Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 103, NWS Billings, MT

July 1, 2001Custer County, Montana

NWS Billings, MT issued this severe thunderstorm warning at Jul 1, 2001, 6:27 AM MDT for Custer County, Montana. It was in force for 63 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: Jul 1, 2001, 6:27 AM MDT (12:27 UTC)
Expired: Jul 1, 2001, 7:30 AM MDT
In force: 63 min
Issued by: NWS Billings, MT
Area: Whole counties

County Custer County, MT

What was reported inside it

Time	Report	Where
Jul 1, 7:05 AM MDT	Hail 1	Mizpah, MT
Jul 1, 7:10 AM MDT	Hail 2	Mizpah, MT
Jul 1, 7:17 AM MDT	Hail 1	Mizpah, 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

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 0.5 hours before the alert went out and 232 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 925 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 202 m²/s²
0-3 km storm-relative helicity: 302 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

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 Jul 1, 2:13 AM MDT, 4 hours 14 minutes earlier.

Area forecast discussion, Jul 1, 2:13 AM MDT, 4 hours 14 minutes before

SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
213 AM MDT SUN JUL 1 2001

.TDY AND MON...
WARM FRONT TRYING TO LIFT NORTH INTO SOUTHERN MONTANA...BUT LOW LEVEL
COOL STABLE LAYER HOLDING STRONG. WEAK SHORTWAVE TRACKING ACROSS FRONT
PRODUCING A FEW SHOWERS AND THUNDERSTORMS...BUT NOT NEAR AS STRONG AS
LAST FEW NIGHTS. AIRMASS UNSTABLE CLOSER TO BOUNDARY ACROSS NORTHERN
WYOMING...WHERE STRONGER WYOMING STORMS MAY MOVE INTO FAR SOUTHEAST
MONTANA BEFORE 12Z.

FOR TODAY SHORTWAVE RIDGE FOLLOWS WEAK WAVE EXPECTED TO EXIT ZONES THIS
MORNING. AIRMASS UNSTABLE BUT MOSTLY CAPPED ACROSS AREA. ANY CONVECTION
THIS MORNING WILL BE ELEVATED...TYPICAL OF WARM FRONTAL CONVECTION.
AIRMASS REMAINS CAPPED OUT MOST OF DAY AND EVENING. ETA BRINGS WEAK
SHORTWAVE INTO WESTERN ZONES AT 00Z TONIGHT...AND SLOWLY TRACKS IT
ACROSS ZONES OVERNIGHT. SFC TROUGH ALSO SHIFTS INTO CENTRAL MONTANA. ETA
BUFR SOUNDINGS SHOWING CAPE OF OVER 2500 J/KG AT BILLINGS TONIGHT...BUT
CAPPED. CAP EVEN STRONGER IN THE EAST. IF ANYTHING GETS GOING TONIGHT...
IT WILL PROBABLY BE SEVERE. WILL TAKE CONSERVATIVE APPROACH WITH LOW
SCATTERED POPS FOR NOW...SPLY WITH NO STRONG FORCING.

UPPER RIDGE CONTINUES TO BUILD INTO AREA MONDAY...AND AIRMASS BECOMES
MUCH MORE DRY AND STABLE AS WEAK FRONT PUSHES THROUGH MONDAY MORNING.
DEWPOINTS WILL BE MUCH LOWER MOST OF FORECAST AREA...WITH MOSTLY SUNNY
SKIES. WARMER TEMPS WILL BE REALIZED ALSO WITH DRY ADIABATIC LAPSE
RATES. SCARLETT

.TUE...WED...THU...FRI...SAT...
NO CHANGES TO GOING FORECAST. PATTERN BECOMING DRY AFTER THIS PAST
STORMY WEEK WITH A RIDGE OVER THE STATE. RIDGE BREAKS DOWN TOWARDS
THURSDAY AND ISOLATED POPS LOOK GOOD. BORSUM

    TDY MON     TUE     WED     THU     FRI     SAT
-------------------------------------------------------
BIL 083 061/089 056/089 057/087 057/087 054/087 059/087
    2/T 30/U    00/B    01/B    20/B    22/B    11/B
LVM 088 058/091 052/087 053/087 052/087 050/087 055/087
    2/T 30/U    00/B    01/B    20/B    22/B    11/B
HDN 083 059/091 054/091 055/089 053/088 051/088 063/090
    2/T 30/U    00/B    01/B    20/B    22/B    11/B
MLS 079 059/091 060/088 059/085 055/085 054/085 059/085
    2/T 30/B    00/B    01/B    00/B    22/B    11/B
4BQ 080 060/090 058/087 057/084 054/084 053/084 058/088
    2/T 30/B    00/B    01/B    00/B    22/B    11/B
BHK 075 058/088 055/086 055/0(83 053/083 052/083 054/083
    2/T 30/B    00/B    01/B    00/B    22/B    11/B
SHR 089 060/090 054/090 052/088 051/086 050/086 051/086
    2/T 20/B    00/B    01/B    00/B    22/B    11/B

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 4:45 AM MDT	Severe Thunderstorm Warning	BYZ	Carter	45 min
Jul 1, 5:37 AM MDT	Severe Thunderstorm Warning	BYZ	Custer	53 min
Jul 1, 7:20 AM MDT	Severe Thunderstorm Warning	BYZ	Carter	55 min
Jul 1, 8:15 AM MDT	Severe Thunderstorm Warning	BYZ	Carter	60 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.