Alert archive / North Dakota / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 2, NWS Bismarck, ND
NWS Bismarck, ND issued this severe thunderstorm warning at May 11, 1986, 6:51 PM MDT for Grant County, Sioux County, North Dakota. It was in force for 30 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 11, 1986, 6:51 PM MDT (00:51 UTC)
- Expired
- May 11, 1986, 7:21 PM MDT
- In force
- 30 min
- Issued by
- NWS Bismarck, ND
- Area
- Whole counties
Counties Grant County, ND, Sioux County, ND
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 11, 7:15 PM MDT | Hail 2.75 | Sioux, ND | |
| May 11, 7:15 PM MDT | Hail 1.75 | Sioux, ND |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 00:00Z, 0.9 hours before the alert went out and 77 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
- 296 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 2338 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
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.
In the hours before
Special weather statement, May 11, 3:36 PM MDT, 3 hours 15 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BISMARCK ND 430 PM CDT SUN MAY 11 1986 AT 4 PM CDT OBSERVATIONS FROM THE DAKOTAS INDICATE THUNDERSTORM DEVELOPEMENT. A FEW OF THESE THUNDERSTORMS MAY BECOME SEVERE IN SOUTHCENTRAL AND EASTERN NORTH DAKOTA TONIGHT. A PACIFIC WEATHER FRONT WAS LOCATED LATE SUNDAY AFTERNOON IN EXTREME WESTERN NORTH DAKOTA. BY MIDNIGHT THE FRONT SHOULD MOVE EASTWARD INTO EASTERN NORTH DAKOTA. LATER S9TATEMENTS WILL BE ISSUED AS NEEDED. SEAL
Special weather statement, May 11, 4:57 PM MDT, 1 hour 54 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BISMARCK ND 555 PM CDT SUN MAY 11 1986 WIND GUSTS OF 52 MPH WERE REPORTED IN DEVILS LAKE NORTH DAKOTA AT 543 PM CDT. 1/4 INCH HAIL WAS ALSO REPORTED. THE THUNDERSTORM THAT PRODUCTED THE STRONG WIND WAS 1 OF MANY ALONG A LINE THAT STREACHED FROM THE CANADIAN BORDER NORTHEAST OF DEVILS LAKE TO THE SOUTH DAKOTA LINE SOUTHWEST OF BISMARCK NORTH DAKOTA. THE LINE OF THUNDERSTORMS WAS MOVING EASTWARD. LATER STATEMENTS WILL BE ISSUED AS NEEDED. SEAL
Special weather statement, May 11, 5:32 PM MDT, 1 hour 19 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BISMARCK ND 630 PM CDT SUN MAY 11 1986 REPORTS ARE NOW COMING INTO THE WEATHER STATION AT BISMARCK NORTH DAKOTA FROM SOUTHCENTRAL PORTIONS OF THE STATE. DURING THE PAST 1/2 HOUR..BETWEEN 500 PM MDT TO 530 PM MDT..THUNDERSTORMS DEVELOPED IN AND AROUND NEW LEIPZIG..ELGIN..AND BURT NORTH DAKOTA. THUSFAR THESE THUNDERSTORMS HAVE PRODUCTED VERY HEAVY RAIN..PEA SIZE HAIL.. AND NOT MUCH WIND. PEOPLE AT LAKE TSCHIDA SHOULD OBSERVE THESE THUNDERSTORMS AS THEY ARE MOVING TOWARD THE LAKE. LATER STATEMENTS WILL BE ISSUED AS NEEDED. SEAL
Special weather statement, May 11, 6:05 PM MDT, 46 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BISMARCK ND 705 PM CDT SUN MAY 11 1986 AT 700 PM CDT THUNDERSTORMS WITH VERY HEAVY RAIN..SMALL HAIL..AND GUSTY WIND CONTINUE TO MOVE NORTHEAST THROUGH SOUTHCENTRAL NORTH DAKOTA. SOME OF THESE THUNDERSTORMS WERE SOUTHWEST OF THE BISMARCK/MANDAN AREA AND CAN BE SEEN FROM THE CITIES. DURING THIS HOUR..BETWEEN 700 PM AND 800 PM CDT..THE THUNDERSTORMS WILL MOVE THROUGH AND NORTH OF THE BISMARCK/MANDAN AREA INTO CENTRAL NORTH DAKOTA. LATER STATEMENTS WILL BE ISSUED AS NEEDED. SEAL
Special weather statement, May 11, 6:44 PM MDT, 7 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BISMARCK ND 745 PM CDT SUN MAY 11 1986 AT 745 PM CDT THUNDERSTORMS WERE MOVING ALONG THE NORTHERN TIER OF SOUTH DAKOTA AND THE SOUTHERN TIER OF NORTH DAKOTA. WIND GUSTS TO 40 MPH WERE REPORTED AT BOWMAN NORTH DAKOTA. THE THUNDERSTORMS WERE MOVING NORTHEAST AT 25 TO 30 MPH AND COULD PRODUCE VERY HEAVY RAIN.. SMALL HAIL..AND GUSTY SURFACE WIND UP TO 50 MPH. LATER STATEMENTS WILL BE ISSUED AS NEEDED. SEAL
The office that day
Everything else NWS Bismarck, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 6:51 PM MDT | Severe Thunderstorm Warning | BIS | Emmons | 30 min |
| May 11, 7:36 PM MDT | Severe Thunderstorm Warning | BIS | Emmons, Sioux | 45 min |
| May 11, 8:37 PM MDT | Severe Thunderstorm Warning | BIS | Stutsman | 45 min |
| May 11, 8:45 PM MDT | Severe Thunderstorm Warning | BIS | McIntosh | 45 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 1986Every severe thunderstorm warning in 1986
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.