Alert archive / Montana / Severe Thunderstorm Watches in 1998

Severe Thunderstorm Watch 736

July 10, 199818 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jul 10, 1998, 4:30 PM MDT for 18 counties in Montana. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 10, 1998, 4:30 PM MDT (22:30 UTC)
Expired
Jul 10, 1998, 10:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Beaverhead County, MT, Broadwater County, MT, Deer Lodge County, MT, Flathead County, MT, Gallatin County, MT, Glacier County, MT, Granite County, MT, Jefferson County, MT, Lake County, MT, Lewis and Clark County, MT, Lincoln County, MT, Madison County, MT, Mineral County, MT, Missoula County, MT, Powell County, MT, Ravalli County, MT, Sanders County, MT, Silver Bow County, MT

The radar

The Missoula radar (KMSX), 59 km from the middle of the area, began a volume at 22:31 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.

Warnings issued inside it

5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 10, 5:16 PM MDTSevere Thunderstorm WarningMSOMissoula64 min
Jul 10, 5:49 PM MDTSevere Thunderstorm WarningMSOGranite, Missoula31 min
Jul 10, 6:02 PM MDTSevere Thunderstorm WarningMSOLake, Missoula, Sanders33 min
Jul 10, 6:16 PM MDTSevere Thunderstorm WarningMSOGranite, Missoula34 min
Jul 10, 6:54 PM MDTSevere Thunderstorm WarningMSOLake, Missoula61 min

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 10.5 hours before the alert went out and 202 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, Great_falls, MT at 12:00Z on 1998-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 147 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, Great_falls, MT at 12:00Z on 1998-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 7 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
147 J/kg
Mixed-layer CIN
-223 J/kg
Mixed-layer LCL
2441 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
7 m²/s²
0-3 km storm-relative helicity
22 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.

Nearby

Severe Thunderstorm Watches in Montana, 1998Every severe thunderstorm watch in 1998

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.