Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 99, NWS Billings, MT

June 30, 2001Powder River County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jun 30, 2001, 1:58 AM MDT for Powder River County, Montana. It was in force for 32 min. 2 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: Jun 30, 2001, 1:58 AM MDT (07:58 UTC)
Expired: Jun 30, 2001, 2:30 AM MDT
In force: 32 min
Issued by: NWS Billings, MT
Area: Whole counties

County Powder River County, MT

The radar

The Billings radar (KBLX), 237 km from the middle of the area, began a volume at 08:01 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
Jun 30, 2:20 AM MDT	Hail 1.75	Biddle, MT	Hail covered the ground
Jun 30, 2:20 AM MDT	Hail 1.75	Biddle, MT	Hail covered the ground. Some broken 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
Jun 29, 11:00 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 8.0 hours before the alert went out and 262 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 917 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 2203 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

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 Jun 29, 8:46 PM MDT, 5 hours 12 minutes earlier.

Area forecast discussion, Jun 29, 8:46 PM MDT, 5 hours 12 minutes before

SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
846 PM MDT FRI JUN 29 2001

.SAT AND SUN...

SEVERE THUNDERSTORM WATCH STILL CONTINUES IN THE WESTERN ZONES UNTIL
1100 PM. SUBTLE SHORTWAVE SEEN ON WATER VAPOR IMAGERY MIGHT HELP BREAK
THE CAP FOR CONVECTIVE INITIATION. SO FAR...JUST SOME WEAK CONVECTION...
WHICH COULD HELP TO ERODE THE CAP. THE NEW ETA APPEARS TO KEEP THE MAIN
ACTION NORTH OF THE MT/WY BORDER. THEREFORE WILL UPDATE THE WYOMING
ZONES TO BRING DOWN THE POPS. OTHERWISE...NO OTHER UPDATES. STROBIN

.MON...TUE...WED...THU...FRI...
MID CONTINENT RIDGE OF HIGH PRESSURE WILL MOVE WEST AND CENTER NEAR THE
WEST COAST BY WEDNESDAY. A CANADIAN COOL FRONT WILL MOVE INTO THE MID
SECTION OF THE U.S. BEGINNING WEDNESDAY. THIS WILL BRING THE WARMEST DAY
TO THE NORTHERN ROCKIES ON TUESDAY WITH COOLING THROUGH THE REMAINDER OF
THE WEEK. AS THE RIDGE SHIFTS WEST...SUBSIDENCE IN THE RIDGE WILL LIMIT
THUNDERSTORM DEVELOPMENT TO MAINLY DRY CONDITIONS THROUGH THURSDAY
WITH INCREASING CHANCES OF THUNDERSTORMS FRIDAY AS A WARMER RETURN FLOW
DEVELOPS ACROSS THE AREA. GUIDANCE TEMPERATURES WERE A BIT TOO LOW FOR
TUESDAY AND WENT WITH LOCALLY DEVELOPED NUMBERS INSTEAD. THORICHT

    SAT     SUN     MON     TUE     WED     THU     FRI
-----------------------------------------------------------
BIL 063/082 062/083 058/082 056/086 057/083 056/082 054/083
    44/T    43/T    22/B    22/B    22/B    22/B    33/T
LVM 055/082 055/081 055/080 052/082 053/080 052/079 050/080
    33/T    33/T    22/B    22/B    22/B    22/B    33/T
HDN 061/083 060/085 057/084 054/088 055/085 053/084 051/084
    44/T    43/T    22/B    22/B    22/B    22/B    33/T
MLS 065/084 064/085 059/085 060/088 059/083 055/082 054/084
    33/T    64/T    22/B    22/B    22/B    22/B    33/T
4BQ 065/084 063/083 058/083 058/087 057/082 054/081 053/083
    33/T    64/T    22/B    22/B    22/B    22/B    33/T
BHK 063/084 062/083 066/081 055/085 055/081 053/080 052/081
    33/T    64/T    22/B    22/B    22/B    22/B    33/T
SHR 060/084 057/085 055/081 054/086 052/081 051/080 050/082
    33/T    43/T    22/B    22/B    22/B    22/B    33/T

The office that day

Everything else NWS Billings, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 29, 11:03 PM MDT	Severe Thunderstorm Warning	BYZ	Treasure	42 min
Jun 29, 11:16 PM MDT	Severe Thunderstorm Warning	BYZ	Custer, Powder River	44 min
Jun 29, 11:43 PM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	47 min
Jun 29, 11:52 PM MDT	Severe Thunderstorm Warning	BYZ	Carter	53 min
Jun 29, 11:59 PM MDT	Severe Thunderstorm Warning	BYZ	Powder River	61 min
Jun 30, 12:03 AM MDT	Severe Thunderstorm Warning	BYZ	Custer	57 min
Jun 30, 12:23 AM MDT	Severe Thunderstorm Warning	BYZ	Powder River, Rosebud	67 min
Jun 30, 12:41 AM MDT	Tornado Warning	BYZ	Rosebud	34 min
Jun 30, 12:44 AM MDT	Severe Thunderstorm Warning	BYZ	Carter	61 min
Jun 30, 12:57 AM MDT	Flash Flood Warning	BYZ	Rosebud	2 hr
Jun 30, 12:59 AM MDT	Severe Thunderstorm Warning	BYZ	Powder River	61 min
Jun 30, 1:25 AM MDT	Flash Flood Warning	BYZ	Powder River	2 hr
Jun 30, 3:02 AM MDT	Severe Thunderstorm Warning	BYZ	Powder River	58 min

Nearby

Severe Thunderstorm Warnings in Montana, 2001 Every 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.