Alert archive / Montana / Severe Thunderstorm Warnings in 2006
Severe Thunderstorm Warning 1, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at May 20, 2006, 2:41 PM MDT for Chouteau County, Montana. It was in force for 64 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
- May 20, 2006, 2:41 PM MDT (20:41 UTC)
- Expired
- May 20, 2006, 3:45 PM MDT
- In force
- 64 min
- Issued by
- NWS Great Falls, MT
- Area
- Counties, with a storm outline in the text
County Chouteau County, MT
The radar
The Great Falls radar (KTFX), 85 km from the middle of the area, began a volume at 20:41 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 20, 12:24 PM MDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 8.7 hours before the alert went out and 48 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
- 2032 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -25 m²/s²
- 0-3 km storm-relative helicity
- 72 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 Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at May 20, 12:05 PM MDT, 2 hours 36 minutes earlier.
Area forecast discussion, May 20, 12:05 PM MDT, 2 hours 36 minutes before
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</html>Hazardous weather outlook, May 20, 1:32 PM MDT, 1 hour 9 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE GREAT FALLS MT 132 PM MDT SAT MAY 20 2006 MTZ012>015-046-048>055-211200- CASCADE-CHOUTEAU-CENTRAL AND SOUTHERN LEWIS AND CLARK-MADISON- EASTERN PONDERA-SOUTHERN ROCKY MOUNTAIN FRONT-EASTERN TETON- JUDITH BASIN-FERGUS-JEFFERSON-BROADWATER-MEAGHER-GALLATIN- 132 PM MDT SAT MAY 20 2006 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MONTANA...NORTH CENTRAL MONTANA AND SOUTHWEST MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT THERE IS A RISK OF SEVERE THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS THIS AFTERNOON AND EARLY THIS EVENING. THUNDERSTORMS WILL CONTINUE TO DEVELOP OVER THE MOUNTAINS OF SOUTHWEST MONTANA THEN INTENSIFY AS THEY MOVE INTO CENTRAL MONTANA. THEREFORE...A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR MOST OF SOUTHWEST AND CENTRAL MONTANA...AND IS IN EFFECT UNTIL 8 PM MDT. THE THUNDERSTORMS SHOULD MOVE EAST OF THE AREA BY DARK. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MTZ009>011-044-045-047-211200- NORTHERN ROCKY MOUNTAIN FRONT-EASTERN GLACIER-HILL-TOOLE-LIBERTY- BLAINE- 132 PM MDT SAT MAY 20 2006 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS WILL SPREAD NORTHEAST INTO NORTH CENTRAL MONTANA THIS AFTERNOON AND EARLY THIS EVENING. A FEW STORMS MAY EVEN BECOME SEVERE WITH STRONG GUSTY WINDS AND HAIL GREATER THAN ONE HALF INCH IN DIAMETER. THESE STORMS WILL MOVE EAST OF THE AREA AROUND DARK. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MTZ008-211200- BEAVERHEAD- 132 PM MDT SAT MAY 20 2006 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP OVER BEAVERHEAD COUNTY THIS AFTERNOON AND SPREAD NORTHEAST. A FEW STORMS MAY EVEN BECOME SEVERE WITH STRONG GUSTY WINDS AND HAIL GREATER THAN ONE HALF INCH IN DIAMETER. THESE STORMS WILL DIMINISH BY DARK. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
In the hours before
Local storm report, May 20, 2:23 PM MDT, 18 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
223 PM MDT SAT MAY 20 2006
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1245 AM TSTM WND GST DILLON 45.22N 112.63W
05/20/2006 M53.00 MPH BEAVERHEAD MT MESONET
DILLON RAWS LOCATION
1015 AM TSTM WND GST 8 SW GRANT 44.93N 113.18W
05/20/2006 M54.00 MPH BEAVERHEAD MT MESONET
BRENNER RAWS LOCATION
0130 PM HAIL 25 N BOZEMAN 46.04N 111.04W
05/20/2006 E0.25 INCH GALLATIN MT TRAINED SPOTTER
HEAVY RAIN AND BRIEF HAIL.
0135 PM HAIL 5 W BOZEMAN 45.68N 111.15W
05/20/2006 E0.25 INCH GALLATIN MT TRAINED SPOTTER
HEAVY RAIN AND BRIEF HAIL.
0145 PM HAIL 20 S RINGLING 45.98N 110.81W
05/20/2006 E0.50 INCH GALLATIN MT TRAINED SPOTTER
OCCURRED NEAR WILSALL WITH GUSTY WINDS.
&&
SAUCIERThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 3:45 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau | 35 min |
| May 20, 4:23 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 67 min |
| May 20, 5:05 PM MDT | Severe Thunderstorm Warning | TFX | Hill | 25 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2006Every severe thunderstorm warning in 2006
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.