mainly hot and dry weather expected with a break coming about Tuesday when the max temperatures are expected to drop back into the lower 90s most places (from near 100 Sunday). Models continue to disagree on showers behind the cold front next week. Hopefully, this will materialize for some needed rainfall over the next several days. TFJ Previous Discussion... The long term period begins Wednesday night and Thursday with the shortwave trough pushing further downstream while a strong upper level ridge once again becomes established across the western U.S. Expect a return to hot and dry weather conditions. The upper ridge only strengthens through the end of the week and persists right on through at least the first part of the weekend. During this time forecast highs will be in the 90s and low 100s each day with little, if any measurable rainfall. Latest 00z models continue to differ some on evolution of the pattern late in the weekend and early next week. The 00z ECMWF has the ridge axis sliding east of the forecast area into the Dakotas with warm upper level southwest flow aloft on the backside while a cold front approaches for forecast area. The GFS keeps the ridge parked over the western U.S. right on through the period, though does introduce some flattening late in the weekend and early next week, keeping Montana on the northern periphery and becoming influenced more by embedded shortwaves in the flow which could generate chances for showers and thunderstorms. The bottom line is that a return to hot and dry conditions is in the cards for the second half of this week and into the weekend, but some uncertainty exists late in the weekend and early next week due to increasing model solution differences. Maliawco && .AVIATION... VFR, but possible MVFR late tonight. Another cold front will drop in from the north tonight bringing low clouds to KGGW...KOLF...and KSDY late tonight/early Wednesday. Winds: NW today at 10-20 kts this afternoon will turn clockwise to the north and diminish this evening to less than 10 kts. Continued light winds are expected Wednesday. TFJ && .GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE. && weather.gov/glasgow
Hazardous weather outlook, Jul 11, 3:02 AM MDT, 14 hours 1 minute before
Hazardous Weather Outlook National Weather Service Glasgow MT 302 AM MDT Tue Jul 11 2017 MTZ016>027-059>062-120915- Central and Southeast Phillips-Central and Southern Valley- Daniels-Sheridan-Western Roosevelt-Petroleum-Garfield-McCone- Richland-Dawson-Prairie-Wibaux-Northern Phillips- Southwest Phillips-Northern Valley-Eastern Roosevelt- 302 AM MDT Tue Jul 11 2017 This Hazardous Weather Outlook is for portions of northeast Montana. .DAY ONE...Today and Tonight The probability for widespread hazardous weather Today and Tonight is low. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Hot temperatures with highs in the 90s to near 100 return on Thursday and will continue through the weekend. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures.
In the hours before
Special weather statement, Jul 11, 12:55 PM MDT, 4 hours 8 minutes before
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</html>The office that day
Everything else NWS Glasgow, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 6:01 PM MDT | Special Weather Statement | GGW | Richland | 44 min |
| Jul 10, 6:04 PM MDT | Special Weather Statement | GGW | Valley | 41 min |
| Jul 10, 6:18 PM MDT | Special Weather Statement | GGW | Dawson, Richland | 42 min |
| Jul 10, 6:48 PM MDT | Special Weather Statement | GGW | Daniels, Roosevelt, Sheridan | 42 min |
| Jul 10, 7:14 PM MDT | Special Weather Statement | GGW | Wibaux | 46 min |
| Jul 10, 7:32 PM MDT | Severe Thunderstorm Warning | GGW | Dawson, Prairie, Richland, Wibaux | 35 min |
| Jul 11, 2:56 AM MDT | Special Weather Statement | GGW | Phillips | 49 min |
| Jul 11, 3:42 AM MDT | Special Weather Statement | GGW | Phillips | 63 min |
| Jul 11, 4:38 AM MDT | Special Weather Statement | GGW | Valley | 52 min |
| Jul 11, 5:28 AM MDT | Special Weather Statement | GGW | Daniels, Roosevelt | 62 min |
| Jul 11, 6:24 AM MDT | Special Weather Statement | GGW | Roosevelt, Sheridan | 36 min |
| Jul 11, 6:50 AM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Sheridan | 55 min |
| Jul 11, 12:55 PM MDT | Special Weather Statement | GGW | Sheridan | 35 min |
| Jul 11, 4:47 PM MDT | Special Weather Statement | GGW | Phillips | 43 min |
| Jul 11, 4:50 PM MDT | Special Weather Statement | GGW | 40 min | |
| Jul 11, 5:26 PM MDT | Special Weather Statement | GGW | Valley | 64 min |
| Jul 11, 5:32 PM MDT | Special Weather Statement | GGW | 43 min | |
| Jul 11, 5:38 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 67 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.