Alert archive / Montana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 162, NWS Glasgow, MT

July 26, 2001Garfield County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 26, 2001, 10:30 AM MDT for Garfield County, Montana. It was in force for 60 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 26, 2001, 10:30 AM MDT (16:30 UTC)
Expired
Jul 26, 2001, 11:30 AM MDT
In force
60 min
Issued by
NWS Glasgow, MT
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Garfield County, MT

What was reported inside it

TimeReportWhereRemark
Jul 26, 10:30 AM MDTHail 0.75Sand Spgs, 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, 4.5 hours before the alert went out and 109 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-pSkew-T log-p diagram, Glasgow Intl Airport, MT at 12:00Z on 2001-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 59 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Glasgow Intl Airport, MT at 12:00Z on 2001-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -38 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
59 J/kg
Mixed-layer CIN
-213 J/kg
Mixed-layer LCL
1424 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
-38 m²/s²
0-3 km storm-relative helicity
49 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

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 Glasgow, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 26, 9:00 AM MDT, 1 hour 30 minutes earlier.

Area forecast discussion, Jul 26, 9:00 AM MDT, 1 hour 30 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
900 AM MDT THU JUL 26 2001

STRONG THUNDERSTORM COMPLEX IN OUR SW ZONES HAS BEEN SEVERE THIS
MORNING WITH 1 INCH DIAMETER HAIL 15 MILES S OF GRASSRANGE.

THE INDUCING UPPER FEATURE WILL BE THE MAIN FOCUS FOR THE CWA TODAY...
AND IS SEEN NICELY ON THE MESO-ETA. THE ATMOS IS PRIMED OVER THE CWA
TODAY WITH CAPES ALREADY OVER 1000 J/KG AND LI/S NEAR -5 IN MY SE
ZONES. ZONES ALREADY MENTION POSSIBILITY OF SEVERE STORMS OVER THIS
AREA FOR TODAY...SO WILL LEAVE ALONE. REST OF FORECAST LOOKS GOOD.
JAMBA

EXTENDED...MODELS IN GOOD AGREEMENT THROUGH THE PERIOD. UPPER LEVEL
TROUGH DIGS IN OVER THE PACIFIC NORTHWEST PLACING THE REGION IN
SOUTHWEST FLOW ALOFT SATURDAY. SHOULD POSSIBLY SEE SOME SEVERE
CONVECTION AS SURFACE FRONT COLLIDES WITH DEWPOINTS IN THE 60S LATE
SATURDAY NIGHT. AVN SHOWING BEST OMEGA FOR OUR CWA ALONG THE
CANADIAN BORDER. SUNDAY...WILL SEE SLIGHTLY COOLER TEMPS AS TROUGH
SLIDES NORTHEAST...THEN GRADUAL WARMING TREND THROUGH THE PERIOD.
SOUTHWEST FLOW ALOFT CONTINUES AS TROUGH BECOMES ELONGATED WITH THE
DEVELOPMENT OF A CUTOFF LOW OFF THE COAST OF OREGON...SO WILL KEEP
CHANCE OF TS THROUGH THE REST OF THE FORECAST PERIOD. GILCHRIST/EBERT

KGGW /084 057/087 063/089 056/081 055/082 054/082 056/083
      BBTTTTT  90332/9763333
KGDV /083 062/086 063/088 057/080 055/082 054/082 056/081
      TBTTTTT  90442/9763333

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 6:08 PM MDTSevere Thunderstorm WarningGGWPrairie67 min
Jul 25, 6:46 PM MDTSevere Thunderstorm WarningGGWWibaux59 min
Jul 26, 10:13 AM MDTSevere Thunderstorm WarningGGWPhillips62 min
Jul 26, 11:13 AM MDTSevere Thunderstorm WarningGGWValley62 min
Jul 26, 12:39 PM MDTFlash Flood WarningGGWGarfield6 hr
Jul 26, 2:12 PM MDTSevere Thunderstorm WarningGGWGarfield63 min
Jul 26, 3:15 PM MDTSevere Thunderstorm WarningGGWGarfield60 min
Jul 26, 4:15 PM MDTSevere Thunderstorm WarningGGWGarfield60 min
Jul 26, 5:55 PM MDTSevere Thunderstorm WarningGGWWibaux65 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.