Alert archive / Montana / Flash Flood Warnings in 2001

Flash Flood Warning 7, NWS Billings, MT

July 2, 2001Musselshell County, Montana

NWS Billings, MT issued this flash flood warning at Jul 2, 2001, 12:25 AM MDT for Musselshell County, Montana. It was in force for 3 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 2, 2001, 12:25 AM MDT (06:25 UTC)
Expired: Jul 2, 2001, 3:30 AM MDT
In force: 3 hr
Issued by: NWS Billings, MT
Area: Whole counties

County Musselshell County, MT

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 6.4 hours before the alert went out and 198 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: 490 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 2854 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS55 KBYZ 020625
FFWBIL
FFWBIL
MTC065-020930-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BILLINGS MT
1225 AM MDT MON JUL 2 2001

THE NATIONAL WEATHER SERVICE IN BILLINGS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHERN MUSSELSHELL COUNTY IN CENTRAL MONTANA

* UNTIL 330 AM MDT

* AT 1223 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR            
  INDICATED THUNDERSTORMS WITH VERY HEAVY RAIN OVER NORTHERN
  MUSSELSHELL COUNTY.

* THUNDERSTORMS WERE CONTINUOUSLY REDEVELOPING OVER THE WARNED AREA...
  RESULTING IN EXCESSIVE RAINFALL. BILLINGS DOPPLER RADAR INDICATES
  RAINFALL RATES OF 3 TO 4 INCHES AN HOUR 10 MILES NORTH OF ROUNDUP.

SMALL CREEKS AND STREAMS WILL RAPIDLY FLOOD IN THE WARNED 
AREA...POSSIBLY WASHING OUT ROADS AND FLOODING NEARBLY LOW AREAS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS.

THIS WARNING REPLACES THE PREVIOUS FLASH FLOOD WARNING FOR NORTHERN 
MUSSELSHELL COUNTY.

$$

LAT...LON 4675 10890 4642 10885 4643 10784 4675 10785

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 Billings, MT wrote its last area forecast discussion before this flash flood warning went out at Jul 1, 8:50 PM MDT, 3 hours 35 minutes earlier.

Area forecast discussion, Jul 1, 8:50 PM MDT, 3 hours 35 minutes before

SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
850 PM MDT SUN JUL 1 2001

.MON AND TUE...
SEVERE THUNDERSTORM WATCH GOING UNTIL MIDNIGHT. SHORTWAVE TRACKING INTO
THE AREA NOW WITH ANOTHER WAVE BEHIND IT IN IDAHO. STORMS HAVE RISEN
AND THEN FALLEN THE LAST COUPLE OF HOURS. CAP A LITTLE TOO STRONG AT THE
MOMENT. AS STORMS CONTINUE TO FIRE OVER THE MOUNTAINS...THIS SHOULD AID
IN CAP EROSION AND ALLOW FOR AN EASTWARD PROGRESSION. DEWPOINTS IN THE
60S ALMOST EVERYWHERE WITH MID 60S AT BILLINGS. SHEAR STILL SUPPORTS
SUPERCELLS. FRONTAL BOUNDARY LAYING OVER SOUTHERN MONTANA TO INTERACT
WITH. LIKE THE IDEA OF THE WATCH AND FEEL THINGS WILL CONTINUE TO
DEVELOP THIS EVENING...THEN SHIFT EAST OVERNIGHT. NEXT UPSTREAM WAVE
COULD MAKE FOR ANOTHER LONG NIGHT. INSTABILITY TAPERS OFF OVER THE
EXTREME EAST...SO STORMS SHOULD DECREASE OVER THE LAST TWO EASTERN
COUNTIES. CURRENT FORECAST LOOKS GOOD. HUMPHREY

.WED...THU...FRI...SAT...SUN...
RIDGE WILL BE OVER THE AREA WEDNESDAY AND THURSDAY...BUT 00Z AND 12Z
AVN/MRF INDICATE A SHORT WAVE WILL BRIEFLY KNOCK THE RIDGE DOWN
ON FRIDAY.  WILL THEREFORE INTRODUCE CHANCE POPS TO CENTRAL AND
EASTERN ZONES WHERE GREATEST INSTABILITY WILL EXIST.  RIDGE SHOULD
RETURN FOR SATURDAY AND SUNDAY.  WITH THE RIDGE OVERHEAD...TEMPS WILL
BE A FEW DEGREES ABOVE NORMAL.  MOORE

    MON     TUE     WED     THU     FRI     SAT     SUN
-----------------------------------------------------------
BIL 061/092 060/091 057/088 057/090 054/087 059/087 056/089
    42/T    20/B    01/B    20/B    33/T    11/B    11/B
LVM 057/090 058/091 053/088 052/087 050/087 055/087 056/088
    40/B    00/B    01/B    20/B    22/B    11/B    11/B
HDN 059/094 058/093 055/090 053/088 051/088 063/090 062/090
    42/T    20/B    01/B    20/B    33/T    11/B    11/B
MLS 058/090 058/090 059/087 055/086 054/085 059/085 059/086
    33/T    20/B    01/B    00/B    33/T    11/B    11/B
4BQ 057/089 057/090 057/086 054/084 053/084 058/088 058/089
    33/T    20/B    01/B    00/B    33/T    11/B    11/B
BHK 056/087 056/088 055/085 053/085 052/083 054/083 054/085
    33/T    20/B    01/B    00/B    33/T    11/B    11/B
SHR 057/091 056/091 052/088 051/086 050/086 051/086 052/086
    22/T    22/T    01/B    00/B    33/T    11/B    11/B

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 9:07 PM MDT	Severe Thunderstorm Warning	BYZ	Stillwater, Sweet Grass	53 min
Jul 1, 9:18 PM MDT	Severe Thunderstorm Warning	BYZ	Musselshell	57 min
Jul 1, 9:26 PM MDT	Severe Thunderstorm Warning	BYZ	Golden Valley	49 min
Jul 1, 9:37 PM MDT	Flash Flood Warning	BYZ	Musselshell	15 hr
Jul 1, 10:15 PM MDT	Severe Thunderstorm Warning	BYZ	Musselshell	60 min
Jul 2, 12:00 AM MDT	Severe Thunderstorm Warning	BYZ	Musselshell	60 min
Jul 2, 12:16 AM MDT	Severe Thunderstorm Warning	BYZ	Golden Valley	59 min
Jul 2, 1:14 AM MDT	Severe Thunderstorm Warning	BYZ	Golden Valley, Musselshell	61 min
Jul 2, 2:14 AM MDT	Severe Thunderstorm Warning	BYZ	Musselshell	61 min
Jul 2, 5:20 AM MDT	Severe Thunderstorm Warning	BYZ	Treasure	40 min
Jul 2, 5:36 AM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	54 min
Jul 2, 6:31 AM MDT	Severe Thunderstorm Warning	BYZ	Musselshell	59 min
Jul 2, 7:01 AM MDT	Severe Thunderstorm Warning	BYZ	Rosebud, Treasure	59 min
Jul 2, 7:11 AM MDT	Severe Thunderstorm Warning	BYZ	Yellowstone	49 min
Jul 2, 7:51 AM MDT	Severe Thunderstorm Warning	BYZ	Treasure	39 min
Jul 2, 8:12 AM MDT	Severe Thunderstorm Warning	BYZ	Rosebud	63 min
Jul 2, 8:52 AM MDT	Severe Thunderstorm Warning	BYZ	Treasure	23 min

Nearby

Flash Flood Warnings in Montana, 2001 Every 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.