Alert archive / Montana / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 38, NWS Glasgow, MT

June 29, 2002Daniels County, Valley County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jun 29, 2002, 4:15 PM MDT for Daniels County, Valley County, Montana. It was in force for 60 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: Jun 29, 2002, 4:15 PM MDT (22:15 UTC)
Expired: Jun 29, 2002, 5:15 PM MDT
In force: 60 min
Issued by: NWS Glasgow, MT
Area: Whole counties

Counties Daniels County, MT, Valley County, MT

The radar

The Glasgow radar (KGGW), 56 km from the middle of the area, began a volume at 22:16 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 29, 4:20 PM MDT	Thunderstorm Wind 52 M	Opheim, MT	60 mph wind gust reported 5 miles south of Opheim.
Jun 29, 4:30 PM MDT	Hail 1	Opheim, MT
Jun 29, 4:34 PM MDT	Thunderstorm Wind 50 M	Peerless, MT	58 mph wind gust reported 12 miles southsouthwest of Peerless.

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, 2:00 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 10.3 hours before the alert went out and 54 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: 80 J/kg
Mixed-layer CIN: -468 J/kg
Mixed-layer LCL: 2641 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Jun 29, 2:33 PM MDT, 1 hour 42 minutes earlier.

Area forecast discussion, Jun 29, 2:33 PM MDT, 1 hour 42 minutes before

NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
230 PM MDT SAT JUN 29 2002

.SHORT TERM...A 120 KT JET PUNCHING INTO WESTERN MONTANA THIS
AFTERNOON WILL DRIVE A COLD FRONT INTO EASTERN MONTANA THIS EVENING.
AIR MASS AHEAD OF THIS FEATURE IS MODERATELY UNSTABLE. STRONG/SEVERE
THUNDERSTORMS OVER CENTRAL MONTANA WILL SPREAD EAST AHEAD OF THE
FRONT THIS AFTERNOON/TONIGHT. MAIN THREAT SHOULD BE DAMAGING WINDS
AHEAD OF THE FRONT WITH ISOLATED AREAS OF LARGE HAIL ALSO POSSIBLE.
THE AIR MASS DRIES OUT QUICKLY BEHIND THE FRONT TONIGHT WITH DRY AND
COOLER CONDITIONS IN STORE FOR SUNDAY. THE ETA BRINGS ANOTHER WAVE
ALONG THE CANADIAN BORDER SUNDAY NIGHT WITH WEAK LOW PRESSURE
DEVELOPING OVER SOUTHEAST MONTANA. WILL ADD 20 POPS TO COVER
THIS...OTHERWISE DRY CONDITIONS WILL PREVAIL THROUGH TUESDAY.

.LONG TERM...AN UPPER LEVEL RIDGE MOVES OVER THE AREA WEDNESDAY TO
CONTINUE DRY CONDITIONS. SOUTHWEST FLOW RETURNS THE FOURTH OF JULY
FOR CHANCE POPS DAYS 5-7. TEMPERATURES WILL WARM WEDNESDAY AND THE
FOURTH...THEN COOL OFF FRIDAY AND SATURDAY AS A COLD FRONT MOVES
THROUGH THE AREA LATE THURSDAY.  WATERHOUSE

KGGW BBB 058/082 055/080 053/080 99612000
     BTTT 056/083 059/086 060/081 054/081 9912333333
KGDV BBB 061/085 057/083 054/083 99612000
     BTTT 057/085 060/087 060/083 054/083 9912333333

.GGW...NONE

In the hours before

Local storm report, Jun 29, 3:13 PM MDT, 1 hour 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
313 PM MDT SAT JUN 29 2002

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1140 PM    15 S CONTENT              MT   60 MPH TSTM WIND GUST
06/28/02   PHILLIPS

1140 PM    15 S CONTENT              MT   WIND DAMAGE
06/28/02   PHILLIPS                       ROOF BLOWN OFF BARN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 11:13 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	62 min
Jun 28, 11:54 PM MDT	Severe Thunderstorm Warning	GGW	Valley	51 min
Jun 29, 3:13 PM MDT	Severe Thunderstorm Warning	GGW	Phillips, Valley	62 min
Jun 29, 3:50 PM MDT	Severe Thunderstorm Warning	GGW	McCone	55 min
Jun 29, 4:04 PM MDT	Severe Thunderstorm Warning	GGW	McCone	41 min
Jun 29, 4:07 PM MDT	Severe Thunderstorm Warning	GGW	Roosevelt	53 min
Jun 29, 4:43 PM MDT	Severe Thunderstorm Warning	GGW	Prairie	62 min
Jun 29, 4:49 PM MDT	Severe Thunderstorm Warning	GGW	McCone	56 min
Jun 29, 4:53 PM MDT	Severe Thunderstorm Warning	GGW	Dawson, Richland	67 min
Jun 29, 5:02 PM MDT	Severe Thunderstorm Warning	GGW	Roosevelt	58 min
Jun 29, 5:54 PM MDT	Severe Thunderstorm Warning	GGW	Daniels	66 min
Jun 29, 5:56 PM MDT	Severe Thunderstorm Warning	GGW	Richland, Wibaux	64 min

Nearby

Severe Thunderstorm Warnings in Montana, 2002 Every 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.