Alert archive / Montana / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 64, NWS Glasgow, MT

July 6, 2002McCone County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 6, 2002, 10:07 PM MDT for McCone County, Montana. It was in force for 53 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 6, 2002, 10:07 PM MDT (04:07 UTC)
Expired
Jul 6, 2002, 11:00 PM MDT
In force
53 min
Issued by
NWS Glasgow, MT
Area
Whole counties

County McCone County, MT

The radar

The Glasgow radar (KGGW), 88 km from the middle of the area, began a volume at 04:08 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

TimeReportWhereRemark
Jul 6, 10:44 PM MDTHail 0.75Brockway, 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 00:00Z, 4.1 hours before the alert went out and 88 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 00:00Z on 2002-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2002-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2853 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
129 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS55 KGGW 070407
SVRGGW
MTC055-070500-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
1007 PM MDT SAT JUL 6 2002

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MCCONE COUNTY IN NORTHEAST MONTANA

* UNTIL 1100 PM MDT

* AT 1003 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 13 MILES SOUTHWEST OF BROCKWAY...OR ABOUT 24
  MILES SOUTHWEST OF CIRCLE...MOVING NORTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BROCKWAY BY 1050 PM MDT

VERY LARGE HAIL IS POSSIBLE WITH THIS STORM. IF YOU ARE IN THE PATH
OF THE STORM...SEEK SHELTER INDOORS.

.END

79

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 6, 2:15 PM MDT, 7 hours 52 minutes earlier.

Area forecast discussion, Jul 6, 2:15 PM MDT, 7 hours 52 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
215 PM MDT SAT JUL 6 2002

.SHORT TERM...BAND OF CONVECTION ACROSS SOUTHEAST ZONES ASSOCIATED
WITH THETA E AND CAPE GRADIENT WORKING ITS WAY INTO THE CWA FROM THE
SOUTH.  ANTICIPATE SOME SHOWER AND THUNDERSTORM DEVELOPMENT TONIGHT
AS THE GRADIENT ROTATES FURTHER INTO THE CWA.  TEMPERATURES ARE DOWN
TODAY BECAUSE EVAPORATION OF MOISTURE FROM RAINFALL THIS MORNING IS
USING AVAILABLE SOLAR ENERGY.  OTHERWISE TEMPS WOULD BE 90+ MOST
AREAS.

NEXT SYSTEM BEGINS ITS APPROACH SUNDAY EVENING AS THE WARM SECTOR
MOVES IN.  RUC METEOGRAMS SHOWING AN INCREASE IN INSTABILITY.  COLD
FRONT ARRIVES MONDAY AFTERNOON PRECEDED BY STRONG WINDS AHEAD OF IT.
EXPECT THUNDERSTORMS TO SPREAD ACROSS THE REGION MONDAY AFTERNOON OR
EVENING AND POSSIBLY LINGER OVERNIGHT IN THE EASTERN ZONES.  TUESDAY
WILL BE COOLER THAN EITHER SUNDAY OR MONDAY AS THE COOLER AIR MASS
SETTLES IN AND CLEARING TAKES PLACE.

.LONG TERM...SEVERAL WEAK SHORTWAVES ROTATING ACROSS THE TOP OF A
DIRTY UPPER RIDGE THROUGH THE EXTENDED PERIOD.  A SURFACE HIGH
PUSHES INTO THE CWA FROM ALBERTA BRINGING SLIGHTLY LOWER HEIGHTS AND
POSSIBLY COOLER TEMPERATURES LATE SATURDAY.  FLOW AROUND THE HIGH
WILL PUMP MOISTURE INTO THE REGION AGAIN...POSSIBLY FUELING ANOTHER
ROUND OF THUNDER OVER THE WEEKEND.  MCNULTY

KGGW BBB 061/091 060/092 057/083 81524362
     BBBB 059/087 061/088 060/086 059/090 8111111111

KGDV BBB 063/093 061/093 063/084 81533263
     BBBB 059/089 060/087 063/089 060/089 8111111111

.GGW...NONE.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 8:56 PM MDTSevere Thunderstorm WarningGGWPrairie64 min

Nearby

Severe Thunderstorm Warnings in Montana, 2002Every severe thunderstorm warning in 2002

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.