Alert archive / Montana / Flash Flood Warnings in 1990

Flash Flood Warning 1, NWS Billings, MT

July 10, 1990Big Horn County, Yellowstone County, Montana

NWS Billings, MT issued this flash flood warning at Jul 10, 1990, 1:01 PM MDT for Big Horn County, Yellowstone County, Montana. It was in force for 59 min.

The area

The counties it named.

The facts

Issued
Jul 10, 1990, 1:01 PM MDT (19:01 UTC)
Expired
Jul 10, 1990, 2:00 PM MDT
In force
59 min
Issued by
NWS Billings, MT
Area
Whole counties

Counties Big Horn County, MT, Yellowstone County, MT

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 7.0 hours before the alert went out and 287 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 1990-07-10Temperature 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 1990-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -44 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3599 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
-44 m²/s²
0-3 km storm-relative helicity
-1 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, Jul 10, 11:31 AM MDT, 1 hour 30 minutes before
MTZ005-006-007-008-009-WYZ001-002-003-004-005-006-101726-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BILLINGS MT
 1126 AM MDT TUE JULY 10 1990

 AT 1117 AM MDT BILLINGS WEATHER RADAR INDICATED A VERY LARGE AND
STRONG THUNDERSTORM...THE CENTER OF WHICH WAS ABOUT 15 MILES
NORTHWEST OF ROUNDUP. THE STORM WAS MOVING TOWARD THE EAST-SOUTHEAST
AT AROUND 15 MPH. MAXIMUM TOP OF THE CELL WAS ABOUT 45 THOUSAND FEET.
HEAVY RAIN...STRONG GUSTY WINDS AND HAIL MAY ACCOMPANY THE STORM.
GEORGE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 10, 12:03 PM MDTSevere Thunderstorm WarningBYZMusselshell57 min
Jul 10, 1:01 PM MDTSevere Thunderstorm WarningBYZBig Horn, Yellowstone59 min
Jul 10, 1:57 PM MDTSevere Thunderstorm WarningBYZBig Horn, Yellowstone63 min
Jul 10, 2:57 PM MDTSevere Thunderstorm WarningBYZBig Horn63 min

Nearby

Flash Flood Warnings in Montana, 1990Every flash flood warning in 1990

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.