Alert archive / Montana / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 106, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Aug 18, 2000, 4:16 PM MDT for Gallatin County, Montana. It was in force for 29 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 18, 2000, 4:16 PM MDT (22:16 UTC)
- Expired
- Aug 18, 2000, 4:45 PM MDT
- In force
- 29 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
County Gallatin County, MT
The radar
The Billings radar (KBLX), 202 km from the middle of the area, began a volume at 22:20 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 18, 4:20 PM MDT | Hail 1.5 | Maudlow, MT |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 10.3 hours before the alert went out and 218 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
- 3 J/kg
- Mixed-layer CIN
- -482 J/kg
- Mixed-layer LCL
- 2601 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
786 WUUS55 KTFX 182218 SVRGTF MTC031-182245- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 416 PM MDT FRI AUG 18 2000 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHEASTERN GALLATIN COUNTY IN SOUTHWEST MONTANA * UNTIL 445 PM MDT * AT 415 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER MAUDLOW...OR ABOUT 26 MILES NORTH OF BOZEMAN...MOVING NORTHEAST AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE CONTINUE OVER... RURAL NORTHERN GALLATIN COUNTY THROUGH 445 PM MDT REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN GREAT FALLS. $$ LAT...LON 4606 11130 4593 11112 4610 11082 4619 11094
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 Aug 18, 3:00 PM MDT, 1 hour 16 minutes earlier.
Area forecast discussion, Aug 18, 3:00 PM MDT, 1 hour 16 minutes before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 300 PM MDT FRI AUG 18 2000 WEAK SHORT WAVE NORTHERN GREAT BASIN HAS FIRED OFF THUNDERSTORMS EAST OF BOZEMAN...WHICH ARE WEAKENING ON RADAR. SATELLITE PICTURES SHOW MORE MOISTURE WEST OF AREA...SO ISOLATED EVENING...MOSTLY DRY...THUNDERSTORMS WITH GUSTY WINDS EXPECTED SOUTHWEST AND CENTRAL...ESPECIALLY OVER THE MOUNTAINS SINCE SURFACE DEWPOINTS SO LOW. THERMAL TROUGH IN AREA AND TFX VAD WIND PROFILE SHOWS SOUTHWEST WIND 15 KT JUST ABOVE SURFACE. EXPECT SOUTHWEST WINDS TO DEVELOP ON SURFACE SOON...BROWNING ALREADY GUSTING TO 22KT FROM SOUTHWEST. WINDS ALOFT WILL BE INCREASING TONIGHT AND SATURDAY...WHICH WILL BE A SERIOUS FIRE WEATHER THREAT. DUE TO DIURNAL COOLING...EXPECT GUSTY WEST WINDS MAINLY HIGHER ELEVATIONS TONIGHT AND ALL ELEVATIONS SATURDAY. FAIRLY VIGOROUS SHORT WAVE MOVING INTO AREA SATURDAY NIGHT AND EASTWARD SUNDAY. FAIRLY GOOD RAIN OCCURRING WESTERN WASHINGTON...SO EXPECT SLIGHT CHANCE OF THUNDERSTORMS SATURDAY THROUGH SUNDAY IN AREA...EXCEPT SHOWERS MORE NUMEROUS NORTHERN ROCKIES. OARD EXTENDED DISCUSSION...MODELS IN UNUSUALLY GOOD AGREEMENT WITH TRENDS DURING THE PERIOD...ESPECIALLY THE ECMWF AND MRF. AS FAR AS THOSE TWO MODELS ARE CONCERNED BOTH BRING IN A WEAK POSITIVELY TILTED SHORTWAVE ON MON. UPPER RIDGE IS THEN FORECAST OVER AREA ON TUE BEFORE A ANOTHER WEAK SHORTWAVE MOVES THROUGH FORECAST AREA ON WED. EVEN WITH SHORTWAVES MRF LOOKS DRY. ABOUT ONLY THREAT OF A THUNDERSTORM MIGHT BE OVER THE FAR S BUT WILL GO MOSTLY DRY THERE. ECMWF..MRF..CMC..AND NOGAPS ALL AGREE ON RISING THICKNESSES THROUGH PERIOD FOR A WARMING TREND. CCF NUMBERS GTF NN 054/077 047/070 044 160122 CTB NN 050/073 043/066 040 160122 HLN NN 053/078 048/072 046 161222 BZN NN 050/082 047/073 043 161222 WEY KK 037/078 037/068 030 162222 DLN NN 052/078 047/070 044 161222 HVR NN 055/082 050/074 048 160122 LWT NN 052/078 046/068 042 161122
Nearby
Severe Thunderstorm Warnings in Montana, 2000Every severe thunderstorm warning in 2000
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.