Alert archive / Montana / Flash Flood Warnings in 1998

Flash Flood Warning 9, NWS Glasgow, MT

July 5, 1998Roosevelt County, Montana

NWS Glasgow, MT issued this flash flood warning at Jul 5, 1998, 6:30 PM MDT for Roosevelt County, Montana. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 5, 1998, 6:30 PM MDT (00:30 UTC)
Expired: Jul 5, 1998, 10:40 PM MDT
In force: 4 hr
Issued by: NWS Glasgow, MT
Area: Whole counties

County Roosevelt County, MT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.5 hours before the alert went out and 118 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: 1916 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1552 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -1.0

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 flash flood 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 flash flood warning went out at Jul 5, 2:20 PM MDT, 4 hours 10 minutes earlier.

Area forecast discussion, Jul 5, 2:20 PM MDT, 4 hours 10 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 6:30 PM MDT	Flash Flood Warning	GGW	Roosevelt	4 hr
Jul 5, 6:43 PM MDT	Severe Thunderstorm Warning	GGW	Daniels	47 min
Jul 5, 7:21 PM MDT	Severe Thunderstorm Warning	GGW	Daniels	64 min
Jul 5, 7:26 PM MDT	Flash Flood Warning	GGW	Daniels	4 hr
Jul 5, 7:36 PM MDT	Severe Thunderstorm Warning	GGW	Roosevelt	64 min
Jul 5, 7:38 PM MDT	Severe Thunderstorm Warning	GGW	Sheridan	62 min
Jul 5, 8:15 PM MDT	Severe Thunderstorm Warning	GGW	Valley	65 min
Jul 5, 8:33 PM MDT	Severe Thunderstorm Warning	GGW	Roosevelt	62 min
Jul 5, 9:09 PM MDT	Severe Thunderstorm Warning	GGW	Sheridan	66 min
Jul 5, 9:29 PM MDT	Severe Thunderstorm Warning	GGW	Roosevelt	46 min
Jul 5, 10:23 PM MDT	Flash Flood Warning	GGW	Roosevelt	97 min
Jul 6, 10:58 AM MDT	Severe Thunderstorm Warning	GGW	Valley	62 min
Jul 6, 11:23 AM MDT	Severe Thunderstorm Warning	GGW	McCone	62 min
Jul 6, 1:48 PM MDT	Severe Thunderstorm Warning	GGW	Valley	67 min
Jul 6, 1:56 PM MDT	Severe Thunderstorm Warning	GGW	Richland	64 min
Jul 6, 2:50 PM MDT	Severe Thunderstorm Warning	GGW	Daniels	65 min
Jul 6, 3:22 PM MDT	Severe Thunderstorm Warning	GGW	McCone	63 min
Jul 6, 3:31 PM MDT	Severe Thunderstorm Warning	GGW	Prairie	64 min
Jul 6, 3:35 PM MDT	Severe Thunderstorm Warning	GGW	Valley	65 min
Jul 6, 4:02 PM MDT	Severe Thunderstorm Warning	GGW	Dawson	63 min
Jul 6, 4:10 PM MDT	Severe Thunderstorm Warning	GGW	Richland	65 min
Jul 6, 4:40 PM MDT	Severe Thunderstorm Warning	GGW	Valley	60 min
Jul 6, 4:44 PM MDT	Severe Thunderstorm Warning	GGW	Dawson	61 min
Jul 6, 4:56 PM MDT	Severe Thunderstorm Warning	GGW	Prairie	49 min

Nearby

Flash Flood Warnings in Montana, 1998 Every flash flood warning 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.