Alert archive / Montana / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 76, NWS Glasgow, MT
NWS Glasgow, MT issued this severe thunderstorm warning at Jul 16, 2001, 8:09 PM MDT for Petroleum County, Montana. It was in force for 66 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
- Jul 16, 2001, 8:09 PM MDT (02:09 UTC)
- Expired
- Jul 16, 2001, 9:15 PM MDT
- In force
- 66 min
- Issued by
- NWS Glasgow, MT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Petroleum County, MT
The radar
The Billings radar (KBLX), 143 km from the middle of the area, began a volume at 02:09 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 |
|---|---|---|---|
| Jul 16, 8:20 PM MDT | Thunderstorm Wind 52 M | Winnett, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 16, 4:45 PM MDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 2.2 hours before the alert went out and 181 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
- 1094 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -82 m²/s²
- 0-3 km storm-relative helicity
- 113 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 Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 16, 2:51 PM MDT, 5 hours 18 minutes earlier.
Area forecast discussion, Jul 16, 2:51 PM MDT, 5 hours 18 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
200 PM MDT MON JUL 16 2001
...CORRECTED FOR POPS IN THE CCF...AND ADD FFA FOR ZONES 016 AND
022...
SHORT TERM...QUIET AFTERNOON ACROSS NORTHEAST MONTANA...A CU FIELD
ACROSS THE EXTREME NORTHEASTERN ZONES...OTHERWISE SKY CLEAR ACROSS
THE REMAINDER OF THE CWFA. TEMPERATURES SLOWLY WARMING INTO THE 80S
ACROSS THE REGION. 12Z SOUNDING AT GGW SHOWED A CONVECTIVE
TEMPERATURE OF 83...THEREFORE MOST AREAS NEARING THIS MARK AND CU
SHOULD BEGIN TO FIRE UP ALL OVER THE AREA.
ETA/MESO ETA SEEMS TO HAVE A GOOD HANDLE ON THE SITUATION FOR THIS
EVENING INTO TONIGHT FOR THE REGION. A WAVE MOVES THROUGH THE FLOW
AND SHOULD MOVE INTO THE WESTERN ZONES BY 3Z. THE ROCKIES WEAKEN THE
VORT AS IT MOVES ACROSS THEM...THEN THE MODEL SPINS UP THE VORT OVER
THE CWA BETWEEN 3-6Z. BEST OMEGA IS OVER THE SOUTHERN ZONES OVER
NIGHT...HOWEVER THE ENTIRE CWFA SHOULD HAVE SOME TSRA TONIGHT INTO
THE OVERNIGHT HOURS.
TUESDAY...MORE SW FLOW WITH ANOTHER EVENING SHORTWAVE FOR MORE
EVENING THUNDERSTORMS...HOWEVER OMEGA REMAINS POSITIVE FOR MOST OF
THE DAY WITH NO REAL CHANGE IN THE LOW LEVEL ATMOSPHERIC
CONDITIONS...THEREFORE TSRA WILL BE AN OPTION FOR THE ENTIRE DAY.
WEDNESDAY...THE UPPER LOW SHIFTS A BIT EASTWARD...HOWEVER FOR
EASTERN MONTANA...LITTLE CHANGE. MORE PM TSRA.
TEMPS...GOING TOWARDS A WARMER OVERNIGHT LOW TEMPS IN THE
VALLEYS...AND TREND SLIGHTLY ABOVE GUIDANCE NUMBERS. PROTON
EXTENDED...EXTENDED MODEL SOLUTIONS REMAIN CONSISTENT IN OVERALL
PATTERN THROUGH DAY 7. WILL CONTINUE TO SEE SW FLOW ALOFT WITH CHC
FOR TSRA THU AND FRI. CUTOFF LOW FORMS OVER NRN CA ON SAT WHICH
SHOULD ALLOW FLOW TO TURN MORE WRLY OR EVEN NWERLY OVER MT FOR DRIER
CONDS THIS WKEND. H5 HEIGHTS/THICKNESSES DONT CHG APPRECIABLY
THROUGH DAY 7. DRIER SFC AIR SHOULD MAKE FOR HIGHER DAYTIME TEMPS
WHICH WOULD CANCEL OUT ANY COOL ADVECTION WE WOULD GET ON NW FLOW.
SO WONT STRAY FROM CLIMO ON EXTENDED TEMPS. WRIGHT
KGGW 065/082 063/082 062/081 062/082 058/083 056/085 058/084
TTTTBBB 946333/9533222
KGDV 066/086 064/084 062/084 061/083 057/083 058/085 058/084
TTTTBBB 945233/9533222
.GGW...FLASH FLOOD WATCH ZONES 016 AND 022.The office that day
Everything else NWS Glasgow, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 5:36 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 54 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.