Alert archive / North Dakota / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 41, NWS Bismarck, ND

July 21, 1993Williams County, North Dakota

NWS Bismarck, ND issued this severe thunderstorm warning at Jul 21, 1993, 11:49 PM CDT for Williams County, North Dakota. It was in force for 56 min.

The area

The counties it named.

The facts

Issued
Jul 21, 1993, 11:49 PM CDT (04:49 UTC)
Expired
Jul 22, 1993, 12:45 AM CDT
In force
56 min
Issued by
NWS Bismarck, ND
Area
Whole counties

County Williams County, ND

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 4.8 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.

Skew-T log-pSkew-T log-p diagram, Bismarck Municip, ND at 00:00Z on 1993-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 59 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 00:00Z on 1993-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
59 J/kg
Mixed-layer CIN
-285 J/kg
Mixed-layer LCL
825 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
95 m²/s²
0-3 km storm-relative helicity
142 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

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, Jul 21, 8:12 PM CDT, 3 hours 37 minutes before
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Special weather statement, Jul 21, 9:18 PM CDT, 2 hours 31 minutes before
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Special weather statement, Jul 21, 10:37 PM CDT, 1 hour 12 minutes before
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Special weather statement, Jul 21, 10:48 PM CDT, 1 hour 1 minute before
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Special weather statement, Jul 21, 11:26 PM CDT, 23 minutes before
NDZ001>004-006>008-220515-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
1020 PM MDT WED JUL 21 1993

..STRONG THUNDERSTORMS CONTINUE TO MOVE ACROSS SOUTHWEST NORTH DAKOTA..
...A FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 6 AM MDT/7 AM CDT FOR
WESTERN AND SOUTH CENTRAL NORTH DAKOTA...

AT 1015 PM MDT WEATHER RADAR INDICATED A LARGE AREA OF THUNDERSTORMS
OVER SOUTHWEST NORTH DAKOTA MOVING NORTH NORTHEAST AT 20 MPH. THE
STRONGEST THUNDERSTORM WAS 25 MILES SOUTH OF DICKINSON...OR 5 MILES EAST
OF NEW ENGLAND. THIS STORM LIKELY CONTAINS PEA TO MARBLE SIZE HAIL...
DANGEROUS LIGHTNING...GUSTY WINDS...AND VERY HEAVY RAIN WHICH MAY CAUSE
LOCALIZED FLOODING.

PERSONS IN EASTERN HETTINGER AND EASTERN STARK COUNTIES SHOULD MOVE TO
A PLACE OF SAFETY SHOULD THREATENING WEATHER APPROACH.

REMEMBER...THE POTENTIAL FOR FLASH FLOODING IS HIGH TONIGHT. PERSONS
IN FLOOD PRONE AREAS SHOULD BE PREPARED TO MOVE TO HIGH GROUND SHOULD
FLOODING DEVELOP. DO NOT ATTEMPT TO DRIVE ACROSS FLOODED ROADS.

LEBLANG

The office that day

Everything else NWS Bismarck, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 21, 11:11 PM CDTSevere Thunderstorm WarningBISMcKenzie64 min
Jul 22, 12:43 AM CDTSevere Thunderstorm WarningBISDivide62 min
Jul 22, 12:50 AM CDTSevere Thunderstorm WarningBISGrant40 min
Jul 22, 3:03 AM CDTFlash Flood WarningBISMorton87 min
Jul 22, 6:25 PM CDTTornado WarningBISMcLean, Ward35 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 1993Every severe thunderstorm warning in 1993

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.