Alert archive / North Dakota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 11, NWS Bismarck, ND
NWS Bismarck, ND issued this severe thunderstorm warning at May 21, 1999, 3:08 PM MDT for Bowman County, North Dakota. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 21, 1999, 3:08 PM MDT (21:08 UTC)
- Expired
- May 21, 1999, 3:45 PM MDT
- In force
- 37 min
- Issued by
- NWS Bismarck, ND
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Bowman County, ND
The radar
The Bismarck radar (KBIS), 224 km from the middle of the area, began a volume at 21:11 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 21, 2:00 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Rapid City, SD (KUNR), launched 12:00Z, 9.1 hours before the alert went out and 233 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1886 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- -39 m²/s²
- 0-3 km storm-relative helicity
- 21 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Bismarck, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at May 21, 2:40 PM MDT, 28 minutes earlier.
Area forecast discussion, May 21, 2:40 PM MDT, 28 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BISMARCK ND 340 PM CDT FRI MAY 21 1999 LINE OF TSTMS HAS ENTERED WRN ND. WATCH WAS ISSUED FOR SWRN AND PARTS OF S CNTRL ND BY SPC ALREADY. HAVE ISSUED ZONES EARLY RATHER THAN UPDATE OLD PACKAGE. MODELS IN FAIR AGREEMENT WITH POSITION OF FEATURES. SFC LOW IS IN WY/SD/SWRN ND/SERN MT AREA AND PROGGED TO APPROACH S CNTRL ND BY 06Z...AND BE NEAR JMS BY 12Z. SVR TSTMS THIS EVE...BUT SUSPECT SVR LEVELS WL NOT CONTINUE AFT MID IN ND. CHC TSTMS FROM BIS/MOT AND EAST ON SAT AS LIS BELOW ZERO...AND A VORT MAX MOVES IN FAST FROM THE WEST. WL KEEP CHC IN JMS SAT EVE AS SYSTEM PROGRESSES EAST. CLOUDY BUT DRY FOR SAT NIGHT AND SUN. MAY GET WINDIER THAN 10 TO 20 MPH...BUT MAY NOT HAPPEN UNTIL SAT NIGHT. EXTENDED STILL LOOKS DRY WITH TEMPS IN THE 70S...MAYBE 80S. .BIS...SVR TSTM WATCH UNTIL 0200Z SW AND S CNTRL (DIK...BIS...BOWMAN...FT YATES) VINING
The office that day
Everything else NWS Bismarck, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 3:04 PM MDT | Severe Thunderstorm Warning | BIS | McKenzie | 61 min |
| May 21, 5:25 PM MDT | Severe Thunderstorm Warning | BIS | Billings | 35 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 1999Every severe thunderstorm warning in 1999
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.