Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 87, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Aug 4, 2001, 4:00 PM MDT for Meagher County, Montana. It was in force for 30 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 4, 2001, 4:00 PM MDT (22:00 UTC)
- Expired
- Aug 4, 2001, 4:30 PM MDT
- In force
- 30 min
- Issued by
- NWS Great Falls, MT
- Area
- Whole counties
County Meagher County, MT
The radar
The Great Falls radar (KTFX), 103 km from the middle of the area, began a volume at 22:00 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 4, 4:20 PM MDT | Thunderstorm Wind 52 E | White Sulphur Spgs, MT | Actual event location White Sulphur Springs 22 NW...Estimated 52 kt winds damaged window screens by tearing them out of windows. |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 4, 2:00 PM MDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 10.0 hours before the alert went out and 98 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
- 38 J/kg
- Mixed-layer CIN
- -272 J/kg
- Mixed-layer LCL
- 2483 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- -70 m²/s²
- 0-3 km storm-relative helicity
- -33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KTFX 042201 SVRGTF MTC059-042230- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 400 PM MDT SAT AUG 4 2001 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHWESTERN MEAGHER COUNTY IN CENTRAL MONTANA * UNTIL 430 PM MDT * AT 355 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER EXTREME NORTHWESTERN MEAGHER COUNTY...OR ABOUT 29 MILES NORTHWEST OF WHITE SULPHUR SPRINGS...MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... RURAL NORTHWESTERN MEAGHER COUNTY AT 410 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. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM MDT SATURDAY EVENING FOR WESTERN MONTANA. LAT...LON 4684 11153 4671 1)1134 4695 11095 4703 11112
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 4, 3:00 PM MDT, 1 hour earlier.
Area forecast discussion, Aug 4, 3:00 PM MDT, 1 hour before
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 3 PM MDT SAT AUG 4 2001 THUNDERSTORMS FORMING ALONG BACK EDGE OF DRY SLOT...PER WATER VAPOR IMAGERY...A FAVORED LOCATION. IN COORD WITH SPC AND OTHER MT OFFICES...SVR TSTM WATCH ISSUED TILL 7 PM. AXIS OF S/W STILL WEST OF MT AND WILL TRAVERSE CWA BETWEEN 00-06Z. THREAT OF DEEP CONVECTION CONTINUES... NOW TILL ABOUT 01Z...THEN MAINLY SCATTERED SHOWERS TILL MIDNIGHT. BEYOND THAT...MODELS IN FAIR AGREEMENT. NEXT COUPLE OF DAYS...UPPER RIDGE BUILDS BACK INTO MT....FLOW BECOMES DRIER AND MORE WESTERLY. QUITE WARM WITH LITTLE THREAT OF PCPN. MIELKE. EXTENDED FORECAST DISCUSSION... RIDGE WILL CONTINUE WITH SOME DECREASE IN HEIGHTS BY WED. DO EXPECT A LITTLE MORE TROFFING BY LATER IN THE PERIOD...SO THIS SHOULD KEEP IT WARM THROUGH TUESDAY. WITH THE DECREASE IN HEIGHTS...TEMPS WILL COOLE INTO THE 70S AND 80S WITH SCATTERED SHOWERS/TSTMS. CCF NUMBERS GTF UU 056 087 053 090 055 014001 CTB UU 052 082 052 085 053 013001 HLN UU 055 088 055 092 055 014101 BZN UU 052 090 052 093 054 014001 WEY UU 044 082 042 085 045 015111 DLN UU 048 086 050 089 051 014001 HVR UU 062 090 057 095 057 014001 LWT UU 056 087 056 090 056 014201
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 1:17 PM MDT | Severe Thunderstorm Warning | TFX | Beaverhead | 28 min |
| Aug 4, 1:28 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark | 47 min |
| Aug 4, 2:15 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 60 min |
| Aug 4, 2:18 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson | 27 min |
| Aug 4, 3:12 PM MDT | Severe Thunderstorm Warning | TFX | Lewis and Clark | 63 min |
| Aug 4, 3:39 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 66 min |
| Aug 4, 3:49 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 26 min |
| Aug 4, 3:59 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater | 31 min |
| Aug 4, 4:09 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 51 min |
| Aug 4, 4:43 PM MDT | Severe Thunderstorm Warning | TFX | Cascade | 32 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2001Every severe thunderstorm warning in 2001
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.