Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 3, NWS Billings, MT
NWS Billings, MT issued this severe thunderstorm warning at May 1, 2001, 12:18 AM MDT for Powder River County, Rosebud County, Montana. It was in force for 42 min. 3 reports 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
- May 1, 2001, 12:18 AM MDT (06:18 UTC)
- Expired
- May 1, 2001, 1:00 AM MDT
- In force
- 42 min
- Issued by
- NWS Billings, MT
- Area
- Whole counties
Counties Powder River County, MT, Rosebud County, MT
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 1, 12:35 AM MDT | Thunderstorm Wind 70 E | Colstrip, MT | 70 mph thunderstorm wind gust |
| May 1, 12:50 AM MDT | Thunderstorm Wind 60 E | Broadus, MT | 60 mph thunderstorm wind gust |
| May 1, 1:00 AM MDT | Thunderstorm Wind 60 E | Broadus, MT | 60 mph thunderstorm wind gust |
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
Riverton, WY (KRIW), launched 00:00Z, 6.3 hours before the alert went out and 352 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
- 2788 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 274 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 Billings, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 30, 9:10 PM MDT, 3 hours 8 minutes earlier.
Area forecast discussion, Apr 30, 9:10 PM MDT, 3 hours 8 minutes before
SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
910 PM MDT MON APR 30 2001
.TUE AND WED...
SHORTWAVE SEEN ON WATER VAPOR IMAGERY OVER NORTHERN IDAHO EARLY TONIGHT.
MOISTURE PROGRESSING EASTWARD AHEAD OF THE WAVE AND SURFACE COLD FRONT
HAS JUST GONE THROUGH BUTTE. AS THE FRONT WORKS ITS WAY TO OUR AREA
TONIGHT...SCATTERED SHOWERS WILL SPREAD EASTWARD. THE BIGGEST ISSUE
THROUGH TUESDAY WILL BE THE STRENGTH OF THE WINDS. GUSTY WINDS WILL
LIKELY ACCOMPANY FRONTAL PASSAGE...BUT A TEMPORARY LIMITING FACTOR ON
GUST POTENTIAL WILL BE DEVELOPING NIGHT-TIME LOW LEVEL INVERSIONS. AS
THE SHORTWAVE MOVES OVER NORTH DAKOTA TUESDAY...PARTS OF SOUTH-CENTRAL
AND SOUTHEASTERN MONTANA WILL BE UNDER WAVE SUBSIDENCE...COLD AIR
ADVECTION AND LINKAGE WITH STRONG WINDS ALOFT. EXPECTING STRONGEST WINDS
OVER THE SOUTHEAST TUESDAY AS CURRENT FORECAST INDICATES...BUT BELOW
HIGH WIND WARNING CRITERIA. AS LOW LEVEL INVERSIONS MIX OUT TUESDAY
MORNING...SFC WINDS WILL BEGIN TO LINK WITH STRONGER WINDS ALOFT. 00Z
ETA CONSISTENT WITH FORECASTING 35 KT WINDS AT 850MB...AND 40-50 KT
WINDS AT 700MB TUESDAY.
SO...THE GOING FORECAST IS O.K. BUT WINDS HAVE DIED OFF FROM BILLINGS
EASTWARD. FOR THIS...WILL UPDATE TO FRESHEN UP WORDING A BIT. POPS AND
MIN TEMPS LOOK GOOD TO GO. CANEPA
.THU...FRI...SAT...SUN...MON...
CUTOFF LOW ACROSS THE DESERT SOUTHWEST THURSDAY MODELS DEPICT TO SLOWLY
MEANDER AROUND THEN LIFT NORTHEAST INTO THE GREAT PLAINS SATURDAY AND
SUNDAY. POSITIVELY TILTED RIDGE THEN MOVES INTO THE NORTHERN ROCKIES BY
MONDAY. WILL SLOWLY WARM TEMPS THROUGH THE PERIOD WITH GENERALLY DRY
CONDITIONS EXCEPT DURING THE TIME THE UPPER LOW FILLS AND MOVES OUT OF
THE AREA. THORICHT
TUE WED THU FRI SAT SUN MON
-----------------------------------------------------------
BIL 042/053 036/053 034/057 040/062 043/065 045/068 044/070
42/W 03/W 32/B 22/B 33/W 32/B 22/B
LVM 042/053 034/053 032/056 038/062 041/065 044/068 042/068
43/W 23/W 32/B 22/B 33/W 32/B 22/B
HDN 040/054 034/054 032/058 038/063 041/066 043/069 042/069
42/W 03/W 32/B 22/B 33/W 32/B 22/B
MLS 045/056 038/056 035/058 040/065 043/067 045/071 044/072
43/W 03/W 32/B 22/B 33/W 32/B 22/B
4BQ 044/056 038/056 034/057 038/064 041/065 044/069 042/070
43/W 03/W 32/B 22/B 33/W 32/B 22/B
BHK 043/055 037/055 033/056 037/062 040/064 042/068 041/069
43/W 03/W 32/B 22/B 33/W 32/B 22/B
SHR 038/053 030/053 032/055 036/059 038/065 040/067 039/068
42/W 03/W 32/B 22/B 33/W 32/B 22/BIn the hours before
Local storm report, Apr 30, 9:56 PM MDT, 2 hours 22 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BILLINGS, MT
956 PM MDT MON APR 30 2001
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1100 PM BILLINGS AIRPORT MT 69 MPH TSTM WIND GUST
04/30/01 YELLOWSTONE
1235 AM COLSTRIP MT 70 MPH TSTM WIND GUST
05/01/01 ROSEBUD
1250 AM BROADUS MT 60 MPH TSTM WIND GUST
05/01/01 POWDER RIVER
1158 PM CROW AGENCY MT 65 MPH TSTM WIND GUST
04/30/01 BIG HORN
0100 AM SHERIDAN WY 76 MPH TSTM WIND GUST
05/01/01 SHERIDANThe office that day
Everything else NWS Billings, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 10:48 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 57 min |
| Apr 30, 11:42 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 48 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.