Alert archive / Montana / Flash Flood Warnings in 2002
Flash Flood Warning 11, NWS Glasgow, MT
NWS Glasgow, MT issued this flash flood warning at Aug 21, 2002, 2:44 AM 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
- Aug 21, 2002, 2:44 AM MDT (08:44 UTC)
- Expired
- Aug 21, 2002, 8:45 AM MDT
- In force
- 6 hr
- Issued by
- NWS Glasgow, MT
- Area
- Whole counties
County McCone County, MT
The radar
The Glasgow radar (KGGW), 88 km from the middle of the area, began a volume at 08:43 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 8.7 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.
- Mixed-layer CAPE
- 41 J/kg
- Mixed-layer CIN
- -403 J/kg
- Mixed-layer LCL
- 2487 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 182 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS55 KGGW 210844 FFWGGW MTC055-211445- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE GLASGOW MT 241 AM MDT WED AUG 21 2002 THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHWESTERN MCCONE COUNTY IN NORTHEAST MONTANA * UNTIL 845 AM MDT * AT 240 AM MDT...RADAR INDICTAED THUNDERSTORMS WITH VERY HEAVY RAINFALL IN EXTREME NORTHWESTERN MCCONE COUNTY...OR ABOUT 5 MILES SOUTHEAST OF FORT PECK...MOVING EAST AT 10 MPH. * SLOW MOVING THUNDERSTORMS ARE PRODUCING TORRENTIAL RAINFALL IN THE WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE THE SPILLWAY OF FORT PECK DAM ON HIGHWAY 24 AND...RURAL NORTHWESTERN MCCONE COUNTY BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. .END 79
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 Aug 21, 2:30 AM MDT, 14 minutes earlier.
Area forecast discussion, Aug 21, 2:30 AM MDT, 14 minutes before
NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
230 AM MDT WED AUG 21 2002
.SHORT TERM...
UPPER LOW HAS CONSIDERABLY SLOWED DOWN...NOW OVER E OREGON...
PUTTING E MT IN A TREMENDOUS UPPER DIVERGENT PATTERN THIS MORNING. AS A
RESULT...SEVERE THUNDERSTORMS WITH HEAVY RAIN HAVE BROKEN OUT. THESE
STORMS HAVE BEEN NEARLY STATIONARY SINCE ABOUT MIDNIGHT...AND
FORTUNATELY OVER A VERY DESOLATE PORTION OF THE CWA. AN AREA ABOUT 20
MILES SOUTH OF GLASGOW...ACCORDING TO RADAR ESTIMATES HAS PICKED UP 11
INCHES OF RAIN.
THE BIGGEST QUESTION IS WHAT HAPPENS IN THE NEXT SEVERAL HOURS. DO THE
CURRENT STORMS LIFT OUT...OR DO THEY CONTINUE IN SCATTERED FASHION OVER
THE CWA?
OVER THE REMAINDER OF THE SHORT-TERM BOTH THE ETA AND AVN ARE IN
AGREEMENT WITH THE GENERAL UPPER PATTERN. THE UPPER LOW IS EXPECTED TO
WOBBLE INTO IDAHO TODAY...THEN WEAKEN AND DRIFT WEST BY THURSDAY.
THETA-E RIDGE IS EXPECTED TO GRADUALLY SHARPEN THROUGH FRIDAY WHILE
THE UPPER LEVEL FLOW IS EXPECTED TO REMAIN FROM THE SW. THEREFORE...
HAVE ADDED MENTION OF THUNDERSTORMS FOR THURSDAY AND FRIDAY ACROSS THE
CWA.
.LONG TERM...
MRF AND ECMWF IN AGREEMENT WITH UPPER LOW THAT IS NEARLY STATIONARY OVER
THE PACIFIC NW FINALLY PULLS OUT EARLY NEXT WEEK. CONFIDENCE IS LOW
THAT SATURDAY WILL REMAIN DRY WHILE A CHANCE OF THUNDERSTORMS FROM
SUNDAY THROUGH TUESDAY LOOKS GOOD AT THE MOMENT.
KGGW TBB /075 055/082 058/081 7643222
BBBB 051/081 050/084 051/081 052/083 052/ 76223333333
KGDV TBB /082 058/084 058/084 7643222
BBBB 052/082 050/083 050/082 051/084 051/ 76223333333
.GGW...NONE.The office that day
Everything else NWS Glasgow, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 11:23 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 52 min |
| Aug 21, 12:18 AM MDT | Severe Thunderstorm Warning | GGW | Valley | 57 min |
| Aug 21, 12:35 AM MDT | Flash Flood Warning | GGW | Valley | 6 hr |
| Aug 21, 1:19 AM MDT | Severe Thunderstorm Warning | GGW | Valley | 56 min |
| Aug 21, 2:19 AM MDT | Severe Thunderstorm Warning | GGW | McCone, Valley | 56 min |
| Aug 21, 4:53 AM MDT | Severe Thunderstorm Warning | GGW | McCone | 67 min |
| Aug 21, 10:20 AM MDT | Flash Flood Warning | GGW | Valley | 6 hr |
Nearby
Flash Flood Warnings in Montana, 2002Every flash flood warning in 2002
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; radar from the NEXRAD Level II archive.