Alert archive / Montana / Flash Flood Warnings in 2001

Flash Flood Warning 23, NWS Glasgow, MT

July 21, 2001McCone County, Montana

NWS Glasgow, MT issued this flash flood warning at Jul 21, 2001, 9:28 PM MDT for McCone County, Montana. It was in force for 6 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 21, 2001, 9:28 PM MDT (03:28 UTC)
Expired
Jul 22, 2001, 3:30 AM MDT
In force
6 hr
Issued by
NWS Glasgow, MT
Area
Whole counties; the outline is the Mesonet’s reconstruction

County McCone County, MT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 3.5 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 2001-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 649 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, Glasgow Intl Airport, MT at 00:00Z on 2001-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.19395878Sfc1 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
649 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
2545 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
100 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

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 21, 9:20 PM MDT, 8 minutes earlier.

Area forecast discussion, Jul 21, 9:20 PM MDT, 8 minutes before
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In the hours before

Special weather statement, Jul 21, 9:04 PM MDT, 24 minutes before
MTZ016-017-059>061-220335-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GLASGOW MT
904 PM MDT SAT JUL 21 2001

THE NATIONAL WEATHER SERVICE HAS CLEARED THE FOLLOWING AREAS
REMAINING IN TORNADO WATCH.

IN NORTHEAST MONTANA:

PHILLIPS AND VALLEY COUNTIES.

THIS INCLUDES THE CITIES OF GLASGOW...MALTA...OPHEIM...WHITEWATER...
AND ZORTMAN.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 6:22 PM MDTSevere Thunderstorm WarningGGWPetroleum68 min
Jul 21, 6:29 PM MDTSevere Thunderstorm WarningGGWPhillips61 min
Jul 21, 6:53 PM MDTSevere Thunderstorm WarningGGWValley67 min
Jul 21, 7:06 PM MDTSevere Thunderstorm WarningGGWGarfield69 min
Jul 21, 8:13 PM MDTSevere Thunderstorm WarningGGWGarfield62 min
Jul 21, 8:53 PM MDTSevere Thunderstorm WarningGGWMcCone67 min
Jul 21, 8:55 PM MDTSevere Thunderstorm WarningGGWRoosevelt65 min
Jul 21, 9:00 PM MDTSevere Thunderstorm WarningGGWPetroleum60 min
Jul 21, 9:13 PM MDTFlash Flood WarningGGWGarfield6 hr
Jul 21, 9:17 PM MDTSevere Thunderstorm WarningGGWGarfield58 min
Jul 21, 9:47 PM MDTSevere Thunderstorm WarningGGWPrairie58 min
Jul 21, 9:54 PM MDTSevere Thunderstorm WarningGGWRichland66 min
Jul 21, 9:57 PM MDTSevere Thunderstorm WarningGGWMcCone63 min
Jul 21, 10:00 PM MDTSevere Thunderstorm WarningGGWRoosevelt60 min
Jul 21, 10:07 PM MDTSevere Thunderstorm WarningGGWDawson68 min
Jul 21, 10:32 PM MDTFlash Flood WarningGGWRoosevelt6 hr
Jul 21, 10:50 PM MDTSevere Thunderstorm WarningGGWGarfield55 min
Jul 21, 10:53 PM MDTFlash Flood WarningGGWDawson, Richland6 hr
Jul 21, 11:00 PM MDTSevere Thunderstorm WarningGGWRichland, Roosevelt60 min
Jul 21, 11:14 PM MDTSevere Thunderstorm WarningGGWDawson61 min
Jul 21, 11:22 PM MDTSevere Thunderstorm WarningGGWWibaux53 min
Jul 22, 2:35 AM MDTFlash Flood WarningGGWPrairie6 hr
Jul 22, 5:58 PM MDTSevere Thunderstorm WarningGGWSheridan32 min

Nearby

Flash Flood Warnings in Montana, 2001Every flash flood warning in 2001

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.