Alert archive / Montana / Flash Flood Warnings in 2002
Flash Flood Warning 1, NWS Billings, MT
NWS Billings, MT issued this flash flood warning at Jul 17, 2002, 9:39 PM MDT for Big Horn 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 17, 2002, 9:39 PM MDT (03:39 UTC)
- Expired
- Jul 18, 2002, 3:30 AM MDT
- In force
- 6 hr
- Issued by
- NWS Billings, MT
- Area
- Whole counties
County Big Horn County, MT
The radar
The Billings radar (KBLX), 99 km from the middle of the area, began a volume at 03:38 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
Riverton, WY (KRIW), launched 00:00Z, 3.7 hours before the alert went out and 272 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
- 799 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 3088 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 79 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS55 KBYZ 180339 FFWBYZ MTC003-180930- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE BILLINGS MT 931 PM MDT WED JUL 17 2002 THE NATIONAL WEATHER SERVICE IN BILLINGS HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHEAST BIG HORN COUNTY IN SOUTH CENTRAL MONTANA * UNTIL 330 AM MDT * AT 931 PM MDT...DOPPLER RADAR ESTIMATED THAT 4 TO 5 INCHES OF RAIN HAD FALLEN OVER NORTHEASTERN BIG HORN COUNTY SINCE 600 PM. HEAVY RAIN IS EXPECTED TO CONTINUE UNTIL 1030 PM MDT. SMALL CREEKS AND STREAMS WILL RAPIDLY FLOOD IN THE WARNED AREA...POSSIBLY WASHING OUT ROADS AND FLOODING NEARBY LOW AREAS. ABSOLUTELY DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. $$ LAT...LON 4592 10730 4567 10704 4580 10690 4591 10713
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 17, 8:57 PM MDT, 42 minutes earlier.
Area forecast discussion, Jul 17, 8:57 PM MDT, 42 minutes before
SOUTH CENTRAL AND SOUTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
857 PM MDT WED JUL 17 2002
.SHORT TERM...VALID FOR THU...FRI...SAT...
UPDATE TO ZFP ONLY...MOIST MONSOONAL FLOW CONTINUING TO BRING
MOISTURE INTO MONTANA FROM MEXICO. SMALL DISTURBANCES IN THIS FLOW
RESPONSIBLE FOR THIS EVENINGS CONVECTION. HAVE HAD REPORTS OF SEVERE
WIND GUSTS OVER BIG HORN COUNTY...BUT MAIN FEATURE WITH THESE STORMS HAS
BEEN HEAVY RAINFALL DUE TO HIGH AVAILABLE MOISTURE AND SLOW MOVEMENT.
TEMP FORECAST LOOKS GOOD WITH LOWS VERY CLOSE TO LAST NIGHTS VALUES...
HAVE UPDATED POPS FOR CURRENT CONVECTION AND TO LEAVE SLIGHT CHANCE POPS
INTO THE SOUTHWEST ZONES WHERE META SHOWING SOME LINGERING VORTICITY.
OTHERWISE SHOULD SEE MAJORITY OF THE CONVECTION COME TO AN END BY 3 AM.
CHAMBERS
.LONG TERM...VALID FOR SUN...MON...TUE...WED...
FRIDAY NIGHT AND SATURDAY...SHORTWAVE TROUGH PUSHES THROUGH MONTANA
FRIDAY NIGHT WITH ASSOCIATED COOL FRONT AT SURFACE. WITH TRAJECTORY OF
ENERGY BEST SHOT FOR THUNDER APPEARS TO BE IN THE WEST. SATURDAY COOL
FRONT PUSHES INTO DAKOTAS BUT AVN DEVELOPING DECENT INSTABILITY OUT EAST
IN THE AFTERNOON AND EVENING. WILL TWEAK POPS FOR BOTH PERIODS
ACCORDINGLY.
WEST TO NORTHWEST UPPER FLOW DEVELOPS THROUGH THE
EXTENDED PERIOD. SOME DIFFERENCES ON AMPLITUDE AND POSITION OF UPPER
RIDGE OVER THE WEST. MRF MORE AMPLIFIED WITH RIDGE THUS PUTS MONTANA IN
MORE NORTHWEST UPPER FLOW...WHILE UKMET AND ECMWF KEEPING FLOW MORE
ZONAL. IN EITHER CASE TEMPS SHOULD BE NEAR SEASONAL AVERAGES AS HOT
DESERT AIRMASS IS CONFINED TO THE SOUTHWEST UNITED STATES. SHORTWAVE
ENERGY LOOKS TO STAY MAINLY TO THE NORTH OF THE AREA. AVN RUN SHOWING
COOL FRONT PASSAGE BOTH LATE SUNDAY AND TUESDAY...BUT FOR NOW WILL
CONTINUE WITH DRY FORECAST AS LITTLE UPPER LEVEL SUPPORT EVIDENT. JZ
THU FRI SAT SUN MON TUE WED
-----------------------------------------------------------
BIL 065/092 068/096 064/087 063/088 062/087 060/087 061/085
33/T 34/T 43/T 30/B 00/B 00/B 00/B
LVM 057/094 057/091 056/085 056/085 054/086 053/085 054/085
33/T 34/T 42/T 20/B 00/B 00/B 00/B
HDN 061/094 064/098 065/087 064/089 061/089 059/088 062/086
63/T 33/T 33/T 30/B 00/B 00/B 00/B
MLS 068/096 071/099 066/088 066/088 065/088 062/087 064/085
42/T 23/T 33/T 30/B 00/B 00/B 00/B
4BQ 066/096 069/098 065/088 065/089 063/089 061/087 062/086
43/T 33/T 33/T 30/B 00/B 00/B 00/B
BHK 064/092 067/097 064/085 065/086 063/087 059/085 060/083
22/T 23/T 33/T 30/B 00/B 00/B 00/B
SHR 064/093 067/096 059/087 060/088 058/088 059/087 059/087
33/T 33/T 33/T 30/B 00/B 00/B 00/B
.BYZ...
MT...NONE.
WY...NONE.The office that day
Everything else NWS Billings, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 8:11 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 59 min |
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.