Wyoming, 2001

Flooding in Wyoming, June 4, 2001

June 4, 2001 · NWS UNR · 2 events in 2 counties and zones

Locally heavy rain produced minor flooding over rural areas of Crook and Weston Counties during the evening hours. Small streams rose out of their banks and 6 inches of standing water was reported on highways.

Where it happened

Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
2

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS UNR wrote it up.

Locally heavy rain produced minor flooding over rural areas of Crook and Weston Counties during the evening hours. Small streams rose out of their banks and 6 inches of standing water was reported on highways. By 8 pm MST the rain had tapered off, and by midnight, the streams had receded back within their banks.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Rapid City, SD wrote its last area forecast discussion before the first event at Jun 4, 2:00 PM MST, 3 hours 50 minutes earlier.

Area forecast discussion, Jun 4, 2:00 PM MST, 3 hours 50 minutes before
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY SD
300 PM MDT MON JUN 4 2001

LATEST SFC ANALYSIS PLACES LOW OVER CENT CO WITH AN INVERTED TROF
EXTENDING N THROUGH ERN WY. MUCH DRIER AIR NOTED BEHIND THIS TROF..
WITH A 20F DEW POINT CHANGE FM NE WY TO WRN WY. AREA RADARS INDC
BROAD AREA OF PRECIP ALONG AND E OF THIS TROF WHICH IS INCREASING
INTENSITY AND AREAL COVERAGE. IR IMAGES SHOW COOLING CLOUD TOPS FM
SE WY INTO SW SD. LIGHTNING ACTIVITY IS INCREASING OVER NEB
PANHANDLE.

MODELS INITIALIZED WELL AND SHOW PRETTY GOOD AGREEMENT OVER MUCH OF
U.S. CLOSED LOW OVER MT/WY CAN BE SEEN OPENING UP AND WEAKENING IN
WV IMAGES...AS PROGGED. OF COURSE SHOULD GET ONE LAST PUSH OF ROBUST
SYNOPTIC LIFT...MAINLY THIS EVENING...BEFORE THIS LOW FINALLY
WEAKENS AND SHEARS OUT AS UPPER FLOW BECOMES ZONAL. S/WV MOVING
AROUND THIS LOW IS RESPONSIBLE FOR A GOOD BIT OF PVA AND ISENTROPIC
LIFT OVER CWFA ATTM THROUGH THE EVE HOURS. WITH A SATURATED ATMO
THROUGH THE LOWEST 8KM...RAIN IS A SURE BET OVER THE NEXT FEW HOURS.
MODEST CAPE OVER CWFA...HOWEVER 500-1000 J/KG EXPECTED JUST S OF
CWFA. MILDLY STEEP LAPSE RATES OVER CWFA. OCCASIONAL WEAK
THUNDERSTORMS ARE POSSIBLE THIS EVE MAINLY WRN AND SRN MOST ZONES.
GOOD DRYING OVER CWFA FM W TO E AFT 03Z AS SFC TO 850 LAYER IS
FAIRLY DRY BEHIND TROF. SHOULD SEE NEARLY STEADY TEMPERATURES
THROUGH THE NIGHT...ONLY DIPPING A FEW DEGREES AFTER MIDNIGHT. THICK
MID AND HIGH CLOUD DECK AND COOLER/DRYER AIR MOVING OVER WET GROUND
WILL ALLOW PATCHY FOG TO DEVELOP. ATMO SLOWLY DRIES OVER NEXT COUPLE
DAYS. DEEPER MOISTURE REMAINS TO N AND E OF CWFA...AND SOME PRECIP
MAY BE SEEN THROUGH TUESDAY IN EXTREME NRN AND ERN ZONES. WILL
ANTICIPATE DRYING ATMO TUE...HOWEVER ROBUST EVAP OF PLENTIFUL GROUND
MOISTURE COMBINED WITH LINGERING MID LEVEL MOISTURE WILL ALLOW SOME
CU DEVELOP TUE AFTERNOON. THESE CLOUDS COMBINED WITH HIGH CLOUDS
WILL LIMIT HIGH TEMPS TUE. GUIDANCE POPS AND TEMPS LOOK REASONABLE
AND HAVE CHANGED VERY LITTLE...ONLY MAKING CHANGES PER ABOVE.

WED INTO EXTENDED PERIODS WILL SEE ZONAL FLOW GIVE WAY TO UPPER
LEVEL RIDGING OVER WRN U.S. RIDGE BUILD OVER ROCKIES THROUGH THE
WEEKEND WITH A FEW SHORTWAVES MOVING OVER THE RIDGE DAYS 5-7
SUPPORTING DIURNAL CONVECTION. TEMPS SHOULD WARM TO AROUND NORMAL OR
SLIGHTLY ABOVE. GUIDANCE HAS A GOOD HANDLE ON THIS AND HAVE N'T
CHANGED MUCH.

.UNR...NONE.
99

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

2 flood. Local standard time, as filed.

Flood, Crook

When
June 4, 5:50 PM MST to 11:59 PM MST
Where
Crook County, 10 mi SW of Aladdin
Reported by
LAW ENFORCEMENT
Coordinates
44.589, -104.570 (the zone’s center; the record gives no point)

Flood, Weston

When
June 4, 5:50 PM MST to 11:59 PM MST
Where
Weston County, Upton
Reported by
LAW ENFORCEMENT
Coordinates
43.841, -104.568 (the zone’s center; the record gives no point)

What these are

Flood
Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Wyoming in 2001Every state in 2001This day in weather historyWarnings in Wyoming, June 2001

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5253806, 5253807.