Alert archive / Montana / Flash Flood Warnings in 1991

Flash Flood Warning 2, NWS Billings, MT

June 21, 1991Golden Valley County, Musselshell County, Montana

NWS Billings, MT issued this flash flood warning at Jun 21, 1991, 4:11 PM MDT for Golden Valley County, Musselshell County, Montana. It was in force for 64 min.

The area

The counties it named.

The facts

Issued
Jun 21, 1991, 4:11 PM MDT (22:11 UTC)
Expired
Jun 21, 1991, 5:15 PM MDT
In force
64 min
Issued by
NWS Billings, MT
Area
Whole counties

Counties Golden Valley County, MT, Musselshell County, MT

The nearest sounding before it

Great Falls, MT (KGTF), launched 12:00Z, 10.2 hours before the alert went out and 223 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 1991-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1991-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1217 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
59 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 flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jun 21, 1:48 PM MDT, 2 hours 23 minutes before
WYZ003-004-005-212300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHERIDAN WY
150 PM MDT WED JUN 21 1991

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR SHERIDAN AND JONHSON
COUNTIES UNTIL 8 PM MDT THIS EVENING...

AT 130 PM MDT RADAR SHOWED THUNDERSTORMS STARTING TO DEVELOP IN
NORTH CENTRAL WYOMING.  AT THIS TIME NO SEVERE WEATHER HAS BEEN
REPORTED.  THE STRONGEST OF THESE STORMS IS SOUTH OF SHERIDAN ABOUT
25 MILES MOVING NORTHEAST.

,PERSONS IN NORTH CENRAL WYOMING SHOULD KEEP AN EYE ON THE WEATHER
AND IF THREATENING WEATHER IS SIGHT GO TO A SAFE PLACE.

ZEGLIN

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 4:11 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Musselshell64 min
Jun 21, 4:36 PM MDTFlash Flood WarningBYZTreasure, Yellowstone69 min
Jun 21, 4:36 PM MDTSevere Thunderstorm WarningBYZTreasure, Yellowstone69 min
Jun 21, 4:43 PM MDTTornado WarningBYZYellowstone32 min
Jun 21, 5:01 PM MDTTornado WarningBYZBig Horn29 min
Jun 21, 5:37 PM MDTTornado WarningBYZBig Horn38 min
Jun 21, 5:55 PM MDTTornado WarningBYZRosebud65 min

Nearby

Flash Flood Warnings in Montana, 1991Every flash flood warning in 1991

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.