Alert archive / Montana / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 121, NWS Glasgow, MT

July 10, 2000Wibaux County, Montana

NWS Glasgow, MT issued this severe thunderstorm warning at Jul 10, 2000, 4:43 PM MDT for Wibaux County, Montana. It was in force for 62 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: Jul 10, 2000, 4:43 PM MDT (22:43 UTC)
Expired: Jul 10, 2000, 5:45 PM MDT
In force: 62 min
Issued by: NWS Glasgow, MT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Wibaux County, MT

The radar

The Glasgow radar (KGGW), 225 km from the middle of the area, began a volume at 22:46 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
Jul 10, 4:51 PM MDT	Hail 1.75	Wibaux, MT	Hail was 3-4 inches deep.
Jul 10, 5:06 PM MDT	Hail 1.75	Wibaux, 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 10, 4:00 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 10.7 hours before the alert went out and 225 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: 59 J/kg
Mixed-layer CIN: -339 J/kg
Mixed-layer LCL: 1008 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 133 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

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 10, 2:00 PM MDT, 2 hours 43 minutes earlier.

Area forecast discussion, Jul 10, 2:00 PM MDT, 2 hours 43 minutes before

NORTHEAST MONTANA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
200 PM MDT MON JUL 10 2000

DAY 10 OF THE SW FLOW OVER NEMONT WITH SVR CONVECTION KNOCKING AT
THE DOOR AGAIN THIS AFTERNOON AND EVENING.

THE GOOD NEWS HOWEVER THAT THERE SHOULD BE A BREAK IN THE ACTION FOR
ALL BUT THE EXTREME EASTERN CWFA ON TUESDAY AND MAYBE EVEN
WEDNESDAY.

MODELS IN FAIR AGREEMENT IN THE SHORT WITH THE H5 PATTERN SHIFTING
THE CENTRAL CONUS RIDGE BACK OVER THE REGION BY WEDNESDAY. THIS
WOULD WARM AND DRY OUT THE ATMOSPHERE A TAD OVER THE REGION.

FOR TONIGHT...WITH BRIDGES BEING WASHED OUT OR THREATENED AT TIMES.
AREAS IN THE SOUTHERN CWFA HAVE RECIEVED UP TO 6 INCHES OF RAINFALL
OVER THE PAST WEEK...AND WILL NOT TAKE ANY MORE RAIN. HAVE ISSUED
FFA FOR THE WESTERN CWFA ALREADY...AND WILL ISSUE THE EASTERN CWFA
LATER AS THE STORMS GET CLOSER TO THE REGION.

TUESDAY...ANOTHER SHORTWAVE MOVES UP...THIS TIME IT SHOULD ONLY
EFFECT THE EASTERN CWFA...WILL KEEP IN THE CHC RANGE FOR THE
REGION...WHERE SLGT CHC WEST LOOKS GOOD. WEDNESDAY...WILL GO WITH 20
POPS FOR NOW LATER SHIFTS COULD LOWER THEM WITH NEW MODEL RUNS.

TEMPS...NO ARGUEMENTS WITH THE NEW MAV GUIDANCE.          PROTON

EXTENDED...UPPER LEVEL RIDGE BUILDS ACROSS THE INTERMOUNTAIN WEST ON
THURSDAY AND BEGINS TO SHIFT EAST AGAIN ON FRIDAY. 70H TEMPERATURES
OVER GGW RISE DRAMATICALLY FROM +7 ON WEDNESDAY MORNING...TO +14
FRIDAY AFTERNOON. THIS SHOULD HELP TO CAP THUNDERSTORSM...BUT WITH
RESIDUAL LOW LEVEL MOISTURE AND STRONG SURFACE HEATINNG...WILL LEAVE
MENTION OF THUNDERSTORMS. WILL ALSO PUSH TEMPERATURES UP ACCORDINGLY
ON THURSDAY AND FRIDAY. GULF OF ALASKA LOW TRIES TO PUSH INLAND A
BIT FRIDAY AND INTO SATURDAY...BEING LOCATED OVER SEATTLE SATURDAY
MORNING. THIS PUSHES THE RIDGE AXIS FURTHER EAST INTO THE
DAKOTAS...WITH SOUTHWESTERLY FLOW ALOFT AND LOWER THICKNESS VALUES
OVER CWA AGAIN. THIS PUTS US BACK INTO THE FAVORED PATTERN FOR
THUNDERSTORM DEVELOPMENT.   POHL

GGW TBTTT 060/086 059/091 058/091 061/094 062/088 948222/87333
GDV TTTTT 062/087 059/093 061/094 061/095 062/091 946242/87333

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 6:31 PM MDT	Flash Flood Warning	GGW	McCone	6 hr
Jul 9, 6:40 PM MDT	Severe Thunderstorm Warning	GGW	McCone	65 min
Jul 9, 6:54 PM MDT	Severe Thunderstorm Warning	GGW	Valley	51 min
Jul 10, 3:47 PM MDT	Severe Thunderstorm Warning	GGW	Wibaux	58 min
Jul 10, 4:08 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	67 min
Jul 10, 5:11 PM MDT	Severe Thunderstorm Warning	GGW	Phillips	64 min
Jul 10, 5:46 PM MDT	Tornado Warning	GGW	Valley	59 min

Nearby

Severe Thunderstorm Warnings in Montana, 2000 Every severe thunderstorm warning in 2000

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.